{"id":52272,"date":"2025-08-11T12:24:14","date_gmt":"2025-08-11T04:24:14","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/52272.html"},"modified":"2025-08-11T12:24:14","modified_gmt":"2025-08-11T04:24:14","slug":"java%e5%ad%a6%e4%b9%a0%e7%ac%ac%e4%b8%80%e7%99%be%e4%ba%8c%e5%8d%81%e5%85%ad%e9%83%a8%e5%88%86-%e9%94%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/52272.html","title":{"rendered":"Java\u5b66\u4e60\u7b2c\u4e00\u767e\u4e8c\u5341\u516d\u90e8\u5206\u2014\u2014\u9501"},"content":{"rendered":"<p id=\"main-toc\">\u76ee\u5f55<\/p>\n<p id=\"%E4%B8%80%E3%80%81%E5%89%8D%E8%A8%80%E7%AE%80%E4%BB%8B-toc\" style=\"margin-left:0px\">\u4e00\u3001\u524d\u8a00\u7b80\u4ecb<\/p>\n<p id=\"%E4%BA%8C%E3%80%81%E5%9F%BA%E7%A1%80%E9%94%81%E2%80%94%E2%80%94synchronized%E5%85%B3%E9%94%AE%E5%AD%97-toc\" style=\"margin-left:0px\">\u4e8c\u3001\u57fa\u7840\u9501\u2014\u2014synchronized\u5173\u952e\u5b57<\/p>\n<p id=\"%E4%B8%89%E3%80%81%E9%AB%98%E7%BA%A7%E9%94%81%E2%80%94%E2%80%94java.util.concurrent.locks%E5%8C%85-toc\" style=\"margin-left:0px\">\u4e09\u3001\u9ad8\u7ea7\u9501\u2014\u2014java.util.concurrent.locks\u5305<\/p>\n<p id=\"%E4%B8%89%E3%80%81%E9%94%81%E7%9A%84%E4%BC%98%E5%8C%96%E6%8A%80%E6%9C%AF%E4%B8%8E%E5%AE%9E%E8%B7%B5%E5%BB%BA%E8%AE%AE-toc\" style=\"margin-left:0px\">\u4e09\u3001\u9501\u7684\u4f18\u5316\u6280\u672f\u4e0e\u5b9e\u8df5\u5efa\u8bae<\/p>\n<p id=\"%E5%9B%9B%E3%80%81%E9%94%81%E7%9A%84%E8%AE%BE%E8%AE%A1%E5%8E%9F%E7%90%86%E4%B8%8E%E5%86%85%E5%AD%98%E6%A8%A1%E5%9E%8B-toc\" style=\"margin-left:0px\">\u56db\u3001\u9501\u7684\u8bbe\u8ba1\u539f\u7406\u4e0e\u5185\u5b58\u6a21\u578b<\/p>\n<p id=\"%E4%BA%94%E3%80%81%E9%94%81%E7%9A%84%E4%BD%BF%E7%94%A8%E5%AF%B9%E6%AF%94%E4%B8%8E%E9%80%89%E5%9E%8B%E5%BB%BA%E8%AE%AE-toc\" style=\"margin-left:0px\">\u4e94\u3001\u9501\u7684\u4f7f\u7528\u5bf9\u6bd4\u4e0e\u9009\u578b\u5efa\u8bae<\/p>\n<p id=\"%E5%85%AD%E3%80%81%E6%80%BB%E7%BB%93%E5%BD%92%E7%BA%B3-toc\" style=\"margin-left:0px\">\u516d\u3001\u603b\u7ed3\u5f52\u7eb3<\/p>\n<hr id=\"hr-toc\" \/>\n<h2 style=\"background-color:transparent\">\u4e00\u3001\u524d\u8a00\u7b80\u4ecb<\/h2>\n<p>\u00a0 \u00a0 \u00a0 \u00a0Java\u4e2d\u7684\u9501\u673a\u5236\u662f<span