{"id":4334,"date":"2019-06-14T18:22:15","date_gmt":"2019-06-14T10:22:15","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=4334"},"modified":"2019-06-14T18:22:15","modified_gmt":"2019-06-14T10:22:15","slug":"%e7%81%ad%e9%9c%b8%e6%89%80%e6%9c%89%e5%8d%95%e4%be%8b%e6%a8%a1%e5%bc%8f%ef%bc%8c%e5%85%8b%e9%9a%86%e3%80%81%e5%ba%8f%e5%88%97%e5%8c%96%e3%80%81%e5%8f%8d%e5%b0%84%e6%9c%ba%e5%88%b6%e7%a0%b4%e5%9d%8f7","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4334","title":{"rendered":"\u706d\u9738\u6240\u6709\u5355\u4f8b\u6a21\u5f0f\uff0c\u514b\u9686\u3001\u5e8f\u5217\u5316\u3001\u53cd\u5c04\u673a\u5236\u7834\u574f7\u79cd\u5355\u4f8b\u6a21\u5f0f"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5355\u4f8b\u6a21\u5f0f\u5b9e\u9645\u4e0a\u4e5f\u4e0d\u6b62 7 \u79cd\u3002\u4f46\u662f\uff0c\u6bcf\u4e00\u79cd\u90fd\u5e76\u975e\u5b89\u5168\u7684\u3002\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u8bb2\u4e00\u8bb2\u5982\u4f55\u5229\u7528\u514b\u9686\u3001\u5e8f\u5217\u5316\u3001\u53cd\u5c04\u673a\u5236\u7834\u574f\u5355\u4f8b\u6a21\u5f0f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eca\u5929\u4ee5\u75f4\u6c49\u5f0f\u5355\u4f8b\u4e3a\u4f8b\u6765\u8bb2\uff0c\u5176\u4ed6\u7684\u5355\u4f8b\u6a21\u5f0f\u7834\u574f\u65b9\u5f0f\u7c7b\u4f3c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Singleton {\n    private static volatile Singleton singleton;\n    private Singleton() {}\n    public static Singleton getInstance(){\n        if (singleton == null){\n            synchronized (Singleton.class){\n                if (singleton == null){\n                    singleton = new Singleton();\n                }\n            }\n        }\n        return singleton;\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u9762\u8fd9\u4e2a\u5355\u4f8b\u5b9e\u73b0\uff0c\u770b\u4f3c\u5f88\u5b8c\u7f8e\u3002\u4f46\u6211\u4eec\u901a\u8fc7\u514b\u9686\u3001\u5e8f\u5217\u5316\u3001\u53cd\u5c04\u673a\u5236\uff0c\u6765\u51fb\u7834\u8fd9\u4e2a\u5355\u4f8b\u6a21\u5f0f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u521b\u5efa\u4e00\u4e2a Java \u5bf9\u8c61\u4e00\u822c\u6709 4 \u79cd\u65b9\u5f0f\uff1anew \u3001\u514b\u9686\u3001\u5e8f\u5217\u5316\u3001\u53cd\u5c04\uff01\u73b0\u5728 new \u8fd9\u79cd\u65b9\u5f0f\u4e0d\u80fd\u4f7f\u7528\u4e86\uff0c\u90a3\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5269\u4e0b\u7684 3 \u79cd\u65b9\u5f0f\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u6765\u770b\u514b\u9686\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9e\u73b0 Cloneable \u63a5\u53e3\uff0c\u5c3d\u7ba1\u6784\u9020\u51fd\u6570\u662f\u79c1\u6709\uff0c\u4f46\u8fd8\u4f1a\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u3002\u56e0\u4e3a clone \u65b9\u6cd5\u4e0d\u4f1a\u8c03\u7528\u6784\u9020\u51fd\u6570\uff0c\u4f1a\u76f4\u63a5\u4ece\u5185\u5b58\u4e2d copy \u5185\u5b58\u533a\u57df\u3002\u6240\u4ee5\u5355\u4f8b\u6a21\u5f0f\u7684\u7c7b\u662f\u5207\u8bb0\u4e0d\u8981\u5b9e\u73b0 Cloneable \u63a5\u53e3\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public