![\"\"](\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2021\/09\/mst.png\")
\u5171\u5305\u542b 208 \u9053\u9762\u8bd5\u9898\uff0c\u672c\u6587\u7684\u5b97\u65e8\u662f\u4e3a\u8bfb\u8005\u670b\u53cb\u4eec\u6574\u7406\u4e00\u4efd\u8be6\u5b9e\u800c\u53c8\u6743\u5a01\u7684\u9762\u8bd5\u6e05\u5355\uff0c\u4e0b\u9762\u4e00\u8d77\u8fdb\u5165\u4e3b\u9898\u5427\u3002<\/p>\n\n\n\n
Java \u57fa\u7840<\/h3>\n\n\n\n1. JDK \u548c JRE \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- JDK\uff1aJava Development Kit \u7684\u7b80\u79f0\uff0cJava \u5f00\u53d1\u5de5\u5177\u5305\uff0c\u63d0\u4f9b\u4e86 Java \u7684\u5f00\u53d1\u73af\u5883\u548c\u8fd0\u884c\u73af\u5883\u3002<\/li>
- JRE\uff1aJava Runtime Environment \u7684\u7b80\u79f0\uff0cJava \u8fd0\u884c\u73af\u5883\uff0c\u4e3a Java \u7684\u8fd0\u884c\u63d0\u4f9b\u4e86\u6240\u9700\u73af\u5883\u3002<\/li><\/ul>\n\n\n\n
\u5177\u4f53\u6765\u8bf4 JDK \u5176\u5b9e\u5305\u542b\u4e86 JRE\uff0c\u540c\u65f6\u8fd8\u5305\u542b\u4e86\u7f16\u8bd1 Java \u6e90\u7801\u7684\u7f16\u8bd1\u5668 Javac\uff0c\u8fd8\u5305\u542b\u4e86\u5f88\u591a Java \u7a0b\u5e8f\u8c03\u8bd5\u548c\u5206\u6790\u7684\u5de5\u5177\u3002\u7b80\u5355\u6765\u8bf4\uff1a\u5982\u679c\u4f60\u9700\u8981\u8fd0\u884c Java \u7a0b\u5e8f\uff0c\u53ea\u9700\u5b89\u88c5 JRE \u5c31\u53ef\u4ee5\u4e86\uff0c\u5982\u679c\u4f60\u9700\u8981\u7f16\u5199 Java \u7a0b\u5e8f\uff0c\u9700\u8981\u5b89\u88c5 JDK\u3002<\/p>\n\n\n\n
2. == \u548c equals \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
\u300c== \u89e3\u8bfb\u300d<\/strong><\/p>\n\n\n\n\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b == \u7684\u4f5c\u7528\u6548\u679c\u662f\u4e0d\u540c\u7684\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
- \u57fa\u672c\u7c7b\u578b\uff1a\u6bd4\u8f83\u7684\u662f\u503c\u662f\u5426\u76f8\u540c\uff1b<\/li>
- \u5f15\u7528\u7c7b\u578b\uff1a\u6bd4\u8f83\u7684\u662f\u5f15\u7528\u662f\u5426\u76f8\u540c\uff1b<\/li><\/ul>\n\n\n\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n\n\n\n
String x = \"string\";\nString y = \"string\";\nString z = new String(\"string\");\nSystem.out.println(x==y); \/\/ true\nSystem.out.println(x==z); \/\/ false\nSystem.out.println(x.equals(y)); \/\/ true\nSystem.out.println(x.equals(z)); \/\/ true<\/code><\/pre>\n\n\n\n\u4ee3\u7801\u89e3\u8bfb\uff1a\u56e0\u4e3a x \u548c y \u6307\u5411\u7684\u662f\u540c\u4e00\u4e2a\u5f15\u7528\uff0c\u6240\u4ee5 == \u4e5f\u662f true\uff0c\u800c new String()\u65b9\u6cd5\u5219\u91cd\u5199\u5f00\u8f9f\u4e86\u5185\u5b58\u7a7a\u95f4\uff0c\u6240\u4ee5 == \u7ed3\u679c\u4e3a false\uff0c\u800c equals \u6bd4\u8f83\u7684\u4e00\u76f4\u662f\u503c\uff0c\u6240\u4ee5\u7ed3\u679c\u90fd\u4e3a true\u3002<\/p>\n\n\n\n
\u300cequals \u89e3\u8bfb\u300d<\/strong><\/p>\n\n\n\nequals \u672c\u8d28\u4e0a\u5c31\u662f ==\uff0c\u53ea\u4e0d\u8fc7 String \u548c Integer \u7b49\u91cd\u5199\u4e86 equals \u65b9\u6cd5\uff0c\u628a\u5b83\u53d8\u6210\u4e86\u503c\u6bd4\u8f83\u3002\u770b\u4e0b\u9762\u7684\u4ee3\u7801\u5c31\u660e\u767d\u4e86\u3002<\/p>\n\n\n\n
\u9996\u5148\u6765\u770b\u9ed8\u8ba4\u60c5\u51b5\u4e0b equals \u6bd4\u8f83\u4e00\u4e2a\u6709\u76f8\u540c\u503c\u7684\u5bf9\u8c61\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
classCat{\n publicCat(String name){\n this.name = name;\n }\n\n private String name;\n\n public String getName(){\n return name;\n }\n\n publicvoidsetName(String name){\n this.name = name;\n }\n}\n\nCat c1 = new Cat(\"\u738b\u78ca\");\nCat c2 = new Cat(\"\u738b\u78ca\");\nSystem.out.println(c1.equals(c2)); \/\/ false<\/code><\/pre>\n\n\n\n\u8f93\u51fa\u7ed3\u679c\u51fa\u4e4e\u6211\u4eec\u7684\u610f\u6599\uff0c\u7adf\u7136\u662f false\uff1f\u8fd9\u662f\u600e\u4e48\u56de\u4e8b\uff0c\u770b\u4e86 equals \u6e90\u7801\u5c31\u77e5\u9053\u4e86\uff0c\u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
publicbooleanequals(Object obj){\n return (this == obj);\n}<\/code><\/pre>\n\n\n\n\u539f\u6765 equals \u672c\u8d28\u4e0a\u5c31\u662f ==\u3002<\/p>\n\n\n\n
\u90a3\u95ee\u9898\u6765\u4e86\uff0c\u4e24\u4e2a\u76f8\u540c\u503c\u7684 String \u5bf9\u8c61\uff0c\u4e3a\u4ec0\u4e48\u8fd4\u56de\u7684\u662f true\uff1f\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
String s1 = new String(\"\u8001\u738b\");\nString s2 = new String(\"\u8001\u738b\");\nSystem.out.println(s1.equals(s2)); \/\/ true<\/code><\/pre>\n\n\n\n\u540c\u6837\u7684\uff0c\u5f53\u6211\u4eec\u8fdb\u5165 String \u7684 equals \u65b9\u6cd5\uff0c\u627e\u5230\u4e86\u7b54\u6848\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
public boolean equals(Object anObject){\n if (this == anObject) {\n return true;\n }\n if (anObject instanceof String) {\n String anotherString = (String)anObject;\n int n = value.length;\n if (n == anotherString.value.length) {\n char v1[] = value;\n char v2[] = anotherString.value;\n int i = 0;\n while (n-- != 0) {\n if (v1[i] != v2[i])\n return false;\n i++;\n }\n return true;\n }\n }\n return false;\n}<\/code><\/pre>\n\n\n\n\u539f\u6765\u662f String \u91cd\u5199\u4e86 Object \u7684 equals \u65b9\u6cd5\uff0c\u628a\u5f15\u7528\u6bd4\u8f83\u6539\u6210\u4e86\u503c\u6bd4\u8f83\u3002<\/p>\n\n\n\n
\u300c\u603b\u7ed3\u300d<\/strong> \uff1a== \u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6765\u8bf4\u662f\u503c\u6bd4\u8f83\uff0c\u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\u6765\u8bf4\u662f\u6bd4\u8f83\u7684\u662f\u5f15\u7528\uff1b\u800c equals \u9ed8\u8ba4\u60c5\u51b5\u4e0b\u662f\u5f15\u7528\u6bd4\u8f83\uff0c\u53ea\u662f\u5f88\u591a\u7c7b\u91cd\u65b0\u4e86 equals \u65b9\u6cd5\uff0c\u6bd4\u5982 String\u3001Integer \u7b49\u628a\u5b83\u53d8\u6210\u4e86\u503c\u6bd4\u8f83\uff0c\u6240\u4ee5\u4e00\u822c\u60c5\u51b5\u4e0b equals \u6bd4\u8f83\u7684\u662f\u503c\u662f\u5426\u76f8\u7b49\u3002<\/p>\n\n\n\n3. \u4e24\u4e2a\u5bf9\u8c61\u7684 hashCode() \u76f8\u540c\uff0c\u5219 equals() \u4e5f\u4e00\u5b9a\u4e3a true\uff0c\u5bf9\u5417\uff1f<\/h4>\n\n\n\n
\u4e0d\u5bf9\uff0c\u4e24\u4e2a\u5bf9\u8c61\u7684 hashCode() \u76f8\u540c\uff0cequals() \u4e0d\u4e00\u5b9a true\u3002<\/p>\n\n\n\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n\n\n\n
String str1 = \"\u901a\u8bdd\";\nString str2 = \"\u91cd\u5730\";\nSystem. out. println(String. format(\"str1\uff1a%d | str2\uff1a%d\", str1. hashCode(),str2. hashCode()));\nSystem. out. println(str1. equals(str2));<\/code><\/pre>\n\n\n\n\u6267\u884c\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n
str1\uff1a1179395 | str2\uff1a1179395\n\nfalse<\/code><\/pre>\n\n\n\n\u4ee3\u7801\u89e3\u8bfb\uff1a\u5f88\u663e\u7136\u201c\u901a\u8bdd\u201d\u548c\u201c\u91cd\u5730\u201d\u7684 hashCode() \u76f8\u540c\uff0c\u7136\u800c equals() \u5219\u4e3a false\uff0c\u56e0\u4e3a\u5728\u6563\u5217\u8868\u4e2d\uff0chashCode() \u76f8\u7b49\u5373\u4e24\u4e2a\u952e\u503c\u5bf9\u7684\u54c8\u5e0c\u503c\u76f8\u7b49\uff0c\u7136\u800c\u54c8\u5e0c\u503c\u76f8\u7b49\uff0c\u5e76\u4e0d\u4e00\u5b9a\u80fd\u5f97\u51fa\u952e\u503c\u5bf9\u76f8\u7b49\u3002<\/p>\n\n\n\n
4. final \u5728 Java \u4e2d\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f<\/h4>\n\n\n\n- final \u4fee\u9970\u7684\u7c7b\u53eb\u6700\u7ec8\u7c7b\uff0c\u8be5\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\u3002<\/li>
- final \u4fee\u9970\u7684\u65b9\u6cd5\u4e0d\u80fd\u88ab\u91cd\u5199\u3002<\/li>
- final \u4fee\u9970\u7684\u53d8\u91cf\u53eb\u5e38\u91cf\uff0c\u5e38\u91cf\u5fc5\u987b\u521d\u59cb\u5316\uff0c\u521d\u59cb\u5316\u4e4b\u540e\u503c\u5c31\u4e0d\u80fd\u88ab\u4fee\u6539\u3002<\/li><\/ul>\n\n\n\n
5. Java \u4e2d\u7684 Math. round(-1. 5) \u7b49\u4e8e\u591a\u5c11\uff1f<\/h4>\n\n\n\n
\u7b49\u4e8e -1\uff0c\u56e0\u4e3a\u5728\u6570\u8f74\u4e0a\u53d6\u503c\u65f6\uff0c\u4e2d\u95f4\u503c\uff080.5\uff09\u5411\u53f3\u53d6\u6574\uff0c\u6240\u4ee5\u6b63 0.5 \u662f\u5f80\u4e0a\u53d6\u6574\uff0c\u8d1f 0.5 \u662f\u76f4\u63a5\u820d\u5f03\u3002<\/p>\n\n\n\n
6. String \u5c5e\u4e8e\u57fa\u7840\u7684\u6570\u636e\u7c7b\u578b\u5417\uff1f<\/h4>\n\n\n\n
String \u4e0d\u5c5e\u4e8e\u57fa\u7840\u7c7b\u578b\uff0c\u57fa\u7840\u7c7b\u578b\u6709 8 \u79cd\uff1abyte\u3001boolean\u3001char\u3001short\u3001int\u3001float\u3001long\u3001double\uff0c\u800c String \u5c5e\u4e8e\u5bf9\u8c61\u3002<\/p>\n\n\n\n
7. Java \u4e2d\u64cd\u4f5c\u5b57\u7b26\u4e32\u90fd\u6709\u54ea\u4e9b\u7c7b\uff1f\u5b83\u4eec\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
\u64cd\u4f5c\u5b57\u7b26\u4e32\u7684\u7c7b\u6709\uff1aString\u3001StringBuffer\u3001StringBuilder\u3002<\/p>\n\n\n\n
String \u548c StringBuffer\u3001StringBuilder \u7684\u533a\u522b\u5728\u4e8e String \u58f0\u660e\u7684\u662f\u4e0d\u53ef\u53d8\u7684\u5bf9\u8c61\uff0c\u6bcf\u6b21\u64cd\u4f5c\u90fd\u4f1a\u751f\u6210\u65b0\u7684 String \u5bf9\u8c61\uff0c\u7136\u540e\u5c06\u6307\u9488\u6307\u5411\u65b0\u7684 String \u5bf9\u8c61\uff0c\u800c StringBuffer\u3001StringBuilder \u53ef\u4ee5\u5728\u539f\u6709\u5bf9\u8c61\u7684\u57fa\u7840\u4e0a\u8fdb\u884c\u64cd\u4f5c\uff0c\u6240\u4ee5\u5728\u7ecf\u5e38\u6539\u53d8\u5b57\u7b26\u4e32\u5185\u5bb9\u7684\u60c5\u51b5\u4e0b\u6700\u597d\u4e0d\u8981\u4f7f\u7528 String\u3002<\/p>\n\n\n\n
StringBuffer \u548c StringBuilder \u6700\u5927\u7684\u533a\u522b\u5728\u4e8e\uff0cStringBuffer \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800c StringBuilder \u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4f46 StringBuilder \u7684\u6027\u80fd\u5374\u9ad8\u4e8e StringBuffer\uff0c\u6240\u4ee5\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u63a8\u8350\u4f7f\u7528 StringBuilder\uff0c\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u63a8\u8350\u4f7f\u7528 StringBuffer\u3002<\/p>\n\n\n\n
8. String str=”i”\u4e0e String str=new String(“i”)\u4e00\u6837\u5417\uff1f<\/h4>\n\n\n\n
\u4e0d\u4e00\u6837\uff0c\u56e0\u4e3a\u5185\u5b58\u7684\u5206\u914d\u65b9\u5f0f\u4e0d\u4e00\u6837\u3002String str=”i”\u7684\u65b9\u5f0f\uff0cJava \u865a\u62df\u673a\u4f1a\u5c06\u5176\u5206\u914d\u5230\u5e38\u91cf\u6c60\u4e2d\uff1b\u800c String str=new String(“i”) \u5219\u4f1a\u88ab\u5206\u5230\u5806\u5185\u5b58\u4e2d\u3002<\/p>\n\n\n\n
9. \u5982\u4f55\u5c06\u5b57\u7b26\u4e32\u53cd\u8f6c\uff1f<\/h4>\n\n\n\n
\u4f7f\u7528 StringBuilder \u6216\u8005 stringBuffer \u7684 reverse() \u65b9\u6cd5\u3002<\/p>\n\n\n\n
\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
\/\/ StringBuffer reverse\nStringBuffer stringBuffer = new StringBuffer();\nstringBuffer.append(\"abcdefg\");\nSystem.out.println(stringBuffer.reverse()); \/\/ gfedcba\n\/\/ StringBuilder reverse\nStringBuilder stringBuilder = new StringBuilder();\nstringBuilder.append(\"abcdefg\");\nSystem.out.println(stringBuilder.reverse()); \/\/ gfedcba<\/code><\/pre>\n\n\n\n10. String \u7c7b\u7684\u5e38\u7528\u65b9\u6cd5\u90fd\u6709\u90a3\u4e9b\uff1f<\/h4>\n\n\n\n- indexOf()\uff1a\u8fd4\u56de\u6307\u5b9a\u5b57\u7b26\u7684\u7d22\u5f15\u3002<\/li>
- charAt()\uff1a\u8fd4\u56de\u6307\u5b9a\u7d22\u5f15\u5904\u7684\u5b57\u7b26\u3002<\/li>
- replace()\uff1a\u5b57\u7b26\u4e32\u66ff\u6362\u3002<\/li>
- trim()\uff1a\u53bb\u9664\u5b57\u7b26\u4e32\u4e24\u7aef\u7a7a\u767d\u3002<\/li>
- split()\uff1a\u5206\u5272\u5b57\u7b26\u4e32\uff0c\u8fd4\u56de\u4e00\u4e2a\u5206\u5272\u540e\u7684\u5b57\u7b26\u4e32\u6570\u7ec4\u3002<\/li>
- getBytes()\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u7684 byte \u7c7b\u578b\u6570\u7ec4\u3002<\/li>
- length()\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u957f\u5ea6\u3002<\/li>
- toLowerCase()\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6210\u5c0f\u5199\u5b57\u6bcd\u3002<\/li>
- toUpperCase()\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6210\u5927\u5199\u5b57\u7b26\u3002<\/li>
- substring()\uff1a\u622a\u53d6\u5b57\u7b26\u4e32\u3002<\/li>
- equals()\uff1a\u5b57\u7b26\u4e32\u6bd4\u8f83\u3002<\/li><\/ul>\n\n\n\n
11. \u62bd\u8c61\u7c7b\u5fc5\u987b\u8981\u6709\u62bd\u8c61\u65b9\u6cd5\u5417\uff1f<\/h4>\n\n\n\n
\u4e0d\u9700\u8981\uff0c\u62bd\u8c61\u7c7b\u4e0d\u4e00\u5b9a\u975e\u8981\u6709\u62bd\u8c61\u65b9\u6cd5\u3002<\/p>\n\n\n\n
\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
abstract classCat{\n publicstaticvoidsayHi(){\n System. out. println(\"hi~\");\n }\n}<\/code><\/pre>\n\n\n\n\u4e0a\u9762\u4ee3\u7801\uff0c\u62bd\u8c61\u7c7b\u5e76\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\u4f46\u5b8c\u5168\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n\n\n\n
12. \u666e\u901a\u7c7b\u548c\u62bd\u8c61\u7c7b\u6709\u54ea\u4e9b\u533a\u522b\uff1f<\/h4>\n\n\n\n- \u666e\u901a\u7c7b\u4e0d\u80fd\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\uff0c\u62bd\u8c61\u7c7b\u53ef\u4ee5\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\u3002<\/li>
- \u62bd\u8c61\u7c7b\u4e0d\u80fd\u76f4\u63a5\u5b9e\u4f8b\u5316\uff0c\u666e\u901a\u7c7b\u53ef\u4ee5\u76f4\u63a5\u5b9e\u4f8b\u5316\u3002<\/li><\/ul>\n\n\n\n
13. \u62bd\u8c61\u7c7b\u80fd\u4f7f\u7528 final \u4fee\u9970\u5417\uff1f<\/h4>\n\n\n\n
\u4e0d\u80fd\uff0c\u5b9a\u4e49\u62bd\u8c61\u7c7b\u5c31\u662f\u8ba9\u5176\u4ed6\u7c7b\u7ee7\u627f\u7684\uff0c\u5982\u679c\u5b9a\u4e49\u4e3a final \u8be5\u7c7b\u5c31\u4e0d\u80fd\u88ab\u7ee7\u627f\uff0c\u8fd9\u6837\u5f7c\u6b64\u5c31\u4f1a\u4ea7\u751f\u77db\u76fe\uff0c\u6240\u4ee5 final \u4e0d\u80fd\u4fee\u9970\u62bd\u8c61\u7c7b\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u7f16\u8f91\u5668\u4e5f\u4f1a\u63d0\u793a\u9519\u8bef\u4fe1\u606f\uff1a<\/p>\n\n\n\n
![\"\"](\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2021\/09\/final.png\")
final\u9762\u8bd5\u9898<\/figcaption><\/figure><\/div>\n\n\n\n14. \u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- \u5b9e\u73b0\uff1a\u62bd\u8c61\u7c7b\u7684\u5b50\u7c7b\u4f7f\u7528 extends \u6765\u7ee7\u627f\uff1b\u63a5\u53e3\u5fc5\u987b\u4f7f\u7528 implements \u6765\u5b9e\u73b0\u63a5\u53e3\u3002<\/li>
- \u6784\u9020\u51fd\u6570\uff1a\u62bd\u8c61\u7c7b\u53ef\u4ee5\u6709\u6784\u9020\u51fd\u6570\uff1b\u63a5\u53e3\u4e0d\u80fd\u6709\u3002<\/li>
- \u5b9e\u73b0\u6570\u91cf\uff1a\u7c7b\u53ef\u4ee5\u5b9e\u73b0\u5f88\u591a\u4e2a\u63a5\u53e3\uff1b\u4f46\u662f\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u62bd\u8c61\u7c7b\u3002<\/li>
- \u8bbf\u95ee\u4fee\u9970\u7b26\uff1a\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u9ed8\u8ba4\u4f7f\u7528 public \u4fee\u9970\uff1b\u62bd\u8c61\u7c7b\u4e2d\u7684\u65b9\u6cd5\u53ef\u4ee5\u662f\u4efb\u610f\u8bbf\u95ee\u4fee\u9970\u7b26\u3002<\/li><\/ul>\n\n\n\n
15. Java \u4e2d IO \u6d41\u5206\u4e3a\u51e0\u79cd\uff1f<\/h4>\n\n\n\n
\u6309\u529f\u80fd\u6765\u5206\uff1a\u8f93\u5165\u6d41\uff08input\uff09\u3001\u8f93\u51fa\u6d41\uff08output\uff09\u3002<\/p>\n\n\n\n
\u6309\u7c7b\u578b\u6765\u5206\uff1a\u5b57\u8282\u6d41\u548c\u5b57\u7b26\u6d41\u3002<\/p>\n\n\n\n
\u5b57\u8282\u6d41\u548c\u5b57\u7b26\u6d41\u7684\u533a\u522b\u662f\uff1a\u5b57\u8282\u6d41\u6309 8 \u4f4d\u4f20\u8f93\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u8f93\u5165\u8f93\u51fa\u6570\u636e\uff0c\u5b57\u7b26\u6d41\u6309 16 \u4f4d\u4f20\u8f93\u4ee5\u5b57\u7b26\u4e3a\u5355\u4f4d\u8f93\u5165\u8f93\u51fa\u6570\u636e\u3002<\/p>\n\n\n\n
16. BIO\u3001NIO\u3001AIO \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- BIO\uff1aBlock IO \u540c\u6b65\u963b\u585e\u5f0f IO\uff0c\u5c31\u662f\u6211\u4eec\u5e73\u5e38\u4f7f\u7528\u7684\u4f20\u7edf IO\uff0c\u5b83\u7684\u7279\u70b9\u662f\u6a21\u5f0f\u7b80\u5355\u4f7f\u7528\u65b9\u4fbf\uff0c\u5e76\u53d1\u5904\u7406\u80fd\u529b\u4f4e\u3002<\/li>
- NIO\uff1aNon IO \u540c\u6b65\u975e\u963b\u585e IO\uff0c\u662f\u4f20\u7edf IO \u7684\u5347\u7ea7\uff0c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u901a\u8fc7 Channel\uff08\u901a\u9053\uff09\u901a\u8baf\uff0c\u5b9e\u73b0\u4e86\u591a\u8def\u590d\u7528\u3002<\/li>
- AIO\uff1aAsynchronous IO \u662f NIO \u7684\u5347\u7ea7\uff0c\u4e5f\u53eb NIO2\uff0c\u5b9e\u73b0\u4e86\u5f02\u6b65\u975e\u5835\u585e IO \uff0c\u5f02\u6b65 IO \u7684\u64cd\u4f5c\u57fa\u4e8e\u4e8b\u4ef6\u548c\u56de\u8c03\u673a\u5236\u3002<\/li><\/ul>\n\n\n\n
17. Files\u7684\u5e38\u7528\u65b9\u6cd5\u90fd\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n- Files. exists()\uff1a\u68c0\u6d4b\u6587\u4ef6\u8def\u5f84\u662f\u5426\u5b58\u5728\u3002<\/li>
- Files. createFile()\uff1a\u521b\u5efa\u6587\u4ef6\u3002<\/li>
- Files. createDirectory()\uff1a\u521b\u5efa\u6587\u4ef6\u5939\u3002<\/li>
- Files. delete()\uff1a\u5220\u9664\u4e00\u4e2a\u6587\u4ef6\u6216\u76ee\u5f55\u3002<\/li>
- Files. copy()\uff1a\u590d\u5236\u6587\u4ef6\u3002<\/li>
- Files. move()\uff1a\u79fb\u52a8\u6587\u4ef6\u3002<\/li>
- Files. size()\uff1a\u67e5\u770b\u6587\u4ef6\u4e2a\u6570\u3002<\/li>
- Files. read()\uff1a\u8bfb\u53d6\u6587\u4ef6\u3002<\/li>
- Files. write()\uff1a\u5199\u5165\u6587\u4ef6\u3002<\/li><\/ul>\n\n\n\n
\u5bb9\u5668<\/h3>\n\n\n\n18. Java \u5bb9\u5668\u90fd\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n
Java \u5bb9\u5668\u5206\u4e3a Collection \u548c Map \u4e24\u5927\u7c7b\uff0c\u5176\u4e0b\u53c8\u6709\u5f88\u591a\u5b50\u7c7b\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
- Collection<\/li>
- List\n
- ArrayList<\/li>
- LinkedList<\/li>
- Vector<\/li>
- Stack<\/li><\/ul>\n<\/li>
- Set\n
- HashSet<\/li>
- LinkedHashSet<\/li>
- TreeSet<\/li><\/ul>\n<\/li>
- Map<\/li>
- HashMap\n
- LinkedHashMap<\/li><\/ul>\n<\/li>
- TreeMap<\/li>
- ConcurrentHashMap<\/li>
- Hashtable<\/li><\/ul>\n\n\n\n
19. Collection \u548c Collections \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- Collection \u662f\u4e00\u4e2a\u96c6\u5408\u63a5\u53e3\uff0c\u5b83\u63d0\u4f9b\u4e86\u5bf9\u96c6\u5408\u5bf9\u8c61\u8fdb\u884c\u57fa\u672c\u64cd\u4f5c\u7684\u901a\u7528\u63a5\u53e3\u65b9\u6cd5\uff0c\u6240\u6709\u96c6\u5408\u90fd\u662f\u5b83\u7684\u5b50\u7c7b\uff0c\u6bd4\u5982 List\u3001Set \u7b49\u3002<\/li>
- Collections \u662f\u4e00\u4e2a\u5305\u88c5\u7c7b\uff0c\u5305\u542b\u4e86\u5f88\u591a\u9759\u6001\u65b9\u6cd5\uff0c\u4e0d\u80fd\u88ab\u5b9e\u4f8b\u5316\uff0c\u5c31\u50cf\u4e00\u4e2a\u5de5\u5177\u7c7b\uff0c\u6bd4\u5982\u63d0\u4f9b\u7684\u6392\u5e8f\u65b9\u6cd5\uff1a Collections. sort(list)\u3002<\/li><\/ul>\n\n\n\n
20. List\u3001Set\u3001Map \u4e4b\u95f4\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
List\u3001Set\u3001Map \u7684\u533a\u522b\u4e3b\u8981\u4f53\u73b0\u5728\u4e24\u4e2a\u65b9\u9762\uff1a\u5143\u7d20\u662f\u5426\u6709\u5e8f\u3001\u662f\u5426\u5141\u8bb8\u5143\u7d20\u91cd\u590d\u3002<\/p>\n\n\n\n
\u4e09\u8005\u4e4b\u95f4\u7684\u533a\u522b\uff0c\u5982\u4e0b\u8868\uff1a<\/p>\n\n\n\n
![\"\"](\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2021\/09\/list-set-map.png\")
List\u3001Set\u3001Map \u7684\u533a\u522b<\/figcaption><\/figure><\/div>\n\n\n\n21. HashMap \u548c Hashtable \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- \u5b58\u50a8\uff1aHashMap \u8fd0\u884c key \u548c value \u4e3a null\uff0c\u800c Hashtable \u4e0d\u5141\u8bb8\u3002<\/li>
- \u7ebf\u7a0b\u5b89\u5168\uff1aHashtable \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800c HashMap \u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/li>
- \u63a8\u8350\u4f7f\u7528\uff1a\u5728 Hashtable \u7684\u7c7b\u6ce8\u91ca\u53ef\u4ee5\u770b\u5230\uff0cHashtable \u662f\u4fdd\u7559\u7c7b\u4e0d\u5efa\u8bae\u4f7f\u7528\uff0c\u63a8\u8350\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u4f7f\u7528 HashMap \u66ff\u4ee3\uff0c\u5982\u679c\u9700\u8981\u591a\u7ebf\u7a0b\u4f7f\u7528\u5219\u7528 ConcurrentHashMap \u66ff\u4ee3\u3002<\/li><\/ul>\n\n\n\n
22. \u5982\u4f55\u51b3\u5b9a\u4f7f\u7528 HashMap \u8fd8\u662f TreeMap\uff1f<\/h4>\n\n\n\n
\u5bf9\u4e8e\u5728 Map \u4e2d\u63d2\u5165\u3001\u5220\u9664\u3001\u5b9a\u4f4d\u4e00\u4e2a\u5143\u7d20\u8fd9\u7c7b\u64cd\u4f5c\uff0cHashMap \u662f\u6700\u597d\u7684\u9009\u62e9\uff0c\u56e0\u4e3a\u76f8\u5bf9\u800c\u8a00 HashMap \u7684\u63d2\u5165\u4f1a\u66f4\u5feb\uff0c\u4f46\u5982\u679c\u4f60\u8981\u5bf9\u4e00\u4e2a key \u96c6\u5408\u8fdb\u884c\u6709\u5e8f\u7684\u904d\u5386\uff0c\u90a3 TreeMap \u662f\u66f4\u597d\u7684\u9009\u62e9\u3002<\/p>\n\n\n\n
23. \u8bf4\u4e00\u4e0b HashMap \u7684\u5b9e\u73b0\u539f\u7406\uff1f<\/h4>\n\n\n\n
HashMap \u57fa\u4e8e Hash \u7b97\u6cd5\u5b9e\u73b0\u7684\uff0c\u6211\u4eec\u901a\u8fc7 put(key,value)\u5b58\u50a8\uff0cget(key)\u6765\u83b7\u53d6\u3002\u5f53\u4f20\u5165 key \u65f6\uff0cHashMap \u4f1a\u6839\u636e key. hashCode() \u8ba1\u7b97\u51fa hash \u503c\uff0c\u6839\u636e hash \u503c\u5c06 value \u4fdd\u5b58\u5728 bucket \u91cc\u3002\u5f53\u8ba1\u7b97\u51fa\u7684 hash \u503c\u76f8\u540c\u65f6\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a hash \u51b2\u7a81\uff0cHashMap \u7684\u505a\u6cd5\u662f\u7528\u94fe\u8868\u548c\u7ea2\u9ed1\u6811\u5b58\u50a8\u76f8\u540c hash \u503c\u7684 value\u3002\u5f53 hash \u51b2\u7a81\u7684\u4e2a\u6570\u6bd4\u8f83\u5c11\u65f6\uff0c\u4f7f\u7528\u94fe\u8868\u5426\u5219\u4f7f\u7528\u7ea2\u9ed1\u6811\u3002<\/p>\n\n\n\n
24. \u8bf4\u4e00\u4e0b HashSet \u7684\u5b9e\u73b0\u539f\u7406\uff1f<\/h4>\n\n\n\n
HashSet \u662f\u57fa\u4e8e HashMap \u5b9e\u73b0\u7684\uff0cHashSet \u5e95\u5c42\u4f7f\u7528 HashMap \u6765\u4fdd\u5b58\u6240\u6709\u5143\u7d20\uff0c\u56e0\u6b64 HashSet \u7684\u5b9e\u73b0\u6bd4\u8f83\u7b80\u5355\uff0c\u76f8\u5173 HashSet \u7684\u64cd\u4f5c\uff0c\u57fa\u672c\u4e0a\u90fd\u662f\u76f4\u63a5\u8c03\u7528\u5e95\u5c42 HashMap \u7684\u76f8\u5173\u65b9\u6cd5\u6765\u5b8c\u6210\uff0cHashSet \u4e0d\u5141\u8bb8\u91cd\u590d\u7684\u503c\u3002<\/p>\n\n\n\n
25. ArrayList \u548c LinkedList \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n- \u6570\u636e\u7ed3\u6784\u5b9e\u73b0\uff1aArrayList \u662f\u52a8\u6001\u6570\u7ec4\u7684\u6570\u636e\u7ed3\u6784\u5b9e\u73b0\uff0c\u800c LinkedList \u662f\u53cc\u5411\u94fe\u8868\u7684\u6570\u636e\u7ed3\u6784\u5b9e\u73b0\u3002<\/li>
- \u968f\u673a\u8bbf\u95ee\u6548\u7387\uff1aArrayList \u6bd4 LinkedList \u5728\u968f\u673a\u8bbf\u95ee\u7684\u65f6\u5019\u6548\u7387\u8981\u9ad8\uff0c\u56e0\u4e3a LinkedList \u662f\u7ebf\u6027\u7684\u6570\u636e\u5b58\u50a8\u65b9\u5f0f\uff0c\u6240\u4ee5\u9700\u8981\u79fb\u52a8\u6307\u9488\u4ece\u524d\u5f80\u540e\u4f9d\u6b21\u67e5\u627e\u3002<\/li>
- \u589e\u52a0\u548c\u5220\u9664\u6548\u7387\uff1a\u5728\u975e\u9996\u5c3e\u7684\u589e\u52a0\u548c\u5220\u9664\u64cd\u4f5c\uff0cLinkedList \u8981\u6bd4 ArrayList \u6548\u7387\u8981\u9ad8\uff0c\u56e0\u4e3a ArrayList \u589e\u5220\u64cd\u4f5c\u8981\u5f71\u54cd\u6570\u7ec4\u5185\u7684\u5176\u4ed6\u6570\u636e\u7684\u4e0b\u6807\u3002<\/li><\/ul>\n\n\n\n
\u7efc\u5408\u6765\u8bf4\uff0c\u5728\u9700\u8981\u9891\u7e41\u8bfb\u53d6\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u65f6\uff0c\u66f4\u63a8\u8350\u4f7f\u7528 ArrayList\uff0c\u800c\u5728\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u8f83\u591a\u65f6\uff0c\u66f4\u63a8\u8350\u4f7f\u7528 LinkedList\u3002<\/p>\n\n\n\n
26. \u5982\u4f55\u5b9e\u73b0\u6570\u7ec4\u548c List \u4e4b\u95f4\u7684\u8f6c\u6362\uff1f<\/h4>\n\n\n\n- \u6570\u7ec4\u8f6c List\uff1a\u4f7f\u7528 Arrays. asList(array) \u8fdb\u884c\u8f6c\u6362\u3002<\/li>
- List \u8f6c\u6570\u7ec4\uff1a\u4f7f\u7528 List \u81ea\u5e26\u7684 toArray() \u65b9\u6cd5\u3002<\/li><\/ul>\n\n\n\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n\n\n\n
\/\/ list to array\nList<String> list = new ArrayList<String>();\nlist. add(\"\u4e1a\u4f59\u8349\");\nlist. add(\"\u7684\u535a\u5ba2\");\nlist. toArray();\n\/\/ array to list\nString[] array = new String[]{\"\u4e1a\u4f59\u8349\",\"\u7684\u535a\u5ba2\"};\nArrays. asList(array);<\/code><\/pre>\n\n\n\n27. ArrayList \u548c Vector \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n- \u7ebf\u7a0b\u5b89\u5168\uff1aVector \u4f7f\u7528\u4e86 Synchronized \u6765\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65\uff0c\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800c ArrayList \u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/li>
