{"id":3971,"date":"2019-03-08T18:35:07","date_gmt":"2019-03-08T10:35:07","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=3971"},"modified":"2019-03-08T18:35:07","modified_gmt":"2019-03-08T10:35:07","slug":"%e5%88%86%e4%ba%ab%e5%87%a0%e4%b8%aa%e4%bd%a0%e5%8f%af%e8%83%bd%e5%bf%bd%e8%a7%86%e7%9a%84-java-%e9%9d%a2%e8%af%95%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=3971","title":{"rendered":"\u5206\u4eab\u51e0\u4e2a\u4f60\u53ef\u80fd\u5ffd\u89c6\u7684 java \u9762\u8bd5\u9898"},"content":{"rendered":"

\n\t3\u30014 \u6708\u4efd\u662f\u9762\u8bd5\u7684\u9ec4\u91d1\u5b63\uff0c\u6700\u8fd1\u4e0d\u7ba1\u662f\u77e5\u4e4e\u8fd8\u662f\u5fae\u4fe1\u91cc\uff0c\u90fd\u6709\u4e0d\u662f\u4eba\u5728\u95ee\u6211\u8981\u8d44\u6599\uff0c\u4e5f\u6216\u8005\u662f\u8ba9\u6211\u4e0b\u8f7d\u4e00\u4e9b\u9762\u8bd5\u8d44\u6599\u3002\n<\/p>\n

\n\t\u6240\u4ee5\uff0c\u6211\u8fd8\u662f\u5206\u4eab\u4e00\u4e9b\u7b80\u5355\u7684\u9762\u8bd5\u9898\u5427\uff0c\u5e0c\u671b\u80fd\u591f\u5e2e\u52a9\u5230\u4f60\u4eec\uff01\n<\/p>\n

\n\t\"\u7a0b\u5e8f\u5458\u9762\u8bd5\"\n<\/p>\n

\n\t\u9762\u8bd5\u5176\u5b9e\u5c31\u662f\u9760\u590d\u4e60\uff0c\u590d\u4e60\u7684\u597d\uff0c\u5c31\u5bb9\u6613\u627e\u5230\u5de5\u4f5c\uff01\n<\/p>\n

\n\t\u90a3\u4e9b\u9762\u8bd5\u597d\u51e0\u6b21\u90fd\u6ca1\u6709\u9762\u8bd5\u4e0a\u7684\uff0c\u9762\u8bd5\u7684\u591a\u4e86\uff0c\u89c1\u7684\u9898\u591a\u4e86\u3002\u6700\u540e\u4e0d\u90fd\u627e\u5230\u4e86\u5de5\u4f5c\u5417\uff1f\u6240\u4ee5\u8bf4\uff0c\u6ca1\u6709\u5dee\u7684\u7a0b\u5e8f\u5458\uff0c\u53ea\u6709\u61d2\u7684\u7a0b\u5e8f\u5458\uff01\n<\/p>\n

\n\t\u95ee\uff1aJava \u4e2d\u80fd\u521b\u5efa volatile \u6570\u7ec4\u5417\uff1f\n<\/p>\n

\n\t\u7b54\uff1a\u80fd\uff0cJava \u4e2d\u53ef\u4ee5\u521b\u5efa volatile \u7c7b\u578b\u6570\u7ec4\uff0c\u4e0d\u8fc7\u53ea\u662f\u4e00\u4e2a\u6307\u5411\u6570\u7ec4\u7684\u5f15\u7528\uff0c\u800c\u4e0d\u662f\u6574\u4e2a\u6570\u7ec4\u3002\u6211\u7684\u610f\u601d\u662f\uff0c\u5982\u679c\u6539\u53d8\u5f15\u7528\u6307\u5411\u7684\u6570\u7ec4\uff0c\u5c06\u4f1a\u53d7\u5230 volatile \u7684\u4fdd\u62a4\uff0c\u4f46\u662f\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6539\u53d8\u6570\u7ec4\u7684\u5143\u7d20\uff0cvolatile \u6807\u793a\u7b26\u5c31\u4e0d\u80fd\u8d77\u5230\u4e4b\u524d\u7684\u4fdd\u62a4\u4f5c\u7528\u4e86\u3002\n<\/p>\n

