{"id":203793,"date":"2025-05-22T10:55:41","date_gmt":"2025-05-22T02:55:41","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203793\/"},"modified":"2025-05-22T10:55:41","modified_gmt":"2025-05-22T02:55:41","slug":"%e5%a4%9a%e7%ba%bf%e7%a8%8b%e7%bc%96%e7%a8%8b%e4%b8%ad%ef%bc%8c%e4%b8%bb%e7%ba%bf%e7%a8%8b%e5%a6%82%e4%bd%95%e8%ae%bf%e9%97%ae%e5%ad%90%e7%ba%bf%e7%a8%8b%e4%bf%ae%e6%94%b9%e7%9a%84%e5%8f%98%e9%87%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203793\/","title":{"rendered":"\u591a\u7ebf\u7a0b\u7f16\u7a0b\u4e2d\uff0c\u4e3b\u7ebf\u7a0b\u5982\u4f55\u8bbf\u95ee\u5b50\u7ebf\u7a0b\u4fee\u6539\u7684\u53d8\u91cf\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u591a\u7ebf\u7a0b\u7f16\u7a0b\u4e2d\uff0c\u4e3b\u7ebf\u7a0b\u5982\u4f55\u8bbf\u95ee\u5b50\u7ebf\u7a0b\u4fee\u6539\u7684\u53d8\u91cf\uff1f<\/h1>\n

\u6b22\u8fce\u5404\u4f4d\u5c0f\u4f19\u4f34\u6765\u5230\uff0c\u76f8\u805a\u4e8e\u6b64\u90fd\u662f\u7f18\u54c8\u54c8\u54c8\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u300a\u591a\u7ebf\u7a0b\u7f16\u7a0b\u4e2d\uff0c\u4e3b\u7ebf\u7a0b\u5982\u4f55\u8bbf\u95ee\u5b50\u7ebf\u7a0b\u4fee\u6539\u7684\u53d8\u91cf\uff1f\u300b<\/span>\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\u975e\u5e38\u611f\u5174\u8da3\u6216\u8005\u6b63\u5728\u81ea\u5b66\uff0c\u90fd\u53ef\u4ee5\u5173\u6ce8\u6211\uff0c\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\uff01\u5f53\u7136\uff0c\u6709\u4ec0\u4e48\u5efa\u8bae\u4e5f\u6b22\u8fce\u5728\u8bc4\u8bba\u7559\u8a00\u63d0\u51fa\uff01\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

<\/p>\n

\u4e3b\u7ebf\u7a0b\u4e2d\u83b7\u53d6\u7ebf\u7a0b\u5185\u4fee\u6539\u7684\u503c<\/strong><\/p>\n

\u5728\u591a\u7ebf\u7a0b\u7f16\u7a0b\u4e2d\uff0c\u5f53\u5728\u5b50\u7ebf\u7a0b\u5185\u4fee\u6539\u53d8\u91cf\u503c\u65f6\uff0c\u4e3b\u7ebf\u7a0b\u53ef\u80fd\u65e0\u6cd5\u8bbf\u95ee\u5230\u4fee\u6539\u540e\u7684\u503c\uff0c\u8fd9\u662f\u7531\u4e8e java \u5185\u5b58\u6a21\u578b\u4e2d\u5b58\u5728\u53ef\u89c1\u6027\u95ee\u9898\u3002<\/p>\n

\u95ee\u9898\u63cf\u8ff0<\/strong><\/p>\n

\u4ee5\u4e0b\u662f\u53d1\u751f\u8be5\u95ee\u9898\u7684\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n

