{"id":3889,"date":"2025-07-13T11:41:39","date_gmt":"2025-07-13T03:41:39","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3889"},"modified":"2025-07-13T11:41:39","modified_gmt":"2025-07-13T03:41:39","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88-java-%e4%b8%ad-wait-%e5%92%8c-notify-%e5%bf%85%e9%a1%bb%e5%9c%a8-synchronized-%e4%bb%a3%e7%a0%81%e5%9d%97%e4%b8%ad%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/07\/13\/%e4%b8%ba%e4%bb%80%e4%b9%88-java-%e4%b8%ad-wait-%e5%92%8c-notify-%e5%bf%85%e9%a1%bb%e5%9c%a8-synchronized-%e4%bb%a3%e7%a0%81%e5%9d%97%e4%b8%ad%e4%bd%bf%e7%94%a8\/","title":{"rendered":"\u4e3a\u4ec0\u4e48 Java \u4e2d wait() \u548c notify() \u5fc5\u987b\u5728 synchronized \u4ee3\u7801\u5757\u4e2d\u4f7f\u7528"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">\u4e00\u3001\u6838\u5fc3\u7ed3\u8bba\uff08\u5b98\u65b9\u5b9a\u4e49\uff09<\/h1>\n\n\n\n<p>Java \u4e2d\u7684 <code>Object.wait()<\/code>\u3001<code>Object.notify()<\/code> \u548c <code>Object.notifyAll()<\/code> <strong>\u5fc5\u987b\u5728\u540c\u6b65\u4e0a\u4e0b\u6587\uff08<code>synchronized<\/code> \u5757\u6216\u65b9\u6cd5\uff09\u4e2d\u88ab\u8c03\u7528<\/strong>\uff0c\u5426\u5219\u4f1a\u629b\u51fa <code>java.lang.IllegalMonitorStateException<\/code>\u3002<\/p>\n\n\n\n<p>\u8fd9\u662f\u7531 Java \u865a\u62df\u673a\u7684<strong>\u5bf9\u8c61\u76d1\u89c6\u5668\uff08Monitor\uff09\u673a\u5236<\/strong>\u51b3\u5b9a\u7684\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\ud83d\udcda <strong>\u5b98\u65b9\u6587\u6863\u8bf4\u660e<\/strong>\uff08Java SE 8+\uff09\uff1a<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/lang\/Object.html#wait--\"><code>Object.wait()<\/code> &#8211; Java SE API docs<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/lang\/Object.html#notify--\"><code>Object.notify()<\/code> &#8211; Java SE API docs<\/a><\/li>\n<\/ul>\n\n\n\n<p><strong>\u539f\u6587\uff1a<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>This method should only be called by a thread that is the owner of this object&#8217;s monitor.<br>A thread becomes the owner of the object&#8217;s monitor in one of three ways:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>By executing a synchronized instance method of that object.<\/li>\n\n\n\n<li>By executing the body of a synchronized statement that synchronizes on the object.<\/li>\n\n\n\n<li>For class objects, by executing a synchronized static method of that class.<\/li>\n<\/ul>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u4e8c\u3001\u8be6\u7ec6\u6280\u672f\u5206\u6790<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1. \u80cc\u666f\uff1aJava \u4e2d\u7684\u5bf9\u8c61\u76d1\u89c6\u5668 Monitor<\/h2>\n\n\n\n<p>\u6bcf\u4e2a Java \u5bf9\u8c61\u90fd\u53ef\u4ee5\u7528\u4f5c\u4e00\u628a<strong>\u9501\uff08Lock\uff09<\/strong>\uff0c\u4e5f\u79f0\u4e3a\u201c\u76d1\u89c6\u5668\u9501\u201d\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u8fdb\u5165 <code>synchronized(obj)<\/code> \u65f6\uff0c\u5b83\u4f1a\u5c1d\u8bd5<strong>\u83b7\u53d6 obj \u7684 Monitor<\/strong>\u3002<\/li>\n\n\n\n<li>Monitor \u662f JVM \u7684\u4e00\u79cd\u540c\u6b65\u673a\u5236\uff0c\u662f <code>wait()<\/code> \/ <code>notify()<\/code> \u7b49\u884c\u4e3a\u7684\u57fa\u7840\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">2. <code>wait()<\/code>\u3001<code>notify()<\/code> \u7684\u5185\u90e8\u539f\u7406<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>wait()<\/code>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u5f53\u524d\u7ebf\u7a0b\u5fc5\u987b\u6301\u6709\u5bf9\u8c61\u7684 