\n\t\u95ee\uff1avolatile \u80fd\u4f7f\u5f97\u4e00\u4e2a\u975e\u539f\u5b50\u64cd\u4f5c\u53d8\u6210\u539f\u5b50\u64cd\u4f5c\u5417\uff1f\n<\/p>\n

\n\t\u7b54\uff1a\u4e00\u4e2a\u5178\u578b\u7684\u4f8b\u5b50\u662f\u5728\u7c7b\u4e2d\u6709\u4e00\u4e2a long \u7c7b\u578b\u7684\u6210\u5458\u53d8\u91cf\u3002\u5982\u679c\u4f60\u77e5\u9053\u8be5\u6210\u5458\u53d8\u91cf\u4f1a\u88ab\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\uff0c\u5982\u8ba1\u6570\u5668\u3001\u4ef7\u683c\u7b49\uff0c\u4f60\u6700\u597d\u662f\u5c06\u5176\u8bbe\u7f6e\u4e3a volatile\u3002\u4e3a\u4ec0\u4e48\uff1f\u56e0\u4e3a Java \u4e2d\u8bfb\u53d6 long \u7c7b\u578b\u53d8\u91cf\u4e0d\u662f\u539f\u5b50\u7684\uff0c\u9700\u8981\u5206\u6210\u4e24\u6b65\uff0c\u5982\u679c\u4e00\u4e2a\u7ebf\u7a0b\u6b63\u5728\u4fee\u6539\u8be5 long \u53d8\u91cf\u7684\u503c\uff0c\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u53ea\u80fd\u770b\u5230\u8be5\u503c\u7684\u4e00\u534a\uff08\u524d 32 \u4f4d\uff09\u3002\u4f46\u662f\u5bf9\u4e00\u4e2a volatile \u578b\u7684 long \u6216 double \u53d8\u91cf\u7684\u8bfb\u5199\u662f\u539f\u5b50\u3002\n<\/p>\n

\n\t\u95ee\uff1avolatile \u4fee\u9970\u7b26\u7684\u6709\u8fc7\u4ec0\u4e48\u5b9e\u8df5\uff1f\n<\/p>\n

\n\t\u7b54\uff1a\u4e00\u79cd\u5b9e\u8df5\u662f\u7528 volatile \u4fee\u9970 long \u548c double \u53d8\u91cf\uff0c\u4f7f\u5176\u80fd\u6309\u539f\u5b50\u7c7b\u578b\u6765\u8bfb\u5199\u3002double \u548c long \u90fd\u662f64\u4f4d\u5bbd\uff0c\u56e0\u6b64\u5bf9\u8fd9\u4e24\u79cd\u7c7b\u578b\u7684\u8bfb\u662f\u5206\u4e3a\u4e24\u90e8\u5206\u7684\uff0c\u7b2c\u4e00\u6b21\u8bfb\u53d6\u7b2c\u4e00\u4e2a 32 \u4f4d\uff0c\u7136\u540e\u518d\u8bfb\u5269\u4e0b\u7684 32 \u4f4d\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u4e0d\u662f\u539f\u5b50\u7684\uff0c\u4f46 Java \u4e2d volatile \u578b\u7684 long \u6216 double \u53d8\u91cf\u7684\u8bfb\u5199\u662f\u539f\u5b50\u7684\u3002volatile \u4fee\u590d\u7b26\u7684\u53e6\u4e00\u4e2a\u4f5c\u7528\u662f\u63d0\u4f9b\u5185\u5b58\u5c4f\u969c\uff08memory barrier\uff09\uff0c\u4f8b\u5982\u5728\u5206\u5e03\u5f0f\u6846\u67b6\u4e2d\u7684\u5e94\u7528\u3002\u7b80\u5355\u7684\u8bf4\uff0c\u5c31\u662f\u5f53\u4f60\u5199\u4e00\u4e2a volatile \u53d8\u91cf\u4e4b\u524d\uff0cJava \u5185\u5b58\u6a21\u578b\u4f1a\u63d2\u5165\u4e00\u4e2a\u5199\u5c4f\u969c\uff08write barrier\uff09\uff0c\u8bfb\u4e00\u4e2a volatile \u53d8\u91cf\u4e4b\u524d\uff0c\u4f1a\u63d2\u5165\u4e00\u4e2a\u8bfb\u5c4f\u969c\uff08read barrier\uff09\u3002\u610f\u601d\u5c31\u662f\u8bf4\uff0c\u5728\u4f60\u5199\u4e00\u4e2a volatile \u57df\u65f6\uff0c\u80fd\u4fdd\u8bc1\u4efb\u4f55\u7ebf\u7a0b\u90fd\u80fd\u770b\u5230\u4f60\u5199\u7684\u503c\uff0c\u540c\u65f6\uff0c\u5728\u5199\u4e4b\u524d\uff0c\u4e5f\u80fd\u4fdd\u8bc1\u4efb\u4f55\u6570\u503c\u7684\u66f4\u65b0\u5bf9\u6240\u6709\u7ebf\u7a0b\u662f\u53ef\u89c1\u7684\uff0c\u56e0\u4e3a\u5185\u5b58\u5c4f\u969c\u4f1a\u5c06\u5176\u4ed6\u6240\u6709\u5199\u7684\u503c\u66f4\u65b0\u5230\u7f13\u5b58\u3002\n<\/p>\n