- \u6027\u80fd\uff1aArrayList \u5728\u6027\u80fd\u65b9\u9762\u8981\u4f18\u4e8e Vector\u3002<\/li>
- \u6269\u5bb9\uff1aArrayList \u548c Vector \u90fd\u4f1a\u6839\u636e\u5b9e\u9645\u7684\u9700\u8981\u52a8\u6001\u7684\u8c03\u6574\u5bb9\u91cf\uff0c\u53ea\u4e0d\u8fc7\u5728 Vector \u6269\u5bb9\u6bcf\u6b21\u4f1a\u589e\u52a0 1 \u500d\uff0c\u800c ArrayList \u53ea\u4f1a\u589e\u52a0 50%\u3002<\/li><\/ul>\n\n\n\n
28. Array \u548c ArrayList \u6709\u4f55\u533a\u522b\uff1f<\/h4>\n\n\n\n- Array \u53ef\u4ee5\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u5bf9\u8c61\uff0cArrayList \u53ea\u80fd\u5b58\u50a8\u5bf9\u8c61\u3002<\/li>
- Array \u662f\u6307\u5b9a\u56fa\u5b9a\u5927\u5c0f\u7684\uff0c\u800c ArrayList \u5927\u5c0f\u662f\u81ea\u52a8\u6269\u5c55\u7684\u3002<\/li>
- Array \u5185\u7f6e\u65b9\u6cd5\u6ca1\u6709 ArrayList \u591a\uff0c\u6bd4\u5982 addAll\u3001removeAll\u3001iteration \u7b49\u65b9\u6cd5\u53ea\u6709 ArrayList \u6709\u3002<\/li><\/ul>\n\n\n\n
29. \u5728 Queue \u4e2d poll()\u548c remove()\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- \u76f8\u540c\u70b9\uff1a\u90fd\u662f\u8fd4\u56de\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c\u5e76\u5728\u961f\u5217\u4e2d\u5220\u9664\u8fd4\u56de\u7684\u5bf9\u8c61\u3002<\/li>
- \u4e0d\u540c\u70b9\uff1a\u5982\u679c\u6ca1\u6709\u5143\u7d20 poll()\u4f1a\u8fd4\u56de null\uff0c\u800c remove()\u4f1a\u76f4\u63a5\u629b\u51fa NoSuchElementException \u5f02\u5e38\u3002<\/li><\/ul>\n\n\n\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n\n\n\n
Queue<String> queue = new LinkedList<String>();\nqueue. offer(\"string\"); \/\/ add\nSystem. out. println(queue. poll());\nSystem. out. println(queue. remove());\nSystem. out. println(queue. size());<\/code><\/pre>\n\n\n\n30. \u54ea\u4e9b\u96c6\u5408\u7c7b\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff1f<\/h4>\n\n\n\n
Vector\u3001Hashtable\u3001Stack \u90fd\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800c\u50cf HashMap \u5219\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4e0d\u8fc7\u5728 JDK 1.5 \u4e4b\u540e\u968f\u7740 Java. util. concurrent \u5e76\u53d1\u5305\u7684\u51fa\u73b0\uff0c\u5b83\u4eec\u4e5f\u6709\u4e86\u81ea\u5df1\u5bf9\u5e94\u7684\u7ebf\u7a0b\u5b89\u5168\u7c7b\uff0c\u6bd4\u5982 HashMap \u5bf9\u5e94\u7684\u7ebf\u7a0b\u5b89\u5168\u7c7b\u5c31\u662f ConcurrentHashMap\u3002<\/p>\n\n\n\n
31. \u8fed\u4ee3\u5668 Iterator \u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
Iterator \u63a5\u53e3\u63d0\u4f9b\u904d\u5386\u4efb\u4f55 Collection \u7684\u63a5\u53e3\u3002\u6211\u4eec\u53ef\u4ee5\u4ece\u4e00\u4e2a Collection \u4e2d\u4f7f\u7528\u8fed\u4ee3\u5668\u65b9\u6cd5\u6765\u83b7\u53d6\u8fed\u4ee3\u5668\u5b9e\u4f8b\u3002\u8fed\u4ee3\u5668\u53d6\u4ee3\u4e86 Java \u96c6\u5408\u6846\u67b6\u4e2d\u7684 Enumeration\uff0c\u8fed\u4ee3\u5668\u5141\u8bb8\u8c03\u7528\u8005\u5728\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u79fb\u9664\u5143\u7d20\u3002<\/p>\n\n\n\n
32. Iterator \u600e\u4e48\u4f7f\u7528\uff1f\u6709\u4ec0\u4e48\u7279\u70b9\uff1f<\/h4>\n\n\n\n
Iterator \u4f7f\u7528\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
List<String> list = new ArrayList<>();\nIterator<String> it = list. iterator();\nwhile(it. hasNext()){\n String obj = it. next();\n System. out. println(obj);\n}<\/code><\/pre>\n\n\n\nIterator \u7684\u7279\u70b9\u662f\u66f4\u52a0\u5b89\u5168\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u786e\u4fdd\uff0c\u5728\u5f53\u524d\u904d\u5386\u7684\u96c6\u5408\u5143\u7d20\u88ab\u66f4\u6539\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u629b\u51fa ConcurrentModificationException \u5f02\u5e38\u3002<\/p>\n\n\n\n
33. Iterator \u548c ListIterator \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- Iterator \u53ef\u4ee5\u904d\u5386 Set \u548c List \u96c6\u5408\uff0c\u800c ListIterator \u53ea\u80fd\u904d\u5386 List\u3002<\/li>
- Iterator \u53ea\u80fd\u5355\u5411\u904d\u5386\uff0c\u800c ListIterator \u53ef\u4ee5\u53cc\u5411\u904d\u5386\uff08\u5411\u524d\/\u540e\u904d\u5386\uff09\u3002<\/li>
- ListIterator \u4ece Iterator \u63a5\u53e3\u7ee7\u627f\uff0c\u7136\u540e\u6dfb\u52a0\u4e86\u4e00\u4e9b\u989d\u5916\u7684\u529f\u80fd\uff0c\u6bd4\u5982\u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20\u3001\u66ff\u6362\u4e00\u4e2a\u5143\u7d20\u3001\u83b7\u53d6\u524d\u9762\u6216\u540e\u9762\u5143\u7d20\u7684\u7d22\u5f15\u4f4d\u7f6e\u3002<\/li><\/ul>\n\n\n\n
34. \u600e\u4e48\u786e\u4fdd\u4e00\u4e2a\u96c6\u5408\u4e0d\u80fd\u88ab\u4fee\u6539\uff1f<\/h4>\n\n\n\n
\u53ef\u4ee5\u4f7f\u7528 Collections. unmodifiableCollection(Collection c) \u65b9\u6cd5\u6765\u521b\u5efa\u4e00\u4e2a\u53ea\u8bfb\u96c6\u5408\uff0c\u8fd9\u6837\u6539\u53d8\u96c6\u5408\u7684\u4efb\u4f55\u64cd\u4f5c\u90fd\u4f1a\u629b\u51fa Java. lang. UnsupportedOperationException \u5f02\u5e38\u3002<\/p>\n\n\n\n
\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
List<String> list = new ArrayList<>();\nlist. add(\"x\");\nCollection<String> clist = Collections. unmodifiableCollection(list);\nclist. add(\"y\"); \/\/ \u8fd0\u884c\u65f6\u6b64\u884c\u62a5\u9519\nSystem. out. println(list. size());<\/code><\/pre>\n\n\n\n\u591a\u7ebf\u7a0b<\/h3>\n\n\n\n35. \u5e76\u884c\u548c\u5e76\u53d1\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- \u5e76\u884c\uff1a\u591a\u4e2a\u5904\u7406\u5668\u6216\u591a\u6838\u5904\u7406\u5668\u540c\u65f6\u5904\u7406\u591a\u4e2a\u4efb\u52a1\u3002<\/li>
- \u5e76\u53d1\uff1a\u591a\u4e2a\u4efb\u52a1\u5728\u540c\u4e00\u4e2a CPU \u6838\u4e0a\uff0c\u6309\u7ec6\u5206\u7684\u65f6\u95f4\u7247\u8f6e\u6d41(\u4ea4\u66ff)\u6267\u884c\uff0c\u4ece\u903b\u8f91\u4e0a\u6765\u770b\u90a3\u4e9b\u4efb\u52a1\u662f\u540c\u65f6\u6267\u884c\u3002<\/li><\/ul>\n\n\n\n
\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n
![\"\"](\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2021\/09\/pf-px.png\")
\u5e76\u884c\u548c\u5e76\u53d1\u7684\u533a\u522b<\/figcaption><\/figure><\/div>\n\n\n\n\u5e76\u53d1 = \u4e24\u4e2a\u961f\u5217\u548c\u4e00\u53f0\u5496\u5561\u673a\u3002<\/p>\n\n\n\n
\u5e76\u884c = \u4e24\u4e2a\u961f\u5217\u548c\u4e24\u53f0\u5496\u5561\u673a\u3002<\/p>\n\n\n\n
36. \u7ebf\u7a0b\u548c\u8fdb\u7a0b\u7684\u533a\u522b\uff1f<\/h4>\n\n\n\n
\u4e00\u4e2a\u7a0b\u5e8f\u4e0b\u81f3\u5c11\u6709\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u4e0b\u81f3\u5c11\u6709\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u4e0b\u4e5f\u53ef\u4ee5\u6709\u591a\u4e2a\u7ebf\u7a0b\u6765\u589e\u52a0\u7a0b\u5e8f\u7684\u6267\u884c\u901f\u5ea6\u3002<\/p>\n\n\n\n
37. \u5b88\u62a4\u7ebf\u7a0b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
\u5b88\u62a4\u7ebf\u7a0b\u662f\u8fd0\u884c\u5728\u540e\u53f0\u7684\u4e00\u79cd\u7279\u6b8a\u8fdb\u7a0b\u3002\u5b83\u72ec\u7acb\u4e8e\u63a7\u5236\u7ec8\u7aef\u5e76\u4e14\u5468\u671f\u6027\u5730\u6267\u884c\u67d0\u79cd\u4efb\u52a1\u6216\u7b49\u5f85\u5904\u7406\u67d0\u4e9b\u53d1\u751f\u7684\u4e8b\u4ef6\u3002\u5728 Java \u4e2d\u5783\u573e\u56de\u6536\u7ebf\u7a0b\u5c31\u662f\u7279\u6b8a\u7684\u5b88\u62a4\u7ebf\u7a0b\u3002<\/p>\n\n\n\n
38. \u521b\u5efa\u7ebf\u7a0b\u6709\u54ea\u51e0\u79cd\u65b9\u5f0f\uff1f<\/h4>\n\n\n\n
\u521b\u5efa\u7ebf\u7a0b\u6709\u4e09\u79cd\u65b9\u5f0f\uff1a<\/p>\n\n\n\n
- \u7ee7\u627f Thread \u91cd\u5199 run \u65b9\u6cd5\uff1b<\/li>
- \u5b9e\u73b0 Runnable \u63a5\u53e3\uff1b<\/li>
- \u5b9e\u73b0 Callable \u63a5\u53e3\u3002<\/li><\/ul>\n\n\n\n
39. \u8bf4\u4e00\u4e0b runnable \u548c callable \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
runnable \u6ca1\u6709\u8fd4\u56de\u503c\uff0ccallable \u53ef\u4ee5\u62ff\u5230\u6709\u8fd4\u56de\u503c\uff0ccallable \u53ef\u4ee5\u770b\u4f5c\u662f runnable \u7684\u8865\u5145\u3002<\/p>\n\n\n\n
40. \u7ebf\u7a0b\u6709\u54ea\u4e9b\u72b6\u6001\uff1f<\/h4>\n\n\n\n
\u7ebf\u7a0b\u7684\u72b6\u6001\uff1a<\/p>\n\n\n\n
- NEW \u5c1a\u672a\u542f\u52a8<\/li>
- RUNNABLE \u6b63\u5728\u6267\u884c\u4e2d<\/li>
- BLOCKED \u963b\u585e\u7684\uff08\u88ab\u540c\u6b65\u9501\u6216\u8005IO\u9501\u963b\u585e\uff09<\/li>
- WAITING \u6c38\u4e45\u7b49\u5f85\u72b6\u6001<\/li>
- TIMED_WAITING \u7b49\u5f85\u6307\u5b9a\u7684\u65f6\u95f4\u91cd\u65b0\u88ab\u5524\u9192\u7684\u72b6\u6001<\/li>
- TERMINATED \u6267\u884c\u5b8c\u6210<\/li><\/ul>\n\n\n\n
41. sleep() \u548c wait() \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- \u7c7b\u7684\u4e0d\u540c\uff1asleep() \u6765\u81ea Thread\uff0cwait() \u6765\u81ea Object\u3002<\/li>
- \u91ca\u653e\u9501\uff1asleep() \u4e0d\u91ca\u653e\u9501\uff1bwait() \u91ca\u653e\u9501\u3002<\/li>
- \u7528\u6cd5\u4e0d\u540c\uff1asleep() \u65f6\u95f4\u5230\u4f1a\u81ea\u52a8\u6062\u590d\uff1bwait() \u53ef\u4ee5\u4f7f\u7528 notify()\/notifyAll()\u76f4\u63a5\u5524\u9192\u3002<\/li><\/ul>\n\n\n\n
42. notify()\u548c notifyAll()\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
notifyAll()\u4f1a\u5524\u9192\u6240\u6709\u7684\u7ebf\u7a0b\uff0cnotify()\u4e4b\u540e\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b\u3002notifyAll() \u8c03\u7528\u540e\uff0c\u4f1a\u5c06\u5168\u90e8\u7ebf\u7a0b\u7531\u7b49\u5f85\u6c60\u79fb\u5230\u9501\u6c60\uff0c\u7136\u540e\u53c2\u4e0e\u9501\u7684\u7ade\u4e89\uff0c\u7ade\u4e89\u6210\u529f\u5219\u7ee7\u7eed\u6267\u884c\uff0c\u5982\u679c\u4e0d\u6210\u529f\u5219\u7559\u5728\u9501\u6c60\u7b49\u5f85\u9501\u88ab\u91ca\u653e\u540e\u518d\u6b21\u53c2\u4e0e\u7ade\u4e89\u3002\u800c notify()\u53ea\u4f1a\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u5177\u4f53\u5524\u9192\u54ea\u4e00\u4e2a\u7ebf\u7a0b\u7531\u865a\u62df\u673a\u63a7\u5236\u3002<\/p>\n\n\n\n
43. \u7ebf\u7a0b\u7684 run() \u548c start() \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
start() \u65b9\u6cd5\u7528\u4e8e\u542f\u52a8\u7ebf\u7a0b\uff0crun() \u65b9\u6cd5\u7528\u4e8e\u6267\u884c\u7ebf\u7a0b\u7684\u8fd0\u884c\u65f6\u4ee3\u7801\u3002run() \u53ef\u4ee5\u91cd\u590d\u8c03\u7528\uff0c\u800c start() \u53ea\u80fd\u8c03\u7528\u4e00\u6b21\u3002<\/p>\n\n\n\n
44. \u521b\u5efa\u7ebf\u7a0b\u6c60\u6709\u54ea\u51e0\u79cd\u65b9\u5f0f\uff1f<\/h4>\n\n\n\n
\u7ebf\u7a0b\u6c60\u521b\u5efa\u6709\u4e03\u79cd\u65b9\u5f0f\uff0c\u6700\u6838\u5fc3\u7684\u662f\u6700\u540e\u4e00\u79cd\uff1a<\/p>\n\n\n\n
- newSingleThreadExecutor()\uff1a\u5b83\u7684\u7279\u70b9\u5728\u4e8e\u5de5\u4f5c\u7ebf\u7a0b\u6570\u76ee\u88ab\u9650\u5236\u4e3a 1\uff0c\u64cd\u4f5c\u4e00\u4e2a\u65e0\u754c\u7684\u5de5\u4f5c\u961f\u5217\uff0c\u6240\u4ee5\u5b83\u4fdd\u8bc1\u4e86\u6240\u6709\u4efb\u52a1\u7684\u90fd\u662f\u88ab\u987a\u5e8f\u6267\u884c\uff0c\u6700\u591a\u4f1a\u6709\u4e00\u4e2a\u4efb\u52a1\u5904\u4e8e\u6d3b\u52a8\u72b6\u6001\uff0c\u5e76\u4e14\u4e0d\u5141\u8bb8\u4f7f\u7528\u8005\u6539\u52a8\u7ebf\u7a0b\u6c60\u5b9e\u4f8b\uff0c\u56e0\u6b64\u53ef\u4ee5\u907f\u514d\u5176\u6539\u53d8\u7ebf\u7a0b\u6570\u76ee\uff1b<\/li>
- newCachedThreadPool()\uff1a\u5b83\u662f\u4e00\u79cd\u7528\u6765\u5904\u7406\u5927\u91cf\u77ed\u65f6\u95f4\u5de5\u4f5c\u4efb\u52a1\u7684\u7ebf\u7a0b\u6c60\uff0c\u5177\u6709\u51e0\u4e2a\u9c9c\u660e\u7279\u70b9\uff1a\u5b83\u4f1a\u8bd5\u56fe\u7f13\u5b58\u7ebf\u7a0b\u5e76\u91cd\u7528\uff0c\u5f53\u65e0\u7f13\u5b58\u7ebf\u7a0b\u53ef\u7528\u65f6\uff0c\u5c31\u4f1a\u521b\u5efa\u65b0\u7684\u5de5\u4f5c\u7ebf\u7a0b\uff1b\u5982\u679c\u7ebf\u7a0b\u95f2\u7f6e\u7684\u65f6\u95f4\u8d85\u8fc7 60 \u79d2\uff0c\u5219\u88ab\u7ec8\u6b62\u5e76\u79fb\u51fa\u7f13\u5b58\uff1b\u957f\u65f6\u95f4\u95f2\u7f6e\u65f6\uff0c\u8fd9\u79cd\u7ebf\u7a0b\u6c60\uff0c\u4e0d\u4f1a\u6d88\u8017\u4ec0\u4e48\u8d44\u6e90\u3002\u5176\u5185\u90e8\u4f7f\u7528 SynchronousQueue \u4f5c\u4e3a\u5de5\u4f5c\u961f\u5217\uff1b<\/li>
- newFixedThreadPool(int nThreads)\uff1a\u91cd\u7528\u6307\u5b9a\u6570\u76ee\uff08nThreads\uff09\u7684\u7ebf\u7a0b\uff0c\u5176\u80cc\u540e\u4f7f\u7528\u7684\u662f\u65e0\u754c\u7684\u5de5\u4f5c\u961f\u5217\uff0c\u4efb\u4f55\u65f6\u5019\u6700\u591a\u6709 nThreads \u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u662f\u6d3b\u52a8\u7684\u3002\u8fd9\u610f\u5473\u7740\uff0c\u5982\u679c\u4efb\u52a1\u6570\u91cf\u8d85\u8fc7\u4e86\u6d3b\u52a8\u961f\u5217\u6570\u76ee\uff0c\u5c06\u5728\u5de5\u4f5c\u961f\u5217\u4e2d\u7b49\u5f85\u7a7a\u95f2\u7ebf\u7a0b\u51fa\u73b0\uff1b\u5982\u679c\u6709\u5de5\u4f5c\u7ebf\u7a0b\u9000\u51fa\uff0c\u5c06\u4f1a\u6709\u65b0\u7684\u5de5\u4f5c\u7ebf\u7a0b\u88ab\u521b\u5efa\uff0c\u4ee5\u8865\u8db3\u6307\u5b9a\u7684\u6570\u76ee nThreads\uff1b<\/li>
- newSingleThreadScheduledExecutor()\uff1a\u521b\u5efa\u5355\u7ebf\u7a0b\u6c60\uff0c\u8fd4\u56de ScheduledExecutorService\uff0c\u53ef\u4ee5\u8fdb\u884c\u5b9a\u65f6\u6216\u5468\u671f\u6027\u7684\u5de5\u4f5c\u8c03\u5ea6\uff1b<\/li>
- newScheduledThreadPool(int corePoolSize)\uff1a\u548cnewSingleThreadScheduledExecutor()\u7c7b\u4f3c\uff0c\u521b\u5efa\u7684\u662f\u4e2a ScheduledExecutorService\uff0c\u53ef\u4ee5\u8fdb\u884c\u5b9a\u65f6\u6216\u5468\u671f\u6027\u7684\u5de5\u4f5c\u8c03\u5ea6\uff0c\u533a\u522b\u5728\u4e8e\u5355\u4e00\u5de5\u4f5c\u7ebf\u7a0b\u8fd8\u662f\u591a\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\uff1b<\/li>
- newWorkStealingPool(int parallelism)\uff1a\u8fd9\u662f\u4e00\u4e2a\u7ecf\u5e38\u88ab\u4eba\u5ffd\u7565\u7684\u7ebf\u7a0b\u6c60\uff0cJava 8 \u624d\u52a0\u5165\u8fd9\u4e2a\u521b\u5efa\u65b9\u6cd5\uff0c\u5176\u5185\u90e8\u4f1a\u6784\u5efaForkJoinPool\uff0c\u5229\u7528Work-Stealing\u7b97\u6cd5\uff0c\u5e76\u884c\u5730\u5904\u7406\u4efb\u52a1\uff0c\u4e0d\u4fdd\u8bc1\u5904\u7406\u987a\u5e8f\uff1b<\/li>
- ThreadPoolExecutor()\uff1a\u662f\u6700\u539f\u59cb\u7684\u7ebf\u7a0b\u6c60\u521b\u5efa\uff0c\u4e0a\u97621-3\u521b\u5efa\u65b9\u5f0f\u90fd\u662f\u5bf9ThreadPoolExecutor\u7684\u5c01\u88c5\u3002<\/li><\/ul>\n\n\n\n
45. \u7ebf\u7a0b\u6c60\u90fd\u6709\u54ea\u4e9b\u72b6\u6001\uff1f<\/h4>\n\n\n\n- RUNNING\uff1a\u8fd9\u662f\u6700\u6b63\u5e38\u7684\u72b6\u6001\uff0c\u63a5\u53d7\u65b0\u7684\u4efb\u52a1\uff0c\u5904\u7406\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4efb\u52a1\u3002<\/li>
- SHUTDOWN\uff1a\u4e0d\u63a5\u53d7\u65b0\u7684\u4efb\u52a1\u63d0\u4ea4\uff0c\u4f46\u662f\u4f1a\u7ee7\u7eed\u5904\u7406\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4efb\u52a1\u3002<\/li>
- STOP\uff1a\u4e0d\u63a5\u53d7\u65b0\u7684\u4efb\u52a1\u63d0\u4ea4\uff0c\u4e0d\u518d\u5904\u7406\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4efb\u52a1\uff0c\u4e2d\u65ad\u6b63\u5728\u6267\u884c\u4efb\u52a1\u7684\u7ebf\u7a0b\u3002<\/li>
- TIDYING\uff1a\u6240\u6709\u7684\u4efb\u52a1\u90fd\u9500\u6bc1\u4e86\uff0cworkCount \u4e3a 0\uff0c\u7ebf\u7a0b\u6c60\u7684\u72b6\u6001\u5728\u8f6c\u6362\u4e3a TIDYING \u72b6\u6001\u65f6\uff0c\u4f1a\u6267\u884c\u94a9\u5b50\u65b9\u6cd5 terminated()\u3002<\/li>
- TERMINATED\uff1aterminated()\u65b9\u6cd5\u7ed3\u675f\u540e\uff0c\u7ebf\u7a0b\u6c60\u7684\u72b6\u6001\u5c31\u4f1a\u53d8\u6210\u8fd9\u4e2a\u3002<\/li><\/ul>\n\n\n\n
46. \u7ebf\u7a0b\u6c60\u4e2d submit() \u548c execute() \u65b9\u6cd5\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- execute()\uff1a\u53ea\u80fd\u6267\u884c Runnable \u7c7b\u578b\u7684\u4efb\u52a1\u3002<\/li>
- submit()\uff1a\u53ef\u4ee5\u6267\u884c Runnable \u548c Callable \u7c7b\u578b\u7684\u4efb\u52a1\u3002<\/li><\/ul>\n\n\n\n
Callable \u7c7b\u578b\u7684\u4efb\u52a1\u53ef\u4ee5\u83b7\u53d6\u6267\u884c\u7684\u8fd4\u56de\u503c\uff0c\u800c Runnable \u6267\u884c\u65e0\u8fd4\u56de\u503c\u3002<\/p>\n\n\n\n
47. \u5728 Java \u7a0b\u5e8f\u4e2d\u600e\u4e48\u4fdd\u8bc1\u591a\u7ebf\u7a0b\u7684\u8fd0\u884c\u5b89\u5168\uff1f<\/h4>\n\n\n\n- \u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528\u5b89\u5168\u7c7b\uff0c\u6bd4\u5982 Java. util. concurrent \u4e0b\u7684\u7c7b\u3002<\/li>
- \u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528\u81ea\u52a8\u9501 synchronized\u3002<\/li>
- \u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528\u624b\u52a8\u9501 Lock\u3002<\/li><\/ul>\n\n\n\n
\u624b\u52a8\u9501 Java \u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
Lock lock = new ReentrantLock();\nlock. lock();\ntry {\n System. out. println(\"\u83b7\u5f97\u9501\");\n} catch (Exception e) {\n \/\/ TODO: handle exception\n} finally {\n System. out. println(\"\u91ca\u653e\u9501\");\n lock. unlock();\n}<\/code><\/pre>\n\n\n\n48. \u591a\u7ebf\u7a0b\u4e2d synchronized \u9501\u5347\u7ea7\u7684\u539f\u7406\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
synchronized \u9501\u5347\u7ea7\u539f\u7406\uff1a\u5728\u9501\u5bf9\u8c61\u7684\u5bf9\u8c61\u5934\u91cc\u9762\u6709\u4e00\u4e2a threadid \u5b57\u6bb5\uff0c\u5728\u7b2c\u4e00\u6b21\u8bbf\u95ee\u7684\u65f6\u5019 threadid \u4e3a\u7a7a\uff0cjvm \u8ba9\u5176\u6301\u6709\u504f\u5411\u9501\uff0c\u5e76\u5c06 threadid \u8bbe\u7f6e\u4e3a\u5176\u7ebf\u7a0b id\uff0c\u518d\u6b21\u8fdb\u5165\u7684\u65f6\u5019\u4f1a\u5148\u5224\u65ad threadid \u662f\u5426\u4e0e\u5176\u7ebf\u7a0b id \u4e00\u81f4\uff0c\u5982\u679c\u4e00\u81f4\u5219\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u6b64\u5bf9\u8c61\uff0c\u5982\u679c\u4e0d\u4e00\u81f4\uff0c\u5219\u5347\u7ea7\u504f\u5411\u9501\u4e3a\u8f7b\u91cf\u7ea7\u9501\uff0c\u901a\u8fc7\u81ea\u65cb\u5faa\u73af\u4e00\u5b9a\u6b21\u6570\u6765\u83b7\u53d6\u9501\uff0c\u6267\u884c\u4e00\u5b9a\u6b21\u6570\u4e4b\u540e\uff0c\u5982\u679c\u8fd8\u6ca1\u6709\u6b63\u5e38\u83b7\u53d6\u5230\u8981\u4f7f\u7528\u7684\u5bf9\u8c61\uff0c\u6b64\u65f6\u5c31\u4f1a\u628a\u9501\u4ece\u8f7b\u91cf\u7ea7\u5347\u7ea7\u4e3a\u91cd\u91cf\u7ea7\u9501\uff0c\u6b64\u8fc7\u7a0b\u5c31\u6784\u6210\u4e86 synchronized \u9501\u7684\u5347\u7ea7\u3002<\/p>\n\n\n\n
\u9501\u7684\u5347\u7ea7\u7684\u76ee\u7684\uff1a\u9501\u5347\u7ea7\u662f\u4e3a\u4e86\u51cf\u4f4e\u4e86\u9501\u5e26\u6765\u7684\u6027\u80fd\u6d88\u8017\u3002\u5728 Java 6 \u4e4b\u540e\u4f18\u5316 synchronized \u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u4f7f\u7528\u4e86\u504f\u5411\u9501\u5347\u7ea7\u4e3a\u8f7b\u91cf\u7ea7\u9501\u518d\u5347\u7ea7\u5230\u91cd\u91cf\u7ea7\u9501\u7684\u65b9\u5f0f\uff0c\u4ece\u800c\u51cf\u4f4e\u4e86\u9501\u5e26\u6765\u7684\u6027\u80fd\u6d88\u8017\u3002<\/p>\n\n\n\n
49. \u4ec0\u4e48\u662f\u6b7b\u9501\uff1f<\/h4>\n\n\n\n
\u5f53\u7ebf\u7a0b A \u6301\u6709\u72ec\u5360\u9501a\uff0c\u5e76\u5c1d\u8bd5\u53bb\u83b7\u53d6\u72ec\u5360\u9501 b \u7684\u540c\u65f6\uff0c\u7ebf\u7a0b B \u6301\u6709\u72ec\u5360\u9501 b\uff0c\u5e76\u5c1d\u8bd5\u83b7\u53d6\u72ec\u5360\u9501 a \u7684\u60c5\u51b5\u4e0b\uff0c\u5c31\u4f1a\u53d1\u751f AB \u4e24\u4e2a\u7ebf\u7a0b\u7531\u4e8e\u4e92\u76f8\u6301\u6709\u5bf9\u65b9\u9700\u8981\u7684\u9501\uff0c\u800c\u53d1\u751f\u7684\u963b\u585e\u73b0\u8c61\uff0c\u6211\u4eec\u79f0\u4e3a\u6b7b\u9501\u3002<\/p>\n\n\n\n
50. \u600e\u4e48\u9632\u6b62\u6b7b\u9501\uff1f<\/h4>\n\n\n\n- \u5c3d\u91cf\u4f7f\u7528 tryLock(long timeout, TimeUnit unit)\u7684\u65b9\u6cd5(ReentrantLock\u3001ReentrantReadWriteLock)\uff0c\u8bbe\u7f6e\u8d85\u65f6\u65f6\u95f4\uff0c\u8d85\u65f6\u53ef\u4ee5\u9000\u51fa\u9632\u6b62\u6b7b\u9501\u3002<\/li>
- \u5c3d\u91cf\u4f7f\u7528 Java. util. concurrent \u5e76\u53d1\u7c7b\u4ee3\u66ff\u81ea\u5df1\u624b\u5199\u9501\u3002<\/li>
- \u5c3d\u91cf\u964d\u4f4e\u9501\u7684\u4f7f\u7528\u7c92\u5ea6\uff0c\u5c3d\u91cf\u4e0d\u8981\u51e0\u4e2a\u529f\u80fd\u7528\u540c\u4e00\u628a\u9501\u3002<\/li>
- \u5c3d\u91cf\u51cf\u5c11\u540c\u6b65\u7684\u4ee3\u7801\u5757\u3002<\/li><\/ul>\n\n\n\n
51. ThreadLocal \u662f\u4ec0\u4e48\uff1f\u6709\u54ea\u4e9b\u4f7f\u7528\u573a\u666f\uff1f<\/h4>\n\n\n\n
ThreadLocal \u4e3a\u6bcf\u4e2a\u4f7f\u7528\u8be5\u53d8\u91cf\u7684\u7ebf\u7a0b\u63d0\u4f9b\u72ec\u7acb\u7684\u53d8\u91cf\u526f\u672c\uff0c\u6240\u4ee5\u6bcf\u4e00\u4e2a\u7ebf\u7a0b\u90fd\u53ef\u4ee5\u72ec\u7acb\u5730\u6539\u53d8\u81ea\u5df1\u7684\u526f\u672c\uff0c\u800c\u4e0d\u4f1a\u5f71\u54cd\u5176\u5b83\u7ebf\u7a0b\u6240\u5bf9\u5e94\u7684\u526f\u672c\u3002<\/p>\n\n\n\n
ThreadLocal \u7684\u7ecf\u5178\u4f7f\u7528\u573a\u666f\u662f\u6570\u636e\u5e93\u8fde\u63a5\u548c session \u7ba1\u7406\u7b49\u3002<\/p>\n\n\n\n
52. \u8bf4\u4e00\u4e0b synchronized \u5e95\u5c42\u5b9e\u73b0\u539f\u7406\uff1f<\/h4>\n\n\n\n
synchronized \u662f\u7531\u4e00\u5bf9 monitorenter\/monitorexit \u6307\u4ee4\u5b9e\u73b0\u7684\uff0cmonitor \u5bf9\u8c61\u662f\u540c\u6b65\u7684\u57fa\u672c\u5b9e\u73b0\u5355\u5143\u3002\u5728 Java 6 \u4e4b\u524d\uff0cmonitor \u7684\u5b9e\u73b0\u5b8c\u5168\u662f\u4f9d\u9760\u64cd\u4f5c\u7cfb\u7edf\u5185\u90e8\u7684\u4e92\u65a5\u9501\uff0c\u56e0\u4e3a\u9700\u8981\u8fdb\u884c\u7528\u6237\u6001\u5230\u5185\u6838\u6001\u7684\u5207\u6362\uff0c\u6240\u4ee5\u540c\u6b65\u64cd\u4f5c\u662f\u4e00\u4e2a\u65e0\u5dee\u522b\u7684\u91cd\u91cf\u7ea7\u64cd\u4f5c\uff0c\u6027\u80fd\u4e5f\u5f88\u4f4e\u3002\u4f46\u5728 Java 6 \u7684\u65f6\u5019\uff0cJava \u865a\u62df\u673a \u5bf9\u6b64\u8fdb\u884c\u4e86\u5927\u5200\u9614\u65a7\u5730\u6539\u8fdb\uff0c\u63d0\u4f9b\u4e86\u4e09\u79cd\u4e0d\u540c\u7684 monitor \u5b9e\u73b0\uff0c\u4e5f\u5c31\u662f\u5e38\u8bf4\u7684\u4e09\u79cd\u4e0d\u540c\u7684\u9501\uff1a\u504f\u5411\u9501\uff08Biased Locking\uff09\u3001\u8f7b\u91cf\u7ea7\u9501\u548c\u91cd\u91cf\u7ea7\u9501\uff0c\u5927\u5927\u6539\u8fdb\u4e86\u5176\u6027\u80fd\u3002<\/p>\n\n\n\n
53. synchronized \u548c volatile \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n- volatile \u662f\u53d8\u91cf\u4fee\u9970\u7b26\uff1bsynchronized \u662f\u4fee\u9970\u7c7b\u3001\u65b9\u6cd5\u3001\u4ee3\u7801\u6bb5\u3002<\/li>
- volatile \u4ec5\u80fd\u5b9e\u73b0\u53d8\u91cf\u7684\u4fee\u6539\u53ef\u89c1\u6027\uff0c\u4e0d\u80fd\u4fdd\u8bc1\u539f\u5b50\u6027\uff1b\u800c synchronized \u5219\u53ef\u4ee5\u4fdd\u8bc1\u53d8\u91cf\u7684\u4fee\u6539\u53ef\u89c1\u6027\u548c\u539f\u5b50\u6027\u3002<\/li>
- volatile \u4e0d\u4f1a\u9020\u6210\u7ebf\u7a0b\u7684\u963b\u585e\uff1bsynchronized \u53ef\u80fd\u4f1a\u9020\u6210\u7ebf\u7a0b\u7684\u963b\u585e\u3002<\/li><\/ul>\n\n\n\n
54. synchronized \u548c Lock \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- synchronized \u53ef\u4ee5\u7ed9\u7c7b\u3001\u65b9\u6cd5\u3001\u4ee3\u7801\u5757\u52a0\u9501\uff1b\u800c lock \u53ea\u80fd\u7ed9\u4ee3\u7801\u5757\u52a0\u9501\u3002<\/li>
- synchronized \u4e0d\u9700\u8981\u624b\u52a8\u83b7\u53d6\u9501\u548c\u91ca\u653e\u9501\uff0c\u4f7f\u7528\u7b80\u5355\uff0c\u53d1\u751f\u5f02\u5e38\u4f1a\u81ea\u52a8\u91ca\u653e\u9501\uff0c\u4e0d\u4f1a\u9020\u6210\u6b7b\u9501\uff1b\u800c lock \u9700\u8981\u81ea\u5df1\u52a0\u9501\u548c\u91ca\u653e\u9501\uff0c\u5982\u679c\u4f7f\u7528\u4e0d\u5f53\u6ca1\u6709 unLock()\u53bb\u91ca\u653e\u9501\u5c31\u4f1a\u9020\u6210\u6b7b\u9501\u3002<\/li>
- \u901a\u8fc7 Lock \u53ef\u4ee5\u77e5\u9053\u6709\u6ca1\u6709\u6210\u529f\u83b7\u53d6\u9501\uff0c\u800c synchronized \u5374\u65e0\u6cd5\u529e\u5230\u3002<\/li><\/ul>\n\n\n\n
55. synchronized \u548c ReentrantLock \u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
synchronized \u65e9\u671f\u7684\u5b9e\u73b0\u6bd4\u8f83\u4f4e\u6548\uff0c\u5bf9\u6bd4 ReentrantLock\uff0c\u5927\u591a\u6570\u573a\u666f\u6027\u80fd\u90fd\u76f8\u5dee\u8f83\u5927\uff0c\u4f46\u662f\u5728 Java 6 \u4e2d\u5bf9 synchronized \u8fdb\u884c\u4e86\u975e\u5e38\u591a\u7684\u6539\u8fdb\u3002<\/p>\n\n\n\n
\u4e3b\u8981\u533a\u522b\u5982\u4e0b\uff1a<\/p>\n\n\n\n
- ReentrantLock \u4f7f\u7528\u8d77\u6765\u6bd4\u8f83\u7075\u6d3b\uff0c\u4f46\u662f\u5fc5\u987b\u6709\u91ca\u653e\u9501\u7684\u914d\u5408\u52a8\u4f5c\uff1b<\/li>
- ReentrantLock \u5fc5\u987b\u624b\u52a8\u83b7\u53d6\u4e0e\u91ca\u653e\u9501\uff0c\u800c synchronized \u4e0d\u9700\u8981\u624b\u52a8\u91ca\u653e\u548c\u5f00\u542f\u9501\uff1b<\/li>
- ReentrantLock \u53ea\u9002\u7528\u4e8e\u4ee3\u7801\u5757\u9501\uff0c\u800c synchronized \u53ef\u7528\u4e8e\u4fee\u9970\u65b9\u6cd5\u3001\u4ee3\u7801\u5757\u7b49\u3002<\/li><\/ul>\n\n\n\n