style=\"color:#fe2c24\">\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65\u3001\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027\u548c\u907f\u514d\u7ade\u6001\u6761\u4ef6<\/span>\u7684\u6838\u5fc3\u5de5\u5177&#xff0c;\u4e3b\u8981\u5206\u4e3a\u57fa\u7840\u9501&#xff08;\u5185\u7f6e\u9501&#xff09;\u548c\u9ad8\u7ea7\u9501&#xff08;java.util.concurrent.locks\u5305&#xff09;\u3002<\/p>\n<h2 id=\"%E4%BA%8C%E3%80%81%E5%9F%BA%E7%A1%80%E9%94%81%E2%80%94%E2%80%94synchronized%E5%85%B3%E9%94%AE%E5%AD%97\" style=\"background-color:transparent\">\u4e8c\u3001\u57fa\u7840\u9501\u2014\u2014synchronized\u5173\u952e\u5b57<\/h2>\n<p><span style=\"color:#956fe7\">1.\u00a0\u5b9e\u73b0\u539f\u7406<\/span><\/p>\n<ul>\n<li>\n<p>\u57fa\u4e8eJVM\u5185\u7f6e\u7684\u76d1\u89c6\u5668\u9501&#xff08;Monitor&#xff09;&#xff0c;\u901a\u8fc7\u5bf9\u8c61\u5934\u7684Mark Word\u5b9e\u73b0\u3002<\/p>\n<\/li>\n<li>\n<p>\u901a\u8fc7\u5b57\u8282\u7801\u6307\u4ee4monitorenter\u548cmonitorexit\u63a7\u5236\u9501\u7684\u83b7\u53d6\u4e0e\u91ca\u653e\u3002<\/p>\n<\/li>\n<\/ul>\n<p><span style=\"color:#956fe7\">2.\u00a0\u4f7f\u7528\u65b9\u5f0f<\/span><\/p>\n<ul>\n<li>\n<p><span style=\"color:#4da8ee\">\u540c\u6b65\u4ee3\u7801\u5757&#xff1a;<\/span>\u663e\u5f0f\u6307\u5b9a\u9501\u5bf9<\/p>\n<\/li>\n<\/ul>\n<p>public void method() {<br \/>\n\u00a0\u00a0\u00a0 synchronized (lockObject) {\u00a0 \/\/ lockObject\u53ef\u4ee5\u662f\u4efb\u610f\u5bf9\u8c61<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ \u4e34\u754c\u533a\u4ee3\u7801<br \/>\n\u00a0\u00a0\u00a0 }<br \/>\n} <\/p>\n<ul>\n<li>\n<p><span style=\"color:#4da8ee\">\u540c\u6b65\u5b9e\u4f8b\u65b9\u6cd5&#xff1a;<\/span>\u9501\u662f\u5f53\u524d\u5b9e\u4f8b&#xff08;this&#xff09;<\/p>\n<\/li>\n<\/ul>\n<p>public synchronized void method() {<br \/>\n\u00a0\u00a0\u00a0 \/\/ \u4e34\u754c\u533a\u4ee3\u7801<br \/>\n} <\/p>\n<ul>\n<li>\n<p><span style=\"color:#4da8ee\">\u540c\u6b65\u9759\u6001\u65b9\u6cd5&#xff1a;<\/span>\u9501\u662f\u5f53\u524d\u7c7b\u7684Class\u5bf9\u8c61<\/p>\n<\/li>\n<\/ul>\n<p>public static synchronized void staticMethod() {<br \/>\n    \/\/ \u4e34\u754c\u533a\u4ee3\u7801<br \/>\n} <\/p>\n<p><span style=\"color:#956fe7\">3.