\n\t\u95ee\uff1avolatile \u7c7b\u578b\u53d8\u91cf\u63d0\u4f9b\u4ec0\u4e48\u4fdd\u8bc1\uff1f\n<\/p>\n

\n\t\u7b54\uff1avolatile \u53d8\u91cf\u63d0\u4f9b\u987a\u5e8f\u548c\u53ef\u89c1\u6027\u4fdd\u8bc1\uff0c\u4f8b\u5982\uff0cJVM \u6216\u8005 JIT\u4e3a\u4e86\u83b7\u5f97\u66f4\u597d\u7684\u6027\u80fd\u4f1a\u5bf9\u8bed\u53e5\u91cd\u6392\u5e8f\uff0c\u4f46\u662f volatile \u7c7b\u578b\u53d8\u91cf\u5373\u4f7f\u5728\u6ca1\u6709\u540c\u6b65\u5757\u7684\u60c5\u51b5\u4e0b\u8d4b\u503c\u4e5f\u4e0d\u4f1a\u4e0e\u5176\u4ed6\u8bed\u53e5\u91cd\u6392\u5e8f\u3002 volatile \u63d0\u4f9b happens-before \u7684\u4fdd\u8bc1\uff0c\u786e\u4fdd\u4e00\u4e2a\u7ebf\u7a0b\u7684\u4fee\u6539\u80fd\u5bf9\u5176\u4ed6\u7ebf\u7a0b\u662f\u53ef\u89c1\u7684\u3002\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0cvolatile \u8fd8\u80fd\u63d0\u4f9b\u539f\u5b50\u6027\uff0c\u5982\u8bfb 64 \u4f4d\u6570\u636e\u7c7b\u578b\uff0c\u50cf long \u548c double \u90fd\u4e0d\u662f\u539f\u5b50\u7684\uff0c\u4f46 volatile \u7c7b\u578b\u7684 double \u548c long \u5c31\u662f\u539f\u5b50\u7684\u3002\n<\/p>\n

\n\t\u95ee\uff1aJava \u4e2d sleep \u65b9\u6cd5\u548c wait \u65b9\u6cd5\u7684\u533a\u522b\uff1f\n<\/p>\n