Monitor\u3002<\/li>\n\n\n\n<li>\u8c03\u7528\u540e\u7ebf\u7a0b\u4f1a<strong>\u91ca\u653e\u9501\uff0c\u5e76\u8fdb\u5165\u7b49\u5f85\u961f\u5217<\/strong>\uff0c\u76f4\u5230\u88ab <code>notify()<\/code> \u5524\u9192\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code>notify()<\/code>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u5f53\u524d\u7ebf\u7a0b\u4e5f\u5fc5\u987b\u6301\u6709\u5bf9\u8c61\u7684 Monitor\u3002<\/li>\n\n\n\n<li>\u5524\u9192\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4e00\u4e2a\u7ebf\u7a0b\uff08\u4e0d\u4f1a\u7acb\u5373\u6267\u884c\uff0c\u9700\u91cd\u65b0\u7ade\u4e89\u9501\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u91cd\u70b9\uff1a<strong>JVM \u89c4\u5b9a\u8fd9\u4e9b\u884c\u4e3a\u53ea\u80fd\u53d1\u751f\u5728\u6301\u6709\u5bf9\u8c61\u9501\u65f6\uff0c\u624d\u80fd\u4fdd\u8bc1\u539f\u5b50\u6027\u4e0e\u53ef\u89c1\u6027\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e3a\u4ec0\u4e48\u4e0d\u52a0 synchronized \u4f1a\u62a5\u9519\uff1f<\/h2>\n\n\n\n<p>\u5982\u679c\u4f60\u5199\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Object lock = new Object();\nlock.wait();  \/\/ \u274c \u62a5\u9519\uff1aIllegalMonitorStateException<\/code><\/pre>\n\n\n\n<p>\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u56e0\u4e3a\u5f53\u524d\u7ebf\u7a0b\u6ca1\u6709\u6301\u6709 <code>lock<\/code> \u7684 Monitor\u3002<\/p>\n\n\n\n<p>\u8fd9\u662f Java \u7684\u5b89\u5168\u673a\u5236\uff0c\u9632\u6b62\u7ebf\u7a0b\u5728\u672a\u52a0\u9501\u60c5\u51b5\u4e0b\u5f71\u54cd\u5171\u4eab\u72b6\u6001\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u4e09\u3001\u6e90\u7801\u8bc1\u660e\uff1aOpenJDK \u5b9e\u73b0<\/h1>\n\n\n\n<p>\u5728 <a href=\"https:\/\/github.com\/openjdk\/jdk\/blob\/master\/src\/java.base\/share\/native\/libjava\/Object.c\">OpenJDK 17<\/a> \u7684 <code>JVM_MonitorWait<\/code> \u4e2d\u53ef\u4ee5\u770b\u5230\u5982\u4e0b\u4ee3\u7801\u7247\u6bb5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject obj, jlong ms))\n  ...\n  if (!ObjectMonitor::is_owner(obj, current_thread)) {\n      THROW(vmSymbols::java_lang_IllegalMonitorStateException());\n  }\n  ...\nJVM_END<\/code><\/pre>\n\n\n\n<p>\u8bf4\u660e\uff1a\u5982\u679c\u5f53\u524d\u7ebf\u7a0b\u4e0d\u662f\u5bf9\u8c61\u7684\u62e5\u6709\u8005\uff08\u6ca1\u6709\u8fdb\u5165\u540c\u6b65\u5757\uff09\uff0c\u76f4\u63a5\u629b\u51fa <code>IllegalMonitorStateException<\/code>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u56db\u3001\u66ff\u4ee3\u65b9\u6848\uff1a\u4f7f\u7528 Lock + Condition \u66f4\u7075\u6d3b<\/h1>\n\n\n\n<p><code>java.util.concurrent.locks<\/code> \u63d0\u4f9b\u66f4\u7075\u6d3b\u7684\u540c\u6b65\u673a\u5236\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2714 \u793a\u4f8b\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.concurrent.locks.