{"id":412,"date":"2015-04-19T17:25:22","date_gmt":"2015-04-19T09:25:22","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=412"},"modified":"2026-08-18T12:09:31","modified_gmt":"2026-08-18T04:09:31","slug":"java-synchronized%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=412","title":{"rendered":"java synchronized\u8be6\u89e3"},"content":{"rendered":"<section id=\"wenyan\" style=\"font-family: system-ui, 'Apple Color Emoji', 'Segoe UI', 'Segoe UI Symbol', 'Noto Sans', Roboto, sans-serif; line-height: 1.75; font-size: 16px; color: #000000; caret-color: #000000;\" data-provider=\"WenYan\">\n<p style=\"margin: 1em 0px;\"><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">synchronized<\/code> \u662f Java \u5173\u952e\u5b57\u3002\u7528\u6765\u4fee\u9970\u65b9\u6cd5\u6216\u4ee3\u7801\u5757\u65f6\uff0c\u80fd\u4fdd\u8bc1\u540c\u4e00\u65f6\u523b\u6700\u591a\u53ea\u6709\u4e00\u6761\u7ebf\u7a0b\u6267\u884c\u8fd9\u6bb5\u4ee3\u7801\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u5b83\u6709\u4e24\u79cd\u7528\u6cd5\uff1a<strong style=\"color: #4870ac;\">synchronized \u65b9\u6cd5<\/strong> \u548c <strong style=\"color: #4870ac;\">synchronized \u5757<\/strong>\u3002\u9501\u6c38\u8fdc\u52a0\u5728\u5bf9\u8c61\u4e0a\uff0c\u4e0d\u662f\u52a0\u5728\u300c\u4e00\u6bb5\u4ee3\u7801\u300d\u4e0a\u3002\u6bcf\u4e2a\u5bf9\u8c61\u53ea\u6709\u4e00\u628a\u9501\u3002\u540c\u6b65\u5f88\u8d35\uff0c\u8fd8\u53ef\u80fd\u6b7b\u9501\uff0c\u80fd\u5c11\u5219\u5c11\u3002<\/p>\n<p><!--more--><\/p>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u4e00\u3001\u4e94\u6761\u89c4\u5219\uff08\u5148\u770b\u7ed3\u8bba\uff09<\/h2>\n<ul style=\"padding-left: 1rem; margin-left: 1rem; font-size: 0.9rem; list-style-type: disc;\">\n<li>\n<section>\u4e24\u4e2a\u5e76\u53d1\u7ebf\u7a0b\u8bbf\u95ee\u540c\u4e00\u4e2a\u5bf9\u8c61\u91cc\u7684 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">synchronized(this)<\/code> \u5757\u65f6\uff0c\u540c\u4e00\u65f6\u95f4\u53ea\u80fd\u6709\u4e00\u6761\u7ebf\u7a0b\u6267\u884c\uff0c\u53e6\u4e00\u6761\u5fc5\u987b\u7b49\u3002<\/section>\n<\/li>\n<li>\n<section>\u4e00\u6761\u7ebf\u7a0b\u8fdb\u4e86 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">synchronized(this)<\/code> \u5757\uff0c\u53e6\u4e00\u6761\u4ecd\u53ef\u4ee5\u8dd1\u8be5\u5bf9\u8c61\u91cc<strong style=\"color: #4870ac;\">\u975e<\/strong> synchronized \u7684\u4ee3\u7801\u3002<\/section>\n<\/li>\n<li>\n<section>\u4e00\u6761\u7ebf\u7a0b\u8fdb\u4e86 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">synchronized(this)<\/code> \u5757\uff0c\u5176\u5b83\u7ebf\u7a0b\u5bf9\u8be5\u5bf9\u8c61\u91cc<strong style=\"color: #4870ac;\">\u6240\u6709\u5176\u5b83<\/strong> <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">synchronized(this)<\/code> \u5757\u7684\u8bbf\u95ee\u90fd\u4f1a\u88ab\u5835\u4f4f\u3002<\/section>\n<\/li>\n<li>\n<section>\u7b2c\u4e09\u6761\u5bf9\u300c\u5176\u5b83\u540c\u6b65\u4ee3\u7801\u300d\u540c\u6837\u6210\u7acb\uff1a\u62ff\u5230\u7684\u662f\u8fd9\u4e2a object \u7684\u5bf9\u8c61\u9501\uff0c\u8be5\u5bf9\u8c61\u4e0a\u6240\u6709\u540c\u6b65\u90e8\u5206\u90fd\u88ab\u6682\u65f6\u963b\u585e\u3002<\/section>\n<\/li>\n<li>\n<section>\u4ee5\u4e0a\u89c4\u5219\u5bf9\u5176\u5b83\u5bf9\u8c61\u9501\u540c\u6837\u9002\u7528\uff08\u4e0d\u4e00\u5b9a\u662f this\uff09\u3002<\/section>\n<\/li>\n<\/ul>\n<table style=\"display: table; text-align: left; overflow: auto; border-collapse: collapse; margin: 1.4em auto; max-width: 100%; table-layout: fixed; overflow-wrap: break-word; word-break: break-all;\" width=\"800\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top; text-align: center; font-weight: bold; color: #4870ac; background: #f7f7f7;\">\u573a\u666f<\/th>\n<th