{"id":202734,"date":"2025-05-22T10:59:32","date_gmt":"2025-05-22T02:59:32","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202734\/"},"modified":"2025-05-22T10:59:32","modified_gmt":"2025-05-22T02:59:32","slug":"%e5%a4%9a%e7%ba%bf%e7%a8%8b%e7%8e%af%e5%a2%83%e4%b8%8b-java-%e5%87%bd%e6%95%b0%e5%a4%b1%e6%95%88%e4%b8%8e%e6%95%b0%e6%8d%ae%e5%8f%af%e8%a7%81%e6%80%a7%e5%92%8c%e4%b8%80%e8%87%b4%e6%80%a7%e9%97%ae","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202734\/","title":{"rendered":"\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548\u4e0e\u6570\u636e\u53ef\u89c1\u6027\u548c\u4e00\u81f4\u6027\u95ee\u9898\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548\u4e0e\u6570\u636e\u53ef\u89c1\u6027\u548c\u4e00\u81f4\u6027\u95ee\u9898\uff1f<\/h1>\n<p>\u7f16\u7a0b\u5e76\u4e0d\u662f\u4e00\u4e2a\u673a\u68b0\u6027\u7684\u5de5\u4f5c\uff0c\u800c\u662f\u9700\u8981\u6709\u601d\u8003\uff0c\u6709\u521b\u65b0\u7684\u5de5\u4f5c\uff0c\u8bed\u6cd5\u662f\u56fa\u5b9a\u7684\uff0c\u4f46\u89e3\u51b3\u95ee\u9898\u7684\u601d\u8def\u5219\u662f\u4f9d\u9760\u4eba\u7684\u601d\u7ef4\uff0c\u8fd9\u5c31\u9700\u8981\u6211\u4eec\u575a\u6301\u5b66\u4e60\u548c\u66f4\u65b0\u81ea\u5df1\u7684\u77e5\u8bc6\u3002\u4eca\u5929\u5c31\u6574\u7406\u5206\u4eab\u300a\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548\u4e0e\u6570\u636e\u53ef\u89c1\u6027\u548c\u4e00\u81f4\u6027\u95ee\u9898\uff1f\u300b\uff0c\u6587\u7ae0\u8bb2\u89e3\u7684\u77e5\u8bc6\u70b9\u4e3b\u8981\u5305\u62ec\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\uff0c\u5728\u8fd9\u53ef\u4ee5\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5f00\u53d1\u80fd\u529b\u7684\u63d0\u5347\u3002<\/p>\n<p>\u591a\u7ebf\u7a0b\u7f16\u7a0b\u4e2d\u51fd\u6570\u5931\u6548\u4e0e\u6570\u636e\u53ef\u89c1\u6027\u548c\u4e00\u81f4\u6027\u95ee\u9898\u53ef\u901a\u8fc7\u4ee5\u4e0b\u89e3\u51b3\u65b9\u6848\u89e3\u51b3\uff1a\u6570\u636e\u53ef\u89c1\u6027\uff1a\u4f7f\u7528 synchronized \u6216 volatile \u786e\u4fdd\u7ebf\u7a0b\u95f4\u5171\u4eab\u53d8\u91cf\u53ef\u89c1\u3002\u6570\u636e\u4e00\u81f4\u6027\uff1a\u4f7f\u7528\u539f\u5b50\u53d8\u91cf\u6216\u9501\u9632\u6b62\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u4fee\u6539\u5171\u4eab\u53d8\u91cf\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729937548671cc08ced477.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548\u4e0e\u6570\u636e\u53ef\u89c1\u6027\u548c\u4e00\u81f4\u6027\u95ee\u9898<\/strong><\/p>\n<p><strong>\u5f15\u8a00<\/strong><\/p>\n<p>\u5728\u591a\u7ebf\u7a0b\u7f16\u7a0b\u4e2d\uff0c\u5982\u679c\u7ebf\u7a0b\u4e0d\u5bf9\u5171\u4eab\u8d44\u6e90\u8fdb\u884c\u540c\u6b65\u64cd\u4f5c\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u51fd\u6570\u5931\u6548\u3001\u6570\u636e\u53ef\u89c1\u6027\u548c\u4e00\u81f4\u6027\u95ee\u9898\u3002\u672c\u6587\u5c06\u63a2\u8ba8 Java \u4e2d\u7684 these \u95ee\u9898\uff0c\u5e76\u63d0\u4f9b\u5b9e\u6218\u6848\u4f8b\u4ee5\u8bf4\u660e\u5982\u4f55\u89e3\u51b3\u5b83\u4eec\u3002<\/p>\n<p><strong>\u6570\u636e\u53ef\u89c1\u6027<\/strong><\/p>\n<p>\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\uff0c\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u4fee\u6539\u5171\u4eab\u53d8\u91cf\u65f6\uff0c\u5176\u4ed6\u7ebf\u7a0b\u53ef\u80fd\u65e0\u6cd5\u7acb\u5373\u770b\u5230\u8fd9\u4e9b\u66f4\u6539\u3002\u8fd9\u662f\u56e0\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u81ea\u5df1\u7684\u672c\u5730\u5185\u5b58\uff0c\u5176\u4e2d\u5b58\u50a8\u4e86\u5bf9\u5171\u4eab\u53d8\u91cf\u7684\u526f\u672c\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6848\uff1a<\/strong><\/p>\n<ul>\n<li><strong>\u540c\u6b65\uff1a<\/strong>\u4f7f\u7528 synchronized \u5173\u952e\u5b57\u6216\u9501\u5bf9\u8c61\u4f7f\u7ebf\u7a0b\u5728\u8bbf\u95ee\u5171\u4eab\u53d8\u91cf\u4e4b\u524d\u5fc5\u987b\u83b7\u53d6\u9501\u3002<\/li>\n<li><strong>volatile\uff1a<\/strong>\u5c06\u53d8\u91cf\u58f0\u660e\u4e3a volatile\uff0c\u8fd9\u6837\u5b83\u5c06\u5728\u6240\u6709\u7ebf\u7a0b\u4e4b\u95f4\u4fdd\u6301\u53ef\u89c1\u3002<\/li>\n<\/ul>\n<p><strong>\u6570\u636e\u4e00\u81f4\u6027<\/strong><\/p>\n<p>\u6570\u636e\u4e00\u81f4\u6027\u662f\u6307\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u4fdd\u6301\u5171\u4eab\u53d8\u91cf\u5185\u5bb9\u7684\u6b63\u786e\u6027\u3002\u5f53\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u4fee\u6539\u5171\u4eab\u53d8\u91cf\u65f6\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e0d\u4e00\u81f4\u7684\u6570\u636e\u72b6\u6001\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6848\uff1a<\/strong><\/p>\n<ul>\n<li><strong>\u539f\u5b50\u6027\uff1a<\/strong>\u4f7f\u7528\u539f\u5b50\u53d8\u91cf\u6216\u539f\u5b50\u64cd\u4f5c\uff0c\u786e\u4fdd\u4e00\u6b21\u53ea\u80fd\u4fee\u6539\u5171\u4eab\u53d8\u91cf\u7684\u4e00\u4e2a\u503c\u3002<\/li>\n<li><strong>\u9501\uff1a<\/strong>\u4f7f\u7528\u9501\u5bf9\u8c61\u6216\u540c\u6b65\u673a\u5236\u9632\u6b62\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u4fee\u6539\u5171\u4eab\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<p>\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\u793a\u4f8b\uff0c\u5b83\u5728\u4e24\u4e2a\u7ebf\u7a0b\u4e2d\u5171\u4eab\u4e00\u4e2a\u8ba1\u6570\u5668\u5bf9\u8c61\uff1a<\/p>\n<pre>public class Counter {\n    private int count = 0;\n\n    public synchronized void increment() {\n        count++;\n    }\n\n    public int getCount() {\n        return count;\n    }\n}\n\npublic class Main {\n    public static void main(String[] args) {\n        Counter counter = new Counter();\n\n        Thread thread1 = new Thread(() -&gt; {\n            for (int i = 0; i &lt; 10000; i++) {\n                counter.increment();\n            }\n        });\n\n        Thread thread2 = new Thread(() -&gt; {\n            for (int i = 0; i &lt; 10000; i++) {\n                counter.increment();\n            }\n        });\n\n        thread1.start();\n        thread2.start();\n\n        thread1.join();\n        thread2.join();\n\n        System.out.println(counter.getCount()); \/\/ \u53ef\u80fd\u8f93\u51fa\u5c0f\u4e8e 20000\n    }\n}<\/pre>\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u5982\u679c\u4e0d\u4f7f\u7528\u540c\u6b65\u673a\u5236\uff0c\u4e24\u4e2a\u7ebf\u7a0b\u5c06\u540c\u65f6\u4fee\u6539 count \u53d8\u91cf\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u3002\u4f7f\u7528 synchronized \u5173\u952e\u5b57\u5bf9 increment() \u65b9\u6cd5\u8fdb\u884c\u540c\u6b65\u53ef\u4ee5\u4fdd\u8bc1\u4e00\u6b21\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u5171\u4eab\u53d8\u91cf\uff0c\u4ece\u800c\u907f\u514d\u4e86\u6570\u636e\u4e00\u81f4\u6027\u95ee\u9898\u3002<\/p>\n<p>\u8fd0\u884c\u6b64\u4ee3\u7801\u4f1a\u8f93\u51fa 20000\uff0c\u56e0\u4e3a\u8fd9\u4e24\u4e2a\u7ebf\u7a0b\u5728\u4fee\u6539\u5171\u4eab\u53d8\u91cf\u65f6\u8fdb\u884c\u4e86\u540c\u6b65\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300a\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548\u4e0e\u6570\u636e\u53ef\u89c1\u6027\u548c\u4e00\u81f4\u6027\u95ee\u9898\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8ejava,\u591a\u7ebf\u7a0b\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202734","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202734","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202734"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202734\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}