56. \u8bf4\u4e00\u4e0b atomic \u7684\u539f\u7406\uff1f<\/h4>\n\n\n\n
atomic \u4e3b\u8981\u5229\u7528 CAS (Compare And Wwap) \u548c volatile \u548c native \u65b9\u6cd5\u6765\u4fdd\u8bc1\u539f\u5b50\u64cd\u4f5c\uff0c\u4ece\u800c\u907f\u514d synchronized \u7684\u9ad8\u5f00\u9500\uff0c\u6267\u884c\u6548\u7387\u5927\u4e3a\u63d0\u5347\u3002<\/p>\n\n\n\n
\u53cd\u5c04<\/h3>\n\n\n\n57. \u4ec0\u4e48\u662f\u53cd\u5c04\uff1f<\/h4>\n\n\n\n
\u53cd\u5c04\u662f\u5728\u8fd0\u884c\u72b6\u6001\u4e2d\uff0c\u5bf9\u4e8e\u4efb\u610f\u4e00\u4e2a\u7c7b\uff0c\u90fd\u80fd\u591f\u77e5\u9053\u8fd9\u4e2a\u7c7b\u7684\u6240\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\uff1b\u5bf9\u4e8e\u4efb\u610f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u90fd\u80fd\u591f\u8c03\u7528\u5b83\u7684\u4efb\u610f\u4e00\u4e2a\u65b9\u6cd5\u548c\u5c5e\u6027\uff1b\u8fd9\u79cd\u52a8\u6001\u83b7\u53d6\u7684\u4fe1\u606f\u4ee5\u53ca\u52a8\u6001\u8c03\u7528\u5bf9\u8c61\u7684\u65b9\u6cd5\u7684\u529f\u80fd\u79f0\u4e3a Java \u8bed\u8a00\u7684\u53cd\u5c04\u673a\u5236\u3002<\/p>\n\n\n\n
58. \u4ec0\u4e48\u662f Java \u5e8f\u5217\u5316\uff1f\u4ec0\u4e48\u60c5\u51b5\u4e0b\u9700\u8981\u5e8f\u5217\u5316\uff1f<\/h4>\n\n\n\n
Java \u5e8f\u5217\u5316\u662f\u4e3a\u4e86\u4fdd\u5b58\u5404\u79cd\u5bf9\u8c61\u5728\u5185\u5b58\u4e2d\u7684\u72b6\u6001\uff0c\u5e76\u4e14\u53ef\u4ee5\u628a\u4fdd\u5b58\u7684\u5bf9\u8c61\u72b6\u6001\u518d\u8bfb\u51fa\u6765\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u60c5\u51b5\u9700\u8981\u4f7f\u7528 Java \u5e8f\u5217\u5316\uff1a<\/p>\n\n\n\n
- \u60f3\u628a\u7684\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u72b6\u6001\u4fdd\u5b58\u5230\u4e00\u4e2a\u6587\u4ef6\u4e2d\u6216\u8005\u6570\u636e\u5e93\u4e2d\u65f6\u5019\uff1b<\/li>
- \u60f3\u7528\u5957\u63a5\u5b57\u5728\u7f51\u7edc\u4e0a\u4f20\u9001\u5bf9\u8c61\u7684\u65f6\u5019\uff1b<\/li>
- \u60f3\u901a\u8fc7RMI\uff08\u8fdc\u7a0b\u65b9\u6cd5\u8c03\u7528\uff09\u4f20\u8f93\u5bf9\u8c61\u7684\u65f6\u5019\u3002<\/li><\/ul>\n\n\n\n
59. \u52a8\u6001\u4ee3\u7406\u662f\u4ec0\u4e48\uff1f\u6709\u54ea\u4e9b\u5e94\u7528\uff1f<\/h4>\n\n\n\n
\u52a8\u6001\u4ee3\u7406\u662f\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u4ee3\u7406\u7c7b\u3002<\/p>\n\n\n\n
\u52a8\u6001\u4ee3\u7406\u7684\u5e94\u7528\u6709 spring aop\u3001hibernate \u6570\u636e\u67e5\u8be2\u3001\u6d4b\u8bd5\u6846\u67b6\u7684\u540e\u7aef mock\u3001rpc\uff0cJava\u6ce8\u89e3\u5bf9\u8c61\u83b7\u53d6\u7b49\u3002<\/p>\n\n\n\n
60. \u600e\u4e48\u5b9e\u73b0\u52a8\u6001\u4ee3\u7406\uff1f<\/h4>\n\n\n\n
JDK \u539f\u751f\u52a8\u6001\u4ee3\u7406\u548c cglib \u52a8\u6001\u4ee3\u7406\u3002JDK \u539f\u751f\u52a8\u6001\u4ee3\u7406\u662f\u57fa\u4e8e\u63a5\u53e3\u5b9e\u73b0\u7684\uff0c\u800c cglib \u662f\u57fa\u4e8e\u7ee7\u627f\u5f53\u524d\u7c7b\u7684\u5b50\u7c7b\u5b9e\u73b0\u7684\u3002<\/p>\n\n\n\n
\u5bf9\u8c61\u62f7\u8d1d<\/h3>\n\n\n\n61. \u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u514b\u9686\uff1f<\/h4>\n\n\n\n
\u514b\u9686\u7684\u5bf9\u8c61\u53ef\u80fd\u5305\u542b\u4e00\u4e9b\u5df2\u7ecf\u4fee\u6539\u8fc7\u7684\u5c5e\u6027\uff0c\u800c new \u51fa\u6765\u7684\u5bf9\u8c61\u7684\u5c5e\u6027\u90fd\u8fd8\u662f\u521d\u59cb\u5316\u65f6\u5019\u7684\u503c\uff0c\u6240\u4ee5\u5f53\u9700\u8981\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\u6765\u4fdd\u5b58\u5f53\u524d\u5bf9\u8c61\u7684\u201c\u72b6\u6001\u201d\u5c31\u9760\u514b\u9686\u65b9\u6cd5\u4e86\u3002<\/p>\n\n\n\n
62. \u5982\u4f55\u5b9e\u73b0\u5bf9\u8c61\u514b\u9686\uff1f<\/h4>\n\n\n\n- \u5b9e\u73b0 Cloneable \u63a5\u53e3\u5e76\u91cd\u5199 Object \u7c7b\u4e2d\u7684 clone() \u65b9\u6cd5\u3002<\/li>
- \u5b9e\u73b0 Serializable \u63a5\u53e3\uff0c\u901a\u8fc7\u5bf9\u8c61\u7684\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u5b9e\u73b0\u514b\u9686\uff0c\u53ef\u4ee5\u5b9e\u73b0\u771f\u6b63\u7684\u6df1\u5ea6\u514b\u9686\u3002<\/li><\/ul>\n\n\n\n
63. \u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n- \u6d45\u514b\u9686\uff1a\u5f53\u5bf9\u8c61\u88ab\u590d\u5236\u65f6\u53ea\u590d\u5236\u5b83\u672c\u8eab\u548c\u5176\u4e2d\u5305\u542b\u7684\u503c\u7c7b\u578b\u7684\u6210\u5458\u53d8\u91cf\uff0c\u800c\u5f15\u7528\u7c7b\u578b\u7684\u6210\u5458\u5bf9\u8c61\u5e76\u6ca1\u6709\u590d\u5236\u3002<\/li>
- \u6df1\u514b\u9686\uff1a\u9664\u4e86\u5bf9\u8c61\u672c\u8eab\u88ab\u590d\u5236\u5916\uff0c\u5bf9\u8c61\u6240\u5305\u542b\u7684\u6240\u6709\u6210\u5458\u53d8\u91cf\u4e5f\u5c06\u590d\u5236\u3002<\/li><\/ul>\n\n\n\n
Java Web<\/h3>\n\n\n\n64. JSP \u548c servlet \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
JSP \u662f servlet \u6280\u672f\u7684\u6269\u5c55\uff0c\u672c\u8d28\u4e0a\u5c31\u662f servlet \u7684\u7b80\u6613\u65b9\u5f0f\u3002servlet \u548c JSP \u6700\u4e3b\u8981\u7684\u4e0d\u540c\u70b9\u5728\u4e8e\uff0cservlet \u7684\u5e94\u7528\u903b\u8f91\u662f\u5728 Java \u6587\u4ef6\u4e2d\uff0c\u5e76\u4e14\u5b8c\u5168\u4ece\u8868\u793a\u5c42\u4e2d\u7684 html \u91cc\u5206\u79bb\u5f00\u6765\uff0c\u800c JSP \u7684\u60c5\u51b5\u662f Java \u548c html \u53ef\u4ee5\u7ec4\u5408\u6210\u4e00\u4e2a\u6269\u5c55\u540d\u4e3a JSP \u7684\u6587\u4ef6\u3002JSP \u4fa7\u91cd\u4e8e\u89c6\u56fe\uff0cservlet \u4e3b\u8981\u7528\u4e8e\u63a7\u5236\u903b\u8f91\u3002<\/p>\n\n\n\n
65. JSP \u6709\u54ea\u4e9b\u5185\u7f6e\u5bf9\u8c61\uff1f\u4f5c\u7528\u5206\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
JSP \u6709 9 \u5927\u5185\u7f6e\u5bf9\u8c61\uff1a<\/p>\n\n\n\n
- request\uff1a\u5c01\u88c5\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\uff0c\u5176\u4e2d\u5305\u542b\u6765\u81ea get \u6216 post \u8bf7\u6c42\u7684\u53c2\u6570\uff1b<\/li>
- response\uff1a\u5c01\u88c5\u670d\u52a1\u5668\u5bf9\u5ba2\u6237\u7aef\u7684\u54cd\u5e94\uff1b<\/li>
- pageContext\uff1a\u901a\u8fc7\u8be5\u5bf9\u8c61\u53ef\u4ee5\u83b7\u53d6\u5176\u4ed6\u5bf9\u8c61\uff1b<\/li>
- session\uff1a\u5c01\u88c5\u7528\u6237\u4f1a\u8bdd\u7684\u5bf9\u8c61\uff1b<\/li>
- application\uff1a\u5c01\u88c5\u670d\u52a1\u5668\u8fd0\u884c\u73af\u5883\u7684\u5bf9\u8c61\uff1b<\/li>
- out\uff1a\u8f93\u51fa\u670d\u52a1\u5668\u54cd\u5e94\u7684\u8f93\u51fa\u6d41\u5bf9\u8c61\uff1b<\/li>
- config\uff1aWeb \u5e94\u7528\u7684\u914d\u7f6e\u5bf9\u8c61\uff1b<\/li>
- page\uff1aJSP \u9875\u9762\u672c\u8eab\uff08\u76f8\u5f53\u4e8e Java \u7a0b\u5e8f\u4e2d\u7684 this\uff09\uff1b<\/li>
- exception\uff1a\u5c01\u88c5\u9875\u9762\u629b\u51fa\u5f02\u5e38\u7684\u5bf9\u8c61\u3002<\/li><\/ul>\n\n\n\n
66. \u8bf4\u4e00\u4e0b JSP \u7684 4 \u79cd\u4f5c\u7528\u57df\uff1f<\/h4>\n\n\n\n- page\uff1a\u4ee3\u8868\u4e0e\u4e00\u4e2a\u9875\u9762\u76f8\u5173\u7684\u5bf9\u8c61\u548c\u5c5e\u6027\u3002<\/li>
- request\uff1a\u4ee3\u8868\u4e0e\u5ba2\u6237\u7aef\u53d1\u51fa\u7684\u4e00\u4e2a\u8bf7\u6c42\u76f8\u5173\u7684\u5bf9\u8c61\u548c\u5c5e\u6027\u3002\u4e00\u4e2a\u8bf7\u6c42\u53ef\u80fd\u8de8\u8d8a\u591a\u4e2a\u9875\u9762\uff0c\u6d89\u53ca\u591a\u4e2a Web \u7ec4\u4ef6\uff1b\u9700\u8981\u5728\u9875\u9762\u663e\u793a\u7684\u4e34\u65f6\u6570\u636e\u53ef\u4ee5\u7f6e\u4e8e\u6b64\u4f5c\u7528\u57df\u3002<\/li>
- session\uff1a\u4ee3\u8868\u4e0e\u67d0\u4e2a\u7528\u6237\u4e0e\u670d\u52a1\u5668\u5efa\u7acb\u7684\u4e00\u6b21\u4f1a\u8bdd\u76f8\u5173\u7684\u5bf9\u8c61\u548c\u5c5e\u6027\u3002\u8ddf\u67d0\u4e2a\u7528\u6237\u76f8\u5173\u7684\u6570\u636e\u5e94\u8be5\u653e\u5728\u7528\u6237\u81ea\u5df1\u7684 session \u4e2d\u3002<\/li>
- application\uff1a\u4ee3\u8868\u4e0e\u6574\u4e2a Web \u5e94\u7528\u7a0b\u5e8f\u76f8\u5173\u7684\u5bf9\u8c61\u548c\u5c5e\u6027\uff0c\u5b83\u5b9e\u8d28\u4e0a\u662f\u8de8\u8d8a\u6574\u4e2a Web \u5e94\u7528\u7a0b\u5e8f\uff0c\u5305\u62ec\u591a\u4e2a\u9875\u9762\u3001\u8bf7\u6c42\u548c\u4f1a\u8bdd\u7684\u4e00\u4e2a\u5168\u5c40\u4f5c\u7528\u57df\u3002<\/li><\/ul>\n\n\n\n
67. session \u548c cookie \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- \u5b58\u50a8\u4f4d\u7f6e\u4e0d\u540c\uff1asession \u5b58\u50a8\u5728\u670d\u52a1\u5668\u7aef\uff1bcookie \u5b58\u50a8\u5728\u6d4f\u89c8\u5668\u7aef\u3002<\/li>
- \u5b89\u5168\u6027\u4e0d\u540c\uff1acookie \u5b89\u5168\u6027\u4e00\u822c\uff0c\u5728\u6d4f\u89c8\u5668\u5b58\u50a8\uff0c\u53ef\u4ee5\u88ab\u4f2a\u9020\u548c\u4fee\u6539\u3002<\/li>
- \u5bb9\u91cf\u548c\u4e2a\u6570\u9650\u5236\uff1acookie \u6709\u5bb9\u91cf\u9650\u5236\uff0c\u6bcf\u4e2a\u7ad9\u70b9\u4e0b\u7684 cookie \u4e5f\u6709\u4e2a\u6570\u9650\u5236\u3002<\/li>
- \u5b58\u50a8\u7684\u591a\u6837\u6027\uff1asession \u53ef\u4ee5\u5b58\u50a8\u5728 Redis \u4e2d\u3001\u6570\u636e\u5e93\u4e2d\u3001\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff1b\u800c cookie \u53ea\u80fd\u5b58\u50a8\u5728\u6d4f\u89c8\u5668\u4e2d\u3002<\/li><\/ul>\n\n\n\n
68. \u8bf4\u4e00\u4e0b session \u7684\u5de5\u4f5c\u539f\u7406\uff1f<\/h4>\n\n\n\n
session \u7684\u5de5\u4f5c\u539f\u7406\u662f\u5ba2\u6237\u7aef\u767b\u5f55\u5b8c\u6210\u4e4b\u540e\uff0c\u670d\u52a1\u5668\u4f1a\u521b\u5efa\u5bf9\u5e94\u7684 session\uff0csession \u521b\u5efa\u5b8c\u4e4b\u540e\uff0c\u4f1a\u628a session \u7684 id \u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\uff0c\u5ba2\u6237\u7aef\u518d\u5b58\u50a8\u5230\u6d4f\u89c8\u5668\u4e2d\u3002\u8fd9\u6837\u5ba2\u6237\u7aef\u6bcf\u6b21\u8bbf\u95ee\u670d\u52a1\u5668\u65f6\uff0c\u90fd\u4f1a\u5e26\u7740 sessionid\uff0c\u670d\u52a1\u5668\u62ff\u5230 sessionid \u4e4b\u540e\uff0c\u5728\u5185\u5b58\u627e\u5230\u4e0e\u4e4b\u5bf9\u5e94\u7684 session \u8fd9\u6837\u5c31\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\u4e86\u3002<\/p>\n\n\n\n
69. \u5982\u679c\u5ba2\u6237\u7aef\u7981\u6b62 cookie \u80fd\u5b9e\u73b0 session \u8fd8\u80fd\u7528\u5417\uff1f<\/h4>\n\n\n\n
\u53ef\u4ee5\u7528\uff0csession \u53ea\u662f\u4f9d\u8d56 cookie \u5b58\u50a8 sessionid\uff0c\u5982\u679c cookie \u88ab\u7981\u7528\u4e86\uff0c\u53ef\u4ee5\u4f7f\u7528 url \u4e2d\u6dfb\u52a0 sessionid \u7684\u65b9\u5f0f\u4fdd\u8bc1 session \u80fd\u6b63\u5e38\u4f7f\u7528\u3002<\/p>\n\n\n\n
70. spring mvc \u548c struts \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n- \u62e6\u622a\u7ea7\u522b\uff1astruts2 \u662f\u7c7b\u7ea7\u522b\u7684\u62e6\u622a\uff1bspring mvc \u662f\u65b9\u6cd5\u7ea7\u522b\u7684\u62e6\u622a\u3002<\/li>
- \u6570\u636e\u72ec\u7acb\u6027\uff1aspring mvc \u7684\u65b9\u6cd5\u4e4b\u95f4\u57fa\u672c\u4e0a\u72ec\u7acb\u7684\uff0c\u72ec\u4eab request \u548c response \u6570\u636e\uff0c\u8bf7\u6c42\u6570\u636e\u901a\u8fc7\u53c2\u6570\u83b7\u53d6\uff0c\u5904\u7406\u7ed3\u679c\u901a\u8fc7 ModelMap \u4ea4\u56de\u7ed9\u6846\u67b6\uff0c\u65b9\u6cd5\u4e4b\u95f4\u4e0d\u5171\u4eab\u53d8\u91cf\uff1b\u800c struts2 \u867d\u7136\u65b9\u6cd5\u4e4b\u95f4\u4e5f\u662f\u72ec\u7acb\u7684\uff0c\u4f46\u5176\u6240\u6709 action \u53d8\u91cf\u662f\u5171\u4eab\u7684\uff0c\u8fd9\u4e0d\u4f1a\u5f71\u54cd\u7a0b\u5e8f\u8fd0\u884c\uff0c\u5374\u7ed9\u6211\u4eec\u7f16\u7801\u548c\u8bfb\u7a0b\u5e8f\u65f6\u5e26\u6765\u4e86\u4e00\u5b9a\u7684\u9ebb\u70e6\u3002<\/li>
- \u62e6\u622a\u673a\u5236\uff1astruts2 \u6709\u4ee5\u81ea\u5df1\u7684 interceptor \u673a\u5236\uff0cspring mvc \u7528\u7684\u662f\u72ec\u7acb\u7684 aop \u65b9\u5f0f\uff0c\u8fd9\u6837\u5bfc\u81f4struts2 \u7684\u914d\u7f6e\u6587\u4ef6\u91cf\u6bd4 spring mvc \u5927\u3002<\/li>
- \u5bf9 ajax \u7684\u652f\u6301\uff1aspring mvc \u96c6\u6210\u4e86ajax\uff0c\u6240\u6709 ajax \u4f7f\u7528\u5f88\u65b9\u4fbf\uff0c\u53ea\u9700\u8981\u4e00\u4e2a\u6ce8\u89e3 @ResponseBody \u5c31\u53ef\u4ee5\u5b9e\u73b0\u4e86\uff1b\u800c struts2 \u4e00\u822c\u9700\u8981\u5b89\u88c5\u63d2\u4ef6\u6216\u8005\u81ea\u5df1\u5199\u4ee3\u7801\u624d\u884c\u3002<\/li><\/ul>\n\n\n\n
71. \u5982\u4f55\u907f\u514d SQL \u6ce8\u5165\uff1f<\/h4>\n\n\n\n- \u4f7f\u7528\u9884\u5904\u7406 PreparedStatement\u3002<\/li>
- \u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u8fc7\u6ee4\u6389\u5b57\u7b26\u4e2d\u7684\u7279\u6b8a\u5b57\u7b26\u3002<\/li><\/ul>\n\n\n\n
72. \u4ec0\u4e48\u662f XSS \u653b\u51fb\uff0c\u5982\u4f55\u907f\u514d\uff1f<\/h4>\n\n\n\n
XSS \u653b\u51fb\uff1a\u5373\u8de8\u7ad9\u811a\u672c\u653b\u51fb\uff0c\u5b83\u662f Web \u7a0b\u5e8f\u4e2d\u5e38\u89c1\u7684\u6f0f\u6d1e\u3002\u539f\u7406\u662f\u653b\u51fb\u8005\u5f80 Web \u9875\u9762\u91cc\u63d2\u5165\u6076\u610f\u7684\u811a\u672c\u4ee3\u7801\uff08css \u4ee3\u7801\u3001Javascript \u4ee3\u7801\u7b49\uff09\uff0c\u5f53\u7528\u6237\u6d4f\u89c8\u8be5\u9875\u9762\u65f6\uff0c\u5d4c\u5165\u5176\u4e2d\u7684\u811a\u672c\u4ee3\u7801\u4f1a\u88ab\u6267\u884c\uff0c\u4ece\u800c\u8fbe\u5230\u6076\u610f\u653b\u51fb\u7528\u6237\u7684\u76ee\u7684\uff0c\u5982\u76d7\u53d6\u7528\u6237 cookie\u3001\u7834\u574f\u9875\u9762\u7ed3\u6784\u3001\u91cd\u5b9a\u5411\u5230\u5176\u4ed6\u7f51\u7ad9\u7b49\u3002<\/p>\n\n\n\n
\u9884\u9632 XSS \u7684\u6838\u5fc3\u662f\u5fc5\u987b\u5bf9\u8f93\u5165\u7684\u6570\u636e\u505a\u8fc7\u6ee4\u5904\u7406\u3002<\/p>\n\n\n\n
73. \u4ec0\u4e48\u662f CSRF \u653b\u51fb\uff0c\u5982\u4f55\u907f\u514d\uff1f<\/h4>\n\n\n\n
CSRF\uff1aCross-Site Request Forgery\uff08\u4e2d\u6587\uff1a\u8de8\u7ad9\u8bf7\u6c42\u4f2a\u9020\uff09\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\u653b\u51fb\u8005\u76d7\u7528\u4e86\u4f60\u7684\u8eab\u4efd\uff0c\u4ee5\u4f60\u7684\u540d\u4e49\u53d1\u9001\u6076\u610f\u8bf7\u6c42\uff0c\u6bd4\u5982\uff1a\u4ee5\u4f60\u540d\u4e49\u53d1\u9001\u90ae\u4ef6\u3001\u53d1\u6d88\u606f\u3001\u8d2d\u4e70\u5546\u54c1\uff0c\u865a\u62df\u8d27\u5e01\u8f6c\u8d26\u7b49\u3002<\/p>\n\n\n\n
\u9632\u5fa1\u624b\u6bb5\uff1a<\/p>\n\n\n\n
- \u9a8c\u8bc1\u8bf7\u6c42\u6765\u6e90\u5730\u5740\uff1b<\/li>
- \u5173\u952e\u64cd\u4f5c\u6dfb\u52a0\u9a8c\u8bc1\u7801\uff1b<\/li>
- \u5728\u8bf7\u6c42\u5730\u5740\u6dfb\u52a0 token \u5e76\u9a8c\u8bc1\u3002<\/li><\/ul>\n\n\n\n
\u5f02\u5e38<\/h3>\n\n\n\n74. throw \u548c throws \u7684\u533a\u522b\uff1f<\/h4>\n\n\n\n- throw\uff1a\u662f\u771f\u5b9e\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38\u3002<\/li>
- throws\uff1a\u662f\u58f0\u660e\u53ef\u80fd\u4f1a\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38\u3002<\/li><\/ul>\n\n\n\n
75. final\u3001finally\u3001finalize \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- final\uff1a\u662f\u4fee\u9970\u7b26\uff0c\u5982\u679c\u4fee\u9970\u7c7b\uff0c\u6b64\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\uff1b\u5982\u679c\u4fee\u9970\u65b9\u6cd5\u548c\u53d8\u91cf\uff0c\u5219\u8868\u793a\u6b64\u65b9\u6cd5\u548c\u6b64\u53d8\u91cf\u4e0d\u80fd\u5728\u88ab\u6539\u53d8\uff0c\u53ea\u80fd\u4f7f\u7528\u3002<\/li>
- finally\uff1a\u662f try{} catch{} finally{} \u6700\u540e\u4e00\u90e8\u5206\uff0c\u8868\u793a\u4e0d\u8bba\u53d1\u751f\u4efb\u4f55\u60c5\u51b5\u90fd\u4f1a\u6267\u884c\uff0cfinally \u90e8\u5206\u53ef\u4ee5\u7701\u7565\uff0c\u4f46\u5982\u679c finally \u90e8\u5206\u5b58\u5728\uff0c\u5219\u4e00\u5b9a\u4f1a\u6267\u884c finally \u91cc\u9762\u7684\u4ee3\u7801\u3002<\/li>
- finalize\uff1a \u662f Object \u7c7b\u7684\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5728\u5783\u573e\u6536\u96c6\u5668\u6267\u884c\u7684\u65f6\u5019\u4f1a\u8c03\u7528\u88ab\u56de\u6536\u5bf9\u8c61\u7684\u6b64\u65b9\u6cd5\u3002<\/li><\/ul>\n\n\n\n
76. try-catch-finally \u4e2d\u54ea\u4e2a\u90e8\u5206\u53ef\u4ee5\u7701\u7565\uff1f<\/h4>\n\n\n\n
try-catch-finally \u5176\u4e2d catch \u548c finally \u90fd\u53ef\u4ee5\u88ab\u7701\u7565\uff0c\u4f46\u662f\u4e0d\u80fd\u540c\u65f6\u7701\u7565\uff0c\u4e5f\u5c31\u662f\u8bf4\u6709 try \u7684\u65f6\u5019\uff0c\u5fc5\u987b\u540e\u9762\u8ddf\u4e00\u4e2a catch \u6216\u8005 finally\u3002<\/p>\n\n\n\n
77. try-catch-finally \u4e2d\uff0c\u5982\u679c catch \u4e2d return \u4e86\uff0cfinally \u8fd8\u4f1a\u6267\u884c\u5417\uff1f<\/h4>\n\n\n\n
finally \u4e00\u5b9a\u4f1a\u6267\u884c\uff0c\u5373\u4f7f\u662f catch \u4e2d return \u4e86\uff0ccatch \u4e2d\u7684 return \u4f1a\u7b49 finally \u4e2d\u7684\u4ee3\u7801\u6267\u884c\u5b8c\u4e4b\u540e\uff0c\u624d\u4f1a\u6267\u884c\u3002<\/p>\n\n\n\n
78. \u5e38\u89c1\u7684\u5f02\u5e38\u7c7b\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n- NullPointerException \u7a7a\u6307\u9488\u5f02\u5e38<\/li>
- ClassNotFoundException \u6307\u5b9a\u7c7b\u4e0d\u5b58\u5728<\/li>
- NumberFormatException \u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u5b57\u5f02\u5e38<\/li>
- IndexOutOfBoundsException \u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u5f02\u5e38<\/li>
- ClassCastException \u6570\u636e\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38<\/li>
- FileNotFoundException \u6587\u4ef6\u672a\u627e\u5230\u5f02\u5e38<\/li>
- NoSuchMethodException \u65b9\u6cd5\u4e0d\u5b58\u5728\u5f02\u5e38<\/li>
- IOException IO \u5f02\u5e38<\/li>
- SocketException Socket \u5f02\u5e38<\/li><\/ul>\n\n\n\n
\u7f51\u7edc<\/h3>\n\n\n\n79. http \u54cd\u5e94\u7801 301 \u548c 302 \u4ee3\u8868\u7684\u662f\u4ec0\u4e48\uff1f\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
301\uff1a\u6c38\u4e45\u91cd\u5b9a\u5411\u3002<\/p>\n\n\n\n
302\uff1a\u6682\u65f6\u91cd\u5b9a\u5411\u3002<\/p>\n\n\n\n
\u5b83\u4eec\u7684\u533a\u522b\u662f\uff0c301 \u5bf9\u641c\u7d22\u5f15\u64ce\u4f18\u5316\uff08SEO\uff09\u66f4\u52a0\u6709\u5229\uff1b302 \u6709\u88ab\u63d0\u793a\u4e3a\u7f51\u7edc\u62e6\u622a\u7684\u98ce\u9669\u3002<\/p>\n\n\n\n
80. forward \u548c redirect \u7684\u533a\u522b\uff1f<\/h4>\n\n\n\n
forward \u662f\u8f6c\u53d1 \u548c redirect \u662f\u91cd\u5b9a\u5411\uff1a<\/p>\n\n\n\n
- \u5730\u5740\u680f url \u663e\u793a\uff1afoward url \u4e0d\u4f1a\u53d1\u751f\u6539\u53d8\uff0credirect url \u4f1a\u53d1\u751f\u6539\u53d8\uff1b<\/li>
- \u6570\u636e\u5171\u4eab\uff1aforward \u53ef\u4ee5\u5171\u4eab request \u91cc\u7684\u6570\u636e\uff0credirect \u4e0d\u80fd\u5171\u4eab\uff1b<\/li>
- \u6548\u7387\uff1aforward \u6bd4 redirect \u6548\u7387\u9ad8\u3002<\/li><\/ul>\n\n\n\n
81. \u7b80\u8ff0 tcp \u548c udp\u7684\u533a\u522b\uff1f<\/h4>\n\n\n\n
tcp \u548c udp \u662f OSI \u6a21\u578b\u4e2d\u7684\u8fd0\u8f93\u5c42\u4e2d\u7684\u534f\u8bae\u3002tcp \u63d0\u4f9b\u53ef\u9760\u7684\u901a\u4fe1\u4f20\u8f93\uff0c\u800c udp \u5219\u5e38\u88ab\u7528\u4e8e\u8ba9\u5e7f\u64ad\u548c\u7ec6\u8282\u63a7\u5236\u4ea4\u7ed9\u5e94\u7528\u7684\u901a\u4fe1\u4f20\u8f93\u3002<\/p>\n\n\n\n
\u4e24\u8005\u7684\u533a\u522b\u5927\u81f4\u5982\u4e0b\uff1a<\/p>\n\n\n\n
- tcp \u9762\u5411\u8fde\u63a5\uff0cudp \u9762\u5411\u975e\u8fde\u63a5\u5373\u53d1\u9001\u6570\u636e\u524d\u4e0d\u9700\u8981\u5efa\u7acb\u94fe\u63a5\uff1b<\/li>
- tcp \u63d0\u4f9b\u53ef\u9760\u7684\u670d\u52a1\uff08\u6570\u636e\u4f20\u8f93\uff09\uff0cudp \u65e0\u6cd5\u4fdd\u8bc1\uff1b<\/li>
- tcp \u9762\u5411\u5b57\u8282\u6d41\uff0cudp \u9762\u5411\u62a5\u6587\uff1b<\/li>
- tcp \u6570\u636e\u4f20\u8f93\u6162\uff0cudp \u6570\u636e\u4f20\u8f93\u5feb\uff1b<\/li><\/ul>\n\n\n\n
82. tcp \u4e3a\u4ec0\u4e48\u8981\u4e09\u6b21\u63e1\u624b\uff0c\u4e24\u6b21\u4e0d\u884c\u5417\uff1f\u4e3a\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
\u5982\u679c\u91c7\u7528\u4e24\u6b21\u63e1\u624b\uff0c\u90a3\u4e48\u53ea\u8981\u670d\u52a1\u5668\u53d1\u51fa\u786e\u8ba4\u6570\u636e\u5305\u5c31\u4f1a\u5efa\u7acb\u8fde\u63a5\uff0c\u4f46\u7531\u4e8e\u5ba2\u6237\u7aef\u6b64\u65f6\u5e76\u672a\u54cd\u5e94\u670d\u52a1\u5668\u7aef\u7684\u8bf7\u6c42\uff0c\u90a3\u6b64\u65f6\u670d\u52a1\u5668\u7aef\u5c31\u4f1a\u4e00\u76f4\u5728\u7b49\u5f85\u5ba2\u6237\u7aef\uff0c\u8fd9\u6837\u670d\u52a1\u5668\u7aef\u5c31\u767d\u767d\u6d6a\u8d39\u4e86\u4e00\u5b9a\u7684\u8d44\u6e90\u3002\u82e5\u91c7\u7528\u4e09\u6b21\u63e1\u624b\uff0c\u670d\u52a1\u5668\u7aef\u6ca1\u6709\u6536\u5230\u6765\u81ea\u5ba2\u6237\u7aef\u7684\u518d\u6b64\u786e\u8ba4\uff0c\u5219\u5c31\u4f1a\u77e5\u9053\u5ba2\u6237\u7aef\u5e76\u6ca1\u6709\u8981\u6c42\u5efa\u7acb\u8bf7\u6c42\uff0c\u5c31\u4e0d\u4f1a\u6d6a\u8d39\u670d\u52a1\u5668\u7684\u8d44\u6e90\u3002<\/p>\n\n\n\n
83. \u8bf4\u4e00\u4e0b tcp \u7c98\u5305\u662f\u600e\u4e48\u4ea7\u751f\u7684\uff1f<\/h4>\n\n\n\n
tcp \u7c98\u5305\u53ef\u80fd\u53d1\u751f\u5728\u53d1\u9001\u7aef\u6216\u8005\u63a5\u6536\u7aef\uff0c\u5206\u522b\u6765\u770b\u4e24\u7aef\u5404\u79cd\u4ea7\u751f\u7c98\u5305\u7684\u539f\u56e0\uff1a<\/p>\n\n\n\n
- \u53d1\u9001\u7aef\u7c98\u5305\uff1a\u53d1\u9001\u7aef\u9700\u8981\u7b49\u7f13\u51b2\u533a\u6ee1\u624d\u53d1\u9001\u51fa\u53bb\uff0c\u9020\u6210\u7c98\u5305\uff1b<\/li>
- \u63a5\u6536\u65b9\u7c98\u5305\uff1a\u63a5\u6536\u65b9\u4e0d\u53ca\u65f6\u63a5\u6536\u7f13\u51b2\u533a\u7684\u5305\uff0c\u9020\u6210\u591a\u4e2a\u5305\u63a5\u6536\u3002<\/li><\/ul>\n\n\n\n
84. OSI \u7684\u4e03\u5c42\u6a21\u578b\u90fd\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n- \u7269\u7406\u5c42\uff1a\u5229\u7528\u4f20\u8f93\u4ecb\u8d28\u4e3a\u6570\u636e\u94fe\u8def\u5c42\u63d0\u4f9b\u7269\u7406\u8fde\u63a5\uff0c\u5b9e\u73b0\u6bd4\u7279\u6d41\u7684\u900f\u660e\u4f20\u8f93\u3002<\/li>
- \u6570\u636e\u94fe\u8def\u5c42\uff1a\u8d1f\u8d23\u5efa\u7acb\u548c\u7ba1\u7406\u8282\u70b9\u95f4\u7684\u94fe\u8def\u3002<\/li>
- \u7f51\u7edc\u5c42\uff1a\u901a\u8fc7\u8def\u7531\u9009\u62e9\u7b97\u6cd5\uff0c\u4e3a\u62a5\u6587\u6216\u5206\u7ec4\u901a\u8fc7\u901a\u4fe1\u5b50\u7f51\u9009\u62e9\u6700\u9002\u5f53\u7684\u8def\u5f84\u3002<\/li>
- \u4f20\u8f93\u5c42\uff1a\u5411\u7528\u6237\u63d0\u4f9b\u53ef\u9760\u7684\u7aef\u5230\u7aef\u7684\u5dee\u9519\u548c\u6d41\u91cf\u63a7\u5236\uff0c\u4fdd\u8bc1\u62a5\u6587\u7684\u6b63\u786e\u4f20\u8f93\u3002<\/li>
- \u4f1a\u8bdd\u5c42\uff1a\u5411\u4e24\u4e2a\u5b9e\u4f53\u7684\u8868\u793a\u5c42\u63d0\u4f9b\u5efa\u7acb\u548c\u4f7f\u7528\u8fde\u63a5\u7684\u65b9\u6cd5\u3002<\/li>
- \u8868\u793a\u5c42\uff1a\u5904\u7406\u7528\u6237\u4fe1\u606f\u7684\u8868\u793a\u95ee\u9898\uff0c\u5982\u7f16\u7801\u3001\u6570\u636e\u683c\u5f0f\u8f6c\u6362\u548c\u52a0\u5bc6\u89e3\u5bc6\u7b49\u3002<\/li>
- \u5e94\u7528\u5c42\uff1a\u76f4\u63a5\u5411\u7528\u6237\u63d0\u4f9b\u670d\u52a1\uff0c\u5b8c\u6210\u7528\u6237\u5e0c\u671b\u5728\u7f51\u7edc\u4e0a\u5b8c\u6210\u7684\u5404\u79cd\u5de5\u4f5c\u3002<\/li><\/ul>\n\n\n\n
85. get \u548c post \u8bf7\u6c42\u6709\u54ea\u4e9b\u533a\u522b\uff1f<\/h4>\n\n\n\n- get \u8bf7\u6c42\u4f1a\u88ab\u6d4f\u89c8\u5668\u4e3b\u52a8\u7f13\u5b58\uff0c\u800c post \u4e0d\u4f1a\u3002<\/li>
- get \u4f20\u9012\u53c2\u6570\u6709\u5927\u5c0f\u9650\u5236\uff0c\u800c post \u6ca1\u6709\u3002<\/li>
- post \u53c2\u6570\u4f20\u8f93\u66f4\u5b89\u5168\uff0cget \u7684\u53c2\u6570\u4f1a\u660e\u6587\u9650\u5236\u5728 url \u4e0a\uff0cpost \u4e0d\u4f1a\u3002<\/li><\/ul>\n\n\n\n
86. \u5982\u4f55\u5b9e\u73b0\u8de8\u57df\uff1f<\/h4>\n\n\n\n
\u5b9e\u73b0\u8de8\u57df\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6848\uff1a<\/p>\n\n\n\n
- \u670d\u52a1\u5668\u7aef\u8fd0\u884c\u8de8\u57df \u8bbe\u7f6e CORS \u7b49\u4e8e *\uff1b<\/li>
- \u5728\u5355\u4e2a\u63a5\u53e3\u4f7f\u7528\u6ce8\u89e3 @CrossOrigin \u8fd0\u884c\u8de8\u57df\uff1b<\/li>
- \u4f7f\u7528 jsonp \u8de8\u57df\uff1b<\/li><\/ul>\n\n\n\n
87. \u8bf4\u4e00\u4e0b JSONP \u5b9e\u73b0\u539f\u7406\uff1f<\/h4>\n\n\n\n
jsonp\uff1aJSON with Padding\uff0c\u5b83\u662f\u5229\u7528script\u6807\u7b7e\u7684 src \u8fde\u63a5\u53ef\u4ee5\u8bbf\u95ee\u4e0d\u540c\u6e90\u7684\u7279\u6027\uff0c\u52a0\u8f7d\u8fdc\u7a0b\u8fd4\u56de\u7684\u201cJS \u51fd\u6570\u201d\u6765\u6267\u884c\u7684\u3002<\/p>\n\n\n\n
\u8bbe\u8ba1\u6a21\u5f0f<\/h3>\n\n\n\n88. \u8bf4\u4e00\u4e0b\u4f60\u719f\u6089\u7684\u8bbe\u8ba1\u6a21\u5f0f\uff1f<\/h4>\n\n\n\n- \u5355\u4f8b\u6a21\u5f0f\uff1a\u4fdd\u8bc1\u88ab\u521b\u5efa\u4e00\u6b21\uff0c\u8282\u7701\u7cfb\u7edf\u5f00\u9500\u3002<\/li>
- \u5de5\u5382\u6a21\u5f0f\uff08\u7b80\u5355\u5de5\u5382\u3001\u62bd\u8c61\u5de5\u5382\uff09\uff1a\u89e3\u8026\u4ee3\u7801\u3002<\/li>
