{"id":122,"date":"2021-09-17T16:01:53","date_gmt":"2021-09-17T08:01:53","guid":{"rendered":"https:\/\/blog.xiaotao2333.top:344\/?p=122"},"modified":"2021-09-25T14:34:48","modified_gmt":"2021-09-25T06:34:48","slug":"%e5%88%a9%e7%94%a8java%e7%9a%84synchronized%e5%85%b3%e9%94%ae%e5%ad%97%ef%bc%8cwait%e5%92%8cnotify%e6%96%b9%e6%b3%95%ef%bc%8c%e5%ae%9e%e7%8e%b0%e7%ae%80%e6%98%93%e9%98%bb%e5%a1%9e%e5%9e%8b%e6%b6%88","status":"publish","type":"post","link":"https:\/\/blog.xiaotao2333.top:344\/?p=122","title":{"rendered":"\u5229\u7528Java\u7684synchronized\u5173\u952e\u5b57\uff0cwait\u548cnotify\u65b9\u6cd5\uff0c\u5b9e\u73b0\u7b80\u6613\u963b\u585e\u578b\u6d88\u606f\u961f\u5217"},"content":{"rendered":"

\u5229\u7528Java\u7684synchronized\u5173\u952e\u5b57\uff0cwait\u548cnotify\u65b9\u6cd5\uff0c\u5b9e\u73b0\u7b80\u6613\u963b\u585e\u578b\u6d88\u606f\u961f\u5217<\/h1>\n
\n

\u524d\u8a00<\/h2>\n

wait\u548cnotify\u8fd9\u4e00\u5757\u5728\u521a\u521a\u5b66Java\u7684\u65f6\u5019\u5b66\u8fc7\uff0c\u4f46\u521d\u6b21\u63a5\u89e6\u5230\u73b0\u5728\u4e5f\u6709\u4e00\u4e24\u5e74\u4e86\uff0c\u8fc7\u4e8e\u4e45\u8fdc\uff0c\u800c\u4e14\u5e73\u65f6\u5f00\u53d1\u91cc\u4e5f\u51e0\u4e4e\u6ca1\u600e\u4e48\u7528\u5230wait\u548cnotify\uff0c\u7f3a\u5c11\u5b9e\u8df5\uff0c\u8fd1\u671f\u5728\u7814\u7a76\u9ad8\u5e76\u53d1\u7684\u7cfb\u7edf\u8bbe\u8ba1\uff0c\u4e13\u95e8\u7814\u7a76\u4e86\u4e0bJava\u7684\u9501\u548c\u4ee3\u7801\u540c\u6b65\u673a\u5236\uff0c\u987a\u4fbf\u8bb0\u5f55\u4e0b\u8fd9\u4e2a\u5b66\u4e60\u8fc7\u7a0b\u3002<\/p>\n

\u5f00\u59cb<\/h2>\n

\u91cd\u65b0\u8ba4\u8bc6synchronized<\/h3>\n

\u4e00\u5f00\u59cb\u5b66\u4e60Java\u65f6\u63a5\u89e6\u5230\u7684synchronized\u7528\u6cd5\u662f\u8fd9\u6837\u7684<\/p>\n

class \u7c7b\u540d {\n    public synchronized void \u65b9\u6cd5\u540d() {\n        \/\/ \u540c\u6b65\u4ee3\u7801\u5757\n    }\n}<\/code><\/pre>\n
\u8fd9\u6837\u5c31\u80fd\u4fdd\u8bc1\u4e86\u65b9\u6cd5\u53ea\u80fd\u540c\u65f6\u88ab1\u4e2a\u7ebf\u7a0b\u8c03\u7528\uff0c\u4e00\u5f00\u59cb\u4ee5\u4e3a\u53ea\u80fd\u8fd9\u6837\u7528\uff0c\u540e\u9762\u624d\u4e86\u89e3\u5230\u5176\u5b9e\u8fd8\u6709\u8fd9\u79cd\u5199\u6cd5\uff08\u6211\u592a\u83dc\u4e86\uff09<\/p>\n
class \u7c7b\u540d {\n    public void \u65b9\u6cd5\u540d() {\n        \/\/ \u8868\u793a\u83b7\u53d6\u5f53\u524d\u5bf9\u8c61\u5b9e\u4f8b\u7684\u9501\n        synchronized(this) {\n            \/\/ \u540c\u6b65\u4ee3\u7801\u5757\n        }\n    }\n}<\/code><\/pre>\n