\n\t\u7b54\uff1a\u867d\u7136\u4e24\u8005\u90fd\u662f\u7528\u6765\u6682\u505c\u5f53\u524d\u8fd0\u884c\u7684\u7ebf\u7a0b\uff0c\u4f46\u662f sleep() \u5b9e\u9645\u4e0a\u53ea\u662f\u77ed\u6682\u505c\u987f\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4f1a\u91ca\u653e\u9501\uff0c\u800c wait() \u610f\u5473\u7740\u6761\u4ef6\u7b49\u5f85\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u8be5\u65b9\u6cd5\u8981\u91ca\u653e\u9501\uff0c\u56e0\u4e3a\u53ea\u6709\u8fd9\u6837\uff0c\u5176\u4ed6\u7b49\u5f85\u7684\u7ebf\u7a0b\u624d\u80fd\u5728\u6ee1\u8db3\u6761\u4ef6\u65f6\u83b7\u53d6\u5230\u8be5\u9501\u3002\n<\/p>\n

\n\t\u63a8\u8350\u9605\u8bfb\uff1a\u300a\u4ee3\u7801\u4e2d\u7684Thread.sleep(0) \u6709\u4ec0\u4e48\u610f\u4e49\uff1f\u662f\u5199\u9519\u4e86\u5417\uff1f<\/a>\u300b\uff0c\u300ajava\u7ebf\u7a0b\u6700\u719f\u6089\u800c\u53c8\u964c\u751f\u7684\u77e5\u8bc6\u70b9\uff1asleep\u4e0ewait<\/a>\u300b\u3002\n<\/p>\n

\n\t\u95ee\uff1a\u4ec0\u4e48\u662f\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff08immutable object\uff09\uff1fJava \u4e2d\u600e\u4e48\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff1f\n<\/p>\n

\n\t\u7b54\uff1a\u4e0d\u53ef\u53d8\u5bf9\u8c61\u6307\u5bf9\u8c61\u4e00\u65e6\u88ab\u521b\u5efa\uff0c\u72b6\u6001\u5c31\u4e0d\u80fd\u518d\u6539\u53d8\u3002\u4efb\u4f55\u4fee\u6539\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff0c\u5982 String\u3001Integer\u53ca\u5176\u5b83\u5305\u88c5\u7c7b\u3002\u8be6\u60c5\u53c2\u89c1\u7b54\u6848\uff0c\u4e00\u6b65\u4e00\u6b65\u6307\u5bfc\u4f60\u5728 Java \u4e2d\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u7c7b\u3002\n<\/p>\n

\n\t\u63a8\u8350\u9605\u8bfb\uff1a\u300aString \u7684“\u4e0d\u53ef\u53d8\u6027”\u662f\u56e0\u4e3a final\uff1f\u8bf7\u522b\u518d\u9519\u4e0b\u53bb\u4e86\uff01<\/a>\u300b\u3001\u300a\u6b32\u7ec3\u795e\u529f\u5fc5\u5148\u81ea\u5bab\uff0cString \u81ea\u5bab\u540e“\u4e0d\u53ef\u53d8\u6027”\u5230\u5e95\u6709\u5565\u597d\u5904\uff1f<\/a>\u300b\u3001\u300aJava 11 \u66f4\u65b0\u4e86 String \u5b57\u7b26\u4e32 API\uff0c\u4f60\u5f97\u91cd\u65b0\u8ba4\u8bc6\u5b83<\/a>\u300b\u3002\n<\/p>\n

\n\t\u95ee\uff1aJava \u4e2d ++ \u64cd\u4f5c\u7b26\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u5417\uff1f\n<\/p>\n

\n\t\u7b54\uff1a\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u64cd\u4f5c\u3002\u5b83\u6d89\u53ca\u5230\u591a\u4e2a\u6307\u4ee4\uff0c\u5982\u8bfb\u53d6\u53d8\u91cf\u503c\uff0c\u589e\u52a0\uff0c\u7136\u540e\u5b58\u50a8\u56de\u5185\u5b58\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u53ef\u80fd\u4f1a\u51fa\u73b0\u591a\u4e2a\u7ebf\u7a0b\u4ea4\u5dee\u3002\n<\/p>\n

\n\t\u63a8\u8350\u9605\u8bfb\uff1a\u300a\u4ece i++ \u548c ++i \u8bf4\u8d77\u5c40\u90e8\u53d8\u91cf\u8868\u548c\u64cd\u4f5c\u6570\u6808\uff01<\/a>\u300b\u3002\n<\/p>\n