- \u89c2\u5bdf\u8005\u6a21\u5f0f\uff1a\u5b9a\u4e49\u4e86\u5bf9\u8c61\u4e4b\u95f4\u7684\u4e00\u5bf9\u591a\u7684\u4f9d\u8d56\uff0c\u8fd9\u6837\u4e00\u6765\uff0c\u5f53\u4e00\u4e2a\u5bf9\u8c61\u6539\u53d8\u65f6\uff0c\u5b83\u7684\u6240\u6709\u7684\u4f9d\u8d56\u8005\u90fd\u4f1a\u6536\u5230\u901a\u77e5\u5e76\u81ea\u52a8\u66f4\u65b0\u3002<\/li>
- \u5916\u89c2\u6a21\u5f0f\uff1a\u63d0\u4f9b\u4e00\u4e2a\u7edf\u4e00\u7684\u63a5\u53e3\uff0c\u7528\u6765\u8bbf\u95ee\u5b50\u7cfb\u7edf\u4e2d\u7684\u4e00\u7fa4\u63a5\u53e3\uff0c\u5916\u89c2\u5b9a\u4e49\u4e86\u4e00\u4e2a\u9ad8\u5c42\u7684\u63a5\u53e3\uff0c\u8ba9\u5b50\u7cfb\u7edf\u66f4\u5bb9\u6613\u4f7f\u7528\u3002<\/li>
- \u6a21\u7248\u65b9\u6cd5\u6a21\u5f0f\uff1a\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7b97\u6cd5\u7684\u9aa8\u67b6\uff0c\u800c\u5c06\u4e00\u4e9b\u6b65\u9aa4\u5ef6\u8fdf\u5230\u5b50\u7c7b\u4e2d\uff0c\u6a21\u7248\u65b9\u6cd5\u4f7f\u5f97\u5b50\u7c7b\u53ef\u4ee5\u5728\u4e0d\u6539\u53d8\u7b97\u6cd5\u7ed3\u6784\u7684\u60c5\u51b5\u4e0b\uff0c\u91cd\u65b0\u5b9a\u4e49\u7b97\u6cd5\u7684\u6b65\u9aa4\u3002<\/li>
- \u72b6\u6001\u6a21\u5f0f\uff1a\u5141\u8bb8\u5bf9\u8c61\u5728\u5185\u90e8\u72b6\u6001\u6539\u53d8\u65f6\u6539\u53d8\u5b83\u7684\u884c\u4e3a\uff0c\u5bf9\u8c61\u770b\u8d77\u6765\u597d\u50cf\u4fee\u6539\u4e86\u5b83\u7684\u7c7b\u3002<\/li><\/ul>\n\n\n\n
89. \u7b80\u5355\u5de5\u5382\u548c\u62bd\u8c61\u5de5\u5382\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n- \u7b80\u5355\u5de5\u5382\uff1a\u7528\u6765\u751f\u4ea7\u540c\u4e00\u7b49\u7ea7\u7ed3\u6784\u4e2d\u7684\u4efb\u610f\u4ea7\u54c1\uff0c\u5bf9\u4e8e\u589e\u52a0\u65b0\u7684\u4ea7\u54c1\uff0c\u65e0\u80fd\u4e3a\u529b\u3002<\/li>
- \u5de5\u5382\u65b9\u6cd5\uff1a\u7528\u6765\u751f\u4ea7\u540c\u4e00\u7b49\u7ea7\u7ed3\u6784\u4e2d\u7684\u56fa\u5b9a\u4ea7\u54c1\uff0c\u652f\u6301\u589e\u52a0\u4efb\u610f\u4ea7\u54c1\u3002<\/li>
- \u62bd\u8c61\u5de5\u5382\uff1a\u7528\u6765\u751f\u4ea7\u4e0d\u540c\u4ea7\u54c1\u65cf\u7684\u5168\u90e8\u4ea7\u54c1\uff0c\u5bf9\u4e8e\u589e\u52a0\u65b0\u7684\u4ea7\u54c1\uff0c\u65e0\u80fd\u4e3a\u529b\uff1b\u652f\u6301\u589e\u52a0\u4ea7\u54c1\u65cf\u3002<\/li><\/ul>\n\n\n\n
Spring\/Spring MVC<\/h3>\n\n\n\n90. \u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528 spring\uff1f<\/h4>\n\n\n\n- spring \u63d0\u4f9b ioc \u6280\u672f\uff0c\u5bb9\u5668\u4f1a\u5e2e\u4f60\u7ba1\u7406\u4f9d\u8d56\u7684\u5bf9\u8c61\uff0c\u4ece\u800c\u4e0d\u9700\u8981\u81ea\u5df1\u521b\u5efa\u548c\u7ba1\u7406\u4f9d\u8d56\u5bf9\u8c61\u4e86\uff0c\u66f4\u8f7b\u677e\u7684\u5b9e\u73b0\u4e86\u7a0b\u5e8f\u7684\u89e3\u8026\u3002<\/li>
- spring \u63d0\u4f9b\u4e86\u4e8b\u52a1\u652f\u6301\uff0c\u4f7f\u5f97\u4e8b\u52a1\u64cd\u4f5c\u53d8\u7684\u66f4\u52a0\u65b9\u4fbf\u3002<\/li>
- spring \u63d0\u4f9b\u4e86\u9762\u5411\u5207\u7247\u7f16\u7a0b\uff0c\u8fd9\u6837\u53ef\u4ee5\u66f4\u65b9\u4fbf\u7684\u5904\u7406\u67d0\u4e00\u7c7b\u7684\u95ee\u9898\u3002<\/li>
- \u66f4\u65b9\u4fbf\u7684\u6846\u67b6\u96c6\u6210\uff0cspring \u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u96c6\u6210\u5176\u4ed6\u6846\u67b6\uff0c\u6bd4\u5982 MyBatis\u3001hibernate \u7b49\u3002<\/li><\/ul>\n\n\n\n
91. \u89e3\u91ca\u4e00\u4e0b\u4ec0\u4e48\u662f aop\uff1f<\/h4>\n\n\n\n
aop \u662f\u9762\u5411\u5207\u9762\u7f16\u7a0b\uff0c\u901a\u8fc7\u9884\u7f16\u8bd1\u65b9\u5f0f\u548c\u8fd0\u884c\u671f\u52a8\u6001\u4ee3\u7406\u5b9e\u73b0\u7a0b\u5e8f\u529f\u80fd\u7684\u7edf\u4e00\u7ef4\u62a4\u7684\u4e00\u79cd\u6280\u672f\u3002<\/p>\n\n\n\n
\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u7edf\u4e00\u5904\u7406\u67d0\u4e00\u201c\u5207\u9762\u201d\uff08\u7c7b\uff09\u7684\u95ee\u9898\u7684\u7f16\u7a0b\u601d\u60f3\uff0c\u6bd4\u5982\u7edf\u4e00\u5904\u7406\u65e5\u5fd7\u3001\u5f02\u5e38\u7b49\u3002<\/p>\n\n\n\n
92. \u89e3\u91ca\u4e00\u4e0b\u4ec0\u4e48\u662f ioc\uff1f<\/h4>\n\n\n\n
ioc\uff1aInversionof Control\uff08\u4e2d\u6587\uff1a\u63a7\u5236\u53cd\u8f6c\uff09\u662f spring \u7684\u6838\u5fc3\uff0c\u5bf9\u4e8e spring \u6846\u67b6\u6765\u8bf4\uff0c\u5c31\u662f\u7531 spring \u6765\u8d1f\u8d23\u63a7\u5236\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u548c\u5bf9\u8c61\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n\n\n\n
\u7b80\u5355\u6765\u8bf4\uff0c\u63a7\u5236\u6307\u7684\u662f\u5f53\u524d\u5bf9\u8c61\u5bf9\u5185\u90e8\u6210\u5458\u7684\u63a7\u5236\u6743\uff1b\u63a7\u5236\u53cd\u8f6c\u6307\u7684\u662f\uff0c\u8fd9\u79cd\u63a7\u5236\u6743\u4e0d\u7531\u5f53\u524d\u5bf9\u8c61\u7ba1\u7406\u4e86\uff0c\u7531\u5176\u4ed6\uff08\u7c7b,\u7b2c\u4e09\u65b9\u5bb9\u5668\uff09\u6765\u7ba1\u7406\u3002<\/p>\n\n\n\n
93. spring \u6709\u54ea\u4e9b\u4e3b\u8981\u6a21\u5757\uff1f<\/h4>\n\n\n\n- spring core\uff1a\u6846\u67b6\u7684\u6700\u57fa\u7840\u90e8\u5206\uff0c\u63d0\u4f9b ioc \u548c\u4f9d\u8d56\u6ce8\u5165\u7279\u6027\u3002<\/li>
- spring context\uff1a\u6784\u5efa\u4e8e core \u5c01\u88c5\u5305\u57fa\u7840\u4e0a\u7684 context \u5c01\u88c5\u5305\uff0c\u63d0\u4f9b\u4e86\u4e00\u79cd\u6846\u67b6\u5f0f\u7684\u5bf9\u8c61\u8bbf\u95ee\u65b9\u6cd5\u3002<\/li>
- spring dao\uff1aData Access Object \u63d0\u4f9b\u4e86JDBC\u7684\u62bd\u8c61\u5c42\u3002<\/li>
- spring aop\uff1a\u63d0\u4f9b\u4e86\u9762\u5411\u5207\u9762\u7684\u7f16\u7a0b\u5b9e\u73b0\uff0c\u8ba9\u4f60\u53ef\u4ee5\u81ea\u5b9a\u4e49\u62e6\u622a\u5668\u3001\u5207\u70b9\u7b49\u3002<\/li>
- spring Web\uff1a\u63d0\u4f9b\u4e86\u9488\u5bf9 Web \u5f00\u53d1\u7684\u96c6\u6210\u7279\u6027\uff0c\u4f8b\u5982\u6587\u4ef6\u4e0a\u4f20\uff0c\u5229\u7528 servlet listeners \u8fdb\u884c ioc \u5bb9\u5668\u521d\u59cb\u5316\u548c\u9488\u5bf9 Web \u7684 ApplicationContext\u3002<\/li>
- spring Web mvc\uff1aspring \u4e2d\u7684 mvc \u5c01\u88c5\u5305\u63d0\u4f9b\u4e86 Web \u5e94\u7528\u7684 Model-View-Controller\uff08MVC\uff09\u7684\u5b9e\u73b0\u3002<\/li><\/ul>\n\n\n\n
94. spring \u5e38\u7528\u7684\u6ce8\u5165\u65b9\u5f0f\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n- setter \u5c5e\u6027\u6ce8\u5165<\/li>
- \u6784\u9020\u65b9\u6cd5\u6ce8\u5165<\/li>
- \u6ce8\u89e3\u65b9\u5f0f\u6ce8\u5165<\/li><\/ul>\n\n\n\n
95. spring \u4e2d\u7684 bean \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u5417\uff1f<\/h4>\n\n\n\n
spring \u4e2d\u7684 bean \u9ed8\u8ba4\u662f\u5355\u4f8b\u6a21\u5f0f\uff0cspring \u6846\u67b6\u5e76\u6ca1\u6709\u5bf9\u5355\u4f8b bean \u8fdb\u884c\u591a\u7ebf\u7a0b\u7684\u5c01\u88c5\u5904\u7406\u3002<\/p>\n\n\n\n
\u5b9e\u9645\u4e0a\u5927\u90e8\u5206\u65f6\u5019 spring bean \u65e0\u72b6\u6001\u7684\uff08\u6bd4\u5982 dao \u7c7b\uff09\uff0c\u6240\u6709\u67d0\u79cd\u7a0b\u5ea6\u4e0a\u6765\u8bf4 bean \u4e5f\u662f\u5b89\u5168\u7684\uff0c\u4f46\u5982\u679c bean \u6709\u72b6\u6001\u7684\u8bdd\uff08\u6bd4\u5982 view model \u5bf9\u8c61\uff09\uff0c\u90a3\u5c31\u8981\u5f00\u53d1\u8005\u81ea\u5df1\u53bb\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u4e86\uff0c\u6700\u7b80\u5355\u7684\u5c31\u662f\u6539\u53d8 bean \u7684\u4f5c\u7528\u57df\uff0c\u628a\u201csingleton\u201d\u53d8\u66f4\u4e3a\u201cprototype\u201d\uff0c\u8fd9\u6837\u8bf7\u6c42 bean \u76f8\u5f53\u4e8e new Bean()\u4e86\uff0c\u6240\u4ee5\u5c31\u53ef\u4ee5\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u4e86\u3002<\/p>\n\n\n\n
- \u6709\u72b6\u6001\u5c31\u662f\u6709\u6570\u636e\u5b58\u50a8\u529f\u80fd\u3002<\/li>
- \u65e0\u72b6\u6001\u5c31\u662f\u4e0d\u4f1a\u4fdd\u5b58\u6570\u636e\u3002<\/li><\/ul>\n\n\n\n
96. spring \u652f\u6301\u51e0\u79cd bean \u7684\u4f5c\u7528\u57df\uff1f<\/h4>\n\n\n\n
spring \u652f\u6301 5 \u79cd\u4f5c\u7528\u57df\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
- singleton\uff1aspring ioc \u5bb9\u5668\u4e2d\u53ea\u5b58\u5728\u4e00\u4e2a bean \u5b9e\u4f8b\uff0cbean \u4ee5\u5355\u4f8b\u6a21\u5f0f\u5b58\u5728\uff0c\u662f\u7cfb\u7edf\u9ed8\u8ba4\u503c\uff1b<\/li>
- prototype\uff1a\u6bcf\u6b21\u4ece\u5bb9\u5668\u8c03\u7528 bean \u65f6\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u793a\u4f8b\uff0c\u65e2\u6bcf\u6b21 getBean()\u76f8\u5f53\u4e8e\u6267\u884c new Bean()\u64cd\u4f5c\uff1b<\/li>
- Web \u73af\u5883\u4e0b\u7684\u4f5c\u7528\u57df\uff1a<\/li>
- request\uff1a\u6bcf\u6b21 http \u8bf7\u6c42\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a bean\uff1b<\/li>
- session\uff1a\u540c\u4e00\u4e2a http session \u5171\u4eab\u4e00\u4e2a bean \u5b9e\u4f8b\uff1b<\/li>
- global-session\uff1a\u7528\u4e8e portlet \u5bb9\u5668\uff0c\u56e0\u4e3a\u6bcf\u4e2a portlet \u6709\u5355\u72ec\u7684 session\uff0cglobalsession \u63d0\u4f9b\u4e00\u4e2a\u5168\u5c40\u6027\u7684 http session\u3002<\/li><\/ul>\n\n\n\n
\u300c\u6ce8\u610f\uff1a\u300d<\/strong> \u4f7f\u7528 prototype \u4f5c\u7528\u57df\u9700\u8981\u614e\u91cd\u7684\u601d\u8003\uff0c\u56e0\u4e3a\u9891\u7e41\u521b\u5efa\u548c\u9500\u6bc1 bean \u4f1a\u5e26\u6765\u5f88\u5927\u7684\u6027\u80fd\u5f00\u9500\u3002<\/p>\n\n\n\n97. spring \u81ea\u52a8\u88c5\u914d bean \u6709\u54ea\u4e9b\u65b9\u5f0f\uff1f<\/h4>\n\n\n\n- no\uff1a\u9ed8\u8ba4\u503c\uff0c\u8868\u793a\u6ca1\u6709\u81ea\u52a8\u88c5\u914d\uff0c\u5e94\u4f7f\u7528\u663e\u5f0f bean \u5f15\u7528\u8fdb\u884c\u88c5\u914d\u3002<\/li>
- byName\uff1a\u5b83\u6839\u636e bean \u7684\u540d\u79f0\u6ce8\u5165\u5bf9\u8c61\u4f9d\u8d56\u9879\u3002<\/li>
- byType\uff1a\u5b83\u6839\u636e\u7c7b\u578b\u6ce8\u5165\u5bf9\u8c61\u4f9d\u8d56\u9879\u3002<\/li>
- \u6784\u9020\u51fd\u6570\uff1a\u901a\u8fc7\u6784\u9020\u51fd\u6570\u6765\u6ce8\u5165\u4f9d\u8d56\u9879\uff0c\u9700\u8981\u8bbe\u7f6e\u5927\u91cf\u7684\u53c2\u6570\u3002<\/li>
- autodetect\uff1a\u5bb9\u5668\u9996\u5148\u901a\u8fc7\u6784\u9020\u51fd\u6570\u4f7f\u7528 autowire \u88c5\u914d\uff0c\u5982\u679c\u4e0d\u80fd\uff0c\u5219\u901a\u8fc7 byType \u81ea\u52a8\u88c5\u914d\u3002<\/li><\/ul>\n\n\n\n
98. spring \u4e8b\u52a1\u5b9e\u73b0\u65b9\u5f0f\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n- \u58f0\u660e\u5f0f\u4e8b\u52a1\uff1a\u58f0\u660e\u5f0f\u4e8b\u52a1\u4e5f\u6709\u4e24\u79cd\u5b9e\u73b0\u65b9\u5f0f\uff0c\u57fa\u4e8e xml \u914d\u7f6e\u6587\u4ef6\u7684\u65b9\u5f0f\u548c\u6ce8\u89e3\u65b9\u5f0f\uff08\u5728\u7c7b\u4e0a\u6dfb\u52a0 @Transaction \u6ce8\u89e3\uff09\u3002<\/li>
- \u7f16\u7801\u65b9\u5f0f\uff1a\u63d0\u4f9b\u7f16\u7801\u7684\u5f62\u5f0f\u7ba1\u7406\u548c\u7ef4\u62a4\u4e8b\u52a1\u3002<\/li><\/ul>\n\n\n\n
99. \u8bf4\u4e00\u4e0b spring \u7684\u4e8b\u52a1\u9694\u79bb\uff1f<\/h4>\n\n\n\n
spring \u6709\u4e94\u5927\u9694\u79bb\u7ea7\u522b\uff0c\u9ed8\u8ba4\u503c\u4e3a ISOLATION_DEFAULT\uff08\u4f7f\u7528\u6570\u636e\u5e93\u7684\u8bbe\u7f6e\uff09\uff0c\u5176\u4ed6\u56db\u4e2a\u9694\u79bb\u7ea7\u522b\u548c\u6570\u636e\u5e93\u7684\u9694\u79bb\u7ea7\u522b\u4e00\u81f4\uff1a<\/p>\n\n\n\n
ISOLATION_DEFAULT\uff1a\u7528\u5e95\u5c42\u6570\u636e\u5e93\u7684\u8bbe\u7f6e\u9694\u79bb\u7ea7\u522b\uff0c\u6570\u636e\u5e93\u8bbe\u7f6e\u7684\u662f\u4ec0\u4e48\u6211\u5c31\u7528\u4ec0\u4e48\uff1b<\/p>\n\n\n\n
ISOLATIONREAD<\/em>UNCOMMITTED\uff1a\u672a\u63d0\u4ea4\u8bfb\uff0c\u6700\u4f4e\u9694\u79bb\u7ea7\u522b\u3001\u4e8b\u52a1\u672a\u63d0\u4ea4\u524d\uff0c\u5c31\u53ef\u88ab\u5176\u4ed6\u4e8b\u52a1\u8bfb\u53d6\uff08\u4f1a\u51fa\u73b0\u5e7b\u8bfb\u3001\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\uff09\uff1b<\/p>\n\n\n\nISOLATIONREAD<\/em>COMMITTED\uff1a\u63d0\u4ea4\u8bfb\uff0c\u4e00\u4e2a\u4e8b\u52a1\u63d0\u4ea4\u540e\u624d\u80fd\u88ab\u5176\u4ed6\u4e8b\u52a1\u8bfb\u53d6\u5230\uff08\u4f1a\u9020\u6210\u5e7b\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\uff09\uff0cSQL server \u7684\u9ed8\u8ba4\u7ea7\u522b\uff1b<\/p>\n\n\n\nISOLATIONREPEATABLE<\/em>READ\uff1a\u53ef\u91cd\u590d\u8bfb\uff0c\u4fdd\u8bc1\u591a\u6b21\u8bfb\u53d6\u540c\u4e00\u4e2a\u6570\u636e\u65f6\uff0c\u5176\u503c\u90fd\u548c\u4e8b\u52a1\u5f00\u59cb\u65f6\u5019\u7684\u5185\u5bb9\u662f\u4e00\u81f4\uff0c\u7981\u6b62\u8bfb\u53d6\u5230\u522b\u7684\u4e8b\u52a1\u672a\u63d0\u4ea4\u7684\u6570\u636e\uff08\u4f1a\u9020\u6210\u5e7b\u8bfb\uff09\uff0cMySQL \u7684\u9ed8\u8ba4\u7ea7\u522b\uff1b<\/p>\n\n\n\nISOLATION_SERIALIZABLE\uff1a\u5e8f\u5217\u5316\uff0c\u4ee3\u4ef7\u6700\u9ad8\u6700\u53ef\u9760\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u8be5\u9694\u79bb\u7ea7\u522b\u80fd\u9632\u6b62\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\u3002<\/p>\n\n\n\n
\u300c\u810f\u8bfb\u300d<\/strong> \uff1a\u8868\u793a\u4e00\u4e2a\u4e8b\u52a1\u80fd\u591f\u8bfb\u53d6\u53e6\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u8fd8\u672a\u63d0\u4ea4\u7684\u6570\u636e\u3002\u6bd4\u5982\uff0c\u67d0\u4e2a\u4e8b\u52a1\u5c1d\u8bd5\u63d2\u5165\u8bb0\u5f55 A\uff0c\u6b64\u65f6\u8be5\u4e8b\u52a1\u8fd8\u672a\u63d0\u4ea4\uff0c\u7136\u540e\u53e6\u4e00\u4e2a\u4e8b\u52a1\u5c1d\u8bd5\u8bfb\u53d6\u5230\u4e86\u8bb0\u5f55 A\u3002<\/p>\n\n\n\n\u300c\u4e0d\u53ef\u91cd\u590d\u8bfb\u300d<\/strong> \uff1a\u662f\u6307\u5728\u4e00\u4e2a\u4e8b\u52a1\u5185\uff0c\u591a\u6b21\u8bfb\u540c\u4e00\u6570\u636e\u3002<\/p>\n\n\n\n\u300c\u5e7b\u8bfb\u300d<\/strong> \uff1a\u6307\u540c\u4e00\u4e2a\u4e8b\u52a1\u5185\u591a\u6b21\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u96c6\u4e0d\u4e00\u6837\u3002\u6bd4\u5982\u540c\u4e00\u4e2a\u4e8b\u52a1 A \u7b2c\u4e00\u6b21\u67e5\u8be2\u65f6\u5019\u6709 n \u6761\u8bb0\u5f55\uff0c\u4f46\u662f\u7b2c\u4e8c\u6b21\u540c\u7b49\u6761\u4ef6\u4e0b\u67e5\u8be2\u5374\u6709 n+1 \u6761\u8bb0\u5f55\uff0c\u8fd9\u5c31\u597d\u50cf\u4ea7\u751f\u4e86\u5e7b\u89c9\u3002\u53d1\u751f\u5e7b\u8bfb\u7684\u539f\u56e0\u4e5f\u662f\u53e6\u5916\u4e00\u4e2a\u4e8b\u52a1\u65b0\u589e\u6216\u8005\u5220\u9664\u6216\u8005\u4fee\u6539\u4e86\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u7ed3\u679c\u96c6\u91cc\u9762\u7684\u6570\u636e\uff0c\u540c\u4e00\u4e2a\u8bb0\u5f55\u7684\u6570\u636e\u5185\u5bb9\u88ab\u4fee\u6539\u4e86\uff0c\u6240\u6709\u6570\u636e\u884c\u7684\u8bb0\u5f55\u5c31\u53d8\u591a\u6216\u8005\u53d8\u5c11\u4e86\u3002<\/p>\n\n\n\n100. \u8bf4\u4e00\u4e0b spring mvc \u8fd0\u884c\u6d41\u7a0b\uff1f<\/h4>\n\n\n\n- spring mvc \u5148\u5c06\u8bf7\u6c42\u53d1\u9001\u7ed9 DispatcherServlet\u3002<\/li>
- DispatcherServlet \u67e5\u8be2\u4e00\u4e2a\u6216\u591a\u4e2a HandlerMapping\uff0c\u627e\u5230\u5904\u7406\u8bf7\u6c42\u7684 Controller\u3002<\/li>
- DispatcherServlet \u518d\u628a\u8bf7\u6c42\u63d0\u4ea4\u5230\u5bf9\u5e94\u7684 Controller\u3002<\/li>
- Controller \u8fdb\u884c\u4e1a\u52a1\u903b\u8f91\u5904\u7406\u540e\uff0c\u4f1a\u8fd4\u56de\u4e00\u4e2aModelAndView\u3002<\/li>
- Dispathcher \u67e5\u8be2\u4e00\u4e2a\u6216\u591a\u4e2a ViewResolver \u89c6\u56fe\u89e3\u6790\u5668\uff0c\u627e\u5230 ModelAndView \u5bf9\u8c61\u6307\u5b9a\u7684\u89c6\u56fe\u5bf9\u8c61\u3002<\/li>
- \u89c6\u56fe\u5bf9\u8c61\u8d1f\u8d23\u6e32\u67d3\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002<\/li><\/ul>\n\n\n\n
101. spring mvc \u6709\u54ea\u4e9b\u7ec4\u4ef6\uff1f<\/h4>\n\n\n\n- \u524d\u7f6e\u63a7\u5236\u5668 DispatcherServlet\u3002<\/li>
- \u6620\u5c04\u63a7\u5236\u5668 HandlerMapping\u3002<\/li>
- \u5904\u7406\u5668 Controller\u3002<\/li>
- \u6a21\u578b\u548c\u89c6\u56fe ModelAndView\u3002<\/li>
- \u89c6\u56fe\u89e3\u6790\u5668 ViewResolver\u3002<\/li><\/ul>\n\n\n\n
102. @RequestMapping \u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
\u5c06 http \u8bf7\u6c42\u6620\u5c04\u5230\u76f8\u5e94\u7684\u7c7b\/\u65b9\u6cd5\u4e0a\u3002<\/p>\n\n\n\n
103. @Autowired \u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
@Autowired \u5b83\u53ef\u4ee5\u5bf9\u7c7b\u6210\u5458\u53d8\u91cf\u3001\u65b9\u6cd5\u53ca\u6784\u9020\u51fd\u6570\u8fdb\u884c\u6807\u6ce8\uff0c\u5b8c\u6210\u81ea\u52a8\u88c5\u914d\u7684\u5de5\u4f5c\uff0c\u901a\u8fc7@Autowired \u7684\u4f7f\u7528\u6765\u6d88\u9664 set\/get \u65b9\u6cd5\u3002<\/p>\n\n\n\n
Spring Boot\/Spring Cloud<\/h3>\n\n\n\n104. \u4ec0\u4e48\u662f spring boot\uff1f<\/h4>\n\n\n\n
spring boot \u662f\u4e3a spring \u670d\u52a1\u7684\uff0c\u662f\u7528\u6765\u7b80\u5316\u65b0 spring \u5e94\u7528\u7684\u521d\u59cb\u642d\u5efa\u4ee5\u53ca\u5f00\u53d1\u8fc7\u7a0b\u7684\u3002<\/p>\n\n\n\n
105. \u4e3a\u4ec0\u4e48\u8981\u7528 spring boot\uff1f<\/h4>\n\n\n\n- \u914d\u7f6e\u7b80\u5355<\/li>
- \u72ec\u7acb\u8fd0\u884c<\/li>
- \u81ea\u52a8\u88c5\u914d<\/li>
- \u65e0\u4ee3\u7801\u751f\u6210\u548c xml \u914d\u7f6e<\/li>
- \u63d0\u4f9b\u5e94\u7528\u76d1\u63a7<\/li>
- \u6613\u4e0a\u624b<\/li>
- \u63d0\u5347\u5f00\u53d1\u6548\u7387<\/li><\/ul>\n\n\n\n
106. spring boot \u6838\u5fc3\u914d\u7f6e\u6587\u4ef6\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
spring boot \u6838\u5fc3\u7684\u4e24\u4e2a\u914d\u7f6e\u6587\u4ef6\uff1a<\/p>\n\n\n\n
- bootstrap (. yml \u6216\u8005 . properties)\uff1aboostrap \u7531\u7236 ApplicationContext \u52a0\u8f7d\u7684\uff0c\u6bd4 applicaton \u4f18\u5148\u52a0\u8f7d\uff0c\u4e14 boostrap \u91cc\u9762\u7684\u5c5e\u6027\u4e0d\u80fd\u88ab\u8986\u76d6\uff1b<\/li>
- application (. yml \u6216\u8005 . properties)\uff1a\u7528\u4e8e spring boot \u9879\u76ee\u7684\u81ea\u52a8\u5316\u914d\u7f6e\u3002<\/li><\/ul>\n\n\n\n
107. spring boot \u914d\u7f6e\u6587\u4ef6\u6709\u54ea\u51e0\u79cd\u7c7b\u578b\uff1f\u5b83\u4eec\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
\u914d\u7f6e\u6587\u4ef6\u6709 . properties \u683c\u5f0f\u548c . yml \u683c\u5f0f\uff0c\u5b83\u4eec\u4e3b\u8981\u7684\u533a\u522b\u662f\u4e66\u6cd5\u98ce\u683c\u4e0d\u540c\u3002<\/p>\n\n\n\n
. properties \u914d\u7f6e\u5982\u4e0b\uff1a<\/p>\n\n\n\n
spring.RabbitMQ.port=5672<\/code><\/pre>\n\n\n\n. yml \u914d\u7f6e\u5982\u4e0b\uff1a<\/p>\n\n\n\n
spring:\n RabbitMQ:\n port: 5672<\/code><\/pre>\n\n\n\nyml \u683c\u5f0f\u4e0d\u652f\u6301 @PropertySource \u6ce8\u89e3\u5bfc\u5165\u3002<\/p>\n\n\n\n
108. spring boot \u6709\u54ea\u4e9b\u65b9\u5f0f\u53ef\u4ee5\u5b9e\u73b0\u70ed\u90e8\u7f72\uff1f<\/h4>\n\n\n\n- \u4f7f\u7528 devtools \u542f\u52a8\u70ed\u90e8\u7f72\uff0c\u6dfb\u52a0 devtools \u5e93\uff0c\u5728\u914d\u7f6e\u6587\u4ef6\u4e2d\u628a spring. devtools. restart. enabled \u8bbe\u7f6e\u4e3a true\uff1b<\/li>
- \u4f7f\u7528 Intellij Idea \u7f16\u8f91\u5668\uff0c\u52fe\u4e0a\u81ea\u52a8\u7f16\u8bd1\u6216\u624b\u52a8\u91cd\u65b0\u7f16\u8bd1\u3002<\/li><\/ul>\n\n\n\n
109. jpa \u548c hibernate \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
jpa \u5168\u79f0 Java Persistence API\uff0c\u662f Java \u6301\u4e45\u5316\u63a5\u53e3\u89c4\u8303\uff0chibernate \u5c5e\u4e8e jpa \u7684\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n\n\n\n
110. \u4ec0\u4e48\u662f spring cloud\uff1f<\/h4>\n\n\n\n
spring cloud \u662f\u4e00\u7cfb\u5217\u6846\u67b6\u7684\u6709\u5e8f\u96c6\u5408\u3002\u5b83\u5229\u7528 spring boot \u7684\u5f00\u53d1\u4fbf\u5229\u6027\u5de7\u5999\u5730\u7b80\u5316\u4e86\u5206\u5e03\u5f0f\u7cfb\u7edf\u57fa\u7840\u8bbe\u65bd\u7684\u5f00\u53d1\uff0c\u5982\u670d\u52a1\u53d1\u73b0\u6ce8\u518c\u3001\u914d\u7f6e\u4e2d\u5fc3\u3001\u6d88\u606f\u603b\u7ebf\u3001\u8d1f\u8f7d\u5747\u8861\u3001\u65ad\u8def\u5668\u3001\u6570\u636e\u76d1\u63a7\u7b49\uff0c\u90fd\u53ef\u4ee5\u7528 spring boot \u7684\u5f00\u53d1\u98ce\u683c\u505a\u5230\u4e00\u952e\u542f\u52a8\u548c\u90e8\u7f72\u3002<\/p>\n\n\n\n
111. spring cloud \u65ad\u8def\u5668\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
\u5728\u5206\u5e03\u5f0f\u67b6\u6784\u4e2d\uff0c\u65ad\u8def\u5668\u6a21\u5f0f\u7684\u4f5c\u7528\u4e5f\u662f\u7c7b\u4f3c\u7684\uff0c\u5f53\u67d0\u4e2a\u670d\u52a1\u5355\u5143\u53d1\u751f\u6545\u969c\uff08\u7c7b\u4f3c\u7528\u7535\u5668\u53d1\u751f\u77ed\u8def\uff09\u4e4b\u540e\uff0c\u901a\u8fc7\u65ad\u8def\u5668\u7684\u6545\u969c\u76d1\u63a7\uff08\u7c7b\u4f3c\u7194\u65ad\u4fdd\u9669\u4e1d\uff09\uff0c\u5411\u8c03\u7528\u65b9\u8fd4\u56de\u4e00\u4e2a\u9519\u8bef\u54cd\u5e94\uff0c\u800c\u4e0d\u662f\u957f\u65f6\u95f4\u7684\u7b49\u5f85\u3002\u8fd9\u6837\u5c31\u4e0d\u4f1a\u4f7f\u5f97\u7ebf\u7a0b\u56e0\u8c03\u7528\u6545\u969c\u670d\u52a1\u88ab\u957f\u65f6\u95f4\u5360\u7528\u4e0d\u91ca\u653e\uff0c\u907f\u514d\u4e86\u6545\u969c\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u7684\u8513\u5ef6\u3002<\/p>\n\n\n\n
112. spring cloud \u7684\u6838\u5fc3\u7ec4\u4ef6\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n- Eureka\uff1a\u670d\u52a1\u6ce8\u518c\u4e8e\u53d1\u73b0\u3002<\/li>
- Feign\uff1a\u57fa\u4e8e\u52a8\u6001\u4ee3\u7406\u673a\u5236\uff0c\u6839\u636e\u6ce8\u89e3\u548c\u9009\u62e9\u7684\u673a\u5668\uff0c\u62fc\u63a5\u8bf7\u6c42 url \u5730\u5740\uff0c\u53d1\u8d77\u8bf7\u6c42\u3002<\/li>
- Ribbon\uff1a\u5b9e\u73b0\u8d1f\u8f7d\u5747\u8861\uff0c\u4ece\u4e00\u4e2a\u670d\u52a1\u7684\u591a\u53f0\u673a\u5668\u4e2d\u9009\u62e9\u4e00\u53f0\u3002<\/li>
- Hystrix\uff1a\u63d0\u4f9b\u7ebf\u7a0b\u6c60\uff0c\u4e0d\u540c\u7684\u670d\u52a1\u8d70\u4e0d\u540c\u7684\u7ebf\u7a0b\u6c60\uff0c\u5b9e\u73b0\u4e86\u4e0d\u540c\u670d\u52a1\u8c03\u7528\u7684\u9694\u79bb\uff0c\u907f\u514d\u4e86\u670d\u52a1\u96ea\u5d29\u7684\u95ee\u9898\u3002<\/li>
- Zuul\uff1a\u7f51\u5173\u7ba1\u7406\uff0c\u7531 Zuul \u7f51\u5173\u8f6c\u53d1\u8bf7\u6c42\u7ed9\u5bf9\u5e94\u7684\u670d\u52a1\u3002<\/li><\/ul>\n\n\n\n
Hibernate<\/h3>\n\n\n\n113. \u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528 hibernate\uff1f<\/h4>\n\n\n\n- hibernate \u662f\u5bf9 jdbc \u7684\u5c01\u88c5\uff0c\u5927\u5927\u7b80\u5316\u4e86\u6570\u636e\u8bbf\u95ee\u5c42\u7684\u7e41\u7410\u7684\u91cd\u590d\u6027\u4ee3\u7801\u3002<\/li>
- hibernate \u662f\u4e00\u4e2a\u4f18\u79c0\u7684 ORM \u5b9e\u73b0\uff0c\u5f88\u591a\u7a0b\u5ea6\u4e0a\u7b80\u5316\u4e86 DAO \u5c42\u7684\u7f16\u7801\u529f\u80fd\u3002<\/li>
- \u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u8fdb\u884c\u6570\u636e\u5e93\u7684\u79fb\u690d\u5de5\u4f5c\u3002<\/li>
- \u63d0\u4f9b\u4e86\u7f13\u5b58\u673a\u5236\uff0c\u662f\u7a0b\u5e8f\u6267\u884c\u66f4\u6539\u7684\u9ad8\u6548\u3002<\/li><\/ul>\n\n\n\n
114. \u4ec0\u4e48\u662f ORM \u6846\u67b6\uff1f<\/h4>\n\n\n\n
ORM\uff08Object Relation Mapping\uff09\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\uff0c\u662f\u628a\u6570\u636e\u5e93\u4e2d\u7684\u5173\u7cfb\u6570\u636e\u6620\u5c04\u6210\u4e3a\u7a0b\u5e8f\u4e2d\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n
\u4f7f\u7528 ORM \u7684\u4f18\u70b9\uff1a\u63d0\u9ad8\u4e86\u5f00\u53d1\u6548\u7387\u964d\u4f4e\u4e86\u5f00\u53d1\u6210\u672c\u3001\u5f00\u53d1\u66f4\u7b80\u5355\u66f4\u5bf9\u8c61\u5316\u3001\u53ef\u79fb\u690d\u66f4\u5f3a\u3002<\/p>\n\n\n\n
115. hibernate \u4e2d\u5982\u4f55\u5728\u63a7\u5236\u53f0\u67e5\u770b\u6253\u5370\u7684 SQL \u8bed\u53e5\uff1f<\/h4>\n\n\n\n
\u5728 Config \u91cc\u9762\u628a hibernate. show_SQL \u8bbe\u7f6e\u4e3a true \u5c31\u53ef\u4ee5\u3002\u4f46\u4e0d\u5efa\u8bae\u5f00\u542f\uff0c\u5f00\u542f\u4e4b\u540e\u4f1a\u964d\u4f4e\u7a0b\u5e8f\u7684\u8fd0\u884c\u6548\u7387\u3002<\/p>\n\n\n\n
116. hibernate \u6709\u51e0\u79cd\u67e5\u8be2\u65b9\u5f0f\uff1f<\/h4>\n\n\n\n
\u4e09\u79cd\uff1ahql\u3001\u539f\u751f SQL\u3001\u6761\u4ef6\u67e5\u8be2 Criteria\u3002<\/p>\n\n\n\n
117. hibernate \u5b9e\u4f53\u7c7b\u53ef\u4ee5\u88ab\u5b9a\u4e49\u4e3a final \u5417\uff1f<\/h4>\n\n\n\n
\u5b9e\u4f53\u7c7b\u53ef\u4ee5\u5b9a\u4e49\u4e3a final \u7c7b\uff0c\u4f46\u8fd9\u6837\u7684\u8bdd\u5c31\u4e0d\u80fd\u4f7f\u7528 hibernate \u4ee3\u7406\u6a21\u5f0f\u4e0b\u7684\u5ef6\u8fdf\u5173\u8054\u63d0\u4f9b\u6027\u80fd\u4e86\uff0c\u6240\u4ee5\u4e0d\u5efa\u8bae\u5b9a\u4e49\u5b9e\u4f53\u7c7b\u4e3a final\u3002<\/p>\n\n\n\n
118. \u5728 hibernate \u4e2d\u4f7f\u7528 Integer \u548c int \u505a\u6620\u5c04\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
Integer \u7c7b\u578b\u4e3a\u5bf9\u8c61\uff0c\u5b83\u7684\u503c\u5141\u8bb8\u4e3a null\uff0c\u800c int \u5c5e\u4e8e\u57fa\u7840\u6570\u636e\u7c7b\u578b\uff0c\u503c\u4e0d\u80fd\u4e3a null\u3002<\/p>\n\n\n\n
119. hibernate \u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/h4>\n\n\n\n- \u8bfb\u53d6\u5e76\u89e3\u6790\u914d\u7f6e\u6587\u4ef6\u3002<\/li>
- \u8bfb\u53d6\u5e76\u89e3\u6790\u6620\u5c04\u6587\u4ef6\uff0c\u521b\u5efa SessionFactory\u3002<\/li>
