{"id":10006135,"date":"2022-08-08T19:23:59","date_gmt":"2022-08-08T11:23:59","guid":{"rendered":"https:\/\/ityet.com\/?p=10006135"},"modified":"2022-08-08T19:23:59","modified_gmt":"2022-08-08T11:23:59","slug":"%e5%bd%bb%e5%ba%95%e7%90%86%e8%a7%a3-volatile-%e5%85%b3%e9%94%ae%e5%ad%97%e5%8f%8a%e5%ba%94%e7%94%a8%e5%9c%ba%e6%99%af%ef%bc%8c%e9%9d%a2%e8%af%95%e5%bf%85%e9%97%ae%ef%bc%8c%e5%b0%8f%e7%99%bd%e9%83%bd","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006135","title":{"rendered":"\u5f7b\u5e95\u7406\u89e3 volatile \u5173\u952e\u5b57\u53ca\u5e94\u7528\u573a\u666f\uff0c\u9762\u8bd5\u5fc5\u95ee\uff0c\u5c0f\u767d\u90fd\u80fd\u770b\u61c2\uff01"},"content":{"rendered":"<p>\u6765\u6e90: blog.csdn.net\/fumitzuki\/article\/details\/81630048<\/p>\n<p>volatile\u5173\u952e\u5b57\u662f\u7531JVM\u63d0\u4f9b\u7684\u6700\u8f7b\u91cf\u7ea7\u540c\u6b65\u673a\u5236\u3002\u4e0e\u88ab\u6ee5\u7528\u7684synchronized\u4e0d\u540c\uff0c\u6211\u4eec\u5e76\u4e0d\u4e60\u60ef\u4f7f\u7528\u5b83\u3002\u60f3\u8981\u6b63\u786e\u4e14\u5b8c\u5168\u7684\u7406\u89e3\u5b83\u5e76\u4e0d\u5bb9\u6613\u3002<\/p>\n<h2>Part1Java\u5185\u5b58\u6a21\u578b<\/h2>\n<p>Java\u5185\u5b58\u6a21\u578b\u7531Java\u865a\u62df\u673a\u89c4\u8303\u5b9a\u4e49\uff0c\u7528\u6765\u5c4f\u853d\u5404\u4e2a\u5e73\u53f0\u7684\u786c\u4ef6\u5dee\u5f02\u3002\u7b80\u5355\u6765\u8bf4:<\/p>\n<ul>\n<li>\u6240\u6709\u53d8\u91cf\u50a8\u5b58\u5728\u4e3b\u5185\u5b58\u3002<\/li>\n<li>\u6bcf\u6761\u7ebf\u7a0b\u62e5\u6709\u81ea\u5df1\u7684\u5de5\u4f5c\u5185\u5b58\uff0c\u5176\u4e2d\u4fdd\u5b58\u4e86\u4e3b\u5185\u5b58\u4e2d\u7ebf\u7a0b\u4f7f\u7528\u5230\u7684\u53d8\u91cf\u7684\u526f\u672c\u3002<\/li>\n<li>\u7ebf\u7a0b\u4e0d\u80fd\u76f4\u63a5\u8bfb\u5199\u4e3b\u5185\u5b58\u4e2d\u7684\u53d8\u91cf\uff0c\u6240\u6709\u64cd\u4f5c\u5747\u5728\u5de5\u4f5c\u5185\u5b58\u4e2d\u5b8c\u6210\u3002\u7ebf\u7a0b\uff0c\u4e3b\u5185\u5b58\uff0c\u5de5\u4f5c\u5185\u5b58\u7684\u4ea4\u4e92\u5173\u7cfb\u5982\u56fe\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc1Arz\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u5185\u5b58\u95f4\u7684\u4ea4\u4e92\u64cd\u4f5c\u6709\u5f88\u591a\uff0c\u548cvolatile\u6709\u5173\u7684\u64cd\u4f5c\u4e3a\uff1a<\/p>\n<blockquote>\n<ul>\n<li>read\uff08\u8bfb\u53d6\uff09\uff1a\u4f5c\u7528\u4e8e\u4e3b\u5185\u5b58\u53d8\u91cf\uff0c\u628a\u4e00\u4e2a\u53d8\u91cf\u503c\u4ece\u4e3b\u5