\u5728\u65b9\u6cd5\u4f53\u4ee3\u7801\u5757\u5b9a\u4e49\u4e2d\uff0csynchronized<\/code>\u62ec\u53f7\u540e\u9762\u53ef\u4ee5\u8ddf\u4e0a\u4efb\u610fJava\u5bf9\u8c61\uff0c\u8868\u793a\u83b7\u53d6\u8be5\u5bf9\u8c61\u7684\u9501\uff0c\u82e5\u4f7f\u7528synchronized<\/code>\u4fee\u9970\u9759\u6001\u65b9\u6cd5\uff0c\u5219\u76f8\u5bf9\u4e8e\u83b7\u53d6\u8be5\u7c7b\uff08class\uff09\u7684\u9501\uff0c\u6548\u679c\u548c\u5982\u4e0b\u4ee3\u7801\u4e00\u81f4<\/p>\n
class Xx {\n    public static void \u65b9\u6cd5\u540d() {\n        synchronized(Xx.class) {\n            \/\/ \u540c\u6b65\u4ee3\u7801\u5757\n        }\n    }\n}<\/code><\/pre>\n
\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u51c6\u5907\u8fdb\u5165synchronized<\/code>\u4ee3\u7801\u5757\u65f6\uff0c\u82e5\u65e0\u6cd5\u83b7\u5f97\u5230\u9501\uff0c\u5219\u65b9\u6cd5\u6267\u884c\u4f1a\u53d1\u751f\u963b\u585e\uff0c\u76f4\u5230\u9501\u88ab\u5176\u4ed6\u7ebf\u7a0b\u91ca\u653e\uff0c\u5f53\u524d\u7ebf\u7a0b\u624d\u80fd\u62ff\u5230\u9501\uff0c\u8fdb\u5165\u540c\u6b65\u4ee3\u7801\u5757\uff0c\u89e3\u9664\u9501\u5bfc\u81f4\u7684\u8fd0\u884c\u963b\u585e\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662fJavasynchronized<\/code>\u5173\u952e\u5b57\u7684\u7b80\u5355\u4f7f\u7528\u65b9\u6cd5\uff0c\u53ef\u4ee5\u8bf4\u662f\u6bd4\u8f83\u65b9\u4fbf\u7684API\u4e86\uff0c\u4e0d\u9700\u8981\u81ea\u5df1\u624b\u52a8\u4e0a\u9501\u89e3\u9501\uff0c\u81f3\u4e8e\u8fd9\u4e2a\u5173\u952e\u5b57\u7684\u5177\u4f53\u5b9e\u73b0\u539f\u7406\u548c\u4e0d\u540c\u7ade\u4e89\u6761\u4ef6\u4e0b\u7684\u9501\u5347\u7ea7\u4e4b\u7c7b\u7684\u7279\u6027\uff0c\u6709\u7a7a\u518d\u4e13\u95e8\u7814\u7a76\u548c\u5199\u4e00\u7bc7\u6587\u7ae0\u3002<\/p>\n
wait()\u548csleep()<\/h3>\n
\u524d\u9762synchronized\u5173\u952e\u5b57\u7684\u7528\u6cd5\u8bb2\u5b8c\u4e86\uff0c\u8be5\u8f6e\u5230wait\u548csleep\u4e86\u3002\u53ef\u80fd\u4f1a\u6709\u70b9\u597d\u5947\uff0c\u4e3a\u4ec0\u4e48wait\u548csleep\u8981\u4e00\u5757\u8bb2\uff1f\u56e0\u4e3a\u6211\u4e00\u5f00\u59cb\u4e5f\u641e\u4e0d\u61c2\u4ed6\u4eec\u7684\u533a\u522b\uff0c\u53ea\u77e5\u9053wait()\u662fObject\u7c7b\u7684\u5b9e\u4f8b\u65b9\u6cd5\uff0csleep()\u662fThread\u7c7b\u7684\u5b9e\u4f8b\u65b9\u6cd5\u3002\u4f5c\u7528\u90fd\u662f\u4f7f\u8ba9\u4ee3\u7801\u505c\u4e0b\u6765\u3002<\/p>\n
\u4f46\u540e\u6765\u7814\u7a76\u4e86\u4e0b\uff0c\u4e24\u8005\u4f7f\u7528\u8d77\u6765\u8fd8\u662f\u6709\u4e00\u5b9a\u7684\u5dee\u522b\u7684\u3002<\/p>\n