static void main(String[] args) throws CloneNotSupportedException {\n    Singleton singleton = getInstance();\n    Singleton singleton1 = (Singleton) singleton.clone();\n    Singleton singleton2 = getInstance();\n    System.out.println(singleton.hashCode());\n    System.out.println(singleton1.hashCode());\n    System.out.println(singleton2.hashCode());\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u81ea\u5df1\u8fd0\u884c\u4e00\u4e0b\uff0chash \u503c\u4e0d\u4e00\u6837\uff0c\u6240\u4ee5\u514b\u9686\u6210\u529f\u4e86\uff0c\u751f\u6210\u4e86\u4e00\u4e2a\u65b0\u5bf9\u8c61\u3002\u5355\u4f8b\u6a21\u5f0f\u88ab\u6210\u529f\u7834\u574f\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u90a3\u4e48\u600e\u4e48\u62b5\u5236\u88ab\u514b\u9686\u5462\uff1f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n * \u9632\u6b62\u514b\u9686\u653b\u51fb\n * @return\n* @throws CloneNotSupportedException\n *\/\n@Override\nprotected Object clone() throws CloneNotSupportedException {\n    return getInstance();\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c31\u662f\u91cd\u5199 clone \u65b9\u6cd5\uff0c\u8c03\u7528 getInstance() \u65b9\u6cd5\uff0c\u8fd4\u56de\u5df2\u6709\u7684\u5b9e\u4f8b\u5373\u53ef\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u73b0\u5728\u6211\u4eec\u518d\u6765\u770b\u5e8f\u5217\u5316\u662f\u5982\u4f55\u7834\u574f\u5355\u4f8b\u6a21\u5f0f\u7684\u3002\u73b0\u5728\u5047\u8bbe\u4f60\u7684\u5355\u4f8b\u6a21\u5f0f\uff0c\u5b9e\u73b0\u4e86 Serializable \u63a5\u53e3\u3002\u770b\u6211\u4e0b\u9762\u53cd\u5e8f\u5217\u5316\u7684\u6848\u4f8b\uff01<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public static void main(String[] args) throws IOException, ClassNotFoundException {\n    Singleton singleton = getSingleton();\n    ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(\"d:\\\\xttblog.obj\"));\n    oos.writeObject(singleton);\n    ObjectInputStream ois = new ObjectInputStream(new FileInputStream(new File(\"d:\\\\xttblog.obj\")));\n    Singleton singleton1 = (Singleton) ois.readObject();\n    System.out.println(singleton.hashCode());\n    System.out.println(singleton1.hashCode());\n    System.out.println(singleton == singleton1);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6267\u884c\u4e4b\u540e\uff0chash \u503c\u4e0d\u4e00\u6837\u4e86\uff0c\u83b7\u53d6\u7684\u5bf9\u8c61\u975e\u540c\u4e00\u5bf9\u8c61\u3002\u7ed3\u8bba\uff0c\u5355\u4f8b\u6a21\u5f0f\u53c8\u88ab\u7834\u574f\u4e86\uff01\u90a3\u4e48\u600e\u4e48\u9632\u6b62\u88ab\u53cd\u5e8f\u5217\u5316\u5462\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f88\u7b80\u5355\uff0c\u81ea\u5b9a\u4e49\u5b9e\u73b0\u5bf9\u8c61\u7684 readResolve() \u65b9\u6cd5\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>private Object readResolve() {\n    return getSingleton();\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4ec0\u4e48\u5b9e\u73b0\u5bf9\u8c61\u7684 readResolve() \u65b9\u6cd5\u5c31\u53ef\u4ee5\u4e86\u5462\uff1f\u8fd9\u4e2a\u4f60\u53ef\u4ee5\u81ea\u5df1 debug \u4e00\u4e0b\uff0c\u4e0a\u9762\u53cd\u5e8f\u5217\u5316\u7684\u4ee3\u7801\u3002\u5176\u4e2d\u6709\u4e00\u4e2a readOrdinaryObject \u65b9\u6cd5\u5728\u505a\u602a\uff01<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Class&lt;?