\u00a0\u6838\u5fc3\u7279\u6027<\/span><\/p>\n<ul>\n<li>\n<p><span style=\"color:#4da8ee\">\u53ef\u91cd\u5165\u6027&#xff1a;<\/span>\u540c\u4e00\u7ebf\u7a0b\u53ef\u91cd\u590d\u83b7\u53d6\u540c\u4e00\u628a\u9501\u3002<\/p>\n<\/li>\n<li>\n<p><span style=\"color:#4da8ee\">\u975e\u516c\u5e73\u9501&#xff1a;<\/span>\u9ed8\u8ba4\u4e0d\u4fdd\u8bc1\u7b49\u5f85\u7ebf\u7a0b\u7684\u83b7\u53d6\u987a\u5e8f\u3002<\/p>\n<\/li>\n<li>\n<p><span style=\"color:#4da8ee\">\u81ea\u52a8\u91ca\u653e&#xff1a;<\/span>\u7ebf\u7a0b\u6267\u884c\u5b8c\u6bd5\u6216\u5f02\u5e38\u65f6\u81ea\u52a8\u91ca\u653e\u9501\u3002<\/p>\n<\/li>\n<li>\n<p><span style=\"color:#4da8ee\">\u963b\u585e\u7b49\u5f85&#xff1a;<\/span>\u672a\u83b7\u53d6\u9501\u7684\u7ebf\u7a0b\u4f1a\u8fdb\u5165\u963b\u585e\u72b6\u6001&#xff08;BLOCKED&#xff09;\u3002<\/p>\n<\/li>\n<\/ul>\n<p><span style=\"color:#956fe7\">4.\u00a0\u4f18\u7f3a\u70b9<\/span><\/p>\n<ul>\n<li>\n<p><span style=\"color:#4da8ee\">\u4f18\u70b9&#xff1a;<\/span>\u7b80\u5355\u6613\u7528&#xff0c;\u65e0\u9700\u624b\u52a8\u91ca\u653e\u9501\u3002<\/p>\n<\/li>\n<li>\n<p><span style=\"color:#4da8ee\">\u7f3a\u70b9&#xff1a;<\/span>\u529f\u80fd\u5355\u4e00&#xff08;\u4e0d\u652f\u6301\u8d85\u65f6\u3001\u4e2d\u65ad\u7b49&#xff09;\u3002<\/p>\n<\/li>\n<\/ul>\n<h2 id=\"%E4%B8%89%E3%80%81%E9%AB%98%E7%BA%A7%E9%94%81%E2%80%94%E2%80%94java.util.concurrent.locks%E5%8C%85\" style=\"background-color:transparent\">\u4e09\u3001\u9ad8\u7ea7\u9501\u2014\u2014java.util.concurrent.locks\u5305<\/h2>\n<p style=\"background-color:transparent\"><span style=\"color:#fe2c24\">ReentrantLock&#xff08;\u53ef\u91cd\u5165\u9501&#xff09;<\/span><\/p>\n<p><span style=\"color:#956fe7\">1.\u6838\u5fc3\u7279\u6027&#xff1a;<\/span><\/p>\n<ul>\n<li>\n<p><span style=\"color:#4da8ee\">\u53ef\u91cd\u5165\u6027&#xff1a;<\/span>\u540csynchronized\u3002<\/p>\n<\/li>\n<li>\n<p><span style=\"color:#4da8ee\">\u516c\u5e73\u6027\u9009\u62e9&#xff1a;<\/span>\u652f\u6301\u516c\u5e73\u9501&#xff08;new ReentrantLock(true)&#xff09;\u548c\u975e\u516c\u5e73\u9501&#xff08;\u9ed8\u8ba4&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p><span style=\"color:#4da8ee\">\u5c1d\u8bd5\u83b7\u53d6\u9501&#xff1a;<\/span>tryLock()&#xff08;\u7acb\u5373\u8fd4\u56de&#xff09;\u548ctryLock(long timeout, TimeUnit unit)&#xff08;\u8d85\u65f6\u7b49\u5f85&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p><span style=\"color:#4da8ee\">\u53ef\u4e2d\u65ad&#xff1a;<\/span>lockInterruptibly()\u54cd\u5e94\u4e2d\u65ad\u3002<\/p>\n<\/li>\n<li>\n<p><span style=\"color:#4da8ee\">\u6761\u4ef6\u53d8\u91cf&#xff1a;<\/span>\u901a\u8fc7newCondition()\u521b\u5efaCondition\u5bf9\u8c61&#xff0c;\u5b9e\u73b0\u7cbe\u7ec6\u7b49\u5f85\/\u901a\u77e5\u3002<\/p>\n<\/li>\n<\/ul>\n<p><span style=\"color:#956fe7\">2.