185\u5b58\u4f20\u8f93\u5230\u7ebf\u7a0b\u7684\u5de5\u4f5c\u5185\u5b58\u4e2d\uff0c\u4ee5\u4fbf\u968f\u540e\u7684load\u52a8\u4f5c\u4f7f\u7528<\/li>\n<li>load\uff08\u8f7d\u5165\uff09\uff1a\u4f5c\u7528\u4e8e\u5de5\u4f5c\u5185\u5b58\u7684\u53d8\u91cf\uff0c\u5b83\u628aread\u64cd\u4f5c\u4ece\u4e3b\u5185\u5b58\u4e2d\u5f97\u5230\u7684\u53d8\u91cf\u503c\u653e\u5165\u5de5\u4f5c\u5185\u5b58\u7684\u53d8\u91cf\u526f\u672c\u4e2d\u3002<\/li>\n<li>use\uff08\u4f7f\u7528\uff09\uff1a\u4f5c\u7528\u4e8e\u5de5\u4f5c\u5185\u5b58\u7684\u53d8\u91cf\uff0c\u628a\u5de5\u4f5c\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u53d8\u91cf\u503c\u4f20\u9012\u7ed9\u6267\u884c\u5f15\u64ce\uff0c\u6bcf\u5f53\u865a\u62df\u673a\u9047\u5230\u4e00\u4e2a\u9700\u8981\u4f7f\u7528\u53d8\u91cf\u7684\u503c\u7684\u5b57\u8282\u7801\u6307\u4ee4\u65f6\u5c06\u4f1a\u6267\u884c\u8fd9\u4e2a\u64cd\u4f5c\u3002<\/li>\n<li>assign\uff08\u8d4b\u503c\uff09\uff1a\u4f5c\u7528\u4e8e\u5de5\u4f5c\u5185\u5b58\u7684\u53d8\u91cf\uff0c\u5b83\u628a\u4e00\u4e2a\u4ece\u6267\u884c\u5f15\u64ce\u63a5\u6536\u5230\u7684\u503c\u8d4b\u503c\u7ed9\u5de5\u4f5c\u5185\u5b58\u7684\u53d8\u91cf\uff0c\u6bcf\u5f53\u865a\u62df\u673a\u9047\u5230\u4e00\u4e2a\u7ed9\u53d8\u91cf\u8d4b\u503c\u7684\u5b57\u8282\u7801\u6307\u4ee4\u65f6\u6267\u884c\u8fd9\u4e2a\u64cd\u4f5c\u3002<\/li>\n<li>store\uff08\u5b58\u50a8\uff09\uff1a\u4f5c\u7528\u4e8e\u5de5\u4f5c\u5185\u5b58\u7684\u53d8\u91cf\uff0c\u628a\u5de5\u4f5c\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u53d8\u91cf\u7684\u503c\u4f20\u9001\u5230\u4e3b\u5185\u5b58\u4e2d\uff0c\u4ee5\u4fbf\u968f\u540e\u7684write\u7684\u64cd\u4f5c\u3002<\/li>\n<li>write\uff08\u5199\u5165\uff09\uff1a\u4f5c\u7528\u4e8e\u4e3b\u5185\u5b58\u7684\u53d8\u91cf\uff0c\u5b83\u628astore\u64cd\u4f5c\u4ece\u5de5\u4f5c\u5185\u5b58\u4e2d\u4e00\u4e2a\u53d8\u91cf\u7684\u503c\u4f20\u9001\u5230\u4e3b\u5185\u5b58\u7684\u53d8\u91cf\u4e2d\u3002<\/li>\n<\/ul>\n<\/blockquote>\n<p>\u5bf9\u88abvolatile\u4fee\u9970\u7684\u53d8\u91cf\u8fdb\u884c\u64cd\u4f5c\u65f6\uff0c\u9700\u8981\u6ee1\u8db3\u4ee5\u4e0b\u89c4\u5219\uff1a<\/p>\n<ul>\n<li>\u89c4\u52191\uff1a\u7ebf\u7a0b\u5bf9\u53d8\u91cf\u6267\u884c\u7684\u524d\u4e00\u4e2a\u52a8\u4f5c\u662fload\u65f6\u624d\u80fd\u6267\u884cuse\uff0c\u53cd\u4e4b\u53ea\u6709\u540e\u4e00\u4e2a\u52a8\u4f5c\u662fuse\u65f6\u624d\u80fd\u6267\u884cload\u3002\u7ebf\u7a0b\u5bf9\u53