\n\t\u95ee\uff1aa = a + b \u4e0e a += b \u7684\u533a\u522b\uff1f\n<\/p>\n

\n\t\u7b54\uff1a+= \u9690\u5f0f\u7684\u5c06\u52a0\u64cd\u4f5c\u7684\u7ed3\u679c\u7c7b\u578b\u5f3a\u5236\u8f6c\u6362\u4e3a\u6301\u6709\u7ed3\u679c\u7684\u7c7b\u578b\u3002\u5982\u679c\u4e24\u8fd9\u4e2a\u6574\u578b\u76f8\u52a0\uff0c\u5982 byte\u3001short \u6216\u8005 int\uff0c\u9996\u5148\u4f1a\u5c06\u5b83\u4eec\u63d0\u5347\u5230 int \u7c7b\u578b\uff0c\u7136\u540e\u5728\u6267\u884c\u52a0\u6cd5\u64cd\u4f5c\u3002\u5982\u679c\u52a0\u6cd5\u64cd\u4f5c\u7684\u7ed3\u679c\u6bd4 a \u7684\u6700\u5927\u503c\u8981\u5927\uff0c\u5219 a+b \u4f1a\u51fa\u73b0\u7f16\u8bd1\u9519\u8bef\uff0c\u4f46\u662f a += b \u6ca1\u95ee\u9898\uff0c\u5982\u4e0b\uff1a\n<\/p>\n