\u793a\u4f8b\u4ee3\u7801&#xff1a;<\/span><\/p>\n<p>Lock lock &#061; new ReentrantLock();<br \/>\nCondition condition &#061; lock.newCondition();<\/p>\n<p>lock.lock();\u00a0 \/\/ \u624b\u52a8\u52a0\u9501<br \/>\ntry {<br \/>\n\u00a0\u00a0\u00a0 while (conditionNotMet) {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 condition.await();\u00a0 \/\/ \u91ca\u653e\u9501\u5e76\u7b49\u5f85<br \/>\n\u00a0\u00a0\u00a0 }<br \/>\n\u00a0\u00a0\u00a0 \/\/ \u4e34\u754c\u533a\u4ee3\u7801<br \/>\n\u00a0\u00a0\u00a0 condition.signal();\u00a0 \/\/ \u5524\u9192\u7b49\u5f85\u7ebf\u7a0b<br \/>\n} finally {<br \/>\n\u00a0\u00a0\u00a0 lock.unlock();\u00a0 \/\/ \u5fc5\u987b\u624b\u52a8\u91ca\u653e\u9501<br \/>\n} <\/p>\n<p><span style=\"color:#fe2c24\">ReentrantReadWriteLock&#xff08;\u8bfb\u5199\u9501&#xff09;<\/span><\/p>\n<p><span style=\"color:#956fe7\">1.\u6838\u5fc3\u601d\u60f3&#xff1a;<\/span>\u8bfb\u5199\u5206\u79bb&#xff0c;\u63d0\u5347\u8bfb\u591a\u5199\u5c11\u573a\u666f\u7684\u6027\u80fd\u3002<\/p>\n<p><span style=\"color:#4da8ee\">\u8bfb\u9501&#xff08;\u5171\u4eab\u9501&#xff09;&#xff1a;<\/span>\u5141\u8bb8\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bfb\u3002<\/p>\n<p><span style=\"color:#38d8f0\">\u5199\u9501&#xff08;\u72ec\u5360\u9501&#xff09;&#xff1a;<\/span>\u53ea\u5141\u8bb8\u4e00\u4e2a\u7ebf\u7a0b\u5199&#xff08;\u4e14\u6392\u65a5\u6240\u6709\u8bfb\/\u5199&#xff09;\u3002<\/p>\n<p><span style=\"color:#956fe7\">2.\u793a\u4f8b\u4ee3\u7801&#xff1a;<\/span><\/p>\n<p>ReadWriteLock rwLock &#061; new ReentrantReadWriteLock();<\/p>\n<p>\/\/ \u8bfb\u64cd\u4f5c<br \/>\nrwLock.readLock().lock();<br \/>\ntry {<br \/>\n\u00a0\u00a0\u00a0 \/\/ \u5e76\u53d1\u8bfb\u64cd\u4f5c<br \/>\n} finally {<br \/>\n\u00a0\u00a0\u00a0 rwLock.readLock().unlock();<br \/>\n}<\/p>\n<p>\/\/ \u5199\u64cd\u4f5c<br \/>\nrwLock.writeLock().lock();<br \/>\ntry {<br \/>\n\u00a0\u00a0\u00a0 \/\/ \u72ec\u5360\u5199\u64cd\u4f5c<br \/>\n} finally {<br \/>\n\u00a0\u00a0\u00a0 rwLock.writeLock().unlock();<br \/>\n} <\/p>\n<p>\u9501\u964d\u7ea7&#xff1a;\u5141\u8bb8\u4ece\u5199\u9501\u964d\u7ea7\u4e3a\u8bfb\u9501&#xff08;\u9632\u6b62\u5176\u4ed6\u5199\u9501\u63d2\u5165&#xff09;\u3002<\/p>\n<p><span style=\"color:#fe2c24\">StampedLock&#xff08;\u90ae\u6233\u9501&#xff0c;Java 8&#043;&#xff09;<\/span><\/p>\n<p><span style=\"color:#956fe7\">1.