d8\u91cf\u7684read\uff0cload\uff0cuse\u52a8\u4f5c\u5173\u8054\uff0c\u5fc5\u987b\u8fde\u7eed\u4e00\u8d77\u51fa\u73b0\u3002&#8212;&#8211;\u8fd9\u4fdd\u8bc1\u4e86\u7ebf\u7a0b\u6bcf\u6b21\u4f7f\u7528\u53d8\u91cf\u65f6\u90fd\u9700\u8981\u4ece\u4e3b\u5b58\u62ff\u5230\u6700\u65b0\u7684\u503c\uff0c\u4fdd\u8bc1\u4e86\u5176\u4ed6\u7ebf\u7a0b\u4fee\u6539\u7684\u53d8\u91cf\u672c\u7ebf\u7a0b\u80fd\u770b\u5230\u3002<\/li>\n<li>\u89c4\u52192\uff1a\u7ebf\u7a0b\u5bf9\u53d8\u91cf\u6267\u884c\u7684\u524d\u4e00\u4e2a\u52a8\u4f5c\u662fassign\u65f6\u624d\u80fd\u6267\u884cstore\uff0c\u53cd\u4e4b\u53ea\u6709\u540e\u4e00\u4e2a\u52a8\u4f5c\u662fstore\u65f6\u624d\u80fd\u6267\u884cassign\u3002\u7ebf\u7a0b\u5bf9\u53d8\u91cf\u7684assign\uff0cstore\uff0cwrite\u52a8\u4f5c\u5173\u8054\uff0c\u5fc5\u987b\u8fde\u7eed\u4e00\u8d77\u51fa\u73b0\u3002&#8212;&#8211;\u8fd9\u4fdd\u8bc1\u4e86\u7ebf\u7a0b\u6bcf\u6b21\u4fee\u6539\u53d8\u91cf\u540e\u90fd\u4f1a\u7acb\u5373\u540c\u6b65\u56de\u4e3b\u5185\u5b58\uff0c\u4fdd\u8bc1\u4e86\u672c\u7ebf\u7a0b\u4fee\u6539\u7684\u53d8\u91cf\u5176\u4ed6\u7ebf\u7a0b\u80fd\u770b\u5230\u3002<\/li>\n<li>\u89c4\u52193\uff1a\u6709\u7ebf\u7a0bT\uff0c\u53d8\u91cfV\u3001\u53d8\u91cfW\u3002\u5047\u8bbe\u52a8\u4f5cA\u662fT\u5bf9V\u7684use\u6216assign\u52a8\u4f5c\uff0cP\u662f\u6839\u636e\u89c4\u52192\u30013\u4e0eA\u5173\u8054\u7684read\u6216write\u52a8\u4f5c\uff1b\u52a8\u4f5cB\u662fT\u5bf9W\u7684use\u6216assign\u52a8\u4f5c\uff0cQ\u662f\u6839\u636e\u89c4\u52192\u30013\u4e0eB\u5173\u8054\u7684read\u6216write\u52a8\u4f5c\u3002\u5982\u679cA\u5148\u4e0eB\uff0c\u90a3\u4e48P\u5148\u4e0eQ\u3002&#8212;&#8212;\u8fd9\u4fdd\u8bc1\u4e86volatile\u4fee\u9970\u7684\u53d8\u91cf\u4e0d\u4f1a\u88ab\u6307\u4ee4\u91cd\u6392\u5e8f\u4f18\u5316\uff0c\u4ee3\u7801\u7684\u6267\u884c\u987a\u5e8f\u4e0e\u7a0b\u5e8f\u7684\u987a\u5e8f\u76f8\u540c\u3002<\/li>\n<\/ul>\n<h2>Part2\u4f7f\u7528volatile\u5173\u952e\u5b57\u7684\u7279\u6027<\/h2>\n<h4>\u88abvolatile\u4fee\u9970\u7684\u53d8\u91cf\u4fdd\u8bc1\u5bf9\u6240\u6709\u7ebf\u7a0b\u53ef\u89c1\u3002<\/h4>\n<p>\u7531\u4e0a\u6587\u7684\u89c4\u52191\u30012\u53ef\u77e5\uff0cvolatile\u53d8\u91cf\u5bf9\u6240\u6709\u7ebf\u7a0b\u662f\u7acb\u5373\u53ef\u89c1\u7684\uff0c\u5728\u5404\u4e2a\u7ebf\u7a0b\u4e2d\u4e0d\u5b58\u5728\u4e00\u81f4\u6027\u95ee\u9898\u3002\u90a3\u4e48\uff0c\u6211\u4eec\u662f\u5426\u80fd\u5f97\u51fa\u7ed3\u8bba\uff1avolatile\u53d8\u91cf\u5728\u5e76\u53d1\u8fd0\u7b97\u4e0b\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u5462\uff1f\u8fd9\u786e\u5b9e\u662f\u4e00\u4e2a\u975e\u5e38\u5e38\u89c1\u7684\u8bef\u89e3\uff0c\u5199\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre><code>public