\u9996\u5148\uff0cwait\u5fc5\u987b\u8981\u5728\u83b7\u5f97\u4e86\u5f53\u524d\u5bf9\u8c61\u7684\u5bf9\u8c61\u9501\u4ee3\u7801\u5757\u4e2d\u6267\u884c\uff08\u53ef\u4ee5\u7406\u89e3\u4e3a\u8c03\u7528\u54ea\u4e2a\u5bf9\u8c61\u7684wait\u65b9\u6cd5\uff0c\u8c03\u7528\u7684\u65f6\u5019\u5c31\u8981\u5904\u4e8e\u54ea\u4e2a\u5bf9\u8c61\u7684\u540c\u6b65\u4ee3\u7801\u5757\u4e2d\uff09\uff0c\u800csleep\u5219\u6ca1\u6709\u8fd9\u4e2a\u9650\u5236\u3002<\/p>\n
public synchronized void methodName() {\n    this.wait(); \/\/\u53ef\u4ee5 \u6ca1\u95ee\u9898\n}\n\npublic void methodName() {\n    this.wait(); \/\/\u4e0d\u53ef\u4ee5\uff0c\u6ca1\u6709\u5904\u4e8ethis\u7684\u540c\u6b65\u4ee3\u7801\u5757\u4e2d\uff0c\u629b\u51faIllegalMonitorStateException\n}\n\npublic void methodName2() {\n    synchronized(\u5176\u4ed6\u5bf9\u8c61) {\n        this.wait() \/\/ \u4e0d\u53ef\u4ee5\uff0c\u8fd9\u91cc\u53ea\u83b7\u5f97\u4e86\u5176\u4ed6\u5bf9\u8c61\u7684\u9501\uff0c\u4f46\u662f\u5374\u8c03\u7528\u4e86this\u7684wait\uff0c\u629b\u51faIllegalMonitorStateException\n    }\n}\n\npublic void methodName3() {\n    synchronized(\u5176\u4ed6\u5bf9\u8c61) {\n        \u5176\u4ed6\u5bf9\u8c61.wait() \/\/ \u53ef\u4ee5\uff0c\u6ca1\u95ee\u9898\uff0c\u4e0d\u4e00\u5b9a\u975e\u5f97\u662fthis\n    }\n}<\/code><\/pre>\n
\u4e5f\u8bb8\u4f60\u6ce8\u610f\u5230\u4e86\uff0cwait()\u5fc5\u987b\u914d\u5408synchronized\u4f7f\u7528\uff1f\u4e3a\u4ec0\u4e48\u5462\uff1f\u90a3\u5c31\u662fwait()\u6709\u4e2a\u5f88\u6709\u610f\u601d\u7684\u7279\u6027\uff0c\u6267\u884cwait()\u540e\u7684\u7761\u7720\u671f\u95f4\uff0c\u4f1a\u91ca\u653e\u6389\u901a\u8fc7synchronized\u83b7\u5f97\u7684\u9501\uff0c\u76f4\u5230\u88ab\u5524\u9192\u7684\u65f6\u5019\u4f1a\u91cd\u65b0\u83b7\u5f97\u9501<\/strong>\uff0c\u800csleep()\u4f1a\u5728\u7ebf\u7a0b\u7761\u7720\u671f\u95f4\u4f9d\u7136\u6301\u6709\u8fd9\u4e2a\u9501\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u540c\u6b65\u4ee3\u7801\u5757\u4e2d\u7528wait()\u7761\u7720\u540e\uff0c\u5176\u4ed6\u7ebf\u7a0b\u4e5f\u80fd\u591f\u83b7\u5f97\u5bf9\u8c61\u7684\u9501\u3002<\/p>\n
wait()\u7684\u7761\u7720\u72b6\u6001\u88abnotity()\u6216notifyAll()\u5524\u9192\u65f6\uff0c\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\uff0csleep()\u5bfc\u81f4\u7684\u7761\u7720\u53ea\u80fd\u88abinterrupt()\u65b9\u6cd5\u5524\u9192\uff0c\u540c\u65f6sleep()\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u82e5interrupt()\u5524\u9192\u7684\u662f\u7531wait()\u5bfc\u81f4\u7684\u7761\u7720\uff0cwait()\u540c\u6837\u4f1a\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n