*;\n\nclass LockConditionExample {\n    private final Lock lock = new ReentrantLock();\n    private final Condition condition = lock.newCondition();\n\n    public void awaitMethod() throws InterruptedException {\n        lock.lock();\n        try {\n            condition.await();  \/\/ \u76f8\u5f53\u4e8e wait()\n        } finally {\n            lock.unlock();\n        }\n    }\n\n    public void signalMethod() {\n        lock.lock();\n        try {\n            condition.signal();  \/\/ \u76f8\u5f53\u4e8e notify()\n        } finally {\n            lock.unlock();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b98\u65b9\u6587\u6863\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/util\/concurrent\/locks\/Condition.html\"><code>Condition<\/code> interface &#8211; Java SE API docs<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/util\/concurrent\/locks\/ReentrantLock.html\"><code>ReentrantLock<\/code> &#8211; Java SE API docs<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u4e94\u3001\u5b98\u65b9\u63a8\u8350\u505a\u6cd5\u603b\u7ed3<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u65b9\u6cd5<\/th><th>\u662f\u5426\u5fc5\u987b\u540c\u6b65\uff1f<\/th><th>\u63a8\u8350\u65b9\u5f0f<\/th><th>\u53c2\u8003\u5b9e\u73b0<\/th><\/tr><\/thead><tbody><tr><td><code>wait()<\/code> \/ <code>notify()<\/code><\/td><td>\u2705 \u662f<\/td><td><code>synchronized<\/code> \u5757<\/td><td><code>synchronized(obj) { ... }<\/code><\/td><\/tr><tr><td><code>await()<\/code> \/ <code>signal()<\/code><\/td><td>\u2705 \u662f<\/td><td><code>Lock<\/code> + <code>Condition<\/code><\/td><td><code>lock.lock() {...}<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u516d\u3001\u603b\u7ed3\uff08\u9762\u8bd5 &amp; \u5b9e\u6218\u89d2\u5ea6\uff09<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u95ee\u9898<\/th><th>\u89e3\u7b54<\/th><\/tr><\/thead><tbody><tr><td>\u4e3a\u4ec0\u4e48 <code>wait()<\/code> \u5fc5\u987b\u5728\u540c\u6b65\u5757\u4e2d\uff1f<\/td><td>\u56e0\u4e3a\u53ea\u6709\u6301\u6709\u5bf9\u8c61\u76d1\u89c6\u5668\u7684\u7ebf\u7a0b\u624d\u53ef\u8c03\u7528\u5b83\uff0c\u5426\u5219 JVM \u629b\u5f02\u5e38\u3002<\/td><\/tr><tr><td>\u4e3a\u4ec0\u4e48\u8981\u8fd9\u6837\u8bbe\u8ba1\uff1f<\/td><td>\u907f\u514d\u7ade\u6001\u6761\u4ef6\u3001\u786e\u4fdd\u7ebf\u7a0b\u72b6\u6001\u4e00\u81f4\u6027\u3001\u5b89\u5168\u5730\u91ca\u653e\/\u7b49\u5f85\u9501\u3002<\/td><\/tr><tr><td>\u6709\u66ff\u4ee3\u65b9\u6848\u5417\uff1f<\/td><td>\u6709\uff0c<code>ReentrantLock<\/code> + <code>Condition<\/code> \u63d0\u4f9b\u66f4\u7cbe\u7ec6\u63a7\u5236\uff08\u591a\u4e2a\u6761\u4ef6\u961f\u5217\u7b49\uff09\u3002<\/td><\/tr><tr><td>\u5982\u679c\u4e0d\u7528 synchronized \u4f1a\u600e\u6837\uff1f<\/td><td>\u76f4\u63a5\u8fd0\u884c\u65f6\u62a5\u9519\uff1a<code>IllegalMonitorStateException<\/code>\uff0c\u7ebf\u7a0b\u65e0\u9501\u8c03\u7528\u662f\u4e0d\u5408\u6cd5\u7684\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u6838\u5fc3\u7ed3\u8bba\uff08\u5b98\u65b9\u5b9a\u4e49\uff09 Java \u4e2d\u7684 Object.wait()\u3001Object.notify() \u548c Ob [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3887,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-3889","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3889","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3889"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3889\/revisions"}],"predecessor-version":[{"id":3890,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3889\/revisions\/3890"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3887"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3889"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3889"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3889"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}