\r\nbyte a = 127;\r\nbyte b = 127;\r\nb = a + b; \/\/ error : cannot convert from int to byte\r\nb += a; \/\/ ok<\/pre>\n
\n\t\u95ee\uff1a3*0.1 == 0.3 \u5c06\u4f1a\u8fd4\u56de\u4ec0\u4e48\uff1ftrue \u8fd8\u662f false\uff1f\n<\/p>\n
\n\t\u7b54\uff1afalse\uff0c\u56e0\u4e3a\u6709\u4e9b\u6d6e\u70b9\u6570\u4e0d\u80fd\u5b8c\u5168\u7cbe\u786e\u7684\u8868\u793a\u51fa\u6765\u3002\n<\/p>\n
\n\t\u95ee\uff1aSerial \u4e0e Parallel GC\u4e4b\u95f4\u7684\u4e0d\u540c\u4e4b\u5904\uff1f\n<\/p>\n
\n\t\u7b54\uff1aSerial \u4e0e Parallel \u5728GC\u6267\u884c\u7684\u65f6\u5019\u90fd\u4f1a\u5f15\u8d77 stop-the-world\u3002\u5b83\u4eec\u4e4b\u95f4\u4e3b\u8981\u4e0d\u540c serial \u6536\u96c6\u5668\u662f\u9ed8\u8ba4\u7684\u590d\u5236\u6536\u96c6\u5668\uff0c\u6267\u884c GC \u7684\u65f6\u5019\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u800c parallel \u6536\u96c6\u5668\u4f7f\u7528\u591a\u4e2a GC \u7ebf\u7a0b\u6765\u6267\u884c\u3002\n<\/p>\n
\n\t\u95ee\uff1a32 \u4f4d\u548c 64 \u4f4d\u7684 JVM\uff0cint \u7c7b\u578b\u53d8\u91cf\u7684\u957f\u5ea6\u662f\u591a\u6570\uff1f\n<\/p>\n
\n\t\u7b54\uff1a32 \u4f4d\u548c 64 \u4f4d\u7684 JVM \u4e2d\uff0cint \u7c7b\u578b\u53d8\u91cf\u7684\u957f\u5ea6\u662f\u76f8\u540c\u7684\uff0c\u90fd\u662f 32 \u4f4d\u6216\u8005 4 \u4e2a\u5b57\u8282\u3002\n<\/p>\n
\n\t\u95ee\uff1aJava \u4e2d WeakReference \u4e0e SoftReference\u7684\u533a\u522b\uff1f\n<\/p>\n
\n\t\u7b54\uff1a\u867d\u7136 WeakReference \u4e0e SoftReference \u90fd\u6709\u5229\u4e8e\u63d0\u9ad8 GC \u548c \u5185\u5b58\u7684\u6548\u7387\uff0c\u4f46\u662f WeakReference \uff0c\u4e00\u65e6\u5931\u53bb\u6700\u540e\u4e00\u4e2a\u5f3a\u5f15\u7528\uff0c\u5c31\u4f1a\u88ab GC \u56de\u6536\uff0c\u800c\u8f6f\u5f15\u7528\u867d\u7136\u4e0d\u80fd\u963b\u6b62\u88ab\u56de\u6536\uff0c\u4f46\u662f\u53ef\u4ee5\u5ef6\u8fdf\u5230 JVM \u5185\u5b58\u4e0d\u8db3\u7684\u65f6\u5019\u3002\n<\/p>\n
\n\t\u95ee\uff1a\u89e3\u91ca Java \u5806\u7a7a\u95f4\u53ca GC\uff1f\n<\/p>\n
\n\t\u7b54\uff1a\u5f53\u901a\u8fc7 Java \u547d\u4ee4\u542f\u52a8 Java \u8fdb\u7a0b\u7684\u65f6\u5019\uff0c\u4f1a\u4e3a\u5b83\u5206\u914d\u5185\u5b58\u3002\u5185\u5b58\u7684\u4e00\u90e8\u5206\u7528\u4e8e\u521b\u5efa\u5806\u7a7a\u95f4\uff0c\u5f53\u7a0b\u5e8f\u4e2d\u521b\u5efa\u5bf9\u8c61\u7684\u65f6\u5019\uff0c\u5c31\u4ece\u5bf9\u7a7a\u95f4\u4e2d\u5206\u914d\u5185\u5b58\u3002GC \u662f JVM \u5185\u90e8\u7684\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u56de\u6536\u65e0\u6548\u5bf9\u8c61\u7684\u5185\u5b58\u7528\u4e8e\u5c06\u6765\u7684\u5206\u914d\u3002\n<\/p>\n
\n\t\u95ee\uff1a\u4f60\u80fd\u4fdd\u8bc1 GC \u6267\u884c\u5417\uff1f\n<\/p>\n
\n\t\u7b54\uff1a\u4e0d\u80fd\uff0c\u867d\u7136\u4f60\u53ef\u4ee5\u8c03\u7528 System.gc() \u6216\u8005 Runtime.gc()\uff0c\u4f46\u662f\u6ca1\u6709\u529e\u6cd5\u4fdd\u8bc1 GC \u7684\u6267\u884c\u3002\n<\/p>\n
