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public class Singleton {\n private static Singleton uniqueInstance;\n\n private Singleton() {}\n\n public static Singleton getInstance() {\n if (uniqueInstance == null) {\n uniqueInstance = new Singleton();\n }\n return uniqueInstance;\n }\n}<\/code><\/pre>\n\n\n\n\u4e0a\u9762\u7684\u5355\u4f8b\u6a21\u5f0f\u8c8c\u4f3c\u6ca1\u6709\u4ec0\u4e48\u95ee\u9898\uff0c\u4f46\u662f\u5728\u591a\u7ebf\u7a0b\u4e2d\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u521b\u5efa\u5355\u4f8b\u7684\u60c5\u51b5\uff0c\u8fd9\u65f6\u5019\u4ee5\u4e0a\u4ee3\u7801\u6ca1\u6709\u591a\u7ebf\u7a0b\u7ba1\u63a7\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u521b\u5efa\u591a\u4e2a\u5b9e\u4f8b\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n
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public class Singleton {\n private static Singleton uniqueInstance;\n\n private Singleton() {}\n\n public static synchronized Singleton getInstance() {\n if (uniqueInstance == null) {\n uniqueInstance = new Singleton();\n }\n return uniqueInstance;\n }\n}<\/code><\/pre>\n\n\n\n\u5982\u679c\u5355\u4f8b\u83b7\u53d6\u4e0d\u662f\u5f88\u9891\u7e41\uff0c\u90a3\u5f53\u524d\u5355\u4f8b\u6a21\u5f0f\u4ee3\u7801\u5c31\u80fd\u5e94\u4ed8\u9700\u6c42\u3002\u4f46\u662f\u5982\u679c\u5355\u4f8b\u83b7\u53d6\u5f97\u5f88\u9891\u7e41\uff0c\u8fd9\u5c31\u9700\u8981\u8003\u8651\u540c\u6b65\u5e26\u6765\u7684\u6548\u7387\u964d\u4f4e\u95ee\u9898\u3002\u56e0\u4e3a\u6bcf\u4e2a\u9700\u8981\u83b7\u53d6\u5355\u4f8b\u7684\u7ebf\u7a0b\u90fd\u5fc5\u987b\u6392\u961f\u6765\u7b49\u5f85\u83b7\u53d6\u5355\u5b9e\u4f8b\uff0c\u6240\u4ee5\u5728\u83b7\u53d6\u5355\u4f8b\u65f6\u53ef\u80fd\u4f1a\u51fa\u73b0\u5361\u987f\uff0c\u54cd\u5e94\u6162\u7b49\u95ee\u9898\u3002\u6240\u4ee5\u5728\u9891\u7e41\u83b7\u53d6\u5355\u4f8b\uff0c\u4e14\u662f\u591a\u7ebf\u7a0b\u573a\u666f\u65f6\uff0c\u6211\u4eec\u5e94\u8be5\u5982\u4f55\u8fdb\u884c\u6539\u5584\uff1f<\/p>\n\n\n\n
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public class Singleton {\n private static Singleton uniqueInstance = new Singleton();\n\n private Singleton() {}\n\n public static Singleton getInstance() {\n return uniqueInstance;\n }\n}<\/code><\/pre>\n\n\n\n\u65b9\u6cd5\u4e8c\uff1a\u53cc\u91cd\u68c0\u67e5\u9501<\/p>\n\n\n\n
public class Singleton {\n private volatile static Singleton uniqueInstance;\n\n private Singleton() {}\n\n public static Singleton getInstance() {\n if (uniqueInstance == null) {\n synchronized (Singleton.class) {\n if (uniqueInstance == null) {\n uniqueInstance = new Singleton();\n }\n }\n }\n return uniqueInstance;\n }\n}<\/code><\/pre>\n\n\n\n\u8fd9\u91cc\u4f7f\u7528\u7684\u662f\u540c\u6b65\u53d8\u91cf\uff0c\u800c\u4e0d\u662f\u540c\u6b65\u65b9\u6cd5\uff0c\u540c\u6b65\u5757\u5185\u90e8\u7684\u8fd8\u8fdb\u884c\u4e00\u6b21\u5224\u65ad\u662f\u56e0\u4e3a\u53d8\u91cf\u7684\u521d\u59cb\u5316\u5e76\u4e0d\u662f\u539f\u5b50\u64cd\u4f5c\uff0c\u4f1a\u5206\u4e3a\u5206\u914d\u6808\u7a7a\u95f4\u548c\u521d\u59cb\u5316\u4e24\u4e2a\u8fc7\u7a0b\uff0c\u5206\u914d\u6808\u7a7a\u95f4\u540e\u53d8\u91cf\u5c31\u4e0d\u662fnull\u4e86\uff0c\u4f46\u8fd9\u65f6\u5019\u7684\u5b50\u8282\u7801\u662f\u4e4b\u524d\u5185\u5b58\u5b58\u5165\u7684\u5b50\u8282\u6570\u636e\uff0c\u6240\u4ee5\u4f1a\u4e0d\u4f1a\u6267\u884c\u540c\u6b65\u5757\u5185\u90e8if\u8bed\u53e5\u7684\u4ee3\u7801\uff0c\u8fd9\u624d\u80fd\u540c\u6b65\u5355\u4f8b\u521b\u5efa\u7684\u8fc7\u7a0b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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