- \u6253\u5f00 Session\u3002<\/li>
- \u521b\u5efa\u4e8b\u52a1\u3002<\/li>
- \u8fdb\u884c\u6301\u4e45\u5316\u64cd\u4f5c\u3002<\/li>
- \u63d0\u4ea4\u4e8b\u52a1\u3002<\/li>
- \u5173\u95ed Session\u3002<\/li>
- \u5173\u95ed SessionFactory\u3002<\/li><\/ul>\n\n\n\n
120. get()\u548c load()\u7684\u533a\u522b\uff1f<\/h4>\n\n\n\n
- JDK\uff1aJava Development Kit \u7684\u7b80\u79f0\uff0cJava \u5f00\u53d1\u5de5\u5177\u5305\uff0c\u63d0\u4f9b\u4e86 Java \u7684\u5f00\u53d1\u73af\u5883\u548c\u8fd0\u884c\u73af\u5883\u3002<\/li>
- JRE\uff1aJava Runtime Environment \u7684\u7b80\u79f0\uff0cJava \u8fd0\u884c\u73af\u5883\uff0c\u4e3a Java \u7684\u8fd0\u884c\u63d0\u4f9b\u4e86\u6240\u9700\u73af\u5883\u3002<\/li><\/ul>\n\n\n\n
\u5177\u4f53\u6765\u8bf4 JDK \u5176\u5b9e\u5305\u542b\u4e86 JRE\uff0c\u540c\u65f6\u8fd8\u5305\u542b\u4e86\u7f16\u8bd1 Java \u6e90\u7801\u7684\u7f16\u8bd1\u5668 Javac\uff0c\u8fd8\u5305\u542b\u4e86\u5f88\u591a Java \u7a0b\u5e8f\u8c03\u8bd5\u548c\u5206\u6790\u7684\u5de5\u5177\u3002\u7b80\u5355\u6765\u8bf4\uff1a\u5982\u679c\u4f60\u9700\u8981\u8fd0\u884c Java \u7a0b\u5e8f\uff0c\u53ea\u9700\u5b89\u88c5 JRE \u5c31\u53ef\u4ee5\u4e86\uff0c\u5982\u679c\u4f60\u9700\u8981\u7f16\u5199 Java \u7a0b\u5e8f\uff0c\u9700\u8981\u5b89\u88c5 JDK\u3002<\/p>\n\n\n\n
2. == \u548c equals \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
\u300c== \u89e3\u8bfb\u300d<\/strong><\/p>\n\n\n\n
\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b == \u7684\u4f5c\u7528\u6548\u679c\u662f\u4e0d\u540c\u7684\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
- \u57fa\u672c\u7c7b\u578b\uff1a\u6bd4\u8f83\u7684\u662f\u503c\u662f\u5426\u76f8\u540c\uff1b<\/li>
- \u5f15\u7528\u7c7b\u578b\uff1a\u6bd4\u8f83\u7684\u662f\u5f15\u7528\u662f\u5426\u76f8\u540c\uff1b<\/li><\/ul>\n\n\n\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n\n\n\n
String x = \"string\";\nString y = \"string\";\nString z = new String(\"string\");\nSystem.out.println(x==y); \/\/ true\nSystem.out.println(x==z); \/\/ false\nSystem.out.println(x.equals(y)); \/\/ true\nSystem.out.println(x.equals(z)); \/\/ true<\/code><\/pre>\n\n\n\n\u4ee3\u7801\u89e3\u8bfb\uff1a\u56e0\u4e3a x \u548c y \u6307\u5411\u7684\u662f\u540c\u4e00\u4e2a\u5f15\u7528\uff0c\u6240\u4ee5 == \u4e5f\u662f true\uff0c\u800c new String()\u65b9\u6cd5\u5219\u91cd\u5199\u5f00\u8f9f\u4e86\u5185\u5b58\u7a7a\u95f4\uff0c\u6240\u4ee5 == \u7ed3\u679c\u4e3a false\uff0c\u800c equals \u6bd4\u8f83\u7684\u4e00\u76f4\u662f\u503c\uff0c\u6240\u4ee5\u7ed3\u679c\u90fd\u4e3a true\u3002<\/p>\n\n\n\n
\u300cequals \u89e3\u8bfb\u300d<\/strong><\/p>\n\n\n\n
equals \u672c\u8d28\u4e0a\u5c31\u662f ==\uff0c\u53ea\u4e0d\u8fc7 String \u548c Integer \u7b49\u91cd\u5199\u4e86 equals \u65b9\u6cd5\uff0c\u628a\u5b83\u53d8\u6210\u4e86\u503c\u6bd4\u8f83\u3002\u770b\u4e0b\u9762\u7684\u4ee3\u7801\u5c31\u660e\u767d\u4e86\u3002<\/p>\n\n\n\n
\u9996\u5148\u6765\u770b\u9ed8\u8ba4\u60c5\u51b5\u4e0b equals \u6bd4\u8f83\u4e00\u4e2a\u6709\u76f8\u540c\u503c\u7684\u5bf9\u8c61\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
classCat{\n publicCat(String name){\n this.name = name;\n }\n\n private String name;\n\n public String getName(){\n return name;\n }\n\n publicvoidsetName(String name){\n this.name = name;\n }\n}\n\nCat c1 = new Cat(\"\u738b\u78ca\");\nCat c2 = new Cat(\"\u738b\u78ca\");\nSystem.out.println(c1.equals(c2)); \/\/ false<\/code><\/pre>\n\n\n\n\u8f93\u51fa\u7ed3\u679c\u51fa\u4e4e\u6211\u4eec\u7684\u610f\u6599\uff0c\u7adf\u7136\u662f false\uff1f\u8fd9\u662f\u600e\u4e48\u56de\u4e8b\uff0c\u770b\u4e86 equals \u6e90\u7801\u5c31\u77e5\u9053\u4e86\uff0c\u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
publicbooleanequals(Object obj){\n return (this == obj);\n}<\/code><\/pre>\n\n\n\n\u539f\u6765 equals \u672c\u8d28\u4e0a\u5c31\u662f ==\u3002<\/p>\n\n\n\n
\u90a3\u95ee\u9898\u6765\u4e86\uff0c\u4e24\u4e2a\u76f8\u540c\u503c\u7684 String \u5bf9\u8c61\uff0c\u4e3a\u4ec0\u4e48\u8fd4\u56de\u7684\u662f true\uff1f\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
String s1 = new String(\"\u8001\u738b\");\nString s2 = new String(\"\u8001\u738b\");\nSystem.out.println(s1.equals(s2)); \/\/ true<\/code><\/pre>\n\n\n\n\u540c\u6837\u7684\uff0c\u5f53\u6211\u4eec\u8fdb\u5165 String \u7684 equals \u65b9\u6cd5\uff0c\u627e\u5230\u4e86\u7b54\u6848\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
public boolean equals(Object anObject){\n if (this == anObject) {\n return true;\n }\n if (anObject instanceof String) {\n String anotherString = (String)anObject;\n int n = value.length;\n if (n == anotherString.value.length) {\n char v1[] = value;\n char v2[] = anotherString.value;\n int i = 0;\n while (n-- != 0) {\n if (v1[i] != v2[i])\n return false;\n i++;\n }\n return true;\n }\n }\n return false;\n}<\/code><\/pre>\n\n\n\n\u539f\u6765\u662f String \u91cd\u5199\u4e86 Object \u7684 equals \u65b9\u6cd5\uff0c\u628a\u5f15\u7528\u6bd4\u8f83\u6539\u6210\u4e86\u503c\u6bd4\u8f83\u3002<\/p>\n\n\n\n
\u300c\u603b\u7ed3\u300d<\/strong> \uff1a== \u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6765\u8bf4\u662f\u503c\u6bd4\u8f83\uff0c\u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\u6765\u8bf4\u662f\u6bd4\u8f83\u7684\u662f\u5f15\u7528\uff1b\u800c equals \u9ed8\u8ba4\u60c5\u51b5\u4e0b\u662f\u5f15\u7528\u6bd4\u8f83\uff0c\u53ea\u662f\u5f88\u591a\u7c7b\u91cd\u65b0\u4e86 equals \u65b9\u6cd5\uff0c\u6bd4\u5982 String\u3001Integer \u7b49\u628a\u5b83\u53d8\u6210\u4e86\u503c\u6bd4\u8f83\uff0c\u6240\u4ee5\u4e00\u822c\u60c5\u51b5\u4e0b equals \u6bd4\u8f83\u7684\u662f\u503c\u662f\u5426\u76f8\u7b49\u3002<\/p>\n\n\n\n
3. \u4e24\u4e2a\u5bf9\u8c61\u7684 hashCode() \u76f8\u540c\uff0c\u5219 equals() \u4e5f\u4e00\u5b9a\u4e3a true\uff0c\u5bf9\u5417\uff1f<\/h4>\n\n\n\n
\u4e0d\u5bf9\uff0c\u4e24\u4e2a\u5bf9\u8c61\u7684 hashCode() \u76f8\u540c\uff0cequals() \u4e0d\u4e00\u5b9a true\u3002<\/p>\n\n\n\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n\n\n\n
String str1 = \"\u901a\u8bdd\";\nString str2 = \"\u91cd\u5730\";\nSystem. out. println(String. format(\"str1\uff1a%d | str2\uff1a%d\", str1. hashCode(),str2. hashCode()));\nSystem. out. println(str1. equals(str2));<\/code><\/pre>\n\n\n\n\u6267\u884c\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n
str1\uff1a1179395 | str2\uff1a1179395\n\nfalse<\/code><\/pre>\n\n\n\n\u4ee3\u7801\u89e3\u8bfb\uff1a\u5f88\u663e\u7136\u201c\u901a\u8bdd\u201d\u548c\u201c\u91cd\u5730\u201d\u7684 hashCode() \u76f8\u540c\uff0c\u7136\u800c equals() \u5219\u4e3a false\uff0c\u56e0\u4e3a\u5728\u6563\u5217\u8868\u4e2d\uff0chashCode() \u76f8\u7b49\u5373\u4e24\u4e2a\u952e\u503c\u5bf9\u7684\u54c8\u5e0c\u503c\u76f8\u7b49\uff0c\u7136\u800c\u54c8\u5e0c\u503c\u76f8\u7b49\uff0c\u5e76\u4e0d\u4e00\u5b9a\u80fd\u5f97\u51fa\u952e\u503c\u5bf9\u76f8\u7b49\u3002<\/p>\n\n\n\n
4. final \u5728 Java \u4e2d\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f<\/h4>\n\n\n\n
- final \u4fee\u9970\u7684\u7c7b\u53eb\u6700\u7ec8\u7c7b\uff0c\u8be5\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\u3002<\/li>
- final \u4fee\u9970\u7684\u65b9\u6cd5\u4e0d\u80fd\u88ab\u91cd\u5199\u3002<\/li>
- final \u4fee\u9970\u7684\u53d8\u91cf\u53eb\u5e38\u91cf\uff0c\u5e38\u91cf\u5fc5\u987b\u521d\u59cb\u5316\uff0c\u521d\u59cb\u5316\u4e4b\u540e\u503c\u5c31\u4e0d\u80fd\u88ab\u4fee\u6539\u3002<\/li><\/ul>\n\n\n\n
5. Java \u4e2d\u7684 Math. round(-1. 5) \u7b49\u4e8e\u591a\u5c11\uff1f<\/h4>\n\n\n\n
\u7b49\u4e8e -1\uff0c\u56e0\u4e3a\u5728\u6570\u8f74\u4e0a\u53d6\u503c\u65f6\uff0c\u4e2d\u95f4\u503c\uff080.5\uff09\u5411\u53f3\u53d6\u6574\uff0c\u6240\u4ee5\u6b63 0.5 \u662f\u5f80\u4e0a\u53d6\u6574\uff0c\u8d1f 0.5 \u662f\u76f4\u63a5\u820d\u5f03\u3002<\/p>\n\n\n\n
6. String \u5c5e\u4e8e\u57fa\u7840\u7684\u6570\u636e\u7c7b\u578b\u5417\uff1f<\/h4>\n\n\n\n
String \u4e0d\u5c5e\u4e8e\u57fa\u7840\u7c7b\u578b\uff0c\u57fa\u7840\u7c7b\u578b\u6709 8 \u79cd\uff1abyte\u3001boolean\u3001char\u3001short\u3001int\u3001float\u3001long\u3001double\uff0c\u800c String \u5c5e\u4e8e\u5bf9\u8c61\u3002<\/p>\n\n\n\n
7. Java \u4e2d\u64cd\u4f5c\u5b57\u7b26\u4e32\u90fd\u6709\u54ea\u4e9b\u7c7b\uff1f\u5b83\u4eec\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
\u64cd\u4f5c\u5b57\u7b26\u4e32\u7684\u7c7b\u6709\uff1aString\u3001StringBuffer\u3001StringBuilder\u3002<\/p>\n\n\n\n
String \u548c StringBuffer\u3001StringBuilder \u7684\u533a\u522b\u5728\u4e8e String \u58f0\u660e\u7684\u662f\u4e0d\u53ef\u53d8\u7684\u5bf9\u8c61\uff0c\u6bcf\u6b21\u64cd\u4f5c\u90fd\u4f1a\u751f\u6210\u65b0\u7684 String \u5bf9\u8c61\uff0c\u7136\u540e\u5c06\u6307\u9488\u6307\u5411\u65b0\u7684 String \u5bf9\u8c61\uff0c\u800c StringBuffer\u3001StringBuilder \u53ef\u4ee5\u5728\u539f\u6709\u5bf9\u8c61\u7684\u57fa\u7840\u4e0a\u8fdb\u884c\u64cd\u4f5c\uff0c\u6240\u4ee5\u5728\u7ecf\u5e38\u6539\u53d8\u5b57\u7b26\u4e32\u5185\u5bb9\u7684\u60c5\u51b5\u4e0b\u6700\u597d\u4e0d\u8981\u4f7f\u7528 String\u3002<\/p>\n\n\n\n
StringBuffer \u548c StringBuilder \u6700\u5927\u7684\u533a\u522b\u5728\u4e8e\uff0cStringBuffer \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800c StringBuilder \u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4f46 StringBuilder \u7684\u6027\u80fd\u5374\u9ad8\u4e8e StringBuffer\uff0c\u6240\u4ee5\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u63a8\u8350\u4f7f\u7528 StringBuilder\uff0c\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u63a8\u8350\u4f7f\u7528 StringBuffer\u3002<\/p>\n\n\n\n
8. String str=”i”\u4e0e String str=new String(“i”)\u4e00\u6837\u5417\uff1f<\/h4>\n\n\n\n
\u4e0d\u4e00\u6837\uff0c\u56e0\u4e3a\u5185\u5b58\u7684\u5206\u914d\u65b9\u5f0f\u4e0d\u4e00\u6837\u3002String str=”i”\u7684\u65b9\u5f0f\uff0cJava \u865a\u62df\u673a\u4f1a\u5c06\u5176\u5206\u914d\u5230\u5e38\u91cf\u6c60\u4e2d\uff1b\u800c String str=new String(“i”) \u5219\u4f1a\u88ab\u5206\u5230\u5806\u5185\u5b58\u4e2d\u3002<\/p>\n\n\n\n
9. \u5982\u4f55\u5c06\u5b57\u7b26\u4e32\u53cd\u8f6c\uff1f<\/h4>\n\n\n\n
\u4f7f\u7528 StringBuilder \u6216\u8005 stringBuffer \u7684 reverse() \u65b9\u6cd5\u3002<\/p>\n\n\n\n
\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
\/\/ StringBuffer reverse\nStringBuffer stringBuffer = new StringBuffer();\nstringBuffer.append(\"abcdefg\");\nSystem.out.println(stringBuffer.reverse()); \/\/ gfedcba\n\/\/ StringBuilder reverse\nStringBuilder stringBuilder = new StringBuilder();\nstringBuilder.append(\"abcdefg\");\nSystem.out.println(stringBuilder.reverse()); \/\/ gfedcba<\/code><\/pre>\n\n\n\n10. String \u7c7b\u7684\u5e38\u7528\u65b9\u6cd5\u90fd\u6709\u90a3\u4e9b\uff1f<\/h4>\n\n\n\n
- indexOf()\uff1a\u8fd4\u56de\u6307\u5b9a\u5b57\u7b26\u7684\u7d22\u5f15\u3002<\/li>
- charAt()\uff1a\u8fd4\u56de\u6307\u5b9a\u7d22\u5f15\u5904\u7684\u5b57\u7b26\u3002<\/li>
- replace()\uff1a\u5b57\u7b26\u4e32\u66ff\u6362\u3002<\/li>
- trim()\uff1a\u53bb\u9664\u5b57\u7b26\u4e32\u4e24\u7aef\u7a7a\u767d\u3002<\/li>
- split()\uff1a\u5206\u5272\u5b57\u7b26\u4e32\uff0c\u8fd4\u56de\u4e00\u4e2a\u5206\u5272\u540e\u7684\u5b57\u7b26\u4e32\u6570\u7ec4\u3002<\/li>
- getBytes()\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u7684 byte \u7c7b\u578b\u6570\u7ec4\u3002<\/li>
- length()\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u957f\u5ea6\u3002<\/li>
- toLowerCase()\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6210\u5c0f\u5199\u5b57\u6bcd\u3002<\/li>
- toUpperCase()\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6210\u5927\u5199\u5b57\u7b26\u3002<\/li>
- substring()\uff1a\u622a\u53d6\u5b57\u7b26\u4e32\u3002<\/li>
- equals()\uff1a\u5b57\u7b26\u4e32\u6bd4\u8f83\u3002<\/li><\/ul>\n\n\n\n
11. \u62bd\u8c61\u7c7b\u5fc5\u987b\u8981\u6709\u62bd\u8c61\u65b9\u6cd5\u5417\uff1f<\/h4>\n\n\n\n
\u4e0d\u9700\u8981\uff0c\u62bd\u8c61\u7c7b\u4e0d\u4e00\u5b9a\u975e\u8981\u6709\u62bd\u8c61\u65b9\u6cd5\u3002<\/p>\n\n\n\n
\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
abstract classCat{\n publicstaticvoidsayHi(){\n System. out. println(\"hi~\");\n }\n}<\/code><\/pre>\n\n\n\n\u4e0a\u9762\u4ee3\u7801\uff0c\u62bd\u8c61\u7c7b\u5e76\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\u4f46\u5b8c\u5168\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n\n\n\n
12. \u666e\u901a\u7c7b\u548c\u62bd\u8c61\u7c7b\u6709\u54ea\u4e9b\u533a\u522b\uff1f<\/h4>\n\n\n\n
- \u666e\u901a\u7c7b\u4e0d\u80fd\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\uff0c\u62bd\u8c61\u7c7b\u53ef\u4ee5\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\u3002<\/li>
- \u62bd\u8c61\u7c7b\u4e0d\u80fd\u76f4\u63a5\u5b9e\u4f8b\u5316\uff0c\u666e\u901a\u7c7b\u53ef\u4ee5\u76f4\u63a5\u5b9e\u4f8b\u5316\u3002<\/li><\/ul>\n\n\n\n
13. \u62bd\u8c61\u7c7b\u80fd\u4f7f\u7528 final \u4fee\u9970\u5417\uff1f<\/h4>\n\n\n\n
\u4e0d\u80fd\uff0c\u5b9a\u4e49\u62bd\u8c61\u7c7b\u5c31\u662f\u8ba9\u5176\u4ed6\u7c7b\u7ee7\u627f\u7684\uff0c\u5982\u679c\u5b9a\u4e49\u4e3a final \u8be5\u7c7b\u5c31\u4e0d\u80fd\u88ab\u7ee7\u627f\uff0c\u8fd9\u6837\u5f7c\u6b64\u5c31\u4f1a\u4ea7\u751f\u77db\u76fe\uff0c\u6240\u4ee5 final \u4e0d\u80fd\u4fee\u9970\u62bd\u8c61\u7c7b\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u7f16\u8f91\u5668\u4e5f\u4f1a\u63d0\u793a\u9519\u8bef\u4fe1\u606f\uff1a<\/p>\n\n\n\n
final\u9762\u8bd5\u9898<\/figcaption><\/figure><\/div>\n\n\n\n 14. \u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- \u5b9e\u73b0\uff1a\u62bd\u8c61\u7c7b\u7684\u5b50\u7c7b\u4f7f\u7528 extends \u6765\u7ee7\u627f\uff1b\u63a5\u53e3\u5fc5\u987b\u4f7f\u7528 implements \u6765\u5b9e\u73b0\u63a5\u53e3\u3002<\/li>
- \u6784\u9020\u51fd\u6570\uff1a\u62bd\u8c61\u7c7b\u53ef\u4ee5\u6709\u6784\u9020\u51fd\u6570\uff1b\u63a5\u53e3\u4e0d\u80fd\u6709\u3002<\/li>
- \u5b9e\u73b0\u6570\u91cf\uff1a\u7c7b\u53ef\u4ee5\u5b9e\u73b0\u5f88\u591a\u4e2a\u63a5\u53e3\uff1b\u4f46\u662f\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u62bd\u8c61\u7c7b\u3002<\/li>
- \u8bbf\u95ee\u4fee\u9970\u7b26\uff1a\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u9ed8\u8ba4\u4f7f\u7528 public \u4fee\u9970\uff1b\u62bd\u8c61\u7c7b\u4e2d\u7684\u65b9\u6cd5\u53ef\u4ee5\u662f\u4efb\u610f\u8bbf\u95ee\u4fee\u9970\u7b26\u3002<\/li><\/ul>\n\n\n\n
15. Java \u4e2d IO \u6d41\u5206\u4e3a\u51e0\u79cd\uff1f<\/h4>\n\n\n\n
\u6309\u529f\u80fd\u6765\u5206\uff1a\u8f93\u5165\u6d41\uff08input\uff09\u3001\u8f93\u51fa\u6d41\uff08output\uff09\u3002<\/p>\n\n\n\n
\u6309\u7c7b\u578b\u6765\u5206\uff1a\u5b57\u8282\u6d41\u548c\u5b57\u7b26\u6d41\u3002<\/p>\n\n\n\n
\u5b57\u8282\u6d41\u548c\u5b57\u7b26\u6d41\u7684\u533a\u522b\u662f\uff1a\u5b57\u8282\u6d41\u6309 8 \u4f4d\u4f20\u8f93\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u8f93\u5165\u8f93\u51fa\u6570\u636e\uff0c\u5b57\u7b26\u6d41\u6309 16 \u4f4d\u4f20\u8f93\u4ee5\u5b57\u7b26\u4e3a\u5355\u4f4d\u8f93\u5165\u8f93\u51fa\u6570\u636e\u3002<\/p>\n\n\n\n
16. BIO\u3001NIO\u3001AIO \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- BIO\uff1aBlock IO \u540c\u6b65\u963b\u585e\u5f0f IO\uff0c\u5c31\u662f\u6211\u4eec\u5e73\u5e38\u4f7f\u7528\u7684\u4f20\u7edf IO\uff0c\u5b83\u7684\u7279\u70b9\u662f\u6a21\u5f0f\u7b80\u5355\u4f7f\u7528\u65b9\u4fbf\uff0c\u5e76\u53d1\u5904\u7406\u80fd\u529b\u4f4e\u3002<\/li>
- NIO\uff1aNon IO \u540c\u6b65\u975e\u963b\u585e IO\uff0c\u662f\u4f20\u7edf IO \u7684\u5347\u7ea7\uff0c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u901a\u8fc7 Channel\uff08\u901a\u9053\uff09\u901a\u8baf\uff0c\u5b9e\u73b0\u4e86\u591a\u8def\u590d\u7528\u3002<\/li>
- AIO\uff1aAsynchronous IO \u662f NIO \u7684\u5347\u7ea7\uff0c\u4e5f\u53eb NIO2\uff0c\u5b9e\u73b0\u4e86\u5f02\u6b65\u975e\u5835\u585e IO \uff0c\u5f02\u6b65 IO \u7684\u64cd\u4f5c\u57fa\u4e8e\u4e8b\u4ef6\u548c\u56de\u8c03\u673a\u5236\u3002<\/li><\/ul>\n\n\n\n
17. Files\u7684\u5e38\u7528\u65b9\u6cd5\u90fd\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n
- Files. exists()\uff1a\u68c0\u6d4b\u6587\u4ef6\u8def\u5f84\u662f\u5426\u5b58\u5728\u3002<\/li>
- Files. createFile()\uff1a\u521b\u5efa\u6587\u4ef6\u3002<\/li>
- Files. createDirectory()\uff1a\u521b\u5efa\u6587\u4ef6\u5939\u3002<\/li>
- Files. delete()\uff1a\u5220\u9664\u4e00\u4e2a\u6587\u4ef6\u6216\u76ee\u5f55\u3002<\/li>
- Files. copy()\uff1a\u590d\u5236\u6587\u4ef6\u3002<\/li>
- Files. move()\uff1a\u79fb\u52a8\u6587\u4ef6\u3002<\/li>
- Files. size()\uff1a\u67e5\u770b\u6587\u4ef6\u4e2a\u6570\u3002<\/li>
- Files. read()\uff1a\u8bfb\u53d6\u6587\u4ef6\u3002<\/li>
- Files. write()\uff1a\u5199\u5165\u6587\u4ef6\u3002<\/li><\/ul>\n\n\n\n
\u5bb9\u5668<\/h3>\n\n\n\n
18. Java \u5bb9\u5668\u90fd\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n
Java \u5bb9\u5668\u5206\u4e3a Collection \u548c Map \u4e24\u5927\u7c7b\uff0c\u5176\u4e0b\u53c8\u6709\u5f88\u591a\u5b50\u7c7b\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
- Collection<\/li>
- List\n
- ArrayList<\/li>
- LinkedList<\/li>
- Vector<\/li>
- Stack<\/li><\/ul>\n<\/li>
- Set\n
- HashSet<\/li>
- LinkedHashSet<\/li>
- TreeSet<\/li><\/ul>\n<\/li>
- Map<\/li>
- HashMap\n
- LinkedHashMap<\/li><\/ul>\n<\/li>
- TreeMap<\/li>
- ConcurrentHashMap<\/li>
- Hashtable<\/li><\/ul>\n\n\n\n
19. Collection \u548c Collections \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- Collection \u662f\u4e00\u4e2a\u96c6\u5408\u63a5\u53e3\uff0c\u5b83\u63d0\u4f9b\u4e86\u5bf9\u96c6\u5408\u5bf9\u8c61\u8fdb\u884c\u57fa\u672c\u64cd\u4f5c\u7684\u901a\u7528\u63a5\u53e3\u65b9\u6cd5\uff0c\u6240\u6709\u96c6\u5408\u90fd\u662f\u5b83\u7684\u5b50\u7c7b\uff0c\u6bd4\u5982 List\u3001Set \u7b49\u3002<\/li>
- Collections \u662f\u4e00\u4e2a\u5305\u88c5\u7c7b\uff0c\u5305\u542b\u4e86\u5f88\u591a\u9759\u6001\u65b9\u6cd5\uff0c\u4e0d\u80fd\u88ab\u5b9e\u4f8b\u5316\uff0c\u5c31\u50cf\u4e00\u4e2a\u5de5\u5177\u7c7b\uff0c\u6bd4\u5982\u63d0\u4f9b\u7684\u6392\u5e8f\u65b9\u6cd5\uff1a Collections. sort(list)\u3002<\/li><\/ul>\n\n\n\n
20. List\u3001Set\u3001Map \u4e4b\u95f4\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
List\u3001Set\u3001Map \u7684\u533a\u522b\u4e3b\u8981\u4f53\u73b0\u5728\u4e24\u4e2a\u65b9\u9762\uff1a\u5143\u7d20\u662f\u5426\u6709\u5e8f\u3001\u662f\u5426\u5141\u8bb8\u5143\u7d20\u91cd\u590d\u3002<\/p>\n\n\n\n
\u4e09\u8005\u4e4b\u95f4\u7684\u533a\u522b\uff0c\u5982\u4e0b\u8868\uff1a<\/p>\n\n\n\n
List\u3001Set\u3001Map \u7684\u533a\u522b<\/figcaption><\/figure><\/div>\n\n\n\n 21. HashMap \u548c Hashtable \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- \u5b58\u50a8\uff1aHashMap \u8fd0\u884c key \u548c value \u4e3a null\uff0c\u800c Hashtable \u4e0d\u5141\u8bb8\u3002<\/li>
- \u7ebf\u7a0b\u5b89\u5168\uff1aHashtable \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800c HashMap \u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/li>
- \u63a8\u8350\u4f7f\u7528\uff1a\u5728 Hashtable \u7684\u7c7b\u6ce8\u91ca\u53ef\u4ee5\u770b\u5230\uff0cHashtable \u662f\u4fdd\u7559\u7c7b\u4e0d\u5efa\u8bae\u4f7f\u7528\uff0c\u63a8\u8350\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u4f7f\u7528 HashMap \u66ff\u4ee3\uff0c\u5982\u679c\u9700\u8981\u591a\u7ebf\u7a0b\u4f7f\u7528\u5219\u7528 ConcurrentHashMap \u66ff\u4ee3\u3002<\/li><\/ul>\n\n\n\n
22. \u5982\u4f55\u51b3\u5b9a\u4f7f\u7528 HashMap \u8fd8\u662f TreeMap\uff1f<\/h4>\n\n\n\n
\u5bf9\u4e8e\u5728 Map \u4e2d\u63d2\u5165\u3001\u5220\u9664\u3001\u5b9a\u4f4d\u4e00\u4e2a\u5143\u7d20\u8fd9\u7c7b\u64cd\u4f5c\uff0cHashMap \u662f\u6700\u597d\u7684\u9009\u62e9\uff0c\u56e0\u4e3a\u76f8\u5bf9\u800c\u8a00 HashMap \u7684\u63d2\u5165\u4f1a\u66f4\u5feb\uff0c\u4f46\u5982\u679c\u4f60\u8981\u5bf9\u4e00\u4e2a key \u96c6\u5408\u8fdb\u884c\u6709\u5e8f\u7684\u904d\u5386\uff0c\u90a3 TreeMap \u662f\u66f4\u597d\u7684\u9009\u62e9\u3002<\/p>\n\n\n\n
23. \u8bf4\u4e00\u4e0b HashMap \u7684\u5b9e\u73b0\u539f\u7406\uff1f<\/h4>\n\n\n\n
HashMap \u57fa\u4e8e Hash \u7b97\u6cd5\u5b9e\u73b0\u7684\uff0c\u6211\u4eec\u901a\u8fc7 put(key,value)\u5b58\u50a8\uff0cget(key)\u6765\u83b7\u53d6\u3002\u5f53\u4f20\u5165 key \u65f6\uff0cHashMap \u4f1a\u6839\u636e key. hashCode() \u8ba1\u7b97\u51fa hash \u503c\uff0c\u6839\u636e hash \u503c\u5c06 value \u4fdd\u5b58\u5728 bucket \u91cc\u3002\u5f53\u8ba1\u7b97\u51fa\u7684 hash \u503c\u76f8\u540c\u65f6\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a hash \u51b2\u7a81\uff0cHashMap \u7684\u505a\u6cd5\u662f\u7528\u94fe\u8868\u548c\u7ea2\u9ed1\u6811\u5b58\u50a8\u76f8\u540c hash \u503c\u7684 value\u3002\u5f53 hash \u51b2\u7a81\u7684\u4e2a\u6570\u6bd4\u8f83\u5c11\u65f6\uff0c\u4f7f\u7528\u94fe\u8868\u5426\u5219\u4f7f\u7528\u7ea2\u9ed1\u6811\u3002<\/p>\n\n\n\n
24. \u8bf4\u4e00\u4e0b HashSet \u7684\u5b9e\u73b0\u539f\u7406\uff1f<\/h4>\n\n\n\n
HashSet \u662f\u57fa\u4e8e HashMap \u5b9e\u73b0\u7684\uff0cHashSet \u5e95\u5c42\u4f7f\u7528 HashMap \u6765\u4fdd\u5b58\u6240\u6709\u5143\u7d20\uff0c\u56e0\u6b64 HashSet \u7684\u5b9e\u73b0\u6bd4\u8f83\u7b80\u5355\uff0c\u76f8\u5173 HashSet \u7684\u64cd\u4f5c\uff0c\u57fa\u672c\u4e0a\u90fd\u662f\u76f4\u63a5\u8c03\u7528\u5e95\u5c42 HashMap \u7684\u76f8\u5173\u65b9\u6cd5\u6765\u5b8c\u6210\uff0cHashSet \u4e0d\u5141\u8bb8\u91cd\u590d\u7684\u503c\u3002<\/p>\n\n\n\n
25. ArrayList \u548c LinkedList \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
- \u6570\u636e\u7ed3\u6784\u5b9e\u73b0\uff1aArrayList \u662f\u52a8\u6001\u6570\u7ec4\u7684\u6570\u636e\u7ed3\u6784\u5b9e\u73b0\uff0c\u800c LinkedList \u662f\u53cc\u5411\u94fe\u8868\u7684\u6570\u636e\u7ed3\u6784\u5b9e\u73b0\u3002<\/li>
- \u968f\u673a\u8bbf\u95ee\u6548\u7387\uff1aArrayList \u6bd4 LinkedList \u5728\u968f\u673a\u8bbf\u95ee\u7684\u65f6\u5019\u6548\u7387\u8981\u9ad8\uff0c\u56e0\u4e3a LinkedList \u662f\u7ebf\u6027\u7684\u6570\u636e\u5b58\u50a8\u65b9\u5f0f\uff0c\u6240\u4ee5\u9700\u8981\u79fb\u52a8\u6307\u9488\u4ece\u524d\u5f80\u540e\u4f9d\u6b21\u67e5\u627e\u3002<\/li>
- \u589e\u52a0\u548c\u5220\u9664\u6548\u7387\uff1a\u5728\u975e\u9996\u5c3e\u7684\u589e\u52a0\u548c\u5220\u9664\u64cd\u4f5c\uff0cLinkedList \u8981\u6bd4 ArrayList \u6548\u7387\u8981\u9ad8\uff0c\u56e0\u4e3a ArrayList \u589e\u5220\u64cd\u4f5c\u8981\u5f71\u54cd\u6570\u7ec4\u5185\u7684\u5176\u4ed6\u6570\u636e\u7684\u4e0b\u6807\u3002<\/li><\/ul>\n\n\n\n
\u7efc\u5408\u6765\u8bf4\uff0c\u5728\u9700\u8981\u9891\u7e41\u8bfb\u53d6\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u65f6\uff0c\u66f4\u63a8\u8350\u4f7f\u7528 ArrayList\uff0c\u800c\u5728\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u8f83\u591a\u65f6\uff0c\u66f4\u63a8\u8350\u4f7f\u7528 LinkedList\u3002<\/p>\n\n\n\n
26. \u5982\u4f55\u5b9e\u73b0\u6570\u7ec4\u548c List \u4e4b\u95f4\u7684\u8f6c\u6362\uff1f<\/h4>\n\n\n\n
- \u6570\u7ec4\u8f6c List\uff1a\u4f7f\u7528 Arrays. asList(array) \u8fdb\u884c\u8f6c\u6362\u3002<\/li>
- List \u8f6c\u6570\u7ec4\uff1a\u4f7f\u7528 List \u81ea\u5e26\u7684 toArray() \u65b9\u6cd5\u3002<\/li><\/ul>\n\n\n\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n\n\n\n
\/\/ list to array\nList<String> list = new ArrayList<String>();\nlist. add(\"\u4e1a\u4f59\u8349\");\nlist. add(\"\u7684\u535a\u5ba2\");\nlist. toArray();\n\/\/ array to list\nString[] array = new String[]{\"\u4e1a\u4f59\u8349\",\"\u7684\u535a\u5ba2\"};\nArrays. asList(array);<\/code><\/pre>\n\n\n\n27. ArrayList \u548c Vector \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
- \u7ebf\u7a0b\u5b89\u5168\uff1aVector \u4f7f\u7528\u4e86 Synchronized \u6765\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65\uff0c\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800c ArrayList \u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/li>
- \u6027\u80fd\uff1aArrayList \u5728\u6027\u80fd\u65b9\u9762\u8981\u4f18\u4e8e Vector\u3002<\/li>