class VolatileTest extends Thread{\n    static volatile int increase = 0;\n    static AtomicInteger aInteger=new AtomicInteger();\/\/\u5bf9\u7167\u7ec4\n    static void increaseFun() {\n        increase++;\n        aInteger.incrementAndGet();\n    }\n    public void run(){\n        int i=0;\n        while (i &lt; 10000) {\n            increaseFun();\n            i++;\n        }\n    }\n    public static void main(String[] args) {\n        VolatileTest vt = new VolatileTest();\n        int THREAD_NUM = 10;\n        Thread[] threads = new Thread[THREAD_NUM];\n        for (int i = 0; i &lt; THREAD_NUM; i++) {\n            threads[i] = new Thread(vt, &quot;\u7ebf\u7a0b&quot; + i);\n            threads[i].start();\n        }\n        \/\/idea\u4e2d\u4f1a\u8fd4\u56de\u4e3b\u7ebf\u7a0b\u548c\u5b88\u62a4\u7ebf\u7a0b\uff0c\u5982\u679c\u7528Eclipse\u7684\u8bdd\u6539\u4e3a1\n        while (Thread.activeCount() &gt; 2) {\n            Thread.yield();\n        }\n        System.out.println(&quot;volatile\u7684\u503c: &quot;+increase);\n        System.out.println(&quot;AtomicInteger\u7684\u503c: &quot;+aInteger);\n    }\n}<\/code><\/pre>\n<p>\u8fd9\u4e2a\u7a0b\u5e8f\u6211\u4eec\u8dd1\u4e8610\u4e2a\u7ebf\u7a0b\u540c\u65f6\u5bf9volatile\u4fee\u9970\u7684\u53d8\u91cf\u8fdb\u884c10000\u7684\u81ea\u589e\u64cd\u4f5c(AtomicInteger\u5b9e\u73b0\u4e86\u539f\u5b50\u6027\uff0c\u4f5c\u4e3a\u5bf9\u7167\u7ec4)\uff0c\u5982\u679cvolatile\u53d8\u91cf\u662f\u5e76\u53d1\u5b89\u5168\u7684\u8bdd\uff0c\u8fd0\u884c\u7ed3\u679c\u5e94\u8be5\u4e3a100000\uff0c\u53ef\u662f\u591a\u6b21\u8fd0\u884c\u540e\uff0c\u6bcf\u6b21\u7684\u7ed3\u679c\u5747\u5c0f\u4e8e\u9884\u671f\u503c\u3002\u663e\u7136\u4e0a\u6587\u7684\u8bf4\u6cd5\u662f\u6709\u95ee\u9898\u7684\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc1ArA\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>volatile\u4fee\u9970\u7684\u53d8\u91cf\u5e76\u4e0d\u4fdd\u503c\u539f\u5b50\u6027\uff0c\u6240\u4ee5\u5728\u4e0a\u8ff0\u7684\u4f8b\u5b50\u4e2d\uff0c\u7528volatile\u6765\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