\u540c\u65f6\uff0c\u7531\u4e8ewait()\u4f1a\u91ca\u653e\u6389\u9501\uff0c\u56e0\u6b64\u4e00\u4e2a\u5bf9\u8c61\u4e2d\u53ef\u80fd\u4f1a\u540c\u65f6\u5b58\u5728\u591a\u4e2a\u7ebf\u7a0b\u7531\u4e8ewait()\u5bfc\u81f4\u7684\u7761\u7720<\/p>\n
notify()\u4e0enotifyAll()<\/h3>\n
notify()\u4f1a\u5c06\u5bf9\u8c61\u7684\u4e00\u4e2a\u7ebf\u7a0b\u4ecewait()\u5bfc\u81f4\u7684\u7761\u7720\u72b6\u6001\u4e2d\u5524\u9192\uff0c\u81f3\u4e8e\u662f\u54ea\u4e2a\u7ebf\u7a0b\uff0c\u5219\u662f\u968f\u673a\u7684\u3002<\/p>\n
\u800cnotifyAll()\u5219\u662f\u5524\u9192\u5bf9\u8c61\u6240\u6709\u7531\u4e8ewait()\u5bfc\u81f4\u7684\u7761\u7720\u3002\u7531\u4e8ewait()\u88ab\u5524\u9192\u540e\u4f1a\u5bf9\u5bf9\u8c61\u52a0\u9501\uff0c\u5982\u679c\u6ca1\u80fd\u62ff\u5230\u9501\u4f1a\u6682\u65f6\u5148\u963b\u585e\u7740\u76f4\u5230\u6709\u673a\u4f1a\u62ff\u5230\u9501\uff0c\u56e0\u6b64\u4f9d\u7136\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/p>\n
\u7b80\u6613\u6d88\u606f\u961f\u5217\u7684\u5b9e\u73b0<\/h3>\n
\u73b0\u5728\u5c31\u5229\u7528\u4e0a\u9762\u7684\u7279\u6027\uff0c\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u963b\u585e\u578b\u6d88\u606f\u961f\u5217\u5427\u3002<\/p>\n
\u6d88\u606f\u961f\u5217\u662f\u4e00\u4e2a\u5178\u578b\u7684\u6d88\u8d39\u8005-\u751f\u4ea7\u8005\u6a21\u578b\uff0c\u5f53\u6d88\u8d39\u8005\u6d88\u8d39\u65f6\uff0c\u82e5\u6d88\u606f\u961f\u5217\u4e3a\u7a7a\uff0c\u5219\u4e00\u76f4\u7b49\u5f85\uff08\u963b\u585e\u6267\u884c\uff09\uff0c\u76f4\u5230\u751f\u4ea7\u8005\u751f\u4ea7\u4e86\u4e00\u4e2a\u6d88\u606f\uff0c\u6b64\u65f6\u6d88\u8d39\u8005\u963b\u585e\u6d88\u9664\u5e76\u83b7\u5f97\u4e00\u4e2a\u6d88\u606f<\/p>\n
\u8fd9\u91cc\u963b\u585e\u7684\u5173\u952e\u662f\u961f\u5217\u7a7a\u65f6\u7b49\u5f85\uff0c\u975e\u7a7a\u65f6\u5524\u9192<\/p>\n
\u6d88\u606f\u961f\u5217\u7c7b\u5b8c\u6574\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\/**\n * \u4f7f\u7528\u9501\u5b9e\u73b0\u7684\u6d88\u606f\u961f\u5217\n *\/\nclass MessageQueue {\n    \/\/ \u961f\u5217\u5173\u95ed\u6807\u5fd7\n    private volatile boolean stop = false;\n    \/\/ \u4f7f\u7528\u94fe\u8868\u4f5c\u4e3a\u6d88\u606f\u5bb9\u5668\n    private final LinkedList<String> queue = new LinkedList<>();\n    \/**\n     * \u751f\u4ea7\u6d88\u606f\n     * @param msg   \u6d88\u606f\u5185\u5bb9\n     *\/\n    public void product(String