style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top; text-align: center; font-weight: bold; color: #4870ac; background: #f7f7f7;\">\u53e6\u4e00\u6761\u7ebf\u7a0b\u80fd\u4e0d\u80fd\u8fdb<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">\u540c\u4e00\u5bf9\u8c61\uff0c\u53e6\u4e00\u6bb5 synchronized(this) \/ synchronized \u65b9\u6cd5<\/td>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">\u4e0d\u80fd\uff0c\u8981\u7b49\u9501<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">\u540c\u4e00\u5bf9\u8c61\uff0c\u666e\u901a\u975e\u540c\u6b65\u65b9\u6cd5<\/td>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">\u80fd\uff0c\u4e92\u4e0d\u5e72\u6270<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">\u53e6\u4e00\u5bf9\u8c61\u7684\u540c\u6b65\u65b9\u6cd5<\/td>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">\u80fd\uff0c\u9501\u4e0d\u662f\u540c\u4e00\u628a<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">synchronized(inner) \u5bf9 Inner \u4e0a\u9501\uff0c\u53e6\u4e00\u7ebf\u7a0b\u8dd1 Inner \u7684\u975e\u540c\u6b65\u65b9\u6cd5<\/td>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">\u80fd<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">synchronized(inner) \u5bf9 Inner \u4e0a\u9501\uff0c\u53e6\u4e00\u7ebf\u7a0b\u8dd1 Inner \u7684\u540c\u6b65\u65b9\u6cd5<\/td>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">\u4e0d\u80fd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u4e8c\u3001\u540c\u4e00\u628a this \u9501\uff1a\u4e92\u65a5<\/h2>\n<p style=\"margin: 1em 0px;\">\u89c4\u5219\u4e00\uff1a\u4e24\u4e2a\u7ebf\u7a0b\u5171\u7528\u540c\u4e00\u4e2a Runnable \u5b9e\u4f8b\uff0c<code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">synchronized(this)<\/code> \u628a\u5faa\u73af\u5305\u8d77\u6765\uff0cA \u8dd1\u5b8c 0\uff5e4\uff0cB \u624d\u80fd\u8fdb\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">package ths;\n\npublic class Thread1 implements Runnable {  \n\n     public void run() {  \n\n          synchronized(this) {  \n\n               for (int i = 0; i &lt; 5; i++) {  \n\n                    System.out.println(Thread.currentThread().getName() + \" synchronized loop \" + i);  \n\n               }  \n\n          }  \n\n     }  \n\n     public static void main(String[] args) {  \n\n          Thread1 t1 = new Thread1();  \n\n          Thread ta = new Thread(t1, \"A\");  \n\n          Thread tb = new Thread(t1, \"B\");  \n\n          ta.start();  \n\n          tb.start();  \n\n     } \n\n}<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u7ed3\u679c\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">A synchronized loop 0\nA synchronized loop 1\nA synchronized loop 2\nA synchronized loop 3\nA synchronized loop 4\nB synchronized loop 0\nB synchronized loop 1\nB synchronized loop 2\nB synchronized loop 3\nB synchronized loop 4<\/code><\/pre>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u4e09\u3001\u975e\u540c\u6b65\u65b9\u6cd5\u4e0d\u53d7\u5f71\u54cd<\/h2>\n<p style=\"margin: 1em 0px;\">\u89c4\u5219\u4e8c\uff1at1 \u8fdb m4t1 \u7684\u540c\u6b65\u5757\u65f6\uff0ct2 \u4ecd\u80fd\u8dd1\u6ca1\u6709 synchronized \u7684 m4t2\uff0c\u8f93\u51fa\u4ea4\u9519\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">package ths;\n\npublic class Thread2 {  \n\n     public void m4t1() {  \n\n          synchronized(this) {  \n\n               int i = 5;  \n\n               while( i-- &gt; 0) {  \n\n                    System.out.println(Thread.currentThread().getName() + \" : \" + i);  \n\n                    try {  \n\n                         Thread.sleep(500);  \n\n                    } catch (InterruptedException ie) {  \n\n                    }  \n\n               }  \n\n          }  \n\n     }  \n\n     public void