\u4e09\u79cd\u6a21\u5f0f&#xff1a;<\/span><\/p>\n<ul>\n<li>\n<p><span style=\"color:#4da8ee\">\u5199\u9501&#xff08;Writing Lock&#xff09;&#xff1a;<\/span>\u72ec\u5360\u9501&#xff0c;\u7c7b\u4f3cReentrantLock\u3002<\/p>\n<\/li>\n<li>\n<p><span style=\"color:#4da8ee\">\u60b2\u89c2\u8bfb\u9501&#xff08;Pessimistic Reading&#xff09;&#xff1a;<\/span>\u7c7b\u4f3c\u8bfb\u5199\u9501\u7684\u8bfb\u9501\u3002<\/p>\n<\/li>\n<li>\n<p><span style=\"color:#4da8ee\">\u4e50\u89c2\u8bfb&#xff08;Optimistic Reading&#xff09;&#xff1a;<\/span>\u65e0\u9501\u673a\u5236&#xff0c;\u8bfb\u65f6\u4e0d\u963b\u585e\u5199\u64cd\u4f5c\u3002<\/p>\n<\/li>\n<\/ul>\n<p><span style=\"color:#956fe7\">2.\u4f18\u52bf&#xff1a;<\/span>\u6027\u80fd\u66f4\u9ad8&#xff08;\u5c24\u5176\u8bfb\u591a\u5199\u5c11\u573a\u666f&#xff09;&#xff0c;\u4f46API\u590d\u6742\u3002<\/p>\n<p><span style=\"color:#956fe7\">3.\u793a\u4f8b\u4ee3\u7801&#xff1a;<\/span><\/p>\n<p>StampedLock lock &#061; new StampedLock();<\/p>\n<p>\/\/ \u4e50\u89c2\u8bfb<br \/>\nlong stamp &#061; lock.tryOptimisticRead();<br \/>\n\/\/ \u8bfb\u64cd\u4f5c&#8230;<br \/>\nif (!lock.validate(stamp)) {\u00a0 \/\/ \u68c0\u67e5\u662f\u5426\u6709\u5199\u64cd\u4f5c<br \/>\n\u00a0\u00a0\u00a0 stamp &#061; lock.readLock();\u00a0 \/\/ \u5347\u7ea7\u4e3a\u60b2\u89c2\u8bfb\u9501<br \/>\n\u00a0\u00a0\u00a0 try {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ \u91cd\u65b0\u8bfb\u6570\u636e<br \/>\n\u00a0\u00a0\u00a0 } finally {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 lock.unlockRead(stamp);<br \/>\n\u00a0\u00a0\u00a0 }<br \/>\n}<\/p>\n<p>\/\/ \u5199\u9501<br \/>\nlong stamp &#061; lock.writeLock();<br \/>\ntry {<br \/>\n\u00a0\u00a0\u00a0 \/\/ \u5199\u64cd\u4f5c<br \/>\n} finally {<br \/>\n\u00a0\u00a0\u00a0 lock.unlockWrite(stamp);<br \/>\n} <\/p>\n<h2 