msg) {\n        \/\/ \u83b7\u53d6\u94fe\u8868\u7684\u9501\u4e4b\u540e\uff0c\u5411\u94fe\u8868\u6dfb\u52a0\u6d88\u606f\uff0c\u6700\u540e\u5c1d\u8bd5\u5524\u9192\u94fe\u8868\u5bf9\u8c61\uff08\u5982\u679c\u5728\u7b49\u5f85\u7684\u8bdd\uff09\n        synchronized (this) {\n            if (stop) {\n                throw new IllegalStateException("\u6d88\u606f\u961f\u5217\u5df2\u5173\u95ed");\n            }\n            queue.add(msg);\n            this.notify();\n        }\n    }\n    \/**\n     * \u5173\u95ed\u6d88\u606f\u961f\u5217\uff0c\u5e76\u5524\u9192\u6d88\u8d39\u8005\u7684\u7b49\u5f85\uff08\u5982\u679c\u5728\u7b49\u5f85\u7684\u8bdd\uff09\n     *\/\n    public void stop() {\n        synchronized (this) {\n            stop = true;\n            this.notify();\n        }\n    }\n    \/**\n     * \u6d88\u8d39\u6d88\u606f\uff0c\u82e5\u65e0\u6d88\u606f\u5c06\u4f1a\u4e00\u76f4\u963b\u585e\uff0c\u76f4\u5230\u6709\u6d88\u606f\u6216\u961f\u5217\u5173\u95ed\uff0c\u82e5\u6d88\u606f\u961f\u5217\u5df2\u5173\u95ed\u5219\u4e0d\u518d\u963b\u585e\u4e14\u8fd4\u56denull\n     * @return \u62ff\u5230\u7684\u6d88\u606f\n     *\/\n    public String consume() {\n        \/\/ \u83b7\u53d6\u5bf9\u8c61\u7684\u9501\n        synchronized (this) {\n            if (queue.size() != 0) {\n                return queue.remove();\n            } else {\n                while (!stop && queue.size() == 0) {\n                    try {\n                        this.wait();\n                    } catch (InterruptedException ignored) { }\n                }\n\n                \/\/ \u7531\u4e8e\u5173\u95ed\u961f\u5217\u4e5f\u6709\u53ef\u80fd\u9000\u51fa\u4e0a\u9762\u7684\u5faa\u73af\uff0c\u6240\u4ee5\u8981\u518d\u5224\u65ad\u4e00\u6b21\u957f\u5ea6\n                if (queue.size() == 0) {\n                    return null;\n                } else {\n                    return queue.remove();\n                }\n            }\n        }\n    }\n}\n<\/code><\/pre>\n
\u6d4b\u8bd5\u4ee3\u7801\u5982\u4e0b<\/p>\n
public class Main {\n    public static void main(String[] args) throws InterruptedException {\n        MessageQueue mq = new MessageQueue();\n\n        \/\/ \u5f001\u4e2a\u7ebf\u7a0b\u6d88\u8d39\u6d88\u606f\n        new Thread(() -> {\n           while (true) {\n               String msg = mq.consume();\n               System.out.println("\u6d88\u8d39\u6d88\u606f\uff1a" + msg);\n               if (msg == null) {\n                   