- \u6269\u5bb9\uff1aArrayList \u548c Vector \u90fd\u4f1a\u6839\u636e\u5b9e\u9645\u7684\u9700\u8981\u52a8\u6001\u7684\u8c03\u6574\u5bb9\u91cf\uff0c\u53ea\u4e0d\u8fc7\u5728 Vector \u6269\u5bb9\u6bcf\u6b21\u4f1a\u589e\u52a0 1 \u500d\uff0c\u800c ArrayList \u53ea\u4f1a\u589e\u52a0 50%\u3002<\/li><\/ul>\n\n\n\n
28. Array \u548c ArrayList \u6709\u4f55\u533a\u522b\uff1f<\/h4>\n\n\n\n
- Array \u53ef\u4ee5\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u5bf9\u8c61\uff0cArrayList \u53ea\u80fd\u5b58\u50a8\u5bf9\u8c61\u3002<\/li>
- Array \u662f\u6307\u5b9a\u56fa\u5b9a\u5927\u5c0f\u7684\uff0c\u800c ArrayList \u5927\u5c0f\u662f\u81ea\u52a8\u6269\u5c55\u7684\u3002<\/li>
- Array \u5185\u7f6e\u65b9\u6cd5\u6ca1\u6709 ArrayList \u591a\uff0c\u6bd4\u5982 addAll\u3001removeAll\u3001iteration \u7b49\u65b9\u6cd5\u53ea\u6709 ArrayList \u6709\u3002<\/li><\/ul>\n\n\n\n
29. \u5728 Queue \u4e2d poll()\u548c remove()\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- \u76f8\u540c\u70b9\uff1a\u90fd\u662f\u8fd4\u56de\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c\u5e76\u5728\u961f\u5217\u4e2d\u5220\u9664\u8fd4\u56de\u7684\u5bf9\u8c61\u3002<\/li>
- \u4e0d\u540c\u70b9\uff1a\u5982\u679c\u6ca1\u6709\u5143\u7d20 poll()\u4f1a\u8fd4\u56de null\uff0c\u800c remove()\u4f1a\u76f4\u63a5\u629b\u51fa NoSuchElementException \u5f02\u5e38\u3002<\/li><\/ul>\n\n\n\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n\n\n\n
Queue<String> queue = new LinkedList<String>();\nqueue. offer(\"string\"); \/\/ add\nSystem. out. println(queue. poll());\nSystem. out. println(queue. remove());\nSystem. out. println(queue. size());<\/code><\/pre>\n\n\n\n30. \u54ea\u4e9b\u96c6\u5408\u7c7b\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff1f<\/h4>\n\n\n\n
Vector\u3001Hashtable\u3001Stack \u90fd\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u800c\u50cf HashMap \u5219\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4e0d\u8fc7\u5728 JDK 1.5 \u4e4b\u540e\u968f\u7740 Java. util. concurrent \u5e76\u53d1\u5305\u7684\u51fa\u73b0\uff0c\u5b83\u4eec\u4e5f\u6709\u4e86\u81ea\u5df1\u5bf9\u5e94\u7684\u7ebf\u7a0b\u5b89\u5168\u7c7b\uff0c\u6bd4\u5982 HashMap \u5bf9\u5e94\u7684\u7ebf\u7a0b\u5b89\u5168\u7c7b\u5c31\u662f ConcurrentHashMap\u3002<\/p>\n\n\n\n
31. \u8fed\u4ee3\u5668 Iterator \u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
Iterator \u63a5\u53e3\u63d0\u4f9b\u904d\u5386\u4efb\u4f55 Collection \u7684\u63a5\u53e3\u3002\u6211\u4eec\u53ef\u4ee5\u4ece\u4e00\u4e2a Collection \u4e2d\u4f7f\u7528\u8fed\u4ee3\u5668\u65b9\u6cd5\u6765\u83b7\u53d6\u8fed\u4ee3\u5668\u5b9e\u4f8b\u3002\u8fed\u4ee3\u5668\u53d6\u4ee3\u4e86 Java \u96c6\u5408\u6846\u67b6\u4e2d\u7684 Enumeration\uff0c\u8fed\u4ee3\u5668\u5141\u8bb8\u8c03\u7528\u8005\u5728\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u79fb\u9664\u5143\u7d20\u3002<\/p>\n\n\n\n
32. Iterator \u600e\u4e48\u4f7f\u7528\uff1f\u6709\u4ec0\u4e48\u7279\u70b9\uff1f<\/h4>\n\n\n\n
Iterator \u4f7f\u7528\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
List<String> list = new ArrayList<>();\nIterator<String> it = list. iterator();\nwhile(it. hasNext()){\n String obj = it. next();\n System. out. println(obj);\n}<\/code><\/pre>\n\n\n\nIterator \u7684\u7279\u70b9\u662f\u66f4\u52a0\u5b89\u5168\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u786e\u4fdd\uff0c\u5728\u5f53\u524d\u904d\u5386\u7684\u96c6\u5408\u5143\u7d20\u88ab\u66f4\u6539\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u629b\u51fa ConcurrentModificationException \u5f02\u5e38\u3002<\/p>\n\n\n\n
33. Iterator \u548c ListIterator \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- Iterator \u53ef\u4ee5\u904d\u5386 Set \u548c List \u96c6\u5408\uff0c\u800c ListIterator \u53ea\u80fd\u904d\u5386 List\u3002<\/li>
- Iterator \u53ea\u80fd\u5355\u5411\u904d\u5386\uff0c\u800c ListIterator \u53ef\u4ee5\u53cc\u5411\u904d\u5386\uff08\u5411\u524d\/\u540e\u904d\u5386\uff09\u3002<\/li>
- ListIterator \u4ece Iterator \u63a5\u53e3\u7ee7\u627f\uff0c\u7136\u540e\u6dfb\u52a0\u4e86\u4e00\u4e9b\u989d\u5916\u7684\u529f\u80fd\uff0c\u6bd4\u5982\u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20\u3001\u66ff\u6362\u4e00\u4e2a\u5143\u7d20\u3001\u83b7\u53d6\u524d\u9762\u6216\u540e\u9762\u5143\u7d20\u7684\u7d22\u5f15\u4f4d\u7f6e\u3002<\/li><\/ul>\n\n\n\n
34. \u600e\u4e48\u786e\u4fdd\u4e00\u4e2a\u96c6\u5408\u4e0d\u80fd\u88ab\u4fee\u6539\uff1f<\/h4>\n\n\n\n
\u53ef\u4ee5\u4f7f\u7528 Collections. unmodifiableCollection(Collection c) \u65b9\u6cd5\u6765\u521b\u5efa\u4e00\u4e2a\u53ea\u8bfb\u96c6\u5408\uff0c\u8fd9\u6837\u6539\u53d8\u96c6\u5408\u7684\u4efb\u4f55\u64cd\u4f5c\u90fd\u4f1a\u629b\u51fa Java. lang. UnsupportedOperationException \u5f02\u5e38\u3002<\/p>\n\n\n\n
\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
List<String> list = new ArrayList<>();\nlist. add(\"x\");\nCollection<String> clist = Collections. unmodifiableCollection(list);\nclist. add(\"y\"); \/\/ \u8fd0\u884c\u65f6\u6b64\u884c\u62a5\u9519\nSystem. out. println(list. size());<\/code><\/pre>\n\n\n\n\u591a\u7ebf\u7a0b<\/h3>\n\n\n\n
35. \u5e76\u884c\u548c\u5e76\u53d1\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- \u5e76\u884c\uff1a\u591a\u4e2a\u5904\u7406\u5668\u6216\u591a\u6838\u5904\u7406\u5668\u540c\u65f6\u5904\u7406\u591a\u4e2a\u4efb\u52a1\u3002<\/li>
- \u5e76\u53d1\uff1a\u591a\u4e2a\u4efb\u52a1\u5728\u540c\u4e00\u4e2a CPU \u6838\u4e0a\uff0c\u6309\u7ec6\u5206\u7684\u65f6\u95f4\u7247\u8f6e\u6d41(\u4ea4\u66ff)\u6267\u884c\uff0c\u4ece\u903b\u8f91\u4e0a\u6765\u770b\u90a3\u4e9b\u4efb\u52a1\u662f\u540c\u65f6\u6267\u884c\u3002<\/li><\/ul>\n\n\n\n
\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n
\u5e76\u884c\u548c\u5e76\u53d1\u7684\u533a\u522b<\/figcaption><\/figure><\/div>\n\n\n\n \u5e76\u53d1 = \u4e24\u4e2a\u961f\u5217\u548c\u4e00\u53f0\u5496\u5561\u673a\u3002<\/p>\n\n\n\n
\u5e76\u884c = \u4e24\u4e2a\u961f\u5217\u548c\u4e24\u53f0\u5496\u5561\u673a\u3002<\/p>\n\n\n\n
36. \u7ebf\u7a0b\u548c\u8fdb\u7a0b\u7684\u533a\u522b\uff1f<\/h4>\n\n\n\n
\u4e00\u4e2a\u7a0b\u5e8f\u4e0b\u81f3\u5c11\u6709\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u4e0b\u81f3\u5c11\u6709\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u4e0b\u4e5f\u53ef\u4ee5\u6709\u591a\u4e2a\u7ebf\u7a0b\u6765\u589e\u52a0\u7a0b\u5e8f\u7684\u6267\u884c\u901f\u5ea6\u3002<\/p>\n\n\n\n
37. \u5b88\u62a4\u7ebf\u7a0b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
\u5b88\u62a4\u7ebf\u7a0b\u662f\u8fd0\u884c\u5728\u540e\u53f0\u7684\u4e00\u79cd\u7279\u6b8a\u8fdb\u7a0b\u3002\u5b83\u72ec\u7acb\u4e8e\u63a7\u5236\u7ec8\u7aef\u5e76\u4e14\u5468\u671f\u6027\u5730\u6267\u884c\u67d0\u79cd\u4efb\u52a1\u6216\u7b49\u5f85\u5904\u7406\u67d0\u4e9b\u53d1\u751f\u7684\u4e8b\u4ef6\u3002\u5728 Java \u4e2d\u5783\u573e\u56de\u6536\u7ebf\u7a0b\u5c31\u662f\u7279\u6b8a\u7684\u5b88\u62a4\u7ebf\u7a0b\u3002<\/p>\n\n\n\n
38. \u521b\u5efa\u7ebf\u7a0b\u6709\u54ea\u51e0\u79cd\u65b9\u5f0f\uff1f<\/h4>\n\n\n\n
\u521b\u5efa\u7ebf\u7a0b\u6709\u4e09\u79cd\u65b9\u5f0f\uff1a<\/p>\n\n\n\n
- \u7ee7\u627f Thread \u91cd\u5199 run \u65b9\u6cd5\uff1b<\/li>
- \u5b9e\u73b0 Runnable \u63a5\u53e3\uff1b<\/li>
- \u5b9e\u73b0 Callable \u63a5\u53e3\u3002<\/li><\/ul>\n\n\n\n
39. \u8bf4\u4e00\u4e0b runnable \u548c callable \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
runnable \u6ca1\u6709\u8fd4\u56de\u503c\uff0ccallable \u53ef\u4ee5\u62ff\u5230\u6709\u8fd4\u56de\u503c\uff0ccallable \u53ef\u4ee5\u770b\u4f5c\u662f runnable \u7684\u8865\u5145\u3002<\/p>\n\n\n\n
40. \u7ebf\u7a0b\u6709\u54ea\u4e9b\u72b6\u6001\uff1f<\/h4>\n\n\n\n
\u7ebf\u7a0b\u7684\u72b6\u6001\uff1a<\/p>\n\n\n\n
- NEW \u5c1a\u672a\u542f\u52a8<\/li>
- RUNNABLE \u6b63\u5728\u6267\u884c\u4e2d<\/li>
- BLOCKED \u963b\u585e\u7684\uff08\u88ab\u540c\u6b65\u9501\u6216\u8005IO\u9501\u963b\u585e\uff09<\/li>
- WAITING \u6c38\u4e45\u7b49\u5f85\u72b6\u6001<\/li>
- TIMED_WAITING \u7b49\u5f85\u6307\u5b9a\u7684\u65f6\u95f4\u91cd\u65b0\u88ab\u5524\u9192\u7684\u72b6\u6001<\/li>
- TERMINATED \u6267\u884c\u5b8c\u6210<\/li><\/ul>\n\n\n\n
41. sleep() \u548c wait() \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- \u7c7b\u7684\u4e0d\u540c\uff1asleep() \u6765\u81ea Thread\uff0cwait() \u6765\u81ea Object\u3002<\/li>
- \u91ca\u653e\u9501\uff1asleep() \u4e0d\u91ca\u653e\u9501\uff1bwait() \u91ca\u653e\u9501\u3002<\/li>
- \u7528\u6cd5\u4e0d\u540c\uff1asleep() \u65f6\u95f4\u5230\u4f1a\u81ea\u52a8\u6062\u590d\uff1bwait() \u53ef\u4ee5\u4f7f\u7528 notify()\/notifyAll()\u76f4\u63a5\u5524\u9192\u3002<\/li><\/ul>\n\n\n\n
42. notify()\u548c notifyAll()\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
notifyAll()\u4f1a\u5524\u9192\u6240\u6709\u7684\u7ebf\u7a0b\uff0cnotify()\u4e4b\u540e\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b\u3002notifyAll() \u8c03\u7528\u540e\uff0c\u4f1a\u5c06\u5168\u90e8\u7ebf\u7a0b\u7531\u7b49\u5f85\u6c60\u79fb\u5230\u9501\u6c60\uff0c\u7136\u540e\u53c2\u4e0e\u9501\u7684\u7ade\u4e89\uff0c\u7ade\u4e89\u6210\u529f\u5219\u7ee7\u7eed\u6267\u884c\uff0c\u5982\u679c\u4e0d\u6210\u529f\u5219\u7559\u5728\u9501\u6c60\u7b49\u5f85\u9501\u88ab\u91ca\u653e\u540e\u518d\u6b21\u53c2\u4e0e\u7ade\u4e89\u3002\u800c notify()\u53ea\u4f1a\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u5177\u4f53\u5524\u9192\u54ea\u4e00\u4e2a\u7ebf\u7a0b\u7531\u865a\u62df\u673a\u63a7\u5236\u3002<\/p>\n\n\n\n
43. \u7ebf\u7a0b\u7684 run() \u548c start() \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
start() \u65b9\u6cd5\u7528\u4e8e\u542f\u52a8\u7ebf\u7a0b\uff0crun() \u65b9\u6cd5\u7528\u4e8e\u6267\u884c\u7ebf\u7a0b\u7684\u8fd0\u884c\u65f6\u4ee3\u7801\u3002run() \u53ef\u4ee5\u91cd\u590d\u8c03\u7528\uff0c\u800c start() \u53ea\u80fd\u8c03\u7528\u4e00\u6b21\u3002<\/p>\n\n\n\n
44. \u521b\u5efa\u7ebf\u7a0b\u6c60\u6709\u54ea\u51e0\u79cd\u65b9\u5f0f\uff1f<\/h4>\n\n\n\n
\u7ebf\u7a0b\u6c60\u521b\u5efa\u6709\u4e03\u79cd\u65b9\u5f0f\uff0c\u6700\u6838\u5fc3\u7684\u662f\u6700\u540e\u4e00\u79cd\uff1a<\/p>\n\n\n\n
- newSingleThreadExecutor()\uff1a\u5b83\u7684\u7279\u70b9\u5728\u4e8e\u5de5\u4f5c\u7ebf\u7a0b\u6570\u76ee\u88ab\u9650\u5236\u4e3a 1\uff0c\u64cd\u4f5c\u4e00\u4e2a\u65e0\u754c\u7684\u5de5\u4f5c\u961f\u5217\uff0c\u6240\u4ee5\u5b83\u4fdd\u8bc1\u4e86\u6240\u6709\u4efb\u52a1\u7684\u90fd\u662f\u88ab\u987a\u5e8f\u6267\u884c\uff0c\u6700\u591a\u4f1a\u6709\u4e00\u4e2a\u4efb\u52a1\u5904\u4e8e\u6d3b\u52a8\u72b6\u6001\uff0c\u5e76\u4e14\u4e0d\u5141\u8bb8\u4f7f\u7528\u8005\u6539\u52a8\u7ebf\u7a0b\u6c60\u5b9e\u4f8b\uff0c\u56e0\u6b64\u53ef\u4ee5\u907f\u514d\u5176\u6539\u53d8\u7ebf\u7a0b\u6570\u76ee\uff1b<\/li>
- newCachedThreadPool()\uff1a\u5b83\u662f\u4e00\u79cd\u7528\u6765\u5904\u7406\u5927\u91cf\u77ed\u65f6\u95f4\u5de5\u4f5c\u4efb\u52a1\u7684\u7ebf\u7a0b\u6c60\uff0c\u5177\u6709\u51e0\u4e2a\u9c9c\u660e\u7279\u70b9\uff1a\u5b83\u4f1a\u8bd5\u56fe\u7f13\u5b58\u7ebf\u7a0b\u5e76\u91cd\u7528\uff0c\u5f53\u65e0\u7f13\u5b58\u7ebf\u7a0b\u53ef\u7528\u65f6\uff0c\u5c31\u4f1a\u521b\u5efa\u65b0\u7684\u5de5\u4f5c\u7ebf\u7a0b\uff1b\u5982\u679c\u7ebf\u7a0b\u95f2\u7f6e\u7684\u65f6\u95f4\u8d85\u8fc7 60 \u79d2\uff0c\u5219\u88ab\u7ec8\u6b62\u5e76\u79fb\u51fa\u7f13\u5b58\uff1b\u957f\u65f6\u95f4\u95f2\u7f6e\u65f6\uff0c\u8fd9\u79cd\u7ebf\u7a0b\u6c60\uff0c\u4e0d\u4f1a\u6d88\u8017\u4ec0\u4e48\u8d44\u6e90\u3002\u5176\u5185\u90e8\u4f7f\u7528 SynchronousQueue \u4f5c\u4e3a\u5de5\u4f5c\u961f\u5217\uff1b<\/li>
- newFixedThreadPool(int nThreads)\uff1a\u91cd\u7528\u6307\u5b9a\u6570\u76ee\uff08nThreads\uff09\u7684\u7ebf\u7a0b\uff0c\u5176\u80cc\u540e\u4f7f\u7528\u7684\u662f\u65e0\u754c\u7684\u5de5\u4f5c\u961f\u5217\uff0c\u4efb\u4f55\u65f6\u5019\u6700\u591a\u6709 nThreads \u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u662f\u6d3b\u52a8\u7684\u3002\u8fd9\u610f\u5473\u7740\uff0c\u5982\u679c\u4efb\u52a1\u6570\u91cf\u8d85\u8fc7\u4e86\u6d3b\u52a8\u961f\u5217\u6570\u76ee\uff0c\u5c06\u5728\u5de5\u4f5c\u961f\u5217\u4e2d\u7b49\u5f85\u7a7a\u95f2\u7ebf\u7a0b\u51fa\u73b0\uff1b\u5982\u679c\u6709\u5de5\u4f5c\u7ebf\u7a0b\u9000\u51fa\uff0c\u5c06\u4f1a\u6709\u65b0\u7684\u5de5\u4f5c\u7ebf\u7a0b\u88ab\u521b\u5efa\uff0c\u4ee5\u8865\u8db3\u6307\u5b9a\u7684\u6570\u76ee nThreads\uff1b<\/li>
- newSingleThreadScheduledExecutor()\uff1a\u521b\u5efa\u5355\u7ebf\u7a0b\u6c60\uff0c\u8fd4\u56de ScheduledExecutorService\uff0c\u53ef\u4ee5\u8fdb\u884c\u5b9a\u65f6\u6216\u5468\u671f\u6027\u7684\u5de5\u4f5c\u8c03\u5ea6\uff1b<\/li>
- newScheduledThreadPool(int corePoolSize)\uff1a\u548cnewSingleThreadScheduledExecutor()\u7c7b\u4f3c\uff0c\u521b\u5efa\u7684\u662f\u4e2a ScheduledExecutorService\uff0c\u53ef\u4ee5\u8fdb\u884c\u5b9a\u65f6\u6216\u5468\u671f\u6027\u7684\u5de5\u4f5c\u8c03\u5ea6\uff0c\u533a\u522b\u5728\u4e8e\u5355\u4e00\u5de5\u4f5c\u7ebf\u7a0b\u8fd8\u662f\u591a\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\uff1b<\/li>
- newWorkStealingPool(int parallelism)\uff1a\u8fd9\u662f\u4e00\u4e2a\u7ecf\u5e38\u88ab\u4eba\u5ffd\u7565\u7684\u7ebf\u7a0b\u6c60\uff0cJava 8 \u624d\u52a0\u5165\u8fd9\u4e2a\u521b\u5efa\u65b9\u6cd5\uff0c\u5176\u5185\u90e8\u4f1a\u6784\u5efaForkJoinPool\uff0c\u5229\u7528Work-Stealing\u7b97\u6cd5\uff0c\u5e76\u884c\u5730\u5904\u7406\u4efb\u52a1\uff0c\u4e0d\u4fdd\u8bc1\u5904\u7406\u987a\u5e8f\uff1b<\/li>
- ThreadPoolExecutor()\uff1a\u662f\u6700\u539f\u59cb\u7684\u7ebf\u7a0b\u6c60\u521b\u5efa\uff0c\u4e0a\u97621-3\u521b\u5efa\u65b9\u5f0f\u90fd\u662f\u5bf9ThreadPoolExecutor\u7684\u5c01\u88c5\u3002<\/li><\/ul>\n\n\n\n
45. \u7ebf\u7a0b\u6c60\u90fd\u6709\u54ea\u4e9b\u72b6\u6001\uff1f<\/h4>\n\n\n\n
- RUNNING\uff1a\u8fd9\u662f\u6700\u6b63\u5e38\u7684\u72b6\u6001\uff0c\u63a5\u53d7\u65b0\u7684\u4efb\u52a1\uff0c\u5904\u7406\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4efb\u52a1\u3002<\/li>
- SHUTDOWN\uff1a\u4e0d\u63a5\u53d7\u65b0\u7684\u4efb\u52a1\u63d0\u4ea4\uff0c\u4f46\u662f\u4f1a\u7ee7\u7eed\u5904\u7406\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4efb\u52a1\u3002<\/li>
- STOP\uff1a\u4e0d\u63a5\u53d7\u65b0\u7684\u4efb\u52a1\u63d0\u4ea4\uff0c\u4e0d\u518d\u5904\u7406\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4efb\u52a1\uff0c\u4e2d\u65ad\u6b63\u5728\u6267\u884c\u4efb\u52a1\u7684\u7ebf\u7a0b\u3002<\/li>
- TIDYING\uff1a\u6240\u6709\u7684\u4efb\u52a1\u90fd\u9500\u6bc1\u4e86\uff0cworkCount \u4e3a 0\uff0c\u7ebf\u7a0b\u6c60\u7684\u72b6\u6001\u5728\u8f6c\u6362\u4e3a TIDYING \u72b6\u6001\u65f6\uff0c\u4f1a\u6267\u884c\u94a9\u5b50\u65b9\u6cd5 terminated()\u3002<\/li>
- TERMINATED\uff1aterminated()\u65b9\u6cd5\u7ed3\u675f\u540e\uff0c\u7ebf\u7a0b\u6c60\u7684\u72b6\u6001\u5c31\u4f1a\u53d8\u6210\u8fd9\u4e2a\u3002<\/li><\/ul>\n\n\n\n
46. \u7ebf\u7a0b\u6c60\u4e2d submit() \u548c execute() \u65b9\u6cd5\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- execute()\uff1a\u53ea\u80fd\u6267\u884c Runnable \u7c7b\u578b\u7684\u4efb\u52a1\u3002<\/li>
- submit()\uff1a\u53ef\u4ee5\u6267\u884c Runnable \u548c Callable \u7c7b\u578b\u7684\u4efb\u52a1\u3002<\/li><\/ul>\n\n\n\n
Callable \u7c7b\u578b\u7684\u4efb\u52a1\u53ef\u4ee5\u83b7\u53d6\u6267\u884c\u7684\u8fd4\u56de\u503c\uff0c\u800c Runnable \u6267\u884c\u65e0\u8fd4\u56de\u503c\u3002<\/p>\n\n\n\n
47. \u5728 Java \u7a0b\u5e8f\u4e2d\u600e\u4e48\u4fdd\u8bc1\u591a\u7ebf\u7a0b\u7684\u8fd0\u884c\u5b89\u5168\uff1f<\/h4>\n\n\n\n
- \u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528\u5b89\u5168\u7c7b\uff0c\u6bd4\u5982 Java. util. concurrent \u4e0b\u7684\u7c7b\u3002<\/li>
- \u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528\u81ea\u52a8\u9501 synchronized\u3002<\/li>
- \u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528\u624b\u52a8\u9501 Lock\u3002<\/li><\/ul>\n\n\n\n
\u624b\u52a8\u9501 Java \u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
Lock lock = new ReentrantLock();\nlock. lock();\ntry {\n System. out. println(\"\u83b7\u5f97\u9501\");\n} catch (Exception e) {\n \/\/ TODO: handle exception\n} finally {\n System. out. println(\"\u91ca\u653e\u9501\");\n lock. unlock();\n}<\/code><\/pre>\n\n\n\n48. \u591a\u7ebf\u7a0b\u4e2d synchronized \u9501\u5347\u7ea7\u7684\u539f\u7406\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
synchronized \u9501\u5347\u7ea7\u539f\u7406\uff1a\u5728\u9501\u5bf9\u8c61\u7684\u5bf9\u8c61\u5934\u91cc\u9762\u6709\u4e00\u4e2a threadid \u5b57\u6bb5\uff0c\u5728\u7b2c\u4e00\u6b21\u8bbf\u95ee\u7684\u65f6\u5019 threadid \u4e3a\u7a7a\uff0cjvm \u8ba9\u5176\u6301\u6709\u504f\u5411\u9501\uff0c\u5e76\u5c06 threadid \u8bbe\u7f6e\u4e3a\u5176\u7ebf\u7a0b id\uff0c\u518d\u6b21\u8fdb\u5165\u7684\u65f6\u5019\u4f1a\u5148\u5224\u65ad threadid \u662f\u5426\u4e0e\u5176\u7ebf\u7a0b id \u4e00\u81f4\uff0c\u5982\u679c\u4e00\u81f4\u5219\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u6b64\u5bf9\u8c61\uff0c\u5982\u679c\u4e0d\u4e00\u81f4\uff0c\u5219\u5347\u7ea7\u504f\u5411\u9501\u4e3a\u8f7b\u91cf\u7ea7\u9501\uff0c\u901a\u8fc7\u81ea\u65cb\u5faa\u73af\u4e00\u5b9a\u6b21\u6570\u6765\u83b7\u53d6\u9501\uff0c\u6267\u884c\u4e00\u5b9a\u6b21\u6570\u4e4b\u540e\uff0c\u5982\u679c\u8fd8\u6ca1\u6709\u6b63\u5e38\u83b7\u53d6\u5230\u8981\u4f7f\u7528\u7684\u5bf9\u8c61\uff0c\u6b64\u65f6\u5c31\u4f1a\u628a\u9501\u4ece\u8f7b\u91cf\u7ea7\u5347\u7ea7\u4e3a\u91cd\u91cf\u7ea7\u9501\uff0c\u6b64\u8fc7\u7a0b\u5c31\u6784\u6210\u4e86 synchronized \u9501\u7684\u5347\u7ea7\u3002<\/p>\n\n\n\n
\u9501\u7684\u5347\u7ea7\u7684\u76ee\u7684\uff1a\u9501\u5347\u7ea7\u662f\u4e3a\u4e86\u51cf\u4f4e\u4e86\u9501\u5e26\u6765\u7684\u6027\u80fd\u6d88\u8017\u3002\u5728 Java 6 \u4e4b\u540e\u4f18\u5316 synchronized \u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u4f7f\u7528\u4e86\u504f\u5411\u9501\u5347\u7ea7\u4e3a\u8f7b\u91cf\u7ea7\u9501\u518d\u5347\u7ea7\u5230\u91cd\u91cf\u7ea7\u9501\u7684\u65b9\u5f0f\uff0c\u4ece\u800c\u51cf\u4f4e\u4e86\u9501\u5e26\u6765\u7684\u6027\u80fd\u6d88\u8017\u3002<\/p>\n\n\n\n
49. \u4ec0\u4e48\u662f\u6b7b\u9501\uff1f<\/h4>\n\n\n\n
\u5f53\u7ebf\u7a0b A \u6301\u6709\u72ec\u5360\u9501a\uff0c\u5e76\u5c1d\u8bd5\u53bb\u83b7\u53d6\u72ec\u5360\u9501 b \u7684\u540c\u65f6\uff0c\u7ebf\u7a0b B \u6301\u6709\u72ec\u5360\u9501 b\uff0c\u5e76\u5c1d\u8bd5\u83b7\u53d6\u72ec\u5360\u9501 a \u7684\u60c5\u51b5\u4e0b\uff0c\u5c31\u4f1a\u53d1\u751f AB \u4e24\u4e2a\u7ebf\u7a0b\u7531\u4e8e\u4e92\u76f8\u6301\u6709\u5bf9\u65b9\u9700\u8981\u7684\u9501\uff0c\u800c\u53d1\u751f\u7684\u963b\u585e\u73b0\u8c61\uff0c\u6211\u4eec\u79f0\u4e3a\u6b7b\u9501\u3002<\/p>\n\n\n\n
50. \u600e\u4e48\u9632\u6b62\u6b7b\u9501\uff1f<\/h4>\n\n\n\n
- \u5c3d\u91cf\u4f7f\u7528 tryLock(long timeout, TimeUnit unit)\u7684\u65b9\u6cd5(ReentrantLock\u3001ReentrantReadWriteLock)\uff0c\u8bbe\u7f6e\u8d85\u65f6\u65f6\u95f4\uff0c\u8d85\u65f6\u53ef\u4ee5\u9000\u51fa\u9632\u6b62\u6b7b\u9501\u3002<\/li>
- \u5c3d\u91cf\u4f7f\u7528 Java. util. concurrent \u5e76\u53d1\u7c7b\u4ee3\u66ff\u81ea\u5df1\u624b\u5199\u9501\u3002<\/li>
- \u5c3d\u91cf\u964d\u4f4e\u9501\u7684\u4f7f\u7528\u7c92\u5ea6\uff0c\u5c3d\u91cf\u4e0d\u8981\u51e0\u4e2a\u529f\u80fd\u7528\u540c\u4e00\u628a\u9501\u3002<\/li>
- \u5c3d\u91cf\u51cf\u5c11\u540c\u6b65\u7684\u4ee3\u7801\u5757\u3002<\/li><\/ul>\n\n\n\n
51. ThreadLocal \u662f\u4ec0\u4e48\uff1f\u6709\u54ea\u4e9b\u4f7f\u7528\u573a\u666f\uff1f<\/h4>\n\n\n\n
ThreadLocal \u4e3a\u6bcf\u4e2a\u4f7f\u7528\u8be5\u53d8\u91cf\u7684\u7ebf\u7a0b\u63d0\u4f9b\u72ec\u7acb\u7684\u53d8\u91cf\u526f\u672c\uff0c\u6240\u4ee5\u6bcf\u4e00\u4e2a\u7ebf\u7a0b\u90fd\u53ef\u4ee5\u72ec\u7acb\u5730\u6539\u53d8\u81ea\u5df1\u7684\u526f\u672c\uff0c\u800c\u4e0d\u4f1a\u5f71\u54cd\u5176\u5b83\u7ebf\u7a0b\u6240\u5bf9\u5e94\u7684\u526f\u672c\u3002<\/p>\n\n\n\n
ThreadLocal \u7684\u7ecf\u5178\u4f7f\u7528\u573a\u666f\u662f\u6570\u636e\u5e93\u8fde\u63a5\u548c session \u7ba1\u7406\u7b49\u3002<\/p>\n\n\n\n
52. \u8bf4\u4e00\u4e0b synchronized \u5e95\u5c42\u5b9e\u73b0\u539f\u7406\uff1f<\/h4>\n\n\n\n
synchronized \u662f\u7531\u4e00\u5bf9 monitorenter\/monitorexit \u6307\u4ee4\u5b9e\u73b0\u7684\uff0cmonitor \u5bf9\u8c61\u662f\u540c\u6b65\u7684\u57fa\u672c\u5b9e\u73b0\u5355\u5143\u3002\u5728 Java 6 \u4e4b\u524d\uff0cmonitor \u7684\u5b9e\u73b0\u5b8c\u5168\u662f\u4f9d\u9760\u64cd\u4f5c\u7cfb\u7edf\u5185\u90e8\u7684\u4e92\u65a5\u9501\uff0c\u56e0\u4e3a\u9700\u8981\u8fdb\u884c\u7528\u6237\u6001\u5230\u5185\u6838\u6001\u7684\u5207\u6362\uff0c\u6240\u4ee5\u540c\u6b65\u64cd\u4f5c\u662f\u4e00\u4e2a\u65e0\u5dee\u522b\u7684\u91cd\u91cf\u7ea7\u64cd\u4f5c\uff0c\u6027\u80fd\u4e5f\u5f88\u4f4e\u3002\u4f46\u5728 Java 6 \u7684\u65f6\u5019\uff0cJava \u865a\u62df\u673a \u5bf9\u6b64\u8fdb\u884c\u4e86\u5927\u5200\u9614\u65a7\u5730\u6539\u8fdb\uff0c\u63d0\u4f9b\u4e86\u4e09\u79cd\u4e0d\u540c\u7684 monitor \u5b9e\u73b0\uff0c\u4e5f\u5c31\u662f\u5e38\u8bf4\u7684\u4e09\u79cd\u4e0d\u540c\u7684\u9501\uff1a\u504f\u5411\u9501\uff08Biased Locking\uff09\u3001\u8f7b\u91cf\u7ea7\u9501\u548c\u91cd\u91cf\u7ea7\u9501\uff0c\u5927\u5927\u6539\u8fdb\u4e86\u5176\u6027\u80fd\u3002<\/p>\n\n\n\n
53. synchronized \u548c volatile \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
- volatile \u662f\u53d8\u91cf\u4fee\u9970\u7b26\uff1bsynchronized \u662f\u4fee\u9970\u7c7b\u3001\u65b9\u6cd5\u3001\u4ee3\u7801\u6bb5\u3002<\/li>
- volatile \u4ec5\u80fd\u5b9e\u73b0\u53d8\u91cf\u7684\u4fee\u6539\u53ef\u89c1\u6027\uff0c\u4e0d\u80fd\u4fdd\u8bc1\u539f\u5b50\u6027\uff1b\u800c synchronized \u5219\u53ef\u4ee5\u4fdd\u8bc1\u53d8\u91cf\u7684\u4fee\u6539\u53ef\u89c1\u6027\u548c\u539f\u5b50\u6027\u3002<\/li>
- volatile \u4e0d\u4f1a\u9020\u6210\u7ebf\u7a0b\u7684\u963b\u585e\uff1bsynchronized \u53ef\u80fd\u4f1a\u9020\u6210\u7ebf\u7a0b\u7684\u963b\u585e\u3002<\/li><\/ul>\n\n\n\n
54. synchronized \u548c Lock \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- synchronized \u53ef\u4ee5\u7ed9\u7c7b\u3001\u65b9\u6cd5\u3001\u4ee3\u7801\u5757\u52a0\u9501\uff1b\u800c lock \u53ea\u80fd\u7ed9\u4ee3\u7801\u5757\u52a0\u9501\u3002<\/li>
- synchronized \u4e0d\u9700\u8981\u624b\u52a8\u83b7\u53d6\u9501\u548c\u91ca\u653e\u9501\uff0c\u4f7f\u7528\u7b80\u5355\uff0c\u53d1\u751f\u5f02\u5e38\u4f1a\u81ea\u52a8\u91ca\u653e\u9501\uff0c\u4e0d\u4f1a\u9020\u6210\u6b7b\u9501\uff1b\u800c lock \u9700\u8981\u81ea\u5df1\u52a0\u9501\u548c\u91ca\u653e\u9501\uff0c\u5982\u679c\u4f7f\u7528\u4e0d\u5f53\u6ca1\u6709 unLock()\u53bb\u91ca\u653e\u9501\u5c31\u4f1a\u9020\u6210\u6b7b\u9501\u3002<\/li>
- \u901a\u8fc7 Lock \u53ef\u4ee5\u77e5\u9053\u6709\u6ca1\u6709\u6210\u529f\u83b7\u53d6\u9501\uff0c\u800c synchronized \u5374\u65e0\u6cd5\u529e\u5230\u3002<\/li><\/ul>\n\n\n\n
55. synchronized \u548c ReentrantLock \u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
synchronized \u65e9\u671f\u7684\u5b9e\u73b0\u6bd4\u8f83\u4f4e\u6548\uff0c\u5bf9\u6bd4 ReentrantLock\uff0c\u5927\u591a\u6570\u573a\u666f\u6027\u80fd\u90fd\u76f8\u5dee\u8f83\u5927\uff0c\u4f46\u662f\u5728 Java 6 \u4e2d\u5bf9 synchronized \u8fdb\u884c\u4e86\u975e\u5e38\u591a\u7684\u6539\u8fdb\u3002<\/p>\n\n\n\n
\u4e3b\u8981\u533a\u522b\u5982\u4e0b\uff1a<\/p>\n\n\n\n
- ReentrantLock \u4f7f\u7528\u8d77\u6765\u6bd4\u8f83\u7075\u6d3b\uff0c\u4f46\u662f\u5fc5\u987b\u6709\u91ca\u653e\u9501\u7684\u914d\u5408\u52a8\u4f5c\uff1b<\/li>
- ReentrantLock \u5fc5\u987b\u624b\u52a8\u83b7\u53d6\u4e0e\u91ca\u653e\u9501\uff0c\u800c synchronized \u4e0d\u9700\u8981\u624b\u52a8\u91ca\u653e\u548c\u5f00\u542f\u9501\uff1b<\/li>
- ReentrantLock \u53ea\u9002\u7528\u4e8e\u4ee3\u7801\u5757\u9501\uff0c\u800c synchronized \u53ef\u7528\u4e8e\u4fee\u9970\u65b9\u6cd5\u3001\u4ee3\u7801\u5757\u7b49\u3002<\/li><\/ul>\n\n\n\n
56. \u8bf4\u4e00\u4e0b atomic \u7684\u539f\u7406\uff1f<\/h4>\n\n\n\n
atomic \u4e3b\u8981\u5229\u7528 CAS (Compare And Wwap) \u548c volatile \u548c native \u65b9\u6cd5\u6765\u4fdd\u8bc1\u539f\u5b50\u64cd\u4f5c\uff0c\u4ece\u800c\u907f\u514d synchronized \u7684\u9ad8\u5f00\u9500\uff0c\u6267\u884c\u6548\u7387\u5927\u4e3a\u63d0\u5347\u3002<\/p>\n\n\n\n