m4t2() {  \n\n          int i = 5;  \n\n          while( i-- &gt; 0) {  \n\n               System.out.println(Thread.currentThread().getName() + \" : \" + i);  \n\n               try {  \n\n                    Thread.sleep(500);  \n\n               } catch (InterruptedException ie) {  \n\n               }  \n\n          }  \n\n     }  \n\n     public static void main(String[] args) {  \n\n          final Thread2 myt2 = new Thread2();  \n\n          Thread t1 = new Thread(  new Runnable() {  public void run() {  myt2.m4t1();  }  }, \"t1\"  );  \n\n          Thread t2 = new Thread(  new Runnable() {  public void run() { myt2.m4t2();   }  }, \"t2\"  );  \n\n          t1.start();  \n\n          t2.start();  \n\n     } \n\n}<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u7ed3\u679c\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">t1 : 4\nt2 : 4\nt1 : 3\nt2 : 3\nt1 : 2\nt2 : 2\nt1 : 1\nt2 : 1\nt1 : 0\nt2 : 0<\/code><\/pre>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u56db\u3001\u5176\u5b83 synchronized(this) \u4f1a\u88ab\u5835\u4f4f<\/h2>\n<p style=\"margin: 1em 0px;\">\u89c4\u5219\u4e09\uff1a\u7ed9 m4t2 \u4e5f\u52a0\u4e0a <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">synchronized(this)<\/code>\uff0c\u4e24\u6761\u7ebf\u7a0b\u4e32\u884c\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">public void m4t2() {  \n\n          synchronized(this) {  \n\n               int i = 5;  \n\n               while( i-- &gt; 0) {  \n\n                    System.out.println(Thread.currentThread().getName() + \" : \" + i);  \n\n                    try {  \n\n                         Thread.sleep(500);  \n\n                    } catch (InterruptedException ie) {  \n\n                    }  \n\n               }  \n\n          }\n\n     }<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u7ed3\u679c\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">t1 : 4\nt1 : 3\nt1 : 2\nt1 : 1\nt1 : 0\nt2 : 4\nt2 : 3\nt2 : 2\nt2 : 1\nt2 : 0<\/code><\/pre>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u4e94\u3001\u540c\u6b65\u65b9\u6cd5\u540c\u6837\u62ff\u5bf9\u8c61\u9501<\/h2>\n<p style=\"margin: 1em 0px;\">\u89c4\u5219\u56db\uff1a\u628a m4t2 \u6539\u6210\u540c\u6b65\u65b9\u6cd5\uff0c\u6548\u679c\u548c\u540c\u6b65\u5757\u76f8\u540c\u2014\u2014\u62ff\u5230\u7684\u4ecd\u662f\u8fd9\u4e2a\u5bf9\u8c61\u7684\u9501\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">\/\/\u4fee\u6539Thread2.m4t2()\u65b9\u6cd5\u5982\u4e0b\uff1a\n\n     public synchronized void m4t2() {  \n\n          int i = 5;  \n\n          while( i-- &gt; 0) {  \n\n               System.out.println(Thread.currentThread().getName() + \" : \" + i);  \n\n               try {  \n\n                    Thread.sleep(500);  \n\n               } catch (InterruptedException ie) {  \n\n               }  \n\n          }  \n\n     }<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u7ed3\u679c\u4e0e\u4e0a\u4e00\u8282\u76f8\u540c\u3002<\/p>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u516d\u3001\u9501\u53ef\u4ee5\u662f\u522b\u7684\u5bf9\u8c61<\/h2>\n<p style=\"margin: 1em 0px;\">\u89c4\u5219\u4e94\uff1a\u7528\u5185\u90e8\u7c7b Inner \u5f53\u9501\u3002t1 \u901a\u8fc7 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">synchronized(inner)<\/code> \u8c03 m4t1\uff1bt2 \u76f4\u63a5\u8c03\u975e\u540c\u6b65\u7684 m4t2\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">package ths;\n\npublic class Thread3 { \n\n     class Inner { \n\n          private void m4t1() { \n\n               int i = 5; \n\n               while(i-- &gt; 0) { \n\n                    System.out.println(Thread.currentThread().getName() + \" : Inner.m4t1()=\" + i); \n\n                    try { \n\n                         