id=\"%E4%B8%89%E3%80%81%E9%94%81%E7%9A%84%E4%BC%98%E5%8C%96%E6%8A%80%E6%9C%AF%E4%B8%8E%E5%AE%9E%E8%B7%B5%E5%BB%BA%E8%AE%AE\" style=\"background-color:transparent\">\u4e09\u3001\u9501\u7684\u4f18\u5316\u6280\u672f\u4e0e\u5b9e\u8df5\u5efa\u8bae<\/h2>\n<ul>\n<li>\n<p>\u200b\u200b\u9501\u6d88\u9664\u200b\u200b&#xff1a;\u68c0\u6d4b\u65e0\u7ade\u4e89\u4ee3\u7801&#xff0c;\u79fb\u9664\u540c\u6b65\u64cd\u4f5c\u3002<\/p>\n<\/li>\n<li>\n<p>\u200b\u200b\u9501\u7c97\u5316\u200b\u200b&#xff1a;\u5408\u5e76\u76f8\u90bb\u540c\u6b65\u5757&#xff0c;\u51cf\u5c11\u9501\u5f00\u9500\u3002<\/p>\n<\/li>\n<li>\n<p>\u200b\u200b\u81ea\u9002\u5e94\u81ea\u65cb\u200b\u200b&#xff1a;\u6839\u636e\u7ade\u4e89\u52a8\u6001\u8c03\u6574\u81ea\u65cb\u6b21\u6570&#xff0c;\u907f\u514d\u7ebf\u7a0b\u963b\u585e\u3002<\/p>\n<\/li>\n<li>\n<p>\u200b\u200b\u907f\u514d\u6b7b\u9501\u200b\u200b&#xff1a;\u6309\u56fa\u5b9a\u987a\u5e8f\u83b7\u53d6\u9501&#xff0c;\u6216\u4f7f\u7528tryLock()\u8d85\u65f6\u673a\u5236\u3002<\/p>\n<\/li>\n<li>\n<p>\u200b\u200b\u51cf\u5c0f\u9501\u7c92\u5ea6\u200b\u200b&#xff1a;\u540c\u6b65\u8303\u56f4\u6700\u5c0f\u5316&#xff08;\u5982\u7528ConcurrentHashMap\u5206\u6bb5\u9501&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u77ed\u4efb\u52a1 \u2192 synchronized&#xff08;\u81ea\u52a8\u4f18\u5316&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u9ad8\u7ade\u4e89\u5199\u5165 \u2192 \u60b2\u89c2\u9501\u3002<\/p>\n<\/li>\n<li>\n<p>\u4f4e\u51b2\u7a81\u8ba1\u6570 \u2192 CAS\u539f\u5b50\u7c7b\u3002<\/p>\n<\/li>\n<\/ul>\n<h2 id=\"%E5%9B%9B%E3%80%81%E9%94%81%E7%9A%84%E8%AE%BE%E8%AE%A1%E5%8E%9F%E7%90%86%E4%B8%8E%E5%86%85%E5%AD%98%E6%A8%A1%E5%9E%8B\" style=\"background-color:transparent\">\u56db\u3001\u9501\u7684\u8bbe\u8ba1\u539f\u7406\u4e0e\u5185\u5b58\u6a21\u578b<\/h2>\n<ul>\n<li>\n<p>\u200b\u200bHappens-Before\u89c4\u5219\u200b\u200b&#xff1a;\u9501\u91ca\u653e\u64cd\u4f5c\u5bf9\u540e\u7eed\u52a0\u9501\u64cd\u4f5c\u53ef\u89c1&#xff0c;\u786e\u4fdd\u5185\u5b58\u4e00\u81f4\u6027\u3002<\/p>\n<\/li>\n<li>\n<p>\u200b\u200bAQS\u6846\u67b6\u200b\u200b&#xff1a;\u6838\u5fc3\u662fvolatile int state\u548cFIFO\u961f\u5217&#xff0c;\u901a\u8fc7CAS\u7ba1\u7406\u7ade\u4e89\u7ebf\u7a0b&#xff08;\u5982ReentrantLock\u5b9e\u73b0&#xff09;\u3002<\/p>\n<\/li>\n<\/ul>\n<h2 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id=\"%E5%85%AD%E3%80%81%E6%80%BB%E7%BB%93%E5%BD%92%E7%BA%B3\" style=\"background-color:transparent\">\u516d\u3001\u603b\u7ed3\u5f52\u7eb3<\/h2>\n<p>\u00a0 \u00a0 \u00a0 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