\n\t\u95ee\uff1aList\u3001Set\u3001Map \u548c Queue \u4e4b\u95f4\u7684\u533a\u522b\n<\/p>\n
\n\t\u7b54\uff1aList \u662f\u4e00\u4e2a\u6709\u5e8f\u96c6\u5408\uff0c\u5141\u8bb8\u5143\u7d20\u91cd\u590d\u3002\u5b83\u7684\u67d0\u4e9b\u5b9e\u73b0\u53ef\u4ee5\u63d0\u4f9b\u57fa\u4e8e\u4e0b\u6807\u503c\u7684\u5e38\u91cf\u8bbf\u95ee\u65f6\u95f4\uff0c\u4f46\u662f\u8fd9\u4e0d\u662f List \u63a5\u53e3\u4fdd\u8bc1\u7684\u3002Set \u662f\u4e00\u4e2a\u65e0\u5e8f\u96c6\u5408\u3002\n<\/p>\n
\n\t\u95ee\uff1a\u961f\u5217\u7684 poll() \u65b9\u6cd5\u548c remove() \u65b9\u6cd5\u7684\u533a\u522b\uff1f\n<\/p>\n
\n\t\u7b54\uff1apoll() \u548c remove() \u90fd\u662f\u4ece\u961f\u5217\u4e2d\u53d6\u51fa\u4e00\u4e2a\u5143\u7d20\uff0c\u4f46\u662f poll() \u5728\u83b7\u53d6\u5143\u7d20\u5931\u8d25\u7684\u65f6\u5019\u4f1a\u8fd4\u56de\u7a7a\uff0c\u4f46\u662f remove() \u5931\u8d25\u7684\u65f6\u5019\u4f1a\u629b\u51fa\u5f02\u5e38\u3002\n<\/p>\n
\n\t\u95ee\uff1a\u7528\u54ea\u4e24\u79cd\u65b9\u5f0f\u6765\u5b9e\u73b0\u96c6\u5408\u7684\u6392\u5e8f\uff1f\n<\/p>\n
\n\t\u7b54\uff1a\u4f60\u53ef\u4ee5\u4f7f\u7528\u6709\u5e8f\u96c6\u5408\uff0c\u5982 TreeSet \u6216 TreeMap\uff0c\u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6709\u987a\u5e8f\u7684\u7684\u96c6\u5408\uff0c\u5982 list\uff0c\u7136\u540e\u901a\u8fc7 Collections.sort() \u6765\u6392\u5e8f\u3002\n<\/p>\n
\n\t\u95ee\uff1aJava \u4e2d\u600e\u4e48\u6253\u5370\u6570\u7ec4\uff1f\n<\/p>\n
\n\t\u7b54\uff1a\u4f60\u53ef\u4ee5\u4f7f\u7528 Arrays.toString() \u548c Arrays.deepToString() \u65b9\u6cd5\u6765\u6253\u5370\u6570\u7ec4\u3002\u7531\u4e8e\u6570\u7ec4\u6ca1\u6709\u5b9e\u73b0 toString() \u65b9\u6cd5\uff0c\u6240\u4ee5\u5982\u679c\u5c06\u6570\u7ec4\u4f20\u9012\u7ed9 System.out.println() \u65b9\u6cd5\uff0c\u5c06\u65e0\u6cd5\u6253\u5370\u51fa\u6570\u7ec4\u7684\u5185\u5bb9\uff0c\u4f46\u662f Arrays.toString() \u53ef\u4ee5\u6253\u5370\u6bcf\u4e2a\u5143\u7d20\u3002\n<\/p>\n
\n\t\u95ee\uff1aJava \u4e2d\uff0c\u7f16\u5199\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u7684\u65f6\u5019\u4f60\u4f1a\u9075\u5faa\u54ea\u4e9b\u6700\u4f73\u5b9e\u8df5\uff1f\n<\/p>\n
\n\t\u7b54\uff1a\u6700\u4f73\u5b9e\u8df5\uff1a\u7ed9\u7ebf\u7a0b\u547d\u540d\uff0c\u8fd9\u6837\u53ef\u4ee5\u5e2e\u52a9\u8c03\u8bd5\uff1b\u6700\u5c0f\u5316\u540c\u6b65\u7684\u8303\u56f4\uff0c\u800c\u4e0d\u662f\u5c06\u6574\u4e2a\u65b9\u6cd5\u540c\u6b65\uff0c\u53ea\u5bf9\u5173\u952e\u90e8\u5206\u505a\u540c\u6b65\uff1b\u5982\u679c\u53ef\u4ee5\uff0c\u66f4\u504f\u5411\u4e8e\u4f7f\u7528 volatile \u800c\u4e0d\u662f synchronized\uff1b\u4f7f\u7528\u66f4\u9ad8\u5c42\u6b21\u7684\u5e76\u53d1\u5de5\u5177\uff0c\u800c\u4e0d\u662f\u4f7f\u7528 wait() \u548c notify() \u6765\u5b9e\u73b0\u7ebf\u7a0b\u95f4\u901a\u4fe1\uff0c\u5982 BlockingQueue\uff0cCountDownLatch \u53ca Semeaphore\uff1b\u4f18\u5148\u4f7f\u7528\u5e76\u53d1\u96c6\u5408\uff0c\u800c\u4e0d\u662f\u5bf9\u96c6\u5408\u8fdb\u884c\u540c\u6b65\u3002\u5e76\u53d1\u96c6\u5408\u63d0\u4f9b\u66f4\u597d\u7684\u53ef\u6269\u5c55\u6027\u3002\n<\/p>\n