Thread.sleep(500); \n\n                    } catch(InterruptedException ie) { \n\n                    } \n\n               } \n\n          } \n\n          private void m4t2() { \n\n               int i = 5; \n\n               while(i-- &gt; 0) { \n\n                    System.out.println(Thread.currentThread().getName() + \" : Inner.m4t2()=\" + i); \n\n                    try { \n\n                         Thread.sleep(500); \n\n                    } catch(InterruptedException ie) { \n\n                    } \n\n               } \n\n          } \n\n     } \n\n     private void m4t1(Inner inner) { \n\n          synchronized(inner) { \/\/\u4f7f\u7528\u5bf9\u8c61\u9501 \n\n          inner.m4t1(); \n\n     } \n\n     private void m4t2(Inner inner) { \n\n          inner.m4t2(); \n\n     } \n\n     public static void main(String[] args) { \n\n          final Thread3 myt3 = new Thread3(); \n\n          final Inner inner = myt3.new Inner(); \n\n          Thread t1 = new Thread( new Runnable() {public void run() { myt3.m4t1(inner);} }, \"t1\"); \n\n     Thread t2 = new Thread( new Runnable() {public void run() { myt3.m4t2(inner);} }, \"t2\"); \n\n     t1.start(); \n\n     t2.start(); \n\n  } \n\n}<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u5c3d\u7ba1 t1 \u62ff\u5230\u4e86 Inner \u7684\u5bf9\u8c61\u9501\uff0ct2 \u8bbf\u95ee\u7684\u662f\u540c\u4e00 Inner \u91cc\u7684\u975e\u540c\u6b65\u90e8\u5206\uff0c\u6240\u4ee5\u4e92\u4e0d\u5e72\u6270\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">t1 : Inner.m4t1()=4\nt2 : Inner.m4t2()=4\nt1 : Inner.m4t1()=3\nt2 : Inner.m4t2()=3\nt1 : Inner.m4t1()=2\nt2 : Inner.m4t2()=2\nt1 : Inner.m4t1()=1\nt2 : Inner.m4t2()=1\nt1 : Inner.m4t1()=0\nt2 : Inner.m4t2()=0<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u73b0\u5728\u7ed9 Inner.m4t2 \u52a0\u4e0a synchronized\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">private synchronized void m4t2() {  \n\n          int i = 5;  \n\n          while(i-- &gt; 0) {  \n\n               System.out.println(Thread.currentThread().getName() + \" : Inner.m4t2()=\" + i);  \n\n               try {  \n\n                    Thread.sleep(500);  \n\n               } catch(InterruptedException ie) {  \n\n               }  \n\n          }  \n\n     }<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">t1 \u4e0e t2 \u8bbf\u95ee\u7684\u662f Inner \u91cc\u4e24\u6bb5\u4e0d\u76f8\u5e72\u7684\u4ee3\u7801\uff0c\u4f46 t1 \u5148\u62ff\u5230 Inner \u7684\u5bf9\u8c61\u9501\uff0ct2 \u8fdb\u540c\u6b65\u65b9\u6cd5 m4t2 \u4e5f\u88ab\u5835\u4f4f\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">t1 : Inner.m4t1()=4\nt1 : Inner.m4t1()=3\nt1 : Inner.m4t1()=2\nt1 : Inner.m4t1()=1\nt1 : Inner.m4t1()=0\nt2 : Inner.m4t2()=4\nt2 : Inner.m4t2()=3\nt2 : Inner.m4t2()=2\nt2 : Inner.m4t2()=1\nt2 : Inner.m4t2()=0<\/code><\/pre>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u4e03\u3001synchronized \u65b9\u6cd5 vs \u5757<\/h2>\n<p style=\"margin: 1em 0px;\">\u58f0\u660e\u540c\u6b65\u65b9\u6cd5\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">public synchronized void accessVal(int newVal);<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u6bcf\u4e2a\u7c7b\u5b9e\u4f8b\u4e00\u628a\u9501\u3002\u540c\u6b65\u65b9\u6cd5\u5fc5\u987b\u5148\u62ff\u5230\u8c03\u7528\u8be5\u65b9\u6cd5\u7684\u90a3\u4e2a\u5b9e\u4f8b\u7684\u9501\u624d\u80fd\u6267\u884c\uff0c\u5426\u5219\u6240\u5c5e\u7ebf\u7a0b\u963b\u585e\uff1b\u65b9\u6cd5\u4e00\u65e6\u6267\u884c\u5c31\u72ec\u5360\u9501\uff0c\u8fd4\u56de\u624d\u91ca\u653e\u3002\u8fd9\u6837\u4fdd\u8bc1\uff1a\u540c\u4e00\u5b9e\u4f8b\u4e0a\uff0c\u6240\u6709 synchronized \u6210\u5458\u51fd\u6570\u540c\u4e00\u65f6\u523b\u6700\u591a\u4e00\u4e2a\u5728\u8dd1\uff0c\u4ece\u800c\u907f\u514d\u6210\u5458\u53d8\u91cf\u88ab\u540c\u65f6\u6539\uff08\u524d\u63d0\u662f\u6240\u6709\u53ef\u80fd\u6539\u6210\u5458\u7684\u65b9\u6cd5\u90fd\u58f0\u660e\u4e3a synchronized\uff09\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u4e0d\u5149\u5b9e\u4f8b\u6709\u9501\uff0c\u6bcf\u4e2a Class \u4e5f\u6709\u4e00\u628a\u9501\u3002\u9759\u6001\u540c\u6b65\u65b9\u6cd5\u62ff\u7684\u662f\u7c7b\u9501\uff0c\u7528\u6765\u4fdd\u62a4\u9759\u6001\u6210\u5458\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u7f3a\u9677\uff1a\u5927\u65b9\u6cd5\u6574\u6bb5 synchronized \u4f1a\u4e25\u91cd\u62d6\u6162\u3002\u82e5\u628a\u7ebf\u7a0b\u7684 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">run()<\/code> \u505a\u6210 synchronized\uff0c\u7ebf\u7a0b\u6d3b\u7740\u671f\u95f4\u4e00\u76f4\u5360\u9501\uff0c\u672c\u7c7b\u5176\u5b83\u540c\u6b65\u65b9\u6cd5\u6c38\u8fdc\u8fdb\u4e0d\u53bb\u3002\u53ef\u4ee5\u628a\u8bbf\u95ee\u6210\u5458\u7684\u4ee3\u7801\u62bd\u5230\u5c0f\u7684\u540c\u6b65\u65b9\u6cd5\u91cc\uff0c\u7531\u4e3b\u65b9\u6cd5\u53bb\u8c03\uff1b\u66f4\u597d\u7684\u529e\u6cd5\u662f\u7528\u540c\u6b65\u5757\uff0c\u53ea\u9501\u771f\u6b63\u9700\u8981\u4e92\u65a5\u7684\u90a3\u51e0\u884c\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u540c\u6b65\u5757\u8bed\u6cd5\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">synchronized(syncObject) {\n    \/\/ \u5141\u8bb8\u8bbf\u95ee\u63a7\u5236\u7684\u4ee3\u7801\n}<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u5fc5\u987b\u62ff\u5230 syncObject\uff08\u5b9e\u4f8b\u6216 Class\uff09\u7684\u9501\u624d\u80fd\u8fdb\u3002\u53ef\u4ee5\u5bf9\u4efb\u610f\u4ee3\u7801\u5757\u3001\u4efb\u610f\u6307\u5b9a\u4e0a\u9501\u5bf9\u8c61\uff0c\u66f4\u7075\u6d3b\u3002<\/p>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u516b\u3001\u5927\u623f\u5b50\u6bd4\u55bb<\/h2>\n<p style=\"margin: 1em 0px;\">\u628a\u4e00\u4e2a object \u6bd4\u4f5c\u6c38\u8fdc\u655e\u7740\u5927\u95e8\u7684\u5927\u623f\u5b50\uff0c\u91cc\u9762\u5f88\u591a\u623f\u95f4\uff08\u65b9\u6cd5\uff09\uff1a\u6709\u7684\u4e0a\u9501\uff08\u540c\u6b65\u65b9\u6cd5\uff09\uff0c\u6709\u7684\u4e0d\u4e0a\u9501\uff08\u666e\u901a\u65b9\u6cd5\uff09\u3002\u95e8\u53e3\u4e00\u628a\u94a5\u5319\uff0c\u80fd\u5f00\u6240\u6709\u4e0a\u9501\u7684\u623f\u95f4\u3002\u60f3\u8c03\u8fd9\u4e2a\u5bf9\u8c61\u65b9\u6cd5\u7684\u7ebf\u7a0b\uff0c\u5c31\u662f\u60f3\u8fdb\u67d0\u95f4\u623f\u7684\u4eba\u3002\u524d\u63d0\uff1a\u5bf9\u8c61\u81f3\u5c11\u6709\u4e00\u4e2a\u540c\u6b65\u65b9\u6cd5\uff0c\u5426\u5219\u94a5\u5319\u6ca1\u610f\u4e49\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u666e\u901a\u60c5\u51b5\u4e0b\u94a5\u5319\u539f\u5219\u662f\u300c\u968f\u7528\u968f\u501f\uff0c\u7528\u5b8c\u5373\u8fd8\u300d\uff1a\u8fdb\u4e0a\u9501\u623f\u95f4\u524d\u5230\u95e8\u53e3\u62ff\u94a5\u5319\uff0c\u7528\u5b8c\u9a6c\u4e0a\u8fd8\u3002\u5373\u4f7f\u8fde\u7eed\u7528\u4e24\u95f4\u4e0a\u9501\u623f\u95f4\uff0c\u4e2d\u95f4\u4e5f\u8981\u8fd8\u518d\u53d6\u3002\u4e0d\u4e0a\u9501\u7684\u623f\u95f4\u8c01\u90fd\u80fd\u8fdb\uff0c\u51e0\u4e2a\u4eba\u6324\u4e00\u95f4\u4e5f\u884c\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u591a\u4eba\u7b49\u94a5\u5319\u65f6\uff0c\u8fd8\u56de\u6765\u4e4b\u540e\u8c01\u5148\u62ff\u5230\uff1f<strong style=\"color: #4870ac;\">\u89c4\u8303\u4e0d\u4fdd\u8bc1<\/strong>\u3002Thread.sleep \u7761\u591a\u4e45\u56de\u6765\u3001\u540c\u4f18\u5148\u7ea7\u8c01\u5148\u8dd1\u3001\u7b49\u5f85\u6c60\u91cc\u8c01\u5148\u62ff\u5230\u9501\uff0cJava \u89c4\u8303\u591a\u5904\u660e\u786e\u8bf4\u4e0d\u4fdd\u8bc1\uff0c\u6700\u7ec8\u7531 JVM \u6309\u591a\u6761\u6761\u4ef6\u51b3\u5b9a\u3002\u8ba1\u7b97\u673a\u91cc\u7684\u300c\u968f\u673a\u300d\u5176\u5b9e\u662f\u4f2a\u968f\u673a\uff1b\u4e0d\u5b9a\uff0c\u5f80\u5f80\u662f\u56e0\u4e3a\u8981\u5b9a\u4e0b\u6765\u592a\u8d35\u3001\u4e5f\u6ca1\u591a\u5927\u610f\u4e49\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u540c\u6b65\u5757\u548c\u540c\u6b65\u65b9\u6cd5\u6709\u4e24\u70b9\u4e0d\u540c\uff1a<\/p>\n<ul style=\"padding-left: 1rem; margin-left: 1rem; font-size: 0.9rem; list-style-type: disc;\">\n<li>\n<section>\u5c3a\u5bf8\u66f4\u5c0f\uff1a\u76f8\u5f53\u4e8e\u6ca1\u4e0a\u9501\u623f\u95f4\u91cc\u7528\u5e26\u9501\u5c4f\u98ce\u9694\u51fa\u7684\u4e00\u5757\u3002<\/section>\n<\/li>\n<li>\n<section>\u53ef\u4ee5\u6307\u5b9a\u7528\u53e6\u4e00\u680b\u623f\u5b50\u7684\u94a5\u5319\u5f00\u8fd9\u9762\u5c4f\u98ce\u3002\u62ff\u5230\u90a3\u680b\u623f\u5b50\u7684\u94a5\u5319\uff0c\u5e76\u4e0d\u59a8\u788d\u522b\u4eba\u8fdb\u90a3\u680b\u623f\u5b50\u91cc\u6ca1\u9501\u7684\u623f\u95f4\u3002<\/section>\n<\/li>\n<\/ul>\n<p style=\"margin: 1em 0px;\">\u4e3a\u4ec0\u4e48\u7528\u540c\u6b65\u5757\uff1f\u540c\u6b65\u8986\u76d6\u7684\u4ee3\u7801\u8d8a\u591a\uff0c\u6548\u7387\u8d8a\u5dee\u3002\u65b9\u6cd5\u91cc\u5e38\u5e38\u5148\u5efa\u5c40\u90e8\u53d8\u91cf\u518d\u8fd0\u7b97\u3001\u663e\u793a\uff1b\u53ea\u628a\u8be5\u4e92\u65a5\u7684\u8fd0\u7b97\u9501\u4f4f\u5373\u53ef\u3002\u53e6\u5916\uff0c\u540c\u6b65\u5757\u53ef\u4ee5\u5728\u9000\u51fa\u4e4b\u524d\u4e00\u76f4\u9738\u5360\u6307\u5b9a\u5bf9\u8c61\u7684 key\uff0c\u4e0d\u518d\u300c\u7528\u5b8c\u5373\u8fd8\u300d\u3002\u53ef\u4ee5\u53e6\u8d77\u4e00\u6761\u7ebf\u7a0b\uff0c\u628a\u540c\u6b65\u5757\u7684\u9501\u6307\u5411\u8fd9\u680b\u623f\u5b50\uff0c\u53ea\u8981\u8fdb\u5757\u65f6\u6293\u5230\u94a5\u5319\uff0c\u5c31\u80fd\u4e00\u76f4\u7559\u5230\u9000\u51fa\u2014\u2014\u751a\u81f3 sleep \u5341\u5206\u949f\uff0c\u95e8\u53e3\u4e00\u5343\u6761\u7ebf\u7a0b\u8fd8\u5728\u7b49\u3002<\/p>\n<p style=\"margin: 1em 0px;\"><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">sleep()<\/code> \u548c\u94a5\u5319\uff1a<strong style=\"color: #4870ac;\">\u7761\u7740\u4e5f\u4e0d\u8fd8\u94a5\u5319<\/strong>\u3002\u6ca1\u505a\u5b8c\u540c\u6b65\u5185\u5bb9\u5c31\u88ab sleep\uff0c\u94a5\u5319\u8fd8\u5728\u8eab\u4e0a\uff0c\u907f\u514d\u522b\u4eba\u8fdb\u5c4b\u628a\u4e1c\u897f\u641e\u4e71\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u4e3a\u4ec0\u4e48\u4e00\u628a\u94a5\u5319\u5f00\u6240\u6709\u4e0a\u9501\u7684\u95e8\uff0c\u800c\u4e0d\u662f\u4e00\u95e8\u4e00\u94a5\uff1f\u4e00\u95e8\u4e00\u94a5\u66f4\u5b89\u5168\uff0c\u4f46\u94a5\u5319\u7684\u4ea7\u751f\u3001\u4fdd\u7ba1\u3001\u83b7\u53d6\u3001\u5f52\u8fd8\u4f1a\u968f\u540c\u6b65\u65b9\u6cd5\u589e\u52a0\u5448\u51e0\u4f55\u7ea7\u590d\u6742\uff0c\u6548\u7387\u5d29\u6389\u3002\u8fd9\u662f\u5b89\u5168\u6027\u548c\u590d\u6742\u5ea6\u7684\u6743\u8861\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u53c2\u8003\uff1a<a href=\"http:\/\/hi.baidu.com\/sunshibing\/blog\/item\/5235b9b731d48ff430add14a.html\" style=\"color: #4870ac; text-decoration: underline;\">http:\/\/hi.baidu.com\/sunshibing\/blog\/item\/5235b9b731d48ff430add14a.html<\/a>\u3002<\/p>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u4e5d\u3001\u4e00\u4e2a\u7b80\u5355\u4f8b\u5b50<\/h2>\n<p style=\"margin: 1em 0px;\">\u56db\u4e2a\u7ebf\u7a0b\u62a2\u540c\u4e00\u628a <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">str<\/code> \u9501\uff0c\u628a num \u4ece 100 \u51cf\u5230 0\u3002\u4e2d\u95f4 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">Thread.sleep<\/code> \u662f\u4e3a\u4e86\u62c9\u5f00\u65f6\u95f4\u5dee\u3001\u5236\u9020\u51fa\u9519\u673a\u4f1a\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">public class TextThread {\n\npublic static void main(String[] args) { \n\n   TxtThread tt = new TxtThread(); \n\n   new Thread(tt).start(); \n\n   new