&gt; cl = desc.forClass();\/\/\u83b7\u53d6SingletonIn\u7684Class\nif (cl == String.class || cl == Class.class\n       || cl == ObjectStreamClass.class) {\n    throw new InvalidClassException(\"invalid class descriptor\");\n}\nObject obj;\ntry {\/\/\u5982\u679c\u6240\u4ee3\u8868\u7684\u7c7b\u662f\u53ef\u5e8f\u5217\u5316\u6216\u8005\u81ea\u5b9a\u4e49\u5e8f\u5217\u5316\u5e76\u4e14\u53ef\u4ee5\u5e8f\u5217\u5316runtime\u65f6\u5019\u88ab\u5b9e\u4f8b\u5316\uff0c\u5219\u8fd4\u56detrue\n    obj = desc.isInstantiable() ? desc.newInstance() : null;\n\/\/debug\u5728\u8fd9\u91cc\u901a\u8fc7\u53cd\u5c04\u521b\u5efa\u4e86\u5bf9\u8c61\n} catch (Exception ex) {\n    \/\/\u7701\u7565\n}\npassHandle = handles.assign(unshared ? unsharedMarker : obj);\nClassNotFoundException resolveEx = desc.getResolveException();\nif (resolveEx != null) {\n    handles.markException(passHandle, resolveEx);\n}\n\/\/\u662f\u5426\u5b9e\u73b0\u4e86\u81ea\u5b9a\u4e49\u5e8f\u5217\u5316\u63a5\u53e3\nif (desc.isExternalizable()) {\n    readExternalData((Externalizable) obj, desc);\n} else {\n    readSerialData(obj, desc);\/\/\u8bfb\u53d6\u6301\u4e45\u5316\u7684\u6570\u636e\u5e76\u5199\u5165\u5bf9\u8c61\n}\nhandles.finish(passHandle);\nif (obj != null &amp; handles.lookupException(passHandle) == null &amp;&amp;\n    desc.hasReadResolveMethod())\n\/\/\u5982\u679c\u6240\u4ee3\u8868\u5bf9\u8c61\u5b9e\u73b0\u4e86\u53ef\u5e8f\u5217\u5316\u6216\u8005\u81ea\u5b9a\u4e49\u5e8f\u5217\u5316\u63a5\u53e3\uff0c\u5e76\u4e14\u5b9a\u4e49\u4e86readResolve\u65b9\u6cd5\uff0c\u5219\u8fd4\u56detrue\n{\n    \/\/\u83b7\u53d6readResolve\u65b9\u6cd5\u4e2d\u7684\u5bf9\u8c61\uff0c\u5e76\u66ff\u6362obj\n    Object rep = desc.invokeReadResolve(obj);\n    if (unshared &amp;&amp; rep.getClass().isArray()) {\n        rep = cloneArray(rep);\n    }\n    if (rep != obj) {\n        handles.setObject(passHandle, obj = rep);\n    }\n}\nreturn obj;\/\/\u8fd4\u56de\u8fd4\u5e8f\u5217\u5316\u5bf9\u8c61<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5173\u952e\u4ee3\u7801\u90fd\u6ce8\u5c04\u7684\u6bd4\u8f83\u5168\uff0c\u6211\u76f8\u4fe1\u4f60\u80fd\u770b\u660e\u767d\u3002\u5982\u679c\u8fd8\u4e0d\u660e\u767d\uff0c\u52a0\u6211\u5fae\u4fe1ID\uff1axttblog\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\uff0c\u6211\u4eec\u518d\u6765\u770b\u53cd\u5c04\u662f\u5982\u4f55\u7834\u574f\u5355\u4f8b\u6a21\u5f0f\u7684\uff01<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public static void main(String[] args)\n        throws ReflectiveOperationException {\n    Class cls = Singleton.class;\n    Constructor&lt;Singleton&gt; constructor = cls.getDeclaredConstructor();\n    constructor.setAccessible(true);\n    Singleton singleton = constructor.newInstance();\n    Singleton singleton1 = getSingletonIn();\n    System.out.println(singleton.hashCode());\n    