u4e0d\u9760\u8c31\u3002\u6211\u4eec\u7528Javap\u5bf9\u8fd9\u6bb5\u4ee3\u7801\u8fdb\u884c\u53cd\u7f16\u8bd1\uff0c\u4e3a\u4ec0\u4e48\u4e0d\u9760\u8c31\u7b80\u76f4\u4e00\u76ee\u4e86\u7136\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc1ArB\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>getstatic\u6307\u4ee4\u628aincrease\u7684\u503c\u62ff\u5230\u4e86\u64cd\u4f5c\u6808\u7684\u9876\u90e8\uff0c\u6b64\u65f6\u7531\u4e8evolatile\u7684\u89c4\u5219\uff0c\u8be5\u503c\u662f\u6b63\u786e\u7684\u3002<\/p>\n<p>iconst_1\u548ciadd\u6307\u4ee4\u5728\u6267\u884c\u7684\u65f6\u5019increase\u7684\u503c\u5f88\u6709\u53ef\u80fd\u5df2\u7ecf\u88ab\u5176\u4ed6\u7ebf\u7a0b\u52a0\u5927\uff0c\u6b64\u65f6\u6808\u9876\u7684\u503c\u8fc7\u671f\u3002<\/p>\n<p>putstatic\u6307\u4ee4\u63a5\u7740\u628a\u8fc7\u671f\u7684\u503c\u540c\u6b65\u56de\u4e3b\u5b58\uff0c\u5bfc\u81f4\u4e86\u6700\u7ec8\u7ed3\u679c\u8f83\u5c0f\u3002<\/p>\n<p>volatile\u5173\u952e\u5b57\u53ea\u4fdd\u8bc1\u53ef\u89c1\u6027\uff0c\u6240\u4ee5\u5728\u4ee5\u4e0b\u60c5\u51b5\u4e2d\uff0c\u9700\u8981\u4f7f\u7528\u9501\u6765\u4fdd\u8bc1\u539f\u5b50\u6027\uff1a<\/p>\n<ul>\n<li>\u8fd0\u7b97\u7ed3\u679c\u4f9d\u8d56\u53d8\u91cf\u7684\u5f53\u524d\u503c\uff0c\u5e76\u4e14\u6709\u4e0d\u6b62\u4e00\u4e2a\u7ebf\u7a0b\u5728\u4fee\u6539\u53d8\u91cf\u7684\u503c\u3002<\/li>\n<li>\u53d8\u91cf\u9700\u8981\u4e0e\u5176\u4ed6\u72b6\u6001\u53d8\u91cf\u5171\u540c\u53c2\u4e0e\u4e0d\u53d8\u7ea6\u675f<\/li>\n<\/ul>\n<p>\u90a3\u4e48volatile\u7684\u8fd9\u4e2a\u7279\u6027\u7684\u4f7f\u7528\u573a\u666f\u662f\u4ec0\u4e48\u5462\uff1f<\/p>\n<blockquote>\n<ul>\n<li>\u6a21\u5f0f1\uff1a\u72b6\u6001\u6807\u5fd7<\/li>\n<li>\u6a21\u5f0f2\uff1a\u72ec\u7acb\u89c2\u5bdf\uff08independent observation\uff09<\/li>\n<li>\u6a21\u5f0f3\uff1a\u201cvolatile bean\u201d \u6a21\u5f0f<\/li>\n<li>\u6a21\u5f0f4\uff1a\u5f00\u9500\u8f83\u4f4e\u7684\u201c\u8bfb\uff0d\u5199\u9501\u201d\u7b56\u7565<\/li>\n<\/ul>\n<\/blockquote>\n<p>\u5177\u4f53\u573a\u666f &#8212; blog.csdn.net\/vking_wang\/article\/details\/9982709<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc1ArC\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h4>\u7981\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f\u4f18\u5316\u3002<\/h4>\n<p>\u7531\u4e0a\u6587\u7684\u89c4\u52193\u53ef\u77e5\uff0cvolatile\u53d8\u91cf\u7684\u7b2c\u4e8c\u4e2a\u8bed\u4e49\u662f\u7981\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f\u3002\u6307\u4ee4\u91cd\u6392\u5e8f\u662f\u4ec0\u4e48\uff1f\u7b80\u5355\u70b9\u8bf4\u5c31\u662f