{"id":79735,"date":"2026-03-03T00:57:24","date_gmt":"2026-03-02T16:57:24","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/79735.html"},"modified":"2026-03-03T00:57:24","modified_gmt":"2026-03-02T16:57:24","slug":"%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90synchronized%e9%94%81%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/79735.html","title":{"rendered":"\u6df1\u5165\u89e3\u6790synchronized\u9501\u673a\u5236"},"content":{"rendered":"<p>\u597d\u7684&#xff0c;\u6211\u4eec\u5c06\u5206\u4e24\u8bfe\u65f6\u8be6\u7ec6\u8bb2\u89e3 synchronized \u5173\u952e\u5b57\u3002<\/p>\n<hr \/>\n<p>\u7b2c\u4e00\u8bfe\u65f6&#xff1a;\u57fa\u7840\u6982\u5ff5\u4e0e\u4f7f\u7528<\/p>\n<p>1. \u4ec0\u4e48\u662f\u540c\u6b65&#xff1f; \u5728\u591a\u7ebf\u7a0b\u7f16\u7a0b\u4e2d&#xff0c;\u591a\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u540c\u65f6\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90&#xff08;\u5982\u53d8\u91cf\u3001\u5bf9\u8c61&#xff09;&#xff0c;\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u6216\u7ade\u6001\u6761\u4ef6\u3002\u540c\u6b65\u673a\u5236\u7528\u4e8e\u534f\u8c03\u7ebf\u7a0b\u8bbf\u95ee&#xff0c;\u786e\u4fdd\u5171\u4eab\u8d44\u6e90\u5728\u4efb\u610f\u65f6\u523b\u53ea\u88ab\u4e00\u4e2a\u7ebf\u7a0b\u64cd\u4f5c\u3002<\/p>\n<p>2. synchronized \u7684\u4f5c\u7528<\/p>\n<ul>\n<li>\u539f\u5b50\u6027&#xff1a;\u786e\u4fdd\u64cd\u4f5c\u4e0d\u53ef\u5206\u5272\u3002<\/li>\n<li>\u53ef\u89c1\u6027&#xff1a;\u4e00\u4e2a\u7ebf\u7a0b\u4fee\u6539\u5171\u4eab\u53d8\u91cf\u540e&#xff0c;\u5176\u4ed6\u7ebf\u7a0b\u80fd\u7acb\u5373\u770b\u5230\u6700\u65b0\u503c\u3002<\/li>\n<li>\u6709\u5e8f\u6027&#xff1a;\u7981\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f&#xff08;\u901a\u8fc7 as-if-serial \u8bed\u4e49\u548c happens-before \u89c4\u5219&#xff09;\u3002<\/li>\n<\/ul>\n<p>3. \u4f7f\u7528\u65b9\u5f0f 3.1 \u4fee\u9970\u5b9e\u4f8b\u65b9\u6cd5<\/p>\n<p>public synchronized void method() {<br \/>\n    \/\/ \u4e34\u754c\u533a\u4ee3\u7801<br \/>\n}<\/p>\n<ul>\n<li>\u9501\u5bf9\u8c61\u662f\u5f53\u524d\u5b9e\u4f8b&#xff08;this&#xff09;\u3002<\/li>\n<li>\u540c\u4e00\u5b9e\u4f8b\u7684\u591a\u4e2a\u7ebf\u7a0b\u8c03\u7528\u6b64\u65b9\u6cd5\u4f1a\u4e92\u65a5\u3002<\/li>\n<\/ul>\n<p>3.2 \u4fee\u9970\u9759\u6001\u65b9\u6cd5<\/p>\n<p>public static synchronized void staticMethod() {<br \/>\n    \/\/ \u4e34\u754c\u533a\u4ee3\u7801<br \/>\n}<\/p>\n<ul>\n<li>\u9501\u5bf9\u8c61\u662f\u7c7b\u7684 Class \u5bf9\u8c61&#xff08;\u5982 MyClass.class&#xff09;\u3002<\/li>\n<li>\u6240\u6709\u5b9e\u4f8b\u7684\u7ebf\u7a0b\u8c03\u7528\u6b64\u65b9\u6cd5\u4f1a\u4e92\u65a5\u3002<\/li>\n<\/ul>\n<p>3.3 \u540c\u6b65\u4ee3\u7801\u5757<\/p>\n<p>public void method() {<br \/>\n    \/\/ \u975e\u540c\u6b65\u4ee3\u7801<br \/>\n    synchronized (lockObject) {<br \/>\n        \/\/ \u4e34\u754c\u533a\u4ee3\u7801<br \/>\n    }<br \/>\n}<\/p>\n<ul>\n<li>\u663e\u5f0f\u6307\u5b9a\u9501\u5bf9\u8c61&#xff08;lockObject&#xff09;&#xff0c;\u53ef\u4ee5\u662f\u4efb\u610f\u5bf9\u8c61\u3002<\/li>\n<li>\u7075\u6d3b\u6027\u9ad8&#xff0c;\u53ef\u7f29\u5c0f\u540c\u6b65\u8303\u56f4\u63d0\u5347\u6027\u80fd\u3002<\/li>\n<\/ul>\n<p>4. \u793a\u4f8b&#xff1a;\u8ba1\u6570\u5668<\/p>\n<p>public class Counter {<br \/>\n    private int count &#061; 0;<\/p>\n<p>    public synchronized void increment() {<br \/>\n        count&#043;&#043;; \/\/ \u539f\u5b50\u64cd\u4f5c<br \/>\n    }<\/p>\n<p>    public int getCount() {<br \/>\n        return count;<br \/>\n    }<br \/>\n}<\/p>\n<p>http:\/\/my.tv.sohu.com\/us\/442657988\/702996624.