Thread(tt).start(); \n\n   new Thread(tt).start(); \n\n   new Thread(tt).start(); \n\n} \n\n}\n\nclass TxtThread implements Runnable { \n\nint num = 100; \n\nString str = new String();\n\npublic void run() { \n\n   synchronized (str) { \n\n    while (num &gt; 0) {\n\n     try { \n\n      Thread.sleep(1); \n\n     } catch (Exception e) { \n\n      e.getMessage(); \n\n     } \n\n     System.out.println(Thread.currentThread().getName() \n\n       + \"this is \" + num--); \n\n    } \n\n   } \n\n} \n\n}<\/code><\/pre>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u5341\u3001\u9501\u52a0\u5728\u4e0d\u540c\u5730\u65b9\uff0c\u9501\u5b9a\u7684\u5bf9\u8c61\u4e0d\u4e00\u6837<\/h2>\n<p style=\"margin: 1em 0px;\">\u65e0\u8bba\u5173\u952e\u5b57\u52a0\u5728\u65b9\u6cd5\u4e0a\u8fd8\u662f\u5bf9\u8c61\u4e0a\uff0c\u62ff\u5230\u7684\u9501\u90fd\u662f\u5bf9\u8c61\u3002\u6bcf\u5bf9\u8c61\u4e00\u628a\u9501\u3002\u540c\u6b65\u5f00\u9500\u5927\uff0c\u8fd8\u53ef\u80fd\u6b7b\u9501\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u5047\u8bbe P1\u3001P2 \u662f\u540c\u4e00\u7c7b\u7684\u4e24\u4e2a\u5b9e\u4f8b\uff0c\u4e0b\u9762\u51e0\u79cd\u540c\u6b65\u5b83\u4eec\u90fd\u80fd\u8c03\u3002<\/p>\n<h3 style=\"padding: 0px; color: #4870ac; margin: 1.2em 0px 1em; font-size: 1.3em;\">1. synchronized \u4fee\u9970\u5b9e\u4f8b\u65b9\u6cd5<\/h3>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">Public synchronized void methodAAA()\n\n{\n\n\/\/\u2026.\n\n}<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u9501\u5b9a\u7684\u662f\u8c03\u7528\u8fd9\u4e2a\u65b9\u6cd5\u7684\u90a3\u4e2a\u5bf9\u8c61\u3002P1 \u5728\u4e0d\u540c\u7ebf\u7a0b\u91cc\u8c03\u8fd9\u4e2a\u65b9\u6cd5\u4f1a\u4e92\u65a5\uff1bP2 \u4ecd\u53ef\u4ee5\u968f\u4fbf\u8c03\u2014\u2014P1 \u90a3\u628a\u9501\u8ddf P2 \u65e0\u5173\u3002\u7b49\u4ef7\u4e8e\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">public void methodAAA()\n\n{\n\nsynchronized (this)      \/\/ (1)\n\n{\n\n       \/\/\u2026..\n\n}\n\n}<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u8fd9\u91cc\u7684 this \u5c31\u662f\u8c03\u7528\u65b9\uff08\u5982 P1\uff09\u3002\u5b9e\u8d28\u662f synchronized \u4f5c\u7528\u4e8e object reference\u3002<\/p>\n<h3 style=\"padding: 0px; color: #4870ac; margin: 1.2em 0px 1em; font-size: 1.3em;\">2. \u540c\u6b65\u5757\uff0c\u9501\u662f\u53c2\u6570\u6216\u79c1\u6709\u6570\u7ec4<\/h3>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">public void method3(SomeObject so)\n\n{\n\n    synchronized(so)\n\n    { \n\n       \/\/\u2026.. \n\n    }\n\n}<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u8fd9\u65f6\u9501\u662f so\u3002\u8c01\u62ff\u5230\u8c01\u8dd1\u3002\u6ca1\u6709\u73b0\u6210\u5bf9\u8c61\u5f53\u9501\u65f6\uff0c\u53ef\u4ee5\u9020\u4e00\u4e2a\u4e13\u7528 instance \u53d8\u91cf\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">class Foo implements Runnable\n\n{\n\n        private byte[] lock = new byte[0]; \/\/ \u7279\u6b8a\u7684instance\u53d8\u91cf\n\n        Public void methodA() \n\n        {\n\n           synchronized(lock) { \/\/\u2026 }\n\n        }\n\n        \/\/\u2026..\n\n}<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u96f6\u957f\u5ea6 byte \u6570\u7ec4\u6bd4 new Object() \u66f4\u4fbf\u5b9c\uff1a\u5b57\u8282\u7801\u5927\u7ea6 3 \u6761\u64cd\u4f5c\u7801\u5bf9 7 \u6761\u3002<\/p>\n<h3 style=\"padding: 0px; color: #4870ac; margin: 1.2em 0px 1em; font-size: 1.3em;\">3. synchronized \u4f5c\u7528\u4e8e static \/ Class<\/h3>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">Class Foo \n\n{\n\n    public synchronized static void methodAAA()   \/\/ \u540c\u6b65\u7684static \u51fd\u6570 \n\n    { \n\n        \/\/\u2026. \n\n    }\n\n    public void methodBBB() \n\n    {\n\n       synchronized(Foo.class)   \/\/ class literal(\u7c7b\u540d\u79f0\u5b57\u9762\u5e38\u91cf)\n\n    } \n\n}<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">methodAAA \u662f\u540c\u6b65\u9759\u6001\u65b9\u6cd5\uff0cmethodBBB \u7528 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">Foo.class<\/code> \u5f53\u9501\uff0c\u6548\u679c\u4e00\u6837\uff1a\u62ff\u5230\u7684\u662f Class \u8fd9\u628a\u9501\uff0c\u4e0d\u662f\u67d0\u4e2a\u5b9e\u4f8b\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u300aEffective Java\u300b\u6307\u51fa <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">Foo.class<\/code> \u548c <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">P1.getClass()<\/code> \u4f5c\u540c\u6b65\u9501\u5e76\u4e0d\u7b49\u540c\uff0c\u4e0d\u8981\u7528 getClass() \u53bb\u9501\u8fd9\u4e2a Class\u3002<\/p>\n<p style=\"margin: 1em 0px;\">\u82e5\u4e00\u4e2a\u7c7b\u65e2\u6709 synchronized static \u65b9\u6cd5 A\uff0c\u53c8\u6709 synchronized \u5b9e\u4f8b\u65b9\u6cd5 B\uff0c\u540c\u4e00\u5bf9\u8c61\u5728\u591a\u7ebf\u7a0b\u91cc\u5206\u522b\u8c03 A \u548c B\uff0c<strong style=\"color: #4870ac;\">\u4e0d\u4f1a\u4e92\u65a5<\/strong>\uff1aA \u7684\u9501\u662f Class\uff0cB \u7684\u9501\u662f\u5b9e\u4f8b\u3002<\/p>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u5341\u4e00\u3001\u5199\u66f4\u5b89\u5168\u7684\u540c\u6b65<\/h2>\n<ul style=\"padding-left: 1rem; margin-left: 1rem; font-size: 0.9rem; list-style-type: disc;\">\n<li>\n<section>instance \u53d8\u91cf\u505a\u6210 private\uff0c\u53ea\u7ed9 get\uff0c\u4e0d\u8981 public\/protected\u3002\u505a\u6210 public\uff0c\u5916\u9762\u5c31\u80fd\u7ed5\u8fc7\u540c\u6b65\u65b9\u6cd5\u76f4\u63a5\u6539\u2014\u2014\u8fd9\u4e5f\u662f JavaBean \u7684\u5e38\u89c1\u5199\u6cd5\u3002<\/section>\n<\/li>\n<li>\n<section>\u5982\u679c instance \u662f\u6570\u7ec4\u6216 ArrayList \u8fd9\u7c7b\u5bf9\u8c61\uff0cget \u51fa\u53bb\u7684\u662f\u5f15\u7528\uff0c\u8c03\u7528\u65b9\u53ef\u4ee5\u628a\u5b83\u6539\u6389\u3002\u8fd9\u65f6 get \u4e5f\u8981 synchronized\uff0c\u5e76\u4e14\u53ea\u8fd4\u56de <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">clone()<\/code>\uff0c\u8ba9\u8c03\u7528\u65b9\u62ff\u5230\u526f\u672c\u3002<\/section>\n<\/li>\n<\/ul>\n<blockquote style=\"display: block; font-size: 0.9em; border-left: 3px solid #4870ac; padding: 0.5em 1em; margin: 0px; background: #f6f8fa; color: #40464f;\">\n<p style=\"margin: 1em 0px;\"><strong style=\"color: #4870ac;\">\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1asynchronized \u9501\u7684\u662f\u5bf9\u8c61\uff1a\u540c\u4e00\u628a\u9501\u624d\u4e92\u65a5\uff0c\u975e\u540c\u6b65\u4ee3\u7801\u4e0d\u53d7\u5f71\u54cd\uff1b\u80fd\u9501\u5757\u5c31\u522b\u9501\u6574\u65b9\u6cd5\uff0c\u9759\u6001\u65b9\u6cd5\u548c\u5b9e\u4f8b\u65b9\u6cd5\u6839\u672c\u4e0d\u662f\u540c\u4e00\u628a\u9501\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>synchronized \u662f Java \u5173\u952e\u5b57\u3002\u7528\u6765\u4fee\u9970\u65b9\u6cd5\u6216\u4ee3\u7801\u5757\u65f6\uff0c\u80fd\u4fdd\u8bc1\u540c\u4e00\u65f6\u523b\u6700\u591a\u53ea\u6709\u4e00\u6761\u7ebf\u7a0b\u6267\u884c\u8fd9\u6bb5 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[19],"tags":[178],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/412"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=412"}],"version-history":[{"count":1,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/412\/revisions"}],"predecessor-version":[{"id":413,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/412\/revisions\/413"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=412"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=412"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=412"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}