jvm\u4f1a\u628a\u4ee3\u7801\u4e2d\u6ca1\u6709\u4f9d\u8d56\u8d4b\u503c\u7684\u5730\u65b9\u6253\u4e71\u6267\u884c\u987a\u5e8f\uff0c\u7531\u4e8e\u4e00\u4e9b\u89c4\u5219\u9650\u5b9a\uff0c\u6211\u4eec\u5728\u5355\u7ebf\u7a0b\u5185\u89c2\u5bdf\u4e0d\u5230\u6253\u4e71\u7684\u73b0\u8c61\uff08\u7ebf\u7a0b\u5185\u8868\u73b0\u4e3a\u4e32\u884c\u7684\u8bed\u4e49\uff09\uff0c\u4f46\u662f\u5728\u5e76\u53d1\u7a0b\u5e8f\u4e2d\uff0c\u4ece\u522b\u7684\u7ebf\u7a0b\u770b\u53e6\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u64cd\u4f5c\u662f\u65e0\u5e8f\u7684\u3002\u4e00\u4e2a\u975e\u5e38\u7ecf\u5178\u7684\u6307\u4ee4\u91cd\u6392\u5e8f\u4f8b\u5b50\uff1a<\/p>\n<pre><code>public class SingletonTest {\n    private volatile static SingletonTest instance = null;\n    private SingletonTest() { }\n    public static SingletonTest getInstance() {\n        if(instance == null) {\n            synchronized (SingletonTest.class){\n                if(instance == null) {\n                    instance = new SingletonTest();  \/\/\u975e\u539f\u5b50\u64cd\u4f5c\n                }\n            }\n        }\n        return instance;\n    }\n}<\/code><\/pre>\n<p>\u8fd9\u662f\u5355\u4f8b\u6a21\u5f0f\u4e2d\u7684\u201c\u53cc\u91cd\u68c0\u67e5\u52a0\u9501\u6a21\u5f0f\u201d\uff0c\u6211\u4eec\u770b\u5230instance\u7528\u4e86volatile\u4fee\u9970\uff0c\u7531\u4e8e instance = new SingletonTest();\u53ef\u5206\u89e3\u4e3a\uff1a<\/p>\n<blockquote>\n<ol>\n<li>memory =allocate(); \/\/\u5206\u914d\u5bf9\u8c61\u7684\u5185\u5b58\u7a7a\u95f4<\/li>\n<li>ctorInstance(memory); \/\/\u521d\u59cb\u5316\u5bf9\u8c61<\/li>\n<li>instance =memory; \/\/\u8bbe\u7f6einstance\u6307\u5411\u521a\u5206\u914d\u7684\u5185\u5b58\u5730\u5740<\/li>\n<\/ol>\n<\/blockquote>\n<p>\u64cd\u4f5c2\u4f9d\u8d561\uff0c\u4f46\u662f\u64cd\u4f5c3\u4e0d\u4f9d\u8d562\uff0c\u6240\u4ee5\u6709\u53ef\u80fd\u51fa\u73b01,3,2\u7684\u987a\u5e8f\uff0c\u5f53\u51fa\u73b0\u8fd9\u79cd\u987a\u5e8f\u7684\u65f6\u5019\uff0c\u867d\u7136instance\u4e0d\u4e3a\u7a7a\uff0c\u4f46\u662f\u5bf9\u8c61\u4e5f\u6709\u53ef\u80fd\u6ca1\u6709\u6b63\u786e\u521d\u59cb\u5316\uff0c\u4f1a\u51fa\u9519\u3002<\/p>\n<h2>Part3\u603b\u7ed3<\/h2>\n<p>\u5e76\u53d1\u4e09\u7279\u5f81\u53ef\u89c1\u6027