\n\t\u95ee\uff1a\u8bf4\u51fa\u51e0\u70b9 Java \u4e2d\u4f7f\u7528 Collections \u7684\u6700\u4f73\u5b9e\u8df5\uff1f\n<\/p>\n
\n\t\u7b54\uff1a\u6700\u4f73\u5b9e\u8df5\uff1a\u4f7f\u7528\u6b63\u786e\u7684\u96c6\u5408\u7c7b\uff0c\u4f8b\u5982\uff0c\u5982\u679c\u4e0d\u9700\u8981\u540c\u6b65\u5217\u8868\uff0c\u4f7f\u7528 ArrayList \u800c\u4e0d\u662f Vector\uff1b\u4f18\u5148\u4f7f\u7528\u5e76\u53d1\u96c6\u5408\uff0c\u800c\u4e0d\u662f\u5bf9\u96c6\u5408\u8fdb\u884c\u540c\u6b65\u3002\u5e76\u53d1\u96c6\u5408\u63d0\u4f9b\u66f4\u597d\u7684\u53ef\u6269\u5c55\u6027\uff1b\u4f7f\u7528\u63a5\u53e3\u4ee3\u8868\u548c\u8bbf\u95ee\u96c6\u5408\uff0c\u5982\u4f7f\u7528List\u5b58\u50a8 ArrayList\uff0c\u4f7f\u7528 Map \u5b58\u50a8 HashMap \u7b49\u7b49\uff1b\u4f7f\u7528\u8fed\u4ee3\u5668\u6765\u5faa\u73af\u96c6\u5408\uff1b\u4f7f\u7528\u96c6\u5408\u7684\u65f6\u5019\u4f7f\u7528\u6cdb\u578b\u3002\n<\/p>\n
\n\t\"\u7a0b\u5e8f\u5458\u4e2a\u4eba\u7b80\u5386\"\n<\/p>\n
\n\t\u4eca\u5929\u6211\u4eec\u5c31\u5148\u5230\u8fd9\u91cc\u5427\uff0c\u540e\u9762\u6211\u4eec\u518d\u52a0\u5165\u9ad8\u96be\u5ea6\u7684\u9762\u8bd5\u9898\uff01\u4e0a\u9762\u8fd9\u4e2a\u4e2a\u4eba\u7b80\u5386\uff0c\u4f60\u4eec\u770b\u4e00\u4e0b\u5427\uff01\u6709\u4f55\u611f\u60f3\uff1f<\/p>\n
\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/<\/p>
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\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a\u4e1a\u4f59\u8349<\/a>\uff1a » \u5206\u4eab\u51e0\u4e2a\u4f60\u53ef\u80fd\u5ffd\u89c6\u7684 java \u9762\u8bd5\u9898<\/a><\/p>","protected":false},"excerpt":{"rendered":"
3\u30014 \u6708\u4efd\u662f\u9762\u8bd5\u7684\u9ec4\u91d1\u5b63\uff0c\u6700\u8fd1\u4e0d\u7ba1\u662f\u77e5\u4e4e\u8fd8\u662f\u5fae\u4fe1\u91cc\uff0c\u90fd\u6709\u4e0d\u662f\u4eba\u5728\u95ee\u6211\u8981\u8d44\u6599\uff0c\u4e5f\u6216\u8005\u662f\u8ba9\u6211\u4e0b\u8f7d\u4e00\u4e9b\u9762\u8bd5\u8d44\u6599\u3002  […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[69,565,261,579,410],"class_list":["post-3971","post","type-post","status-publish","format-standard","hentry","category-java","tag-java","tag-java-","tag-579","tag-410"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/3971","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3971"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/3971\/revisions"}],"predecessor-version":[{"id":3972,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/3971\/revisions\/3972"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3971"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3971"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3971"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}