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjYyNC5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996731.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjczMS5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996629.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjYyOS5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996566.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjU2Ni5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996736.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjczNi5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996834.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjgzNC5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996573.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjU3My5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996576.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjU3Ni5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996635.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjYzNS5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996736.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjczNi5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996834.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjgzNC5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996573.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjU3My5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996576.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjU3Ni5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996635.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjYzNS5zaHRtbA&#061;&#061;.html<br \/>\n\u00a0<\/p>\n<ul>\n<li>\u4e0d\u52a0 synchronized \u65f6&#xff0c;\u591a\u7ebf\u7a0b\u5e76\u53d1 count&#043;&#043; \u4f1a\u5bfc\u81f4\u7ed3\u679c\u9519\u8bef\u3002<\/li>\n<\/ul>\n<hr \/>\n<p>\u7b2c\u4e8c\u8bfe\u65f6&#xff1a;\u5e95\u5c42\u539f\u7406\u4e0e\u9501\u4f18\u5316<\/p>\n<p>1. \u5bf9\u8c61\u5934\u4e0e\u9501\u6807\u8bb0 JVM \u4e2d\u6bcf\u4e2a\u5bf9\u8c61\u5305\u542b\u5bf9\u8c61\u5934&#xff08;\u5b58\u50a8 Mark Word&#xff09;&#xff0c;\u5176\u4e2d\u8bb0\u5f55\u9501\u72b6\u6001&#xff1a;<\/p>\n<ul>\n<li>\u65e0\u9501\u72b6\u6001<\/li>\n<li>\u504f\u5411\u9501<\/li>\n<li>\u8f7b\u91cf\u7ea7\u9501<\/li>\n<li>\u91cd\u91cf\u7ea7\u9501<\/li>\n<\/ul>\n<p>2. \u9501\u5347\u7ea7\u8fc7\u7a0b 2.1 \u504f\u5411\u9501<\/p>\n<ul>\n<li>\u9002\u7528\u4e8e\u5355\u7ebf\u7a0b\u91cd\u590d\u83b7\u53d6\u9501\u7684\u573a\u666f\u3002<\/li>\n<li>\u5728 Mark Word \u8bb0\u5f55\u7ebf\u7a0b ID&#xff0c;\u907f\u514d CAS \u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<p>2.2 \u8f7b\u91cf\u7ea7\u9501<\/p>\n<ul>\n<li>\u5f53\u591a\u7ebf\u7a0b\u7ade\u4e89\u65f6&#xff0c;\u5347\u7ea7\u4e3a\u8f7b\u91cf\u7ea7\u9501\u3002<\/li>\n<li>\u901a\u8fc7 CAS&#xff08;Compare-And-Swap&#xff09;\u5c1d\u8bd5\u83b7\u53d6\u9501\u3002<\/li>\n<li>\u82e5\u7ade\u4e89\u5931\u8d25&#xff0c;\u81a8\u80c0\u4e3a\u91cd\u91cf\u7ea7\u9501\u3002<\/li>\n<\/ul>\n<p>2.3 \u91cd\u91cf\u7ea7\u9501<\/p>\n<ul>\n<li>\u901a\u8fc7\u64cd\u4f5c\u7cfb\u7edf Mutex Lock \u5b9e\u73b0&#xff0c;\u7ebf\u7a0b\u963b\u585e\u5e76\u8fdb\u5165\u7b49\u5f85\u961f\u5217\u3002<\/li>\n<li>\u6d89\u53ca\u7528\u6237\u6001\u5230\u5185\u6838\u6001\u7684\u5207\u6362&#xff0c;\u5f00\u9500\u8f83\u5927\u3002<\/li>\n<\/ul>\n<p>3. \u9501\u7684\u5b58\u50a8\u7ed3\u6784<\/p>\n<ul>\n<li>\u9501\u5bf9\u8c61&#xff1a;synchronized \u4f5c\u7528\u7684\u5bf9\u8c61\u3002<\/li>\n<li>\u9501\u8bb0\u5f55&#xff08;Lock Record&#xff09;&#xff1a;\u5b58\u50a8\u5728\u6808\u5e27\u4e2d&#xff0c;\u7528\u4e8e\u4fdd\u5b58\u9501\u7684\u5143\u6570\u636e\u3002<\/li>\n<li>\u76d1\u89c6\u5668&#xff08;Monitor&#xff09;&#xff1a;JVM \u4e3a\u6bcf\u4e2a\u9501\u5bf9\u8c61\u5173\u8054\u7684\u540c\u6b65\u673a\u5236&#xff0c;\u5305\u542b&#xff1a;\n<ul>\n<li>_owner&#xff1a;\u6301\u6709\u9501\u7684\u7ebf\u7a0b\u3002<\/li>\n<li>_EntryList&#xff1a;\u7b49\u5f85\u83b7\u53d6\u9501\u7684\u7ebf\u7a0b\u961f\u5217\u3002<\/li>\n<li>_WaitSet&#xff1a;\u8c03\u7528 wait() \u7684\u7ebf\u7a0b\u961f\u5217\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>4. \u5b57\u8282\u7801\u5c42\u9762<\/p>\n<ul>\n<li>\u540c\u6b65\u4ee3\u7801\u5757\u7f16\u8bd1\u540e&#xff0c;\u63d2\u5165 monitorenter \u548c monitorexit \u6307\u4ee4&#xff1a;\n<p>public void method();<br \/>\n  Code:<br \/>\n     0: aload_0<br \/>\n     1: dup<br \/>\n     2: astore_1<br \/>\n     3: monitorenter  \/\/ \u83b7\u53d6\u9501<br \/>\n     4: aload_1<br \/>\n     5: monitorexit   \/\/ \u91ca\u653e\u9501<br \/>\n     6: goto          14<br \/>\n     9: astore_2<br \/>\n    10: aload_1<br \/>\n    11: monitorexit   \/\/ \u5f02\u5e38\u65f6\u91ca\u653e\u9501<br \/>\n    12: aload_2<br \/>\n    13: athrow<br \/>\n    14: return<\/p>\n<p>http:\/\/my.tv.sohu.com\/us\/442657988\/702996624.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjYyNC5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996731.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjczMS5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996629.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjYyOS5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996566.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjU2Ni5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996736.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjczNi5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996834.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjgzNC5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996573.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjU3My5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996576.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjU3Ni5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996635.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjYzNS5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996736.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjczNi5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996834.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjgzNC5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996573.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjU3My5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996576.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjU3Ni5zaHRtbA&#061;&#061;.html<br \/>\nhttp:\/\/my.tv.sohu.com\/us\/442657988\/702996635.shtml<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQyNjU3OTg4LzcwMjk5NjYzNS5zaHRtbA&#061;&#061;.html<br \/>\n\u00a0<\/p>\n<\/li>\n<\/ul>\n<p>5. \u9501\u4f18\u5316\u5efa\u8bae<\/p>\n<ul>\n<li>\u51cf\u5c0f\u540c\u6b65\u8303\u56f4&#xff1a;\u4f7f\u7528\u4ee3\u7801\u5757\u800c\u975e\u6574\u4e2a\u65b9\u6cd5\u3002<\/li>\n<li>\u964d\u4f4e\u9501\u7c92\u5ea6&#xff1a;\u5982 ConcurrentHashMap \u7684\u5206\u6bb5\u9501\u3002<\/li>\n<li>\u907f\u514d\u5d4c\u5957\u9501&#xff1a;\u9632\u6b62\u6b7b\u9501\u3002<\/li>\n<li>\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf&#xff1a;\u7ebf\u7a0b\u79c1\u6709&#xff0c;\u65e0\u9700\u540c\u6b65\u3002<\/li>\n<\/ul>\n<hr \/>\n<p>\u603b\u7ed3 synchronized \u662f Java 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