\u548c\u6709\u5e8f\u6027\u548c\u539f\u5b50\u6027\u4e2d\uff0cvolatile<\/p>\n<p>\u901a\u8fc7\u65b0\u503c\u7acb\u5373\u540c\u6b65\u5230\u4e3b\u5185\u5b58\u548c\u6bcf\u6b21\u4f7f\u7528\u524d\u4ece\u4e3b\u5185\u5b58\u5237\u65b0\u673a\u5236\u4fdd\u8bc1\u4e86\u53ef\u89c1\u6027\u3002<\/p>\n<p>\u901a\u8fc7\u7981\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f\u4fdd\u8bc1\u4e86\u6709\u5e8f\u6027\u3002<\/p>\n<p>\u65e0\u6cd5\u4fdd\u8bc1\u539f\u5b50\u6027\u3002<\/p>\n<p>\u800c\u6211\u4eec\u77e5\u9053\uff0csynchronized\u5173\u952e\u5b57<\/p>\n<p>\u901a\u8fc7lock\u548cunlock\u64cd\u4f5c\u4fdd\u8bc1\u4e86\u539f\u5b50\u6027\uff0c<\/p>\n<p>\u901a\u8fc7\u5bf9\u4e00\u4e2a\u53d8\u91cfunlock\u524d\uff0c\u628a\u53d8\u91cf\u540c\u6b65\u56de\u4e3b\u5185\u5b58\u4e2d\u4fdd\u8bc1\u4e86\u53ef\u89c1\u6027\uff0c<\/p>\n<p>\u901a\u8fc7\u4e00\u4e2a\u53d8\u91cf\u5728\u540c\u4e00\u65f6\u523b\u53ea\u5141\u8bb8\u4e00\u6761\u7ebf\u7a0b\u5bf9\u5176\u8fdb\u884clock\u64cd\u4f5c\u4fdd\u8bc1\u4e86\u6709\u5e8f\u6027\u3002<\/p>\n<p>\u4ed6\u7684\u201c\u4e07\u80fd\u201d\u4e5f\u95f4\u63a5\u5bfc\u81f4\u4e86\u6211\u4eec\u5bf9synchronized\u5173\u952e\u5b57\u7684\u6ee5\u7528\uff0c\u8d8a\u6cdb\u7528\u7684\u63a7\u5236\uff0c\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\u4e5f\u8d8a\u5927\uff0c\u867d\u7136jvm\u4e0d\u65ad\u7684\u5bf9synchronized\u5173\u952e\u5b57\u8fdb\u884c\u5404\u79cd\u5404\u6837\u7684\u4f18\u5316\uff0c\u4f46\u662f\u6211\u4eec\u8fd8\u662f\u8981\u5728\u5408\u9002\u7684\u65f6\u5019\u60f3\u8d77volatile\u5173\u952e\u5b57\u554a\uff0c\u54c8\u54c8\u54c8\u54c8\u3002<\/p>\n<p>\u53c2\u8003\u6750\u6599\uff1a<\/p>\n<p>&lt;&lt;\u6df1\u5165\u7406\u89e3Java\u865a\u62df\u673a&gt;&gt; \u5468\u5fd7\u660e \u8457\/<br \/><a href=\"https:\/\/link.segmentfault.com\/?enc=SHlC84Rg0nHucv3pzBdUsg%3D%3D.gvG%2FlmGv0aQRb301jxIhoK3Bzl0KGpfgMe44lx%2FwYAr6igvlzfdn875%2BRvsXitN3Qeff6gZcfbLvE9jZyC65QQ%3D%3D\" rel=\"nofollow\">https:\/\/blog.csdn.net\/chunyua&#8230;<\/a>\/<br \/><a href=\"https:\/\/link.segmentfault.com\/?enc=BSXUm2UdctWEcBLP2sHoGA%3D%3D.6njl%2FeIRM6asfCOElgJqBeuUCOwfmqhflT5y0sqiWyHQMTmVZNkHJATQ%2BM1AvCT%2Bk34Qig96hIWw5%2F4%2Fg8BKWw%3D%3D\" rel=\"nofollow\">https:\/\/blog.csdn.net\/vking_w&#8230;<\/a><\/p>\n<p><strong>\u8fd1\u671f\u70ed\u6587\u63a8\u8350\uff1a<\/strong><\/p>\n<p>1.