\u53cd\u5c04<\/h3>\n\n\n\n
57. \u4ec0\u4e48\u662f\u53cd\u5c04\uff1f<\/h4>\n\n\n\n
\u53cd\u5c04\u662f\u5728\u8fd0\u884c\u72b6\u6001\u4e2d\uff0c\u5bf9\u4e8e\u4efb\u610f\u4e00\u4e2a\u7c7b\uff0c\u90fd\u80fd\u591f\u77e5\u9053\u8fd9\u4e2a\u7c7b\u7684\u6240\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\uff1b\u5bf9\u4e8e\u4efb\u610f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u90fd\u80fd\u591f\u8c03\u7528\u5b83\u7684\u4efb\u610f\u4e00\u4e2a\u65b9\u6cd5\u548c\u5c5e\u6027\uff1b\u8fd9\u79cd\u52a8\u6001\u83b7\u53d6\u7684\u4fe1\u606f\u4ee5\u53ca\u52a8\u6001\u8c03\u7528\u5bf9\u8c61\u7684\u65b9\u6cd5\u7684\u529f\u80fd\u79f0\u4e3a Java \u8bed\u8a00\u7684\u53cd\u5c04\u673a\u5236\u3002<\/p>\n\n\n\n
58. \u4ec0\u4e48\u662f Java \u5e8f\u5217\u5316\uff1f\u4ec0\u4e48\u60c5\u51b5\u4e0b\u9700\u8981\u5e8f\u5217\u5316\uff1f<\/h4>\n\n\n\n
Java \u5e8f\u5217\u5316\u662f\u4e3a\u4e86\u4fdd\u5b58\u5404\u79cd\u5bf9\u8c61\u5728\u5185\u5b58\u4e2d\u7684\u72b6\u6001\uff0c\u5e76\u4e14\u53ef\u4ee5\u628a\u4fdd\u5b58\u7684\u5bf9\u8c61\u72b6\u6001\u518d\u8bfb\u51fa\u6765\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u60c5\u51b5\u9700\u8981\u4f7f\u7528 Java \u5e8f\u5217\u5316\uff1a<\/p>\n\n\n\n
- \u60f3\u628a\u7684\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u72b6\u6001\u4fdd\u5b58\u5230\u4e00\u4e2a\u6587\u4ef6\u4e2d\u6216\u8005\u6570\u636e\u5e93\u4e2d\u65f6\u5019\uff1b<\/li>
- \u60f3\u7528\u5957\u63a5\u5b57\u5728\u7f51\u7edc\u4e0a\u4f20\u9001\u5bf9\u8c61\u7684\u65f6\u5019\uff1b<\/li>
- \u60f3\u901a\u8fc7RMI\uff08\u8fdc\u7a0b\u65b9\u6cd5\u8c03\u7528\uff09\u4f20\u8f93\u5bf9\u8c61\u7684\u65f6\u5019\u3002<\/li><\/ul>\n\n\n\n
59. \u52a8\u6001\u4ee3\u7406\u662f\u4ec0\u4e48\uff1f\u6709\u54ea\u4e9b\u5e94\u7528\uff1f<\/h4>\n\n\n\n
\u52a8\u6001\u4ee3\u7406\u662f\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u4ee3\u7406\u7c7b\u3002<\/p>\n\n\n\n
\u52a8\u6001\u4ee3\u7406\u7684\u5e94\u7528\u6709 spring aop\u3001hibernate \u6570\u636e\u67e5\u8be2\u3001\u6d4b\u8bd5\u6846\u67b6\u7684\u540e\u7aef mock\u3001rpc\uff0cJava\u6ce8\u89e3\u5bf9\u8c61\u83b7\u53d6\u7b49\u3002<\/p>\n\n\n\n
60. \u600e\u4e48\u5b9e\u73b0\u52a8\u6001\u4ee3\u7406\uff1f<\/h4>\n\n\n\n
JDK \u539f\u751f\u52a8\u6001\u4ee3\u7406\u548c cglib \u52a8\u6001\u4ee3\u7406\u3002JDK \u539f\u751f\u52a8\u6001\u4ee3\u7406\u662f\u57fa\u4e8e\u63a5\u53e3\u5b9e\u73b0\u7684\uff0c\u800c cglib \u662f\u57fa\u4e8e\u7ee7\u627f\u5f53\u524d\u7c7b\u7684\u5b50\u7c7b\u5b9e\u73b0\u7684\u3002<\/p>\n\n\n\n
\u5bf9\u8c61\u62f7\u8d1d<\/h3>\n\n\n\n
61. \u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u514b\u9686\uff1f<\/h4>\n\n\n\n
\u514b\u9686\u7684\u5bf9\u8c61\u53ef\u80fd\u5305\u542b\u4e00\u4e9b\u5df2\u7ecf\u4fee\u6539\u8fc7\u7684\u5c5e\u6027\uff0c\u800c new \u51fa\u6765\u7684\u5bf9\u8c61\u7684\u5c5e\u6027\u90fd\u8fd8\u662f\u521d\u59cb\u5316\u65f6\u5019\u7684\u503c\uff0c\u6240\u4ee5\u5f53\u9700\u8981\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\u6765\u4fdd\u5b58\u5f53\u524d\u5bf9\u8c61\u7684\u201c\u72b6\u6001\u201d\u5c31\u9760\u514b\u9686\u65b9\u6cd5\u4e86\u3002<\/p>\n\n\n\n
62. \u5982\u4f55\u5b9e\u73b0\u5bf9\u8c61\u514b\u9686\uff1f<\/h4>\n\n\n\n
- \u5b9e\u73b0 Cloneable \u63a5\u53e3\u5e76\u91cd\u5199 Object \u7c7b\u4e2d\u7684 clone() \u65b9\u6cd5\u3002<\/li>
- \u5b9e\u73b0 Serializable \u63a5\u53e3\uff0c\u901a\u8fc7\u5bf9\u8c61\u7684\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u5b9e\u73b0\u514b\u9686\uff0c\u53ef\u4ee5\u5b9e\u73b0\u771f\u6b63\u7684\u6df1\u5ea6\u514b\u9686\u3002<\/li><\/ul>\n\n\n\n
63. \u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
- \u6d45\u514b\u9686\uff1a\u5f53\u5bf9\u8c61\u88ab\u590d\u5236\u65f6\u53ea\u590d\u5236\u5b83\u672c\u8eab\u548c\u5176\u4e2d\u5305\u542b\u7684\u503c\u7c7b\u578b\u7684\u6210\u5458\u53d8\u91cf\uff0c\u800c\u5f15\u7528\u7c7b\u578b\u7684\u6210\u5458\u5bf9\u8c61\u5e76\u6ca1\u6709\u590d\u5236\u3002<\/li>
- \u6df1\u514b\u9686\uff1a\u9664\u4e86\u5bf9\u8c61\u672c\u8eab\u88ab\u590d\u5236\u5916\uff0c\u5bf9\u8c61\u6240\u5305\u542b\u7684\u6240\u6709\u6210\u5458\u53d8\u91cf\u4e5f\u5c06\u590d\u5236\u3002<\/li><\/ul>\n\n\n\n
Java Web<\/h3>\n\n\n\n
64. JSP \u548c servlet \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
JSP \u662f servlet \u6280\u672f\u7684\u6269\u5c55\uff0c\u672c\u8d28\u4e0a\u5c31\u662f servlet \u7684\u7b80\u6613\u65b9\u5f0f\u3002servlet \u548c JSP \u6700\u4e3b\u8981\u7684\u4e0d\u540c\u70b9\u5728\u4e8e\uff0cservlet \u7684\u5e94\u7528\u903b\u8f91\u662f\u5728 Java \u6587\u4ef6\u4e2d\uff0c\u5e76\u4e14\u5b8c\u5168\u4ece\u8868\u793a\u5c42\u4e2d\u7684 html \u91cc\u5206\u79bb\u5f00\u6765\uff0c\u800c JSP \u7684\u60c5\u51b5\u662f Java \u548c html \u53ef\u4ee5\u7ec4\u5408\u6210\u4e00\u4e2a\u6269\u5c55\u540d\u4e3a JSP \u7684\u6587\u4ef6\u3002JSP \u4fa7\u91cd\u4e8e\u89c6\u56fe\uff0cservlet \u4e3b\u8981\u7528\u4e8e\u63a7\u5236\u903b\u8f91\u3002<\/p>\n\n\n\n
65. JSP \u6709\u54ea\u4e9b\u5185\u7f6e\u5bf9\u8c61\uff1f\u4f5c\u7528\u5206\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
JSP \u6709 9 \u5927\u5185\u7f6e\u5bf9\u8c61\uff1a<\/p>\n\n\n\n
- request\uff1a\u5c01\u88c5\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\uff0c\u5176\u4e2d\u5305\u542b\u6765\u81ea get \u6216 post \u8bf7\u6c42\u7684\u53c2\u6570\uff1b<\/li>
- response\uff1a\u5c01\u88c5\u670d\u52a1\u5668\u5bf9\u5ba2\u6237\u7aef\u7684\u54cd\u5e94\uff1b<\/li>
- pageContext\uff1a\u901a\u8fc7\u8be5\u5bf9\u8c61\u53ef\u4ee5\u83b7\u53d6\u5176\u4ed6\u5bf9\u8c61\uff1b<\/li>
- session\uff1a\u5c01\u88c5\u7528\u6237\u4f1a\u8bdd\u7684\u5bf9\u8c61\uff1b<\/li>
- application\uff1a\u5c01\u88c5\u670d\u52a1\u5668\u8fd0\u884c\u73af\u5883\u7684\u5bf9\u8c61\uff1b<\/li>
- out\uff1a\u8f93\u51fa\u670d\u52a1\u5668\u54cd\u5e94\u7684\u8f93\u51fa\u6d41\u5bf9\u8c61\uff1b<\/li>
- config\uff1aWeb \u5e94\u7528\u7684\u914d\u7f6e\u5bf9\u8c61\uff1b<\/li>
- page\uff1aJSP \u9875\u9762\u672c\u8eab\uff08\u76f8\u5f53\u4e8e Java \u7a0b\u5e8f\u4e2d\u7684 this\uff09\uff1b<\/li>
- exception\uff1a\u5c01\u88c5\u9875\u9762\u629b\u51fa\u5f02\u5e38\u7684\u5bf9\u8c61\u3002<\/li><\/ul>\n\n\n\n
66. \u8bf4\u4e00\u4e0b JSP \u7684 4 \u79cd\u4f5c\u7528\u57df\uff1f<\/h4>\n\n\n\n
- page\uff1a\u4ee3\u8868\u4e0e\u4e00\u4e2a\u9875\u9762\u76f8\u5173\u7684\u5bf9\u8c61\u548c\u5c5e\u6027\u3002<\/li>
- request\uff1a\u4ee3\u8868\u4e0e\u5ba2\u6237\u7aef\u53d1\u51fa\u7684\u4e00\u4e2a\u8bf7\u6c42\u76f8\u5173\u7684\u5bf9\u8c61\u548c\u5c5e\u6027\u3002\u4e00\u4e2a\u8bf7\u6c42\u53ef\u80fd\u8de8\u8d8a\u591a\u4e2a\u9875\u9762\uff0c\u6d89\u53ca\u591a\u4e2a Web \u7ec4\u4ef6\uff1b\u9700\u8981\u5728\u9875\u9762\u663e\u793a\u7684\u4e34\u65f6\u6570\u636e\u53ef\u4ee5\u7f6e\u4e8e\u6b64\u4f5c\u7528\u57df\u3002<\/li>
- session\uff1a\u4ee3\u8868\u4e0e\u67d0\u4e2a\u7528\u6237\u4e0e\u670d\u52a1\u5668\u5efa\u7acb\u7684\u4e00\u6b21\u4f1a\u8bdd\u76f8\u5173\u7684\u5bf9\u8c61\u548c\u5c5e\u6027\u3002\u8ddf\u67d0\u4e2a\u7528\u6237\u76f8\u5173\u7684\u6570\u636e\u5e94\u8be5\u653e\u5728\u7528\u6237\u81ea\u5df1\u7684 session \u4e2d\u3002<\/li>
- application\uff1a\u4ee3\u8868\u4e0e\u6574\u4e2a Web \u5e94\u7528\u7a0b\u5e8f\u76f8\u5173\u7684\u5bf9\u8c61\u548c\u5c5e\u6027\uff0c\u5b83\u5b9e\u8d28\u4e0a\u662f\u8de8\u8d8a\u6574\u4e2a Web \u5e94\u7528\u7a0b\u5e8f\uff0c\u5305\u62ec\u591a\u4e2a\u9875\u9762\u3001\u8bf7\u6c42\u548c\u4f1a\u8bdd\u7684\u4e00\u4e2a\u5168\u5c40\u4f5c\u7528\u57df\u3002<\/li><\/ul>\n\n\n\n
67. session \u548c cookie \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- \u5b58\u50a8\u4f4d\u7f6e\u4e0d\u540c\uff1asession \u5b58\u50a8\u5728\u670d\u52a1\u5668\u7aef\uff1bcookie \u5b58\u50a8\u5728\u6d4f\u89c8\u5668\u7aef\u3002<\/li>
- \u5b89\u5168\u6027\u4e0d\u540c\uff1acookie \u5b89\u5168\u6027\u4e00\u822c\uff0c\u5728\u6d4f\u89c8\u5668\u5b58\u50a8\uff0c\u53ef\u4ee5\u88ab\u4f2a\u9020\u548c\u4fee\u6539\u3002<\/li>
- \u5bb9\u91cf\u548c\u4e2a\u6570\u9650\u5236\uff1acookie \u6709\u5bb9\u91cf\u9650\u5236\uff0c\u6bcf\u4e2a\u7ad9\u70b9\u4e0b\u7684 cookie \u4e5f\u6709\u4e2a\u6570\u9650\u5236\u3002<\/li>
- \u5b58\u50a8\u7684\u591a\u6837\u6027\uff1asession \u53ef\u4ee5\u5b58\u50a8\u5728 Redis \u4e2d\u3001\u6570\u636e\u5e93\u4e2d\u3001\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff1b\u800c cookie \u53ea\u80fd\u5b58\u50a8\u5728\u6d4f\u89c8\u5668\u4e2d\u3002<\/li><\/ul>\n\n\n\n
68. \u8bf4\u4e00\u4e0b session \u7684\u5de5\u4f5c\u539f\u7406\uff1f<\/h4>\n\n\n\n
session \u7684\u5de5\u4f5c\u539f\u7406\u662f\u5ba2\u6237\u7aef\u767b\u5f55\u5b8c\u6210\u4e4b\u540e\uff0c\u670d\u52a1\u5668\u4f1a\u521b\u5efa\u5bf9\u5e94\u7684 session\uff0csession \u521b\u5efa\u5b8c\u4e4b\u540e\uff0c\u4f1a\u628a session \u7684 id \u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\uff0c\u5ba2\u6237\u7aef\u518d\u5b58\u50a8\u5230\u6d4f\u89c8\u5668\u4e2d\u3002\u8fd9\u6837\u5ba2\u6237\u7aef\u6bcf\u6b21\u8bbf\u95ee\u670d\u52a1\u5668\u65f6\uff0c\u90fd\u4f1a\u5e26\u7740 sessionid\uff0c\u670d\u52a1\u5668\u62ff\u5230 sessionid \u4e4b\u540e\uff0c\u5728\u5185\u5b58\u627e\u5230\u4e0e\u4e4b\u5bf9\u5e94\u7684 session \u8fd9\u6837\u5c31\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\u4e86\u3002<\/p>\n\n\n\n
69. \u5982\u679c\u5ba2\u6237\u7aef\u7981\u6b62 cookie \u80fd\u5b9e\u73b0 session \u8fd8\u80fd\u7528\u5417\uff1f<\/h4>\n\n\n\n
\u53ef\u4ee5\u7528\uff0csession \u53ea\u662f\u4f9d\u8d56 cookie \u5b58\u50a8 sessionid\uff0c\u5982\u679c cookie \u88ab\u7981\u7528\u4e86\uff0c\u53ef\u4ee5\u4f7f\u7528 url \u4e2d\u6dfb\u52a0 sessionid \u7684\u65b9\u5f0f\u4fdd\u8bc1 session \u80fd\u6b63\u5e38\u4f7f\u7528\u3002<\/p>\n\n\n\n
70. spring mvc \u548c struts \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
- \u62e6\u622a\u7ea7\u522b\uff1astruts2 \u662f\u7c7b\u7ea7\u522b\u7684\u62e6\u622a\uff1bspring mvc \u662f\u65b9\u6cd5\u7ea7\u522b\u7684\u62e6\u622a\u3002<\/li>
- \u6570\u636e\u72ec\u7acb\u6027\uff1aspring mvc \u7684\u65b9\u6cd5\u4e4b\u95f4\u57fa\u672c\u4e0a\u72ec\u7acb\u7684\uff0c\u72ec\u4eab request \u548c response \u6570\u636e\uff0c\u8bf7\u6c42\u6570\u636e\u901a\u8fc7\u53c2\u6570\u83b7\u53d6\uff0c\u5904\u7406\u7ed3\u679c\u901a\u8fc7 ModelMap \u4ea4\u56de\u7ed9\u6846\u67b6\uff0c\u65b9\u6cd5\u4e4b\u95f4\u4e0d\u5171\u4eab\u53d8\u91cf\uff1b\u800c struts2 \u867d\u7136\u65b9\u6cd5\u4e4b\u95f4\u4e5f\u662f\u72ec\u7acb\u7684\uff0c\u4f46\u5176\u6240\u6709 action \u53d8\u91cf\u662f\u5171\u4eab\u7684\uff0c\u8fd9\u4e0d\u4f1a\u5f71\u54cd\u7a0b\u5e8f\u8fd0\u884c\uff0c\u5374\u7ed9\u6211\u4eec\u7f16\u7801\u548c\u8bfb\u7a0b\u5e8f\u65f6\u5e26\u6765\u4e86\u4e00\u5b9a\u7684\u9ebb\u70e6\u3002<\/li>
- \u62e6\u622a\u673a\u5236\uff1astruts2 \u6709\u4ee5\u81ea\u5df1\u7684 interceptor \u673a\u5236\uff0cspring mvc \u7528\u7684\u662f\u72ec\u7acb\u7684 aop \u65b9\u5f0f\uff0c\u8fd9\u6837\u5bfc\u81f4struts2 \u7684\u914d\u7f6e\u6587\u4ef6\u91cf\u6bd4 spring mvc \u5927\u3002<\/li>
- \u5bf9 ajax \u7684\u652f\u6301\uff1aspring mvc \u96c6\u6210\u4e86ajax\uff0c\u6240\u6709 ajax \u4f7f\u7528\u5f88\u65b9\u4fbf\uff0c\u53ea\u9700\u8981\u4e00\u4e2a\u6ce8\u89e3 @ResponseBody \u5c31\u53ef\u4ee5\u5b9e\u73b0\u4e86\uff1b\u800c struts2 \u4e00\u822c\u9700\u8981\u5b89\u88c5\u63d2\u4ef6\u6216\u8005\u81ea\u5df1\u5199\u4ee3\u7801\u624d\u884c\u3002<\/li><\/ul>\n\n\n\n
71. \u5982\u4f55\u907f\u514d SQL \u6ce8\u5165\uff1f<\/h4>\n\n\n\n
- \u4f7f\u7528\u9884\u5904\u7406 PreparedStatement\u3002<\/li>
- \u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u8fc7\u6ee4\u6389\u5b57\u7b26\u4e2d\u7684\u7279\u6b8a\u5b57\u7b26\u3002<\/li><\/ul>\n\n\n\n
72. \u4ec0\u4e48\u662f XSS \u653b\u51fb\uff0c\u5982\u4f55\u907f\u514d\uff1f<\/h4>\n\n\n\n
XSS \u653b\u51fb\uff1a\u5373\u8de8\u7ad9\u811a\u672c\u653b\u51fb\uff0c\u5b83\u662f Web \u7a0b\u5e8f\u4e2d\u5e38\u89c1\u7684\u6f0f\u6d1e\u3002\u539f\u7406\u662f\u653b\u51fb\u8005\u5f80 Web \u9875\u9762\u91cc\u63d2\u5165\u6076\u610f\u7684\u811a\u672c\u4ee3\u7801\uff08css \u4ee3\u7801\u3001Javascript \u4ee3\u7801\u7b49\uff09\uff0c\u5f53\u7528\u6237\u6d4f\u89c8\u8be5\u9875\u9762\u65f6\uff0c\u5d4c\u5165\u5176\u4e2d\u7684\u811a\u672c\u4ee3\u7801\u4f1a\u88ab\u6267\u884c\uff0c\u4ece\u800c\u8fbe\u5230\u6076\u610f\u653b\u51fb\u7528\u6237\u7684\u76ee\u7684\uff0c\u5982\u76d7\u53d6\u7528\u6237 cookie\u3001\u7834\u574f\u9875\u9762\u7ed3\u6784\u3001\u91cd\u5b9a\u5411\u5230\u5176\u4ed6\u7f51\u7ad9\u7b49\u3002<\/p>\n\n\n\n
\u9884\u9632 XSS \u7684\u6838\u5fc3\u662f\u5fc5\u987b\u5bf9\u8f93\u5165\u7684\u6570\u636e\u505a\u8fc7\u6ee4\u5904\u7406\u3002<\/p>\n\n\n\n
73. \u4ec0\u4e48\u662f CSRF \u653b\u51fb\uff0c\u5982\u4f55\u907f\u514d\uff1f<\/h4>\n\n\n\n
CSRF\uff1aCross-Site Request Forgery\uff08\u4e2d\u6587\uff1a\u8de8\u7ad9\u8bf7\u6c42\u4f2a\u9020\uff09\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\u653b\u51fb\u8005\u76d7\u7528\u4e86\u4f60\u7684\u8eab\u4efd\uff0c\u4ee5\u4f60\u7684\u540d\u4e49\u53d1\u9001\u6076\u610f\u8bf7\u6c42\uff0c\u6bd4\u5982\uff1a\u4ee5\u4f60\u540d\u4e49\u53d1\u9001\u90ae\u4ef6\u3001\u53d1\u6d88\u606f\u3001\u8d2d\u4e70\u5546\u54c1\uff0c\u865a\u62df\u8d27\u5e01\u8f6c\u8d26\u7b49\u3002<\/p>\n\n\n\n
\u9632\u5fa1\u624b\u6bb5\uff1a<\/p>\n\n\n\n
- \u9a8c\u8bc1\u8bf7\u6c42\u6765\u6e90\u5730\u5740\uff1b<\/li>
- \u5173\u952e\u64cd\u4f5c\u6dfb\u52a0\u9a8c\u8bc1\u7801\uff1b<\/li>
- \u5728\u8bf7\u6c42\u5730\u5740\u6dfb\u52a0 token \u5e76\u9a8c\u8bc1\u3002<\/li><\/ul>\n\n\n\n
\u5f02\u5e38<\/h3>\n\n\n\n
74. throw \u548c throws \u7684\u533a\u522b\uff1f<\/h4>\n\n\n\n
- throw\uff1a\u662f\u771f\u5b9e\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38\u3002<\/li>
- throws\uff1a\u662f\u58f0\u660e\u53ef\u80fd\u4f1a\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38\u3002<\/li><\/ul>\n\n\n\n
75. final\u3001finally\u3001finalize \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- final\uff1a\u662f\u4fee\u9970\u7b26\uff0c\u5982\u679c\u4fee\u9970\u7c7b\uff0c\u6b64\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\uff1b\u5982\u679c\u4fee\u9970\u65b9\u6cd5\u548c\u53d8\u91cf\uff0c\u5219\u8868\u793a\u6b64\u65b9\u6cd5\u548c\u6b64\u53d8\u91cf\u4e0d\u80fd\u5728\u88ab\u6539\u53d8\uff0c\u53ea\u80fd\u4f7f\u7528\u3002<\/li>
- finally\uff1a\u662f try{} catch{} finally{} \u6700\u540e\u4e00\u90e8\u5206\uff0c\u8868\u793a\u4e0d\u8bba\u53d1\u751f\u4efb\u4f55\u60c5\u51b5\u90fd\u4f1a\u6267\u884c\uff0cfinally \u90e8\u5206\u53ef\u4ee5\u7701\u7565\uff0c\u4f46\u5982\u679c finally \u90e8\u5206\u5b58\u5728\uff0c\u5219\u4e00\u5b9a\u4f1a\u6267\u884c finally \u91cc\u9762\u7684\u4ee3\u7801\u3002<\/li>
- finalize\uff1a \u662f Object \u7c7b\u7684\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5728\u5783\u573e\u6536\u96c6\u5668\u6267\u884c\u7684\u65f6\u5019\u4f1a\u8c03\u7528\u88ab\u56de\u6536\u5bf9\u8c61\u7684\u6b64\u65b9\u6cd5\u3002<\/li><\/ul>\n\n\n\n
76. try-catch-finally \u4e2d\u54ea\u4e2a\u90e8\u5206\u53ef\u4ee5\u7701\u7565\uff1f<\/h4>\n\n\n\n
try-catch-finally \u5176\u4e2d catch \u548c finally \u90fd\u53ef\u4ee5\u88ab\u7701\u7565\uff0c\u4f46\u662f\u4e0d\u80fd\u540c\u65f6\u7701\u7565\uff0c\u4e5f\u5c31\u662f\u8bf4\u6709 try \u7684\u65f6\u5019\uff0c\u5fc5\u987b\u540e\u9762\u8ddf\u4e00\u4e2a catch \u6216\u8005 finally\u3002<\/p>\n\n\n\n
77. try-catch-finally \u4e2d\uff0c\u5982\u679c catch \u4e2d return \u4e86\uff0cfinally \u8fd8\u4f1a\u6267\u884c\u5417\uff1f<\/h4>\n\n\n\n
finally \u4e00\u5b9a\u4f1a\u6267\u884c\uff0c\u5373\u4f7f\u662f catch \u4e2d return \u4e86\uff0ccatch \u4e2d\u7684 return \u4f1a\u7b49 finally \u4e2d\u7684\u4ee3\u7801\u6267\u884c\u5b8c\u4e4b\u540e\uff0c\u624d\u4f1a\u6267\u884c\u3002<\/p>\n\n\n\n
78. \u5e38\u89c1\u7684\u5f02\u5e38\u7c7b\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n
- NullPointerException \u7a7a\u6307\u9488\u5f02\u5e38<\/li>
- ClassNotFoundException \u6307\u5b9a\u7c7b\u4e0d\u5b58\u5728<\/li>
- NumberFormatException \u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u5b57\u5f02\u5e38<\/li>
- IndexOutOfBoundsException \u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u5f02\u5e38<\/li>
- ClassCastException \u6570\u636e\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38<\/li>
- FileNotFoundException \u6587\u4ef6\u672a\u627e\u5230\u5f02\u5e38<\/li>
- NoSuchMethodException \u65b9\u6cd5\u4e0d\u5b58\u5728\u5f02\u5e38<\/li>
- IOException IO \u5f02\u5e38<\/li>
- SocketException Socket \u5f02\u5e38<\/li><\/ul>\n\n\n\n
\u7f51\u7edc<\/h3>\n\n\n\n
79. http \u54cd\u5e94\u7801 301 \u548c 302 \u4ee3\u8868\u7684\u662f\u4ec0\u4e48\uff1f\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
301\uff1a\u6c38\u4e45\u91cd\u5b9a\u5411\u3002<\/p>\n\n\n\n
302\uff1a\u6682\u65f6\u91cd\u5b9a\u5411\u3002<\/p>\n\n\n\n
\u5b83\u4eec\u7684\u533a\u522b\u662f\uff0c301 \u5bf9\u641c\u7d22\u5f15\u64ce\u4f18\u5316\uff08SEO\uff09\u66f4\u52a0\u6709\u5229\uff1b302 \u6709\u88ab\u63d0\u793a\u4e3a\u7f51\u7edc\u62e6\u622a\u7684\u98ce\u9669\u3002<\/p>\n\n\n\n
80. forward \u548c redirect \u7684\u533a\u522b\uff1f<\/h4>\n\n\n\n
forward \u662f\u8f6c\u53d1 \u548c redirect \u662f\u91cd\u5b9a\u5411\uff1a<\/p>\n\n\n\n
- \u5730\u5740\u680f url \u663e\u793a\uff1afoward url \u4e0d\u4f1a\u53d1\u751f\u6539\u53d8\uff0credirect url \u4f1a\u53d1\u751f\u6539\u53d8\uff1b<\/li>
- \u6570\u636e\u5171\u4eab\uff1aforward \u53ef\u4ee5\u5171\u4eab request \u91cc\u7684\u6570\u636e\uff0credirect \u4e0d\u80fd\u5171\u4eab\uff1b<\/li>
- \u6548\u7387\uff1aforward \u6bd4 redirect \u6548\u7387\u9ad8\u3002<\/li><\/ul>\n\n\n\n
81. \u7b80\u8ff0 tcp \u548c udp\u7684\u533a\u522b\uff1f<\/h4>\n\n\n\n
tcp \u548c udp \u662f OSI \u6a21\u578b\u4e2d\u7684\u8fd0\u8f93\u5c42\u4e2d\u7684\u534f\u8bae\u3002tcp \u63d0\u4f9b\u53ef\u9760\u7684\u901a\u4fe1\u4f20\u8f93\uff0c\u800c udp \u5219\u5e38\u88ab\u7528\u4e8e\u8ba9\u5e7f\u64ad\u548c\u7ec6\u8282\u63a7\u5236\u4ea4\u7ed9\u5e94\u7528\u7684\u901a\u4fe1\u4f20\u8f93\u3002<\/p>\n\n\n\n
\u4e24\u8005\u7684\u533a\u522b\u5927\u81f4\u5982\u4e0b\uff1a<\/p>\n\n\n\n
- tcp \u9762\u5411\u8fde\u63a5\uff0cudp \u9762\u5411\u975e\u8fde\u63a5\u5373\u53d1\u9001\u6570\u636e\u524d\u4e0d\u9700\u8981\u5efa\u7acb\u94fe\u63a5\uff1b<\/li>
- tcp \u63d0\u4f9b\u53ef\u9760\u7684\u670d\u52a1\uff08\u6570\u636e\u4f20\u8f93\uff09\uff0cudp \u65e0\u6cd5\u4fdd\u8bc1\uff1b<\/li>
- tcp \u9762\u5411\u5b57\u8282\u6d41\uff0cudp \u9762\u5411\u62a5\u6587\uff1b<\/li>
- tcp \u6570\u636e\u4f20\u8f93\u6162\uff0cudp \u6570\u636e\u4f20\u8f93\u5feb\uff1b<\/li><\/ul>\n\n\n\n
82. tcp \u4e3a\u4ec0\u4e48\u8981\u4e09\u6b21\u63e1\u624b\uff0c\u4e24\u6b21\u4e0d\u884c\u5417\uff1f\u4e3a\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
\u5982\u679c\u91c7\u7528\u4e24\u6b21\u63e1\u624b\uff0c\u90a3\u4e48\u53ea\u8981\u670d\u52a1\u5668\u53d1\u51fa\u786e\u8ba4\u6570\u636e\u5305\u5c31\u4f1a\u5efa\u7acb\u8fde\u63a5\uff0c\u4f46\u7531\u4e8e\u5ba2\u6237\u7aef\u6b64\u65f6\u5e76\u672a\u54cd\u5e94\u670d\u52a1\u5668\u7aef\u7684\u8bf7\u6c42\uff0c\u90a3\u6b64\u65f6\u670d\u52a1\u5668\u7aef\u5c31\u4f1a\u4e00\u76f4\u5728\u7b49\u5f85\u5ba2\u6237\u7aef\uff0c\u8fd9\u6837\u670d\u52a1\u5668\u7aef\u5c31\u767d\u767d\u6d6a\u8d39\u4e86\u4e00\u5b9a\u7684\u8d44\u6e90\u3002\u82e5\u91c7\u7528\u4e09\u6b21\u63e1\u624b\uff0c\u670d\u52a1\u5668\u7aef\u6ca1\u6709\u6536\u5230\u6765\u81ea\u5ba2\u6237\u7aef\u7684\u518d\u6b64\u786e\u8ba4\uff0c\u5219\u5c31\u4f1a\u77e5\u9053\u5ba2\u6237\u7aef\u5e76\u6ca1\u6709\u8981\u6c42\u5efa\u7acb\u8bf7\u6c42\uff0c\u5c31\u4e0d\u4f1a\u6d6a\u8d39\u670d\u52a1\u5668\u7684\u8d44\u6e90\u3002<\/p>\n\n\n\n
83. \u8bf4\u4e00\u4e0b tcp \u7c98\u5305\u662f\u600e\u4e48\u4ea7\u751f\u7684\uff1f<\/h4>\n\n\n\n
tcp \u7c98\u5305\u53ef\u80fd\u53d1\u751f\u5728\u53d1\u9001\u7aef\u6216\u8005\u63a5\u6536\u7aef\uff0c\u5206\u522b\u6765\u770b\u4e24\u7aef\u5404\u79cd\u4ea7\u751f\u7c98\u5305\u7684\u539f\u56e0\uff1a<\/p>\n\n\n\n
- \u53d1\u9001\u7aef\u7c98\u5305\uff1a\u53d1\u9001\u7aef\u9700\u8981\u7b49\u7f13\u51b2\u533a\u6ee1\u624d\u53d1\u9001\u51fa\u53bb\uff0c\u9020\u6210\u7c98\u5305\uff1b<\/li>
- \u63a5\u6536\u65b9\u7c98\u5305\uff1a\u63a5\u6536\u65b9\u4e0d\u53ca\u65f6\u63a5\u6536\u7f13\u51b2\u533a\u7684\u5305\uff0c\u9020\u6210\u591a\u4e2a\u5305\u63a5\u6536\u3002<\/li><\/ul>\n\n\n\n
84. OSI \u7684\u4e03\u5c42\u6a21\u578b\u90fd\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n
- \u7269\u7406\u5c42\uff1a\u5229\u7528\u4f20\u8f93\u4ecb\u8d28\u4e3a\u6570\u636e\u94fe\u8def\u5c42\u63d0\u4f9b\u7269\u7406\u8fde\u63a5\uff0c\u5b9e\u73b0\u6bd4\u7279\u6d41\u7684\u900f\u660e\u4f20\u8f93\u3002<\/li>
- \u6570\u636e\u94fe\u8def\u5c42\uff1a\u8d1f\u8d23\u5efa\u7acb\u548c\u7ba1\u7406\u8282\u70b9\u95f4\u7684\u94fe\u8def\u3002<\/li>
- \u7f51\u7edc\u5c42\uff1a\u901a\u8fc7\u8def\u7531\u9009\u62e9\u7b97\u6cd5\uff0c\u4e3a\u62a5\u6587\u6216\u5206\u7ec4\u901a\u8fc7\u901a\u4fe1\u5b50\u7f51\u9009\u62e9\u6700\u9002\u5f53\u7684\u8def\u5f84\u3002<\/li>
- \u4f20\u8f93\u5c42\uff1a\u5411\u7528\u6237\u63d0\u4f9b\u53ef\u9760\u7684\u7aef\u5230\u7aef\u7684\u5dee\u9519\u548c\u6d41\u91cf\u63a7\u5236\uff0c\u4fdd\u8bc1\u62a5\u6587\u7684\u6b63\u786e\u4f20\u8f93\u3002<\/li>
- \u4f1a\u8bdd\u5c42\uff1a\u5411\u4e24\u4e2a\u5b9e\u4f53\u7684\u8868\u793a\u5c42\u63d0\u4f9b\u5efa\u7acb\u548c\u4f7f\u7528\u8fde\u63a5\u7684\u65b9\u6cd5\u3002<\/li>
- \u8868\u793a\u5c42\uff1a\u5904\u7406\u7528\u6237\u4fe1\u606f\u7684\u8868\u793a\u95ee\u9898\uff0c\u5982\u7f16\u7801\u3001\u6570\u636e\u683c\u5f0f\u8f6c\u6362\u548c\u52a0\u5bc6\u89e3\u5bc6\u7b49\u3002<\/li>
- \u5e94\u7528\u5c42\uff1a\u76f4\u63a5\u5411\u7528\u6237\u63d0\u4f9b\u670d\u52a1\uff0c\u5b8c\u6210\u7528\u6237\u5e0c\u671b\u5728\u7f51\u7edc\u4e0a\u5b8c\u6210\u7684\u5404\u79cd\u5de5\u4f5c\u3002<\/li><\/ul>\n\n\n\n
85. get \u548c post \u8bf7\u6c42\u6709\u54ea\u4e9b\u533a\u522b\uff1f<\/h4>\n\n\n\n
- get \u8bf7\u6c42\u4f1a\u88ab\u6d4f\u89c8\u5668\u4e3b\u52a8\u7f13\u5b58\uff0c\u800c post \u4e0d\u4f1a\u3002<\/li>
- get \u4f20\u9012\u53c2\u6570\u6709\u5927\u5c0f\u9650\u5236\uff0c\u800c post \u6ca1\u6709\u3002<\/li>
- post \u53c2\u6570\u4f20\u8f93\u66f4\u5b89\u5168\uff0cget \u7684\u53c2\u6570\u4f1a\u660e\u6587\u9650\u5236\u5728 url \u4e0a\uff0cpost \u4e0d\u4f1a\u3002<\/li><\/ul>\n\n\n\n
86. \u5982\u4f55\u5b9e\u73b0\u8de8\u57df\uff1f<\/h4>\n\n\n\n
\u5b9e\u73b0\u8de8\u57df\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6848\uff1a<\/p>\n\n\n\n
- \u670d\u52a1\u5668\u7aef\u8fd0\u884c\u8de8\u57df \u8bbe\u7f6e CORS \u7b49\u4e8e *\uff1b<\/li>
- \u5728\u5355\u4e2a\u63a5\u53e3\u4f7f\u7528\u6ce8\u89e3 @CrossOrigin \u8fd0\u884c\u8de8\u57df\uff1b<\/li>
- \u4f7f\u7528 jsonp \u8de8\u57df\uff1b<\/li><\/ul>\n\n\n\n
87. \u8bf4\u4e00\u4e0b JSONP \u5b9e\u73b0\u539f\u7406\uff1f<\/h4>\n\n\n\n
jsonp\uff1aJSON with Padding\uff0c\u5b83\u662f\u5229\u7528script\u6807\u7b7e\u7684 src \u8fde\u63a5\u53ef\u4ee5\u8bbf\u95ee\u4e0d\u540c\u6e90\u7684\u7279\u6027\uff0c\u52a0\u8f7d\u8fdc\u7a0b\u8fd4\u56de\u7684\u201cJS \u51fd\u6570\u201d\u6765\u6267\u884c\u7684\u3002<\/p>\n\n\n\n
\u8bbe\u8ba1\u6a21\u5f0f<\/h3>\n\n\n\n
88. \u8bf4\u4e00\u4e0b\u4f60\u719f\u6089\u7684\u8bbe\u8ba1\u6a21\u5f0f\uff1f<\/h4>\n\n\n\n
- \u5355\u4f8b\u6a21\u5f0f\uff1a\u4fdd\u8bc1\u88ab\u521b\u5efa\u4e00\u6b21\uff0c\u8282\u7701\u7cfb\u7edf\u5f00\u9500\u3002<\/li>
- \u5de5\u5382\u6a21\u5f0f\uff08\u7b80\u5355\u5de5\u5382\u3001\u62bd\u8c61\u5de5\u5382\uff09\uff1a\u89e3\u8026\u4ee3\u7801\u3002<\/li>
- \u89c2\u5bdf\u8005\u6a21\u5f0f\uff1a\u5b9a\u4e49\u4e86\u5bf9\u8c61\u4e4b\u95f4\u7684\u4e00\u5bf9\u591a\u7684\u4f9d\u8d56\uff0c\u8fd9\u6837\u4e00\u6765\uff0c\u5f53\u4e00\u4e2a\u5bf9\u8c61\u6539\u53d8\u65f6\uff0c\u5b83\u7684\u6240\u6709\u7684\u4f9d\u8d56\u8005\u90fd\u4f1a\u6536\u5230\u901a\u77e5\u5e76\u81ea\u52a8\u66f4\u65b0\u3002<\/li>