System.out.println("\u961f\u5217\u5173\u95ed");\n                   break;\n               }\n           }\n        }).start();\n        for (int i = 0; i < 10; i++) {\n            mq.product("" + i);\n            System.out.println("\u751f\u4ea7\u6d88\u606f\uff1a" + i);\n            Thread.sleep(100);\n        }\n        mq.stop();\n        Thread.sleep(1000);\n        System.out.println("\u4e3b\u7ebf\u7a0b\u7ed3\u675f");\n    }\n}<\/code><\/pre>\n
\u8fd0\u884c\u53ef\u4ee5\u89c2\u5bdf\u5230\u6bcf0.1\u79d2\u751f\u4ea7\u4e00\u4e2a\u6d88\u606f\uff0c\u7d27\u63a5\u7740\u5c31\u88ab\u6d88\u8d39\uff0c\u6700\u540e\u7a0b\u5e8f\u9000\u51fa\u3002<\/p>\n
\u6027\u80fd<\/h3>\n
\u6d88\u8d39\u65b9\u6cd5\u591a\u6b21\u5224\u65adsize()\uff0c\u4ee3\u7801\u540c\u6b65\u7b80\u5355\u7c97\u66b4\u3002\u6027\u80fd\u5e94\u8be5\u4e0d\u548b\u5730\uff0c\u540e\u9762\u6709\u7a7a\u518d\u7814\u7a76\u9ad8\u6027\u80fd\u5e76\u53d1\u961f\u5217\u7684\u5b9e\u73b0\uff08\u5f53\u7136jdk\u7c7b\u5e93\u91cc\u4e5f\u6709\u76f8\u5173\u5b9e\u73b0\uff09\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5229\u7528Java\u7684synchronized\u5173\u952e\u5b57\uff0cwait\u548cnotify\u65b9\u6cd5\uff0c\u5b9e\u73b0\u7b80\u6613\u963b\u585e\u578b\u6d88\u606f\u961f\u5217 \u524d\u8a00 wai […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[21,24],"tags":[22,32,33,31],"_links":{"self":[{"href":"https:\/\/blog.xiaotao2333.top:344\/index.php?rest_route=\/wp\/v2\/posts\/122"}],"collection":[{"href":"https:\/\/blog.xiaotao2333.top:344\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.xiaotao2333.top:344\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.xiaotao2333.top:344\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.xiaotao2333.top:344\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=122"}],"version-history":[{"count":10,"href":"https:\/\/blog.xiaotao2333.top:344\/index.php?rest_route=\/wp\/v2\/posts\/122\/revisions"}],"predecessor-version":[{"id":140,"href":"https:\/\/blog.xiaotao2333.top:344\/index.php?rest_route=\/wp\/v2\/posts\/122\/revisions\/140"}],"wp:attachment":[{"href":"https:\/\/blog.xiaotao2333.top:344\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=122"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.xiaotao2333.top:344\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=122"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.xiaotao2333.top:344\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}