<a href=\"https:\/\/link.segmentfault.com\/?enc=tgLLtgZ6z9lmymHMerTv1w%3D%3D.78NZX8%2BF1og8vCylYVJHS3Ahhv2PGEXxKZzQuEVpoTQ%3D\" rel=\"nofollow\">1,000+ \u9053 Java\u9762\u8bd5\u9898\u53ca\u7b54\u6848\u6574\u7406(2022\u6700\u65b0\u7248)<\/a><\/p>\n<p>2.<a href=\"https:\/\/link.segmentfault.com\/?enc=X%2Fgaoyxj8XFdsa5ALxuBDw%3D%3D.I72kxaj3%2Bzi79S%2F6F%2BJxvMq5ZTXAo9NLn1iyly%2BLADpkkuecpPB67LZ9DgFOIGHlRCd1x%2FuvZl6c13aCh%2BuFIOS54qrlBZwGrqQoAGSsp5o%3D\" rel=\"nofollow\">\u52b2\u7206\uff01Java \u534f\u7a0b\u8981\u6765\u4e86\u3002\u3002\u3002<\/a><\/p>\n<p>3.<a href=\"https:\/\/link.segmentfault.com\/?enc=vj2rF%2FAK07ACwk%2FpD8nE0A%3D%3D.%2BhJVILwWWdHcYHHuZaOkhnnmKV6fUfJ3Z378sMMKPBs8HvQs3euE6R33mLla3WJl\" rel=\"nofollow\">Spring Boot 2.x \u6559\u7a0b\uff0c\u592a\u5168\u4e86\uff01<\/a><\/p>\n<p>4.<a href=\"https:\/\/link.segmentfault.com\/?enc=XjmJg4UpJyZ%2BSHAb0JWnmg%3D%3D.G%2F1kobRRIMr6P1bIjPWmDEOj4x2EFGuGM73JNOINGV3Rp7nsu1lpIjs748aD5NgiFmV5LEf9nx2xgOkRiiDWqVIq2sX5jSIogZ8L0fJgYBI%3D\" rel=\"nofollow\">\u522b\u518d\u5199\u6ee1\u5c4f\u7684\u7206\u7206\u7206\u70b8\u7c7b\u4e86\uff0c\u8bd5\u8bd5\u88c5\u9970\u5668\u6a21\u5f0f\uff0c\u8fd9\u624d\u662f\u4f18\u96c5\u7684\u65b9\u5f0f\uff01\uff01<\/a><\/p>\n<p>5.<a href=\"https:\/\/link.segmentfault.com\/?enc=yIA%2Bt0bYzOuuFqyADuVV3Q%3D%3D.DpscB4vn3qmu4KRBAHNlaarrSO8zQaQwZ8nk06I9UyUxQaJK1kbU%2Fj3J7l%2FztmyUh3JVjjIe%2Fkb75LEWPcf%2Bi%2FiooBDbboA08tJq%2BpHRT%2BRMSd7lP78PN4yoH%2BAd8n1T\" rel=\"nofollow\">\u300aJava\u5f00\u53d1\u624b\u518c\uff08\u5d69\u5c71\u7248\uff09\u300b\u6700\u65b0\u53d1\u5e03\uff0c\u901f\u901f\u4e0b\u8f7d\uff01<\/a><\/p>\n<p>\u89c9\u5f97\u4e0d\u9519\uff0c\u522b\u5fd8\u4e86\u968f\u624b\u70b9\u8d5e+\u8f6c\u53d1\u54e6\uff01<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000042285086\">https:\/\/segmentfault.com\/a\/1190000042285086<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6765\u6e90: blog.csdn.net\/fumitzuki\/article\/details\/81630048 vo [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-10006135","post","type-post","status-publish","format-standard","hentry"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10006135"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006135\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10006135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10006135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10006135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}