- \u5916\u89c2\u6a21\u5f0f\uff1a\u63d0\u4f9b\u4e00\u4e2a\u7edf\u4e00\u7684\u63a5\u53e3\uff0c\u7528\u6765\u8bbf\u95ee\u5b50\u7cfb\u7edf\u4e2d\u7684\u4e00\u7fa4\u63a5\u53e3\uff0c\u5916\u89c2\u5b9a\u4e49\u4e86\u4e00\u4e2a\u9ad8\u5c42\u7684\u63a5\u53e3\uff0c\u8ba9\u5b50\u7cfb\u7edf\u66f4\u5bb9\u6613\u4f7f\u7528\u3002<\/li>
- \u6a21\u7248\u65b9\u6cd5\u6a21\u5f0f\uff1a\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7b97\u6cd5\u7684\u9aa8\u67b6\uff0c\u800c\u5c06\u4e00\u4e9b\u6b65\u9aa4\u5ef6\u8fdf\u5230\u5b50\u7c7b\u4e2d\uff0c\u6a21\u7248\u65b9\u6cd5\u4f7f\u5f97\u5b50\u7c7b\u53ef\u4ee5\u5728\u4e0d\u6539\u53d8\u7b97\u6cd5\u7ed3\u6784\u7684\u60c5\u51b5\u4e0b\uff0c\u91cd\u65b0\u5b9a\u4e49\u7b97\u6cd5\u7684\u6b65\u9aa4\u3002<\/li>
- \u72b6\u6001\u6a21\u5f0f\uff1a\u5141\u8bb8\u5bf9\u8c61\u5728\u5185\u90e8\u72b6\u6001\u6539\u53d8\u65f6\u6539\u53d8\u5b83\u7684\u884c\u4e3a\uff0c\u5bf9\u8c61\u770b\u8d77\u6765\u597d\u50cf\u4fee\u6539\u4e86\u5b83\u7684\u7c7b\u3002<\/li><\/ul>\n\n\n\n
89. \u7b80\u5355\u5de5\u5382\u548c\u62bd\u8c61\u5de5\u5382\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
- \u7b80\u5355\u5de5\u5382\uff1a\u7528\u6765\u751f\u4ea7\u540c\u4e00\u7b49\u7ea7\u7ed3\u6784\u4e2d\u7684\u4efb\u610f\u4ea7\u54c1\uff0c\u5bf9\u4e8e\u589e\u52a0\u65b0\u7684\u4ea7\u54c1\uff0c\u65e0\u80fd\u4e3a\u529b\u3002<\/li>
- \u5de5\u5382\u65b9\u6cd5\uff1a\u7528\u6765\u751f\u4ea7\u540c\u4e00\u7b49\u7ea7\u7ed3\u6784\u4e2d\u7684\u56fa\u5b9a\u4ea7\u54c1\uff0c\u652f\u6301\u589e\u52a0\u4efb\u610f\u4ea7\u54c1\u3002<\/li>
- \u62bd\u8c61\u5de5\u5382\uff1a\u7528\u6765\u751f\u4ea7\u4e0d\u540c\u4ea7\u54c1\u65cf\u7684\u5168\u90e8\u4ea7\u54c1\uff0c\u5bf9\u4e8e\u589e\u52a0\u65b0\u7684\u4ea7\u54c1\uff0c\u65e0\u80fd\u4e3a\u529b\uff1b\u652f\u6301\u589e\u52a0\u4ea7\u54c1\u65cf\u3002<\/li><\/ul>\n\n\n\n
Spring\/Spring MVC<\/h3>\n\n\n\n
90. \u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528 spring\uff1f<\/h4>\n\n\n\n
- spring \u63d0\u4f9b ioc \u6280\u672f\uff0c\u5bb9\u5668\u4f1a\u5e2e\u4f60\u7ba1\u7406\u4f9d\u8d56\u7684\u5bf9\u8c61\uff0c\u4ece\u800c\u4e0d\u9700\u8981\u81ea\u5df1\u521b\u5efa\u548c\u7ba1\u7406\u4f9d\u8d56\u5bf9\u8c61\u4e86\uff0c\u66f4\u8f7b\u677e\u7684\u5b9e\u73b0\u4e86\u7a0b\u5e8f\u7684\u89e3\u8026\u3002<\/li>
- spring \u63d0\u4f9b\u4e86\u4e8b\u52a1\u652f\u6301\uff0c\u4f7f\u5f97\u4e8b\u52a1\u64cd\u4f5c\u53d8\u7684\u66f4\u52a0\u65b9\u4fbf\u3002<\/li>
- spring \u63d0\u4f9b\u4e86\u9762\u5411\u5207\u7247\u7f16\u7a0b\uff0c\u8fd9\u6837\u53ef\u4ee5\u66f4\u65b9\u4fbf\u7684\u5904\u7406\u67d0\u4e00\u7c7b\u7684\u95ee\u9898\u3002<\/li>
- \u66f4\u65b9\u4fbf\u7684\u6846\u67b6\u96c6\u6210\uff0cspring \u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u96c6\u6210\u5176\u4ed6\u6846\u67b6\uff0c\u6bd4\u5982 MyBatis\u3001hibernate \u7b49\u3002<\/li><\/ul>\n\n\n\n
91. \u89e3\u91ca\u4e00\u4e0b\u4ec0\u4e48\u662f aop\uff1f<\/h4>\n\n\n\n
aop \u662f\u9762\u5411\u5207\u9762\u7f16\u7a0b\uff0c\u901a\u8fc7\u9884\u7f16\u8bd1\u65b9\u5f0f\u548c\u8fd0\u884c\u671f\u52a8\u6001\u4ee3\u7406\u5b9e\u73b0\u7a0b\u5e8f\u529f\u80fd\u7684\u7edf\u4e00\u7ef4\u62a4\u7684\u4e00\u79cd\u6280\u672f\u3002<\/p>\n\n\n\n
\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u7edf\u4e00\u5904\u7406\u67d0\u4e00\u201c\u5207\u9762\u201d\uff08\u7c7b\uff09\u7684\u95ee\u9898\u7684\u7f16\u7a0b\u601d\u60f3\uff0c\u6bd4\u5982\u7edf\u4e00\u5904\u7406\u65e5\u5fd7\u3001\u5f02\u5e38\u7b49\u3002<\/p>\n\n\n\n
92. \u89e3\u91ca\u4e00\u4e0b\u4ec0\u4e48\u662f ioc\uff1f<\/h4>\n\n\n\n
ioc\uff1aInversionof Control\uff08\u4e2d\u6587\uff1a\u63a7\u5236\u53cd\u8f6c\uff09\u662f spring \u7684\u6838\u5fc3\uff0c\u5bf9\u4e8e spring \u6846\u67b6\u6765\u8bf4\uff0c\u5c31\u662f\u7531 spring \u6765\u8d1f\u8d23\u63a7\u5236\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u548c\u5bf9\u8c61\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n\n\n\n
\u7b80\u5355\u6765\u8bf4\uff0c\u63a7\u5236\u6307\u7684\u662f\u5f53\u524d\u5bf9\u8c61\u5bf9\u5185\u90e8\u6210\u5458\u7684\u63a7\u5236\u6743\uff1b\u63a7\u5236\u53cd\u8f6c\u6307\u7684\u662f\uff0c\u8fd9\u79cd\u63a7\u5236\u6743\u4e0d\u7531\u5f53\u524d\u5bf9\u8c61\u7ba1\u7406\u4e86\uff0c\u7531\u5176\u4ed6\uff08\u7c7b,\u7b2c\u4e09\u65b9\u5bb9\u5668\uff09\u6765\u7ba1\u7406\u3002<\/p>\n\n\n\n
93. spring \u6709\u54ea\u4e9b\u4e3b\u8981\u6a21\u5757\uff1f<\/h4>\n\n\n\n
- spring core\uff1a\u6846\u67b6\u7684\u6700\u57fa\u7840\u90e8\u5206\uff0c\u63d0\u4f9b ioc \u548c\u4f9d\u8d56\u6ce8\u5165\u7279\u6027\u3002<\/li>
- spring context\uff1a\u6784\u5efa\u4e8e core \u5c01\u88c5\u5305\u57fa\u7840\u4e0a\u7684 context \u5c01\u88c5\u5305\uff0c\u63d0\u4f9b\u4e86\u4e00\u79cd\u6846\u67b6\u5f0f\u7684\u5bf9\u8c61\u8bbf\u95ee\u65b9\u6cd5\u3002<\/li>
- spring dao\uff1aData Access Object \u63d0\u4f9b\u4e86JDBC\u7684\u62bd\u8c61\u5c42\u3002<\/li>
- spring aop\uff1a\u63d0\u4f9b\u4e86\u9762\u5411\u5207\u9762\u7684\u7f16\u7a0b\u5b9e\u73b0\uff0c\u8ba9\u4f60\u53ef\u4ee5\u81ea\u5b9a\u4e49\u62e6\u622a\u5668\u3001\u5207\u70b9\u7b49\u3002<\/li>
- spring Web\uff1a\u63d0\u4f9b\u4e86\u9488\u5bf9 Web \u5f00\u53d1\u7684\u96c6\u6210\u7279\u6027\uff0c\u4f8b\u5982\u6587\u4ef6\u4e0a\u4f20\uff0c\u5229\u7528 servlet listeners \u8fdb\u884c ioc \u5bb9\u5668\u521d\u59cb\u5316\u548c\u9488\u5bf9 Web \u7684 ApplicationContext\u3002<\/li>
- spring Web mvc\uff1aspring \u4e2d\u7684 mvc \u5c01\u88c5\u5305\u63d0\u4f9b\u4e86 Web \u5e94\u7528\u7684 Model-View-Controller\uff08MVC\uff09\u7684\u5b9e\u73b0\u3002<\/li><\/ul>\n\n\n\n
94. spring \u5e38\u7528\u7684\u6ce8\u5165\u65b9\u5f0f\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n
- setter \u5c5e\u6027\u6ce8\u5165<\/li>
- \u6784\u9020\u65b9\u6cd5\u6ce8\u5165<\/li>
- \u6ce8\u89e3\u65b9\u5f0f\u6ce8\u5165<\/li><\/ul>\n\n\n\n
95. spring \u4e2d\u7684 bean \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u5417\uff1f<\/h4>\n\n\n\n
spring \u4e2d\u7684 bean \u9ed8\u8ba4\u662f\u5355\u4f8b\u6a21\u5f0f\uff0cspring \u6846\u67b6\u5e76\u6ca1\u6709\u5bf9\u5355\u4f8b bean \u8fdb\u884c\u591a\u7ebf\u7a0b\u7684\u5c01\u88c5\u5904\u7406\u3002<\/p>\n\n\n\n
\u5b9e\u9645\u4e0a\u5927\u90e8\u5206\u65f6\u5019 spring bean \u65e0\u72b6\u6001\u7684\uff08\u6bd4\u5982 dao \u7c7b\uff09\uff0c\u6240\u6709\u67d0\u79cd\u7a0b\u5ea6\u4e0a\u6765\u8bf4 bean \u4e5f\u662f\u5b89\u5168\u7684\uff0c\u4f46\u5982\u679c bean \u6709\u72b6\u6001\u7684\u8bdd\uff08\u6bd4\u5982 view model \u5bf9\u8c61\uff09\uff0c\u90a3\u5c31\u8981\u5f00\u53d1\u8005\u81ea\u5df1\u53bb\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u4e86\uff0c\u6700\u7b80\u5355\u7684\u5c31\u662f\u6539\u53d8 bean \u7684\u4f5c\u7528\u57df\uff0c\u628a\u201csingleton\u201d\u53d8\u66f4\u4e3a\u201cprototype\u201d\uff0c\u8fd9\u6837\u8bf7\u6c42 bean \u76f8\u5f53\u4e8e new Bean()\u4e86\uff0c\u6240\u4ee5\u5c31\u53ef\u4ee5\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u4e86\u3002<\/p>\n\n\n\n
- \u6709\u72b6\u6001\u5c31\u662f\u6709\u6570\u636e\u5b58\u50a8\u529f\u80fd\u3002<\/li>
- \u65e0\u72b6\u6001\u5c31\u662f\u4e0d\u4f1a\u4fdd\u5b58\u6570\u636e\u3002<\/li><\/ul>\n\n\n\n
96. spring \u652f\u6301\u51e0\u79cd bean \u7684\u4f5c\u7528\u57df\uff1f<\/h4>\n\n\n\n
spring \u652f\u6301 5 \u79cd\u4f5c\u7528\u57df\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
- singleton\uff1aspring ioc \u5bb9\u5668\u4e2d\u53ea\u5b58\u5728\u4e00\u4e2a bean \u5b9e\u4f8b\uff0cbean \u4ee5\u5355\u4f8b\u6a21\u5f0f\u5b58\u5728\uff0c\u662f\u7cfb\u7edf\u9ed8\u8ba4\u503c\uff1b<\/li>
- prototype\uff1a\u6bcf\u6b21\u4ece\u5bb9\u5668\u8c03\u7528 bean \u65f6\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u793a\u4f8b\uff0c\u65e2\u6bcf\u6b21 getBean()\u76f8\u5f53\u4e8e\u6267\u884c new Bean()\u64cd\u4f5c\uff1b<\/li>
- Web \u73af\u5883\u4e0b\u7684\u4f5c\u7528\u57df\uff1a<\/li>
- request\uff1a\u6bcf\u6b21 http \u8bf7\u6c42\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a bean\uff1b<\/li>
- session\uff1a\u540c\u4e00\u4e2a http session \u5171\u4eab\u4e00\u4e2a bean \u5b9e\u4f8b\uff1b<\/li>
- global-session\uff1a\u7528\u4e8e portlet \u5bb9\u5668\uff0c\u56e0\u4e3a\u6bcf\u4e2a portlet \u6709\u5355\u72ec\u7684 session\uff0cglobalsession \u63d0\u4f9b\u4e00\u4e2a\u5168\u5c40\u6027\u7684 http session\u3002<\/li><\/ul>\n\n\n\n
\u300c\u6ce8\u610f\uff1a\u300d<\/strong> \u4f7f\u7528 prototype \u4f5c\u7528\u57df\u9700\u8981\u614e\u91cd\u7684\u601d\u8003\uff0c\u56e0\u4e3a\u9891\u7e41\u521b\u5efa\u548c\u9500\u6bc1 bean \u4f1a\u5e26\u6765\u5f88\u5927\u7684\u6027\u80fd\u5f00\u9500\u3002<\/p>\n\n\n\n
97. spring \u81ea\u52a8\u88c5\u914d bean \u6709\u54ea\u4e9b\u65b9\u5f0f\uff1f<\/h4>\n\n\n\n
- no\uff1a\u9ed8\u8ba4\u503c\uff0c\u8868\u793a\u6ca1\u6709\u81ea\u52a8\u88c5\u914d\uff0c\u5e94\u4f7f\u7528\u663e\u5f0f bean \u5f15\u7528\u8fdb\u884c\u88c5\u914d\u3002<\/li>
- byName\uff1a\u5b83\u6839\u636e bean \u7684\u540d\u79f0\u6ce8\u5165\u5bf9\u8c61\u4f9d\u8d56\u9879\u3002<\/li>
- byType\uff1a\u5b83\u6839\u636e\u7c7b\u578b\u6ce8\u5165\u5bf9\u8c61\u4f9d\u8d56\u9879\u3002<\/li>
- \u6784\u9020\u51fd\u6570\uff1a\u901a\u8fc7\u6784\u9020\u51fd\u6570\u6765\u6ce8\u5165\u4f9d\u8d56\u9879\uff0c\u9700\u8981\u8bbe\u7f6e\u5927\u91cf\u7684\u53c2\u6570\u3002<\/li>
- autodetect\uff1a\u5bb9\u5668\u9996\u5148\u901a\u8fc7\u6784\u9020\u51fd\u6570\u4f7f\u7528 autowire \u88c5\u914d\uff0c\u5982\u679c\u4e0d\u80fd\uff0c\u5219\u901a\u8fc7 byType \u81ea\u52a8\u88c5\u914d\u3002<\/li><\/ul>\n\n\n\n
98. spring \u4e8b\u52a1\u5b9e\u73b0\u65b9\u5f0f\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n
- \u58f0\u660e\u5f0f\u4e8b\u52a1\uff1a\u58f0\u660e\u5f0f\u4e8b\u52a1\u4e5f\u6709\u4e24\u79cd\u5b9e\u73b0\u65b9\u5f0f\uff0c\u57fa\u4e8e xml \u914d\u7f6e\u6587\u4ef6\u7684\u65b9\u5f0f\u548c\u6ce8\u89e3\u65b9\u5f0f\uff08\u5728\u7c7b\u4e0a\u6dfb\u52a0 @Transaction \u6ce8\u89e3\uff09\u3002<\/li>
- \u7f16\u7801\u65b9\u5f0f\uff1a\u63d0\u4f9b\u7f16\u7801\u7684\u5f62\u5f0f\u7ba1\u7406\u548c\u7ef4\u62a4\u4e8b\u52a1\u3002<\/li><\/ul>\n\n\n\n
99. \u8bf4\u4e00\u4e0b spring \u7684\u4e8b\u52a1\u9694\u79bb\uff1f<\/h4>\n\n\n\n
spring \u6709\u4e94\u5927\u9694\u79bb\u7ea7\u522b\uff0c\u9ed8\u8ba4\u503c\u4e3a ISOLATION_DEFAULT\uff08\u4f7f\u7528\u6570\u636e\u5e93\u7684\u8bbe\u7f6e\uff09\uff0c\u5176\u4ed6\u56db\u4e2a\u9694\u79bb\u7ea7\u522b\u548c\u6570\u636e\u5e93\u7684\u9694\u79bb\u7ea7\u522b\u4e00\u81f4\uff1a<\/p>\n\n\n\n
ISOLATION_DEFAULT\uff1a\u7528\u5e95\u5c42\u6570\u636e\u5e93\u7684\u8bbe\u7f6e\u9694\u79bb\u7ea7\u522b\uff0c\u6570\u636e\u5e93\u8bbe\u7f6e\u7684\u662f\u4ec0\u4e48\u6211\u5c31\u7528\u4ec0\u4e48\uff1b<\/p>\n\n\n\n
ISOLATIONREAD<\/em>UNCOMMITTED\uff1a\u672a\u63d0\u4ea4\u8bfb\uff0c\u6700\u4f4e\u9694\u79bb\u7ea7\u522b\u3001\u4e8b\u52a1\u672a\u63d0\u4ea4\u524d\uff0c\u5c31\u53ef\u88ab\u5176\u4ed6\u4e8b\u52a1\u8bfb\u53d6\uff08\u4f1a\u51fa\u73b0\u5e7b\u8bfb\u3001\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\uff09\uff1b<\/p>\n\n\n\n
ISOLATIONREAD<\/em>COMMITTED\uff1a\u63d0\u4ea4\u8bfb\uff0c\u4e00\u4e2a\u4e8b\u52a1\u63d0\u4ea4\u540e\u624d\u80fd\u88ab\u5176\u4ed6\u4e8b\u52a1\u8bfb\u53d6\u5230\uff08\u4f1a\u9020\u6210\u5e7b\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\uff09\uff0cSQL server \u7684\u9ed8\u8ba4\u7ea7\u522b\uff1b<\/p>\n\n\n\n
ISOLATIONREPEATABLE<\/em>READ\uff1a\u53ef\u91cd\u590d\u8bfb\uff0c\u4fdd\u8bc1\u591a\u6b21\u8bfb\u53d6\u540c\u4e00\u4e2a\u6570\u636e\u65f6\uff0c\u5176\u503c\u90fd\u548c\u4e8b\u52a1\u5f00\u59cb\u65f6\u5019\u7684\u5185\u5bb9\u662f\u4e00\u81f4\uff0c\u7981\u6b62\u8bfb\u53d6\u5230\u522b\u7684\u4e8b\u52a1\u672a\u63d0\u4ea4\u7684\u6570\u636e\uff08\u4f1a\u9020\u6210\u5e7b\u8bfb\uff09\uff0cMySQL \u7684\u9ed8\u8ba4\u7ea7\u522b\uff1b<\/p>\n\n\n\n
ISOLATION_SERIALIZABLE\uff1a\u5e8f\u5217\u5316\uff0c\u4ee3\u4ef7\u6700\u9ad8\u6700\u53ef\u9760\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u8be5\u9694\u79bb\u7ea7\u522b\u80fd\u9632\u6b62\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\u3002<\/p>\n\n\n\n
\u300c\u810f\u8bfb\u300d<\/strong> \uff1a\u8868\u793a\u4e00\u4e2a\u4e8b\u52a1\u80fd\u591f\u8bfb\u53d6\u53e6\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u8fd8\u672a\u63d0\u4ea4\u7684\u6570\u636e\u3002\u6bd4\u5982\uff0c\u67d0\u4e2a\u4e8b\u52a1\u5c1d\u8bd5\u63d2\u5165\u8bb0\u5f55 A\uff0c\u6b64\u65f6\u8be5\u4e8b\u52a1\u8fd8\u672a\u63d0\u4ea4\uff0c\u7136\u540e\u53e6\u4e00\u4e2a\u4e8b\u52a1\u5c1d\u8bd5\u8bfb\u53d6\u5230\u4e86\u8bb0\u5f55 A\u3002<\/p>\n\n\n\n
\u300c\u4e0d\u53ef\u91cd\u590d\u8bfb\u300d<\/strong> \uff1a\u662f\u6307\u5728\u4e00\u4e2a\u4e8b\u52a1\u5185\uff0c\u591a\u6b21\u8bfb\u540c\u4e00\u6570\u636e\u3002<\/p>\n\n\n\n
\u300c\u5e7b\u8bfb\u300d<\/strong> \uff1a\u6307\u540c\u4e00\u4e2a\u4e8b\u52a1\u5185\u591a\u6b21\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u96c6\u4e0d\u4e00\u6837\u3002\u6bd4\u5982\u540c\u4e00\u4e2a\u4e8b\u52a1 A \u7b2c\u4e00\u6b21\u67e5\u8be2\u65f6\u5019\u6709 n \u6761\u8bb0\u5f55\uff0c\u4f46\u662f\u7b2c\u4e8c\u6b21\u540c\u7b49\u6761\u4ef6\u4e0b\u67e5\u8be2\u5374\u6709 n+1 \u6761\u8bb0\u5f55\uff0c\u8fd9\u5c31\u597d\u50cf\u4ea7\u751f\u4e86\u5e7b\u89c9\u3002\u53d1\u751f\u5e7b\u8bfb\u7684\u539f\u56e0\u4e5f\u662f\u53e6\u5916\u4e00\u4e2a\u4e8b\u52a1\u65b0\u589e\u6216\u8005\u5220\u9664\u6216\u8005\u4fee\u6539\u4e86\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u7ed3\u679c\u96c6\u91cc\u9762\u7684\u6570\u636e\uff0c\u540c\u4e00\u4e2a\u8bb0\u5f55\u7684\u6570\u636e\u5185\u5bb9\u88ab\u4fee\u6539\u4e86\uff0c\u6240\u6709\u6570\u636e\u884c\u7684\u8bb0\u5f55\u5c31\u53d8\u591a\u6216\u8005\u53d8\u5c11\u4e86\u3002<\/p>\n\n\n\n
100. \u8bf4\u4e00\u4e0b spring mvc \u8fd0\u884c\u6d41\u7a0b\uff1f<\/h4>\n\n\n\n
- spring mvc \u5148\u5c06\u8bf7\u6c42\u53d1\u9001\u7ed9 DispatcherServlet\u3002<\/li>
- DispatcherServlet \u67e5\u8be2\u4e00\u4e2a\u6216\u591a\u4e2a HandlerMapping\uff0c\u627e\u5230\u5904\u7406\u8bf7\u6c42\u7684 Controller\u3002<\/li>
- DispatcherServlet \u518d\u628a\u8bf7\u6c42\u63d0\u4ea4\u5230\u5bf9\u5e94\u7684 Controller\u3002<\/li>
- Controller \u8fdb\u884c\u4e1a\u52a1\u903b\u8f91\u5904\u7406\u540e\uff0c\u4f1a\u8fd4\u56de\u4e00\u4e2aModelAndView\u3002<\/li>
- Dispathcher \u67e5\u8be2\u4e00\u4e2a\u6216\u591a\u4e2a ViewResolver \u89c6\u56fe\u89e3\u6790\u5668\uff0c\u627e\u5230 ModelAndView \u5bf9\u8c61\u6307\u5b9a\u7684\u89c6\u56fe\u5bf9\u8c61\u3002<\/li>
- \u89c6\u56fe\u5bf9\u8c61\u8d1f\u8d23\u6e32\u67d3\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002<\/li><\/ul>\n\n\n\n
101. spring mvc \u6709\u54ea\u4e9b\u7ec4\u4ef6\uff1f<\/h4>\n\n\n\n
- \u524d\u7f6e\u63a7\u5236\u5668 DispatcherServlet\u3002<\/li>
- \u6620\u5c04\u63a7\u5236\u5668 HandlerMapping\u3002<\/li>
- \u5904\u7406\u5668 Controller\u3002<\/li>
- \u6a21\u578b\u548c\u89c6\u56fe ModelAndView\u3002<\/li>
- \u89c6\u56fe\u89e3\u6790\u5668 ViewResolver\u3002<\/li><\/ul>\n\n\n\n
102. @RequestMapping \u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
\u5c06 http \u8bf7\u6c42\u6620\u5c04\u5230\u76f8\u5e94\u7684\u7c7b\/\u65b9\u6cd5\u4e0a\u3002<\/p>\n\n\n\n
103. @Autowired \u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
@Autowired \u5b83\u53ef\u4ee5\u5bf9\u7c7b\u6210\u5458\u53d8\u91cf\u3001\u65b9\u6cd5\u53ca\u6784\u9020\u51fd\u6570\u8fdb\u884c\u6807\u6ce8\uff0c\u5b8c\u6210\u81ea\u52a8\u88c5\u914d\u7684\u5de5\u4f5c\uff0c\u901a\u8fc7@Autowired \u7684\u4f7f\u7528\u6765\u6d88\u9664 set\/get \u65b9\u6cd5\u3002<\/p>\n\n\n\n
Spring Boot\/Spring Cloud<\/h3>\n\n\n\n
104. \u4ec0\u4e48\u662f spring boot\uff1f<\/h4>\n\n\n\n
spring boot \u662f\u4e3a spring \u670d\u52a1\u7684\uff0c\u662f\u7528\u6765\u7b80\u5316\u65b0 spring \u5e94\u7528\u7684\u521d\u59cb\u642d\u5efa\u4ee5\u53ca\u5f00\u53d1\u8fc7\u7a0b\u7684\u3002<\/p>\n\n\n\n
105. \u4e3a\u4ec0\u4e48\u8981\u7528 spring boot\uff1f<\/h4>\n\n\n\n
- \u914d\u7f6e\u7b80\u5355<\/li>
- \u72ec\u7acb\u8fd0\u884c<\/li>
- \u81ea\u52a8\u88c5\u914d<\/li>
- \u65e0\u4ee3\u7801\u751f\u6210\u548c xml \u914d\u7f6e<\/li>
- \u63d0\u4f9b\u5e94\u7528\u76d1\u63a7<\/li>
- \u6613\u4e0a\u624b<\/li>
- \u63d0\u5347\u5f00\u53d1\u6548\u7387<\/li><\/ul>\n\n\n\n
106. spring boot \u6838\u5fc3\u914d\u7f6e\u6587\u4ef6\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
spring boot \u6838\u5fc3\u7684\u4e24\u4e2a\u914d\u7f6e\u6587\u4ef6\uff1a<\/p>\n\n\n\n
- bootstrap (. yml \u6216\u8005 . properties)\uff1aboostrap \u7531\u7236 ApplicationContext \u52a0\u8f7d\u7684\uff0c\u6bd4 applicaton \u4f18\u5148\u52a0\u8f7d\uff0c\u4e14 boostrap \u91cc\u9762\u7684\u5c5e\u6027\u4e0d\u80fd\u88ab\u8986\u76d6\uff1b<\/li>
- application (. yml \u6216\u8005 . properties)\uff1a\u7528\u4e8e spring boot \u9879\u76ee\u7684\u81ea\u52a8\u5316\u914d\u7f6e\u3002<\/li><\/ul>\n\n\n\n
107. spring boot \u914d\u7f6e\u6587\u4ef6\u6709\u54ea\u51e0\u79cd\u7c7b\u578b\uff1f\u5b83\u4eec\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
\u914d\u7f6e\u6587\u4ef6\u6709 . properties \u683c\u5f0f\u548c . yml \u683c\u5f0f\uff0c\u5b83\u4eec\u4e3b\u8981\u7684\u533a\u522b\u662f\u4e66\u6cd5\u98ce\u683c\u4e0d\u540c\u3002<\/p>\n\n\n\n
. properties \u914d\u7f6e\u5982\u4e0b\uff1a<\/p>\n\n\n\n
spring.RabbitMQ.port=5672<\/code><\/pre>\n\n\n\n. yml \u914d\u7f6e\u5982\u4e0b\uff1a<\/p>\n\n\n\n
spring:\n RabbitMQ:\n port: 5672<\/code><\/pre>\n\n\n\nyml \u683c\u5f0f\u4e0d\u652f\u6301 @PropertySource \u6ce8\u89e3\u5bfc\u5165\u3002<\/p>\n\n\n\n
108. spring boot \u6709\u54ea\u4e9b\u65b9\u5f0f\u53ef\u4ee5\u5b9e\u73b0\u70ed\u90e8\u7f72\uff1f<\/h4>\n\n\n\n
- \u4f7f\u7528 devtools \u542f\u52a8\u70ed\u90e8\u7f72\uff0c\u6dfb\u52a0 devtools \u5e93\uff0c\u5728\u914d\u7f6e\u6587\u4ef6\u4e2d\u628a spring. devtools. restart. enabled \u8bbe\u7f6e\u4e3a true\uff1b<\/li>
- \u4f7f\u7528 Intellij Idea \u7f16\u8f91\u5668\uff0c\u52fe\u4e0a\u81ea\u52a8\u7f16\u8bd1\u6216\u624b\u52a8\u91cd\u65b0\u7f16\u8bd1\u3002<\/li><\/ul>\n\n\n\n
109. jpa \u548c hibernate \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
jpa \u5168\u79f0 Java Persistence API\uff0c\u662f Java \u6301\u4e45\u5316\u63a5\u53e3\u89c4\u8303\uff0chibernate \u5c5e\u4e8e jpa \u7684\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n\n\n\n
110. \u4ec0\u4e48\u662f spring cloud\uff1f<\/h4>\n\n\n\n
spring cloud \u662f\u4e00\u7cfb\u5217\u6846\u67b6\u7684\u6709\u5e8f\u96c6\u5408\u3002\u5b83\u5229\u7528 spring boot \u7684\u5f00\u53d1\u4fbf\u5229\u6027\u5de7\u5999\u5730\u7b80\u5316\u4e86\u5206\u5e03\u5f0f\u7cfb\u7edf\u57fa\u7840\u8bbe\u65bd\u7684\u5f00\u53d1\uff0c\u5982\u670d\u52a1\u53d1\u73b0\u6ce8\u518c\u3001\u914d\u7f6e\u4e2d\u5fc3\u3001\u6d88\u606f\u603b\u7ebf\u3001\u8d1f\u8f7d\u5747\u8861\u3001\u65ad\u8def\u5668\u3001\u6570\u636e\u76d1\u63a7\u7b49\uff0c\u90fd\u53ef\u4ee5\u7528 spring boot \u7684\u5f00\u53d1\u98ce\u683c\u505a\u5230\u4e00\u952e\u542f\u52a8\u548c\u90e8\u7f72\u3002<\/p>\n\n\n\n
111. spring cloud \u65ad\u8def\u5668\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n
\u5728\u5206\u5e03\u5f0f\u67b6\u6784\u4e2d\uff0c\u65ad\u8def\u5668\u6a21\u5f0f\u7684\u4f5c\u7528\u4e5f\u662f\u7c7b\u4f3c\u7684\uff0c\u5f53\u67d0\u4e2a\u670d\u52a1\u5355\u5143\u53d1\u751f\u6545\u969c\uff08\u7c7b\u4f3c\u7528\u7535\u5668\u53d1\u751f\u77ed\u8def\uff09\u4e4b\u540e\uff0c\u901a\u8fc7\u65ad\u8def\u5668\u7684\u6545\u969c\u76d1\u63a7\uff08\u7c7b\u4f3c\u7194\u65ad\u4fdd\u9669\u4e1d\uff09\uff0c\u5411\u8c03\u7528\u65b9\u8fd4\u56de\u4e00\u4e2a\u9519\u8bef\u54cd\u5e94\uff0c\u800c\u4e0d\u662f\u957f\u65f6\u95f4\u7684\u7b49\u5f85\u3002\u8fd9\u6837\u5c31\u4e0d\u4f1a\u4f7f\u5f97\u7ebf\u7a0b\u56e0\u8c03\u7528\u6545\u969c\u670d\u52a1\u88ab\u957f\u65f6\u95f4\u5360\u7528\u4e0d\u91ca\u653e\uff0c\u907f\u514d\u4e86\u6545\u969c\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u7684\u8513\u5ef6\u3002<\/p>\n\n\n\n
112. spring cloud \u7684\u6838\u5fc3\u7ec4\u4ef6\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n
- Eureka\uff1a\u670d\u52a1\u6ce8\u518c\u4e8e\u53d1\u73b0\u3002<\/li>
- Feign\uff1a\u57fa\u4e8e\u52a8\u6001\u4ee3\u7406\u673a\u5236\uff0c\u6839\u636e\u6ce8\u89e3\u548c\u9009\u62e9\u7684\u673a\u5668\uff0c\u62fc\u63a5\u8bf7\u6c42 url \u5730\u5740\uff0c\u53d1\u8d77\u8bf7\u6c42\u3002<\/li>
- Ribbon\uff1a\u5b9e\u73b0\u8d1f\u8f7d\u5747\u8861\uff0c\u4ece\u4e00\u4e2a\u670d\u52a1\u7684\u591a\u53f0\u673a\u5668\u4e2d\u9009\u62e9\u4e00\u53f0\u3002<\/li>
- Hystrix\uff1a\u63d0\u4f9b\u7ebf\u7a0b\u6c60\uff0c\u4e0d\u540c\u7684\u670d\u52a1\u8d70\u4e0d\u540c\u7684\u7ebf\u7a0b\u6c60\uff0c\u5b9e\u73b0\u4e86\u4e0d\u540c\u670d\u52a1\u8c03\u7528\u7684\u9694\u79bb\uff0c\u907f\u514d\u4e86\u670d\u52a1\u96ea\u5d29\u7684\u95ee\u9898\u3002<\/li>
- Zuul\uff1a\u7f51\u5173\u7ba1\u7406\uff0c\u7531 Zuul \u7f51\u5173\u8f6c\u53d1\u8bf7\u6c42\u7ed9\u5bf9\u5e94\u7684\u670d\u52a1\u3002<\/li><\/ul>\n\n\n\n
Hibernate<\/h3>\n\n\n\n
113. \u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528 hibernate\uff1f<\/h4>\n\n\n\n
- hibernate \u662f\u5bf9 jdbc \u7684\u5c01\u88c5\uff0c\u5927\u5927\u7b80\u5316\u4e86\u6570\u636e\u8bbf\u95ee\u5c42\u7684\u7e41\u7410\u7684\u91cd\u590d\u6027\u4ee3\u7801\u3002<\/li>
- hibernate \u662f\u4e00\u4e2a\u4f18\u79c0\u7684 ORM \u5b9e\u73b0\uff0c\u5f88\u591a\u7a0b\u5ea6\u4e0a\u7b80\u5316\u4e86 DAO \u5c42\u7684\u7f16\u7801\u529f\u80fd\u3002<\/li>
- \u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u8fdb\u884c\u6570\u636e\u5e93\u7684\u79fb\u690d\u5de5\u4f5c\u3002<\/li>
- \u63d0\u4f9b\u4e86\u7f13\u5b58\u673a\u5236\uff0c\u662f\u7a0b\u5e8f\u6267\u884c\u66f4\u6539\u7684\u9ad8\u6548\u3002<\/li><\/ul>\n\n\n\n
114. \u4ec0\u4e48\u662f ORM \u6846\u67b6\uff1f<\/h4>\n\n\n\n
ORM\uff08Object Relation Mapping\uff09\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\uff0c\u662f\u628a\u6570\u636e\u5e93\u4e2d\u7684\u5173\u7cfb\u6570\u636e\u6620\u5c04\u6210\u4e3a\u7a0b\u5e8f\u4e2d\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n
\u4f7f\u7528 ORM \u7684\u4f18\u70b9\uff1a\u63d0\u9ad8\u4e86\u5f00\u53d1\u6548\u7387\u964d\u4f4e\u4e86\u5f00\u53d1\u6210\u672c\u3001\u5f00\u53d1\u66f4\u7b80\u5355\u66f4\u5bf9\u8c61\u5316\u3001\u53ef\u79fb\u690d\u66f4\u5f3a\u3002<\/p>\n\n\n\n
115. hibernate \u4e2d\u5982\u4f55\u5728\u63a7\u5236\u53f0\u67e5\u770b\u6253\u5370\u7684 SQL \u8bed\u53e5\uff1f<\/h4>\n\n\n\n
\u5728 Config \u91cc\u9762\u628a hibernate. show_SQL \u8bbe\u7f6e\u4e3a true \u5c31\u53ef\u4ee5\u3002\u4f46\u4e0d\u5efa\u8bae\u5f00\u542f\uff0c\u5f00\u542f\u4e4b\u540e\u4f1a\u964d\u4f4e\u7a0b\u5e8f\u7684\u8fd0\u884c\u6548\u7387\u3002<\/p>\n\n\n\n
116. hibernate \u6709\u51e0\u79cd\u67e5\u8be2\u65b9\u5f0f\uff1f<\/h4>\n\n\n\n
\u4e09\u79cd\uff1ahql\u3001\u539f\u751f SQL\u3001\u6761\u4ef6\u67e5\u8be2 Criteria\u3002<\/p>\n\n\n\n
117. hibernate \u5b9e\u4f53\u7c7b\u53ef\u4ee5\u88ab\u5b9a\u4e49\u4e3a final \u5417\uff1f<\/h4>\n\n\n\n
\u5b9e\u4f53\u7c7b\u53ef\u4ee5\u5b9a\u4e49\u4e3a final \u7c7b\uff0c\u4f46\u8fd9\u6837\u7684\u8bdd\u5c31\u4e0d\u80fd\u4f7f\u7528 hibernate \u4ee3\u7406\u6a21\u5f0f\u4e0b\u7684\u5ef6\u8fdf\u5173\u8054\u63d0\u4f9b\u6027\u80fd\u4e86\uff0c\u6240\u4ee5\u4e0d\u5efa\u8bae\u5b9a\u4e49\u5b9e\u4f53\u7c7b\u4e3a final\u3002<\/p>\n\n\n\n
118. \u5728 hibernate \u4e2d\u4f7f\u7528 Integer \u548c int \u505a\u6620\u5c04\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n
Integer \u7c7b\u578b\u4e3a\u5bf9\u8c61\uff0c\u5b83\u7684\u503c\u5141\u8bb8\u4e3a null\uff0c\u800c int \u5c5e\u4e8e\u57fa\u7840\u6570\u636e\u7c7b\u578b\uff0c\u503c\u4e0d\u80fd\u4e3a null\u3002<\/p>\n\n\n\n
119. hibernate \u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/h4>\n\n\n\n
- \u8bfb\u53d6\u5e76\u89e3\u6790\u914d\u7f6e\u6587\u4ef6\u3002<\/li>
- \u8bfb\u53d6\u5e76\u89e3\u6790\u6620\u5c04\u6587\u4ef6\uff0c\u521b\u5efa SessionFactory\u3002<\/li>
- \u6253\u5f00 Session\u3002<\/li>
- \u521b\u5efa\u4e8b\u52a1\u3002<\/li>
- \u8fdb\u884c\u6301\u4e45\u5316\u64cd\u4f5c\u3002<\/li>
- \u63d0\u4ea4\u4e8b\u52a1\u3002<\/li>
- \u5173\u95ed Session\u3002<\/li>
- \u5173\u95ed SessionFactory\u3002<\/li><\/ul>\n\n\n\n
120. get()\u548c load()\u7684\u533a\u522b\uff1f<\/h4>\n\n\n\n