System.out.println(singleton1.hashCode());\n    System.out.println(singleton == singleton1);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6267\u884c\u4e4b\u540e\uff0chash \u503c\u4e0d\u4e00\u6837\u4e86\uff0c\u83b7\u53d6\u7684\u5bf9\u8c61\u975e\u540c\u4e00\u5bf9\u8c61\u3002\u7ed3\u8bba\uff0c\u5355\u4f8b\u6a21\u5f0f\u53c8\u88ab\u7834\u574f\u4e86\uff01\u90a3\u4e48\u5982\u4f55\u89e3\u51b3\u5462\uff1f\u5f88\u7b80\u5355\uff0c\u52a0\u5165\u4e0b\u9762\u7684\u4ee3\u7801\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>private Singleton() {\n    if (null != instance) {\n        throw new RuntimeException();\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a\u6267\u884c\u53cd\u5c04\u4f1a\u8c03\u7528\u65e0\u53c2\u6784\u9020\u51fd\u6570\uff0c\u6240\u4ee5\u4e0a\u9762\u7684\u5224\u65ad\u5c31\u53ef\u4ee5\u8d77\u4f5c\u7528\u4e86\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7efc\u4e0a\u6240\u8ff0\uff0c\u5355\u4f8b\u6a21\u5f0f\u9700\u8981\u8003\u8651\uff0c\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\uff0c\u6548\u7387\u95ee\u9898\uff0c\u9632\u6b62\u53cd\u5c04\u3001\u53cd\u5e8f\u5217\u5316\u3001\u514b\u9686\u3002\u8981\u4e0d\u7136\uff0c\u5c31\u6709\u53ef\u80fd\u88ab\u9ed1\u5ba2\u5229\u7528\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u770b\u5230\u8fd9\u91cc\uff0c\u6709\u4e9b\u4eba\u53ef\u80fd\u4f1a\u95ee\uff0c\u8fd9\u4e5f\u592a\u9ebb\u70e6\u4e86\uff0c\u6709\u6ca1\u6709\u66f4\u7b80\u4fbf\u7684\u65b9\u6cd5\u5462\uff1f\u6709\uff0c\u679a\u4e3e\u6a21\u5f0f\u3002\u679a\u4e3e\u7c7b\u578b\u662f\u7edd\u5bf9\u5355\u4f8b\u7684\uff0c\u53ef\u4ee5\u65e0\u8d23\u4efb\u4f7f\u7528\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public enum Singleton implements Cloneable, Serializable{\n    Instance;\n    private Singleton() {\n        init();\n    }\n    public void init() {\n        \/\/\u7701\u7565\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u679a\u4e3e\uff0c\u5c31\u7b97\u5b9e\u73b0\u53cc\u63a5\u53e3\uff0c\u4e5f\u662f\u65e0\u8bba\u5982\u4f55\u90fd\u65e0\u6cd5\u88ab\u7834\u574f\u7684\u3002\u679a\u4e3e\u65e0\u6cd5\u514b\u9686\uff0c\u6ca1\u6709\u8fd9\u6837\u7684\u65b9\u6cd5\u3002\u6ca1\u6709\u6784\u9020\u51fd\u6570\uff0c\u4f1a\u629b\u51fa\u5f02\u5e38\u3002\u5c31\u7b97\u4f60\u5728\u679a\u4e3e\u91cc\u52a0\u4e86\u6784\u9020\u51fd\u6570\uff0c\u4e5f\u662f\u4e00\u6837\u7684\u3002\u5bf9\u4e8e\u53cd\u5e8f\u5217\u5316 Java \u4ec5\u4ec5\u662f\u5c06\u679a\u4e3e\u5bf9\u8c61\u7684 name \u5c5e\u6027\u8f93\u51fa\u5230\u7ed3\u679c\u4e2d\uff0c\u53cd\u5e8f\u5217\u5316\u7684\u65f6\u5019\u5219\u662f\u901a\u8fc7 java.lang.Enum \u7684 valueOf \u65b9\u6cd5\u6765\u6839\u636e\u540d\u5b57\u67e5\u627e\u679a\u4e3e\u5bf9\u8c61\u3002\u540c\u65f6\uff0c\u7f16\u8bd1\u5668\u662f\u4e0d\u5141\u8bb8\u4efb\u4f55\u5bf9\u8fd9\u79cd\u5e8f\u5217\u5316\u673a\u5236\u7684\u5b9a\u5236\u7684\uff0c\u56e0\u6b64\u7981\u7528\u4e86 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alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a 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