\/\/ main.java\npublic class main {\n\n    public static void main(string[] args) throws interruptedexception {\n        \/\/ \u5728\u4e3b\u7ebf\u7a0b\u4e2d\u521b\u5efa\u4e00\u4e2a\u503c\u5bf9\u8c61 va\n        values va = new values();\n        va.seta(2);\n        system.out.println(\"=======1=========\");\n        system.out.println(\"main:\" + va.geta());\n\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u65b0\u7ebf\u7a0b\n        threademo td = new threademo();\n        td.start();\n        td.join();\n\n        \/\/ \u95ee\u9898\u4ee3\u7801\uff1a\n        system.out.println(\"=======3=========\");\n        system.out.println(\"mainthread:\" + va.geta());\n    }\n}<\/pre>\n
\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u503c\u5bf9\u8c61 va\uff0c\u5e76\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u5c06\u5176\u503c\u8bbe\u7f6e\u4e3a 2\u3002\u7136\u540e\u521b\u5efa\u4e00\u4e2a\u65b0\u7ebf\u7a0b td \u5e76\u542f\u52a8\u5b83\u3002\u5728\u8be5\u7ebf\u7a0b\u4e2d\uff0c\u6211\u4eec\u540c\u6837\u8bbf\u95ee\u53d8\u91cf va\uff0c\u4f46\u6ca1\u6709\u4fee\u6539\u5b83\u7684\u503c\u3002\u6700\u540e\uff0c\u6211\u4eec\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u518d\u6b21\u6253\u5370 va.geta()\uff0c\u4f46\u7ed3\u679c\u4ecd\u7136\u662f 2\uff0c\u800c\u4e0d\u662f\u7ebf\u7a0b\u4e2d\u4fee\u6539\u540e\u7684\u503c\u3002<\/p>\n
\u95ee\u9898\u539f\u56e0<\/strong><\/p>\n
\u8fd9\u662f\u56e0\u4e3a\u5728 java \u5185\u5b58\u6a21\u578b\u4e2d\uff0c\u7ebf\u7a0b\u5bf9\u5171\u4eab\u53d8\u91cf\u7684\u4fee\u6539\u4e0d\u662f\u7acb\u523b\u53ef\u89c1\u7684\u3002\u4e3a\u4e86\u89e3\u51b3\u53ef\u89c1\u6027\u95ee\u9898\uff0cjava \u63d0\u4f9b\u4e86\u540c\u6b65\u673a\u5236\uff0c\u5982 synchronized \u548c volatile \u5173\u952e\u5b57\uff0c\u786e\u4fdd\u5171\u4eab\u53d8\u91cf\u7684\u4fee\u6539\u5728\u6240\u6709\u7ebf\u7a0b\u4e2d\u53ef\u89c1\u3002<\/p>\n
\u89e3\u51b3\u65b9\u6848<\/strong><\/p>\n
\u8981\u89e3\u51b3\u8be5\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u5728 threademo \u7ebf\u7a0b\u4e2d\u4f7f\u7528 synchronized \u5757\u6216\u58f0\u660e va \u4e3a volatile \u53d8\u91cf\uff0c\u4ee5\u786e\u4fdd\u5728\u6240\u6709\u7ebf\u7a0b\u4e2d\u90fd\u53ef\u4ee5\u770b\u5230\u5b83\u7684\u4fee\u6539\u3002<\/p>\n
\u4fee\u6539\u540e\u7684\u7ebf\u7a0b\u4ee3\u7801\uff1a<\/strong><\/p>\n
\/\/ threademo.java\npublic class threademo extends thread {\n\n    \/\/ \u5728\u5171\u4eab\u53d8\u91cf\u4e2d\u4f7f\u7528 synchronized \u5757\n    @override\n    public void run() {\n        \/\/ \u540c\u6b65\u5757\u786e\u4fdd\u7ebf\u7a0b\u4e2d\u7684\u4fee\u6539\u5bf9\u4e8e\u6240\u6709\u7ebf\u7a0b\u90fd\u662f\u53ef\u89c1\u7684\n        synchronized (values.va) {\n            va.seta(10);\n        }\n    }\n}<\/pre>\n
\u4fee\u6539\u540e\u7684\u4e3b\u7ebf\u7a0b\u4ee3\u7801\uff1a<\/strong><\/p>\n
\/\/ main.java\npublic class main {\n\n    public static void main(String[] args) throws InterruptedException {\n        \/\/ \u5728\u5171\u4eab\u53d8\u91cf\u4e0a\u4f7f\u7528 synchronized \u5757\n        synchronized (values.va) {\n            va.setA(2);\n        }\n        System.out.println(\"=======1=========\");\n        System.out.println(\"main:\" + va.getA());\n\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u65b0\u7ebf\u7a0b\n        threademo td = new threademo();\n        td.start();\n        td.join();\n\n        System.out.println(\"=======3=========\");\n        System.out.println(\"mainThread:\" + va.getA());\n    }\n}<\/pre>\n
\u603b\u7ed3<\/strong><\/p>\n
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