{"id":457,"date":"2019-02-27T11:07:36","date_gmt":"2019-02-27T03:07:36","guid":{"rendered":"https:\/\/fick707.com\/?p=457"},"modified":"2019-02-27T11:08:31","modified_gmt":"2019-02-27T03:08:31","slug":"java-lock-types","status":"publish","type":"post","link":"https:\/\/fick707.com\/?p=457","title":{"rendered":"java \u9501\u7684\u5206\u7c7b"},"content":{"rendered":"<p>\u8f6c\u8f7d\u81ea\uff1ahttps:\/\/www.cnblogs.com\/qifengshi\/p\/6831055.html\uff0c\u611f\u8c22\u539f\u4f5c\u8005<\/p>\n<p>\u5728\u8bfb\u5f88\u591a\u5e76\u53d1\u6587\u7ae0\u4e2d\uff0c\u4f1a\u63d0\u53ca\u5404\u79cd\u5404\u6837\u9501\u5982\u516c\u5e73\u9501\uff0c\u4e50\u89c2\u9501\u7b49\u7b49\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4ecb\u7ecd\u5404\u79cd\u9501\u7684\u5206\u7c7b\u3002\u4ecb\u7ecd\u7684\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u516c\u5e73\u9501\/\u975e\u516c\u5e73\u9501<\/li>\n<li>\u53ef\u91cd\u5165\u9501<\/li>\n<li>\u72ec\u4eab\u9501\/\u5171\u4eab\u9501<\/li>\n<li>\u4e92\u65a5\u9501\/\u8bfb\u5199\u9501<\/li>\n<li>\u4e50\u89c2\u9501\/\u60b2\u89c2\u9501<\/li>\n<li>\u5206\u6bb5\u9501<\/li>\n<li>\u504f\u5411\u9501\/\u8f7b\u91cf\u7ea7\u9501\/\u91cd\u91cf\u7ea7\u9501<\/li>\n<li>\u81ea\u65cb\u9501<\/li>\n<\/ul>\n<p>\u4e0a\u9762\u662f\u5f88\u591a\u9501\u7684\u540d\u8bcd\uff0c\u8fd9\u4e9b\u5206\u7c7b\u5e76\u4e0d\u662f\u5168\u662f\u6307\u9501\u7684\u72b6\u6001\uff0c\u6709\u7684\u6307\u9501\u7684\u7279\u6027\uff0c\u6709\u7684\u6307\u9501\u7684\u8bbe\u8ba1\uff0c\u4e0b\u9762\u603b\u7ed3\u7684\u5185\u5bb9\u662f\u5bf9\u6bcf\u4e2a\u9501\u7684\u540d\u8bcd\u8fdb\u884c\u4e00\u5b9a\u7684\u89e3\u91ca\u3002<\/p>\n<h2 id=\"\u516c\u5e73\u9501\u975e\u516c\u5e73\u9501\">\u516c\u5e73\u9501\/\u975e\u516c\u5e73\u9501<\/h2>\n<p>\u516c\u5e73\u9501\u662f\u6307\u591a\u4e2a\u7ebf\u7a0b\u6309\u7167\u7533\u8bf7\u9501\u7684\u987a\u5e8f\u6765\u83b7\u53d6\u9501\u3002<br \/>\n\u975e\u516c\u5e73\u9501\u662f\u6307\u591a\u4e2a\u7ebf\u7a0b\u83b7\u53d6\u9501\u7684\u987a\u5e8f\u5e76\u4e0d\u662f\u6309\u7167\u7533\u8bf7\u9501\u7684\u987a\u5e8f\uff0c\u6709\u53ef\u80fd\u540e\u7533\u8bf7\u7684\u7ebf\u7a0b\u6bd4\u5148\u7533\u8bf7\u7684\u7ebf\u7a0b\u4f18\u5148\u83b7\u53d6\u9501\u3002\u6709\u53ef\u80fd\uff0c\u4f1a\u9020\u6210\u4f18\u5148\u7ea7\u53cd\u8f6c\u6216\u8005\u9965\u997f\u73b0\u8c61\u3002<br \/>\n\u5bf9\u4e8eJava\u00a0<code>ReentrantLock<\/code>\u800c\u8a00\uff0c\u901a\u8fc7\u6784\u9020\u51fd\u6570\u6307\u5b9a\u8be5\u9501\u662f\u5426\u662f\u516c\u5e73\u9501\uff0c\u9ed8\u8ba4\u662f\u975e\u516c\u5e73\u9501\u3002\u975e\u516c\u5e73\u9501\u7684\u4f18\u70b9\u5728\u4e8e\u541e\u5410\u91cf\u6bd4\u516c\u5e73\u9501\u5927\u3002<br \/>\n\u5bf9\u4e8e<code>Synchronized<\/code>\u800c\u8a00\uff0c\u4e5f\u662f\u4e00\u79cd\u975e\u516c\u5e73\u9501\u3002\u7531\u4e8e\u5176\u5e76\u4e0d\u50cf<code>ReentrantLock<\/code>\u662f\u901a\u8fc7AQS\u7684\u6765\u5b9e\u73b0\u7ebf\u7a0b\u8c03\u5ea6\uff0c\u6240\u4ee5\u5e76\u6ca1\u6709\u4efb\u4f55\u529e\u6cd5\u4f7f\u5176\u53d8\u6210\u516c\u5e73\u9501\u3002<\/p>\n<h2 id=\"\u53ef\u91cd\u5165\u9501\">\u53ef\u91cd\u5165\u9501<\/h2>\n<p>\u53ef\u91cd\u5165\u9501\u53c8\u540d\u9012\u5f52\u9501\uff0c\u662f\u6307\u5728\u540c\u4e00\u4e2a\u7ebf\u7a0b\u5728\u5916\u5c42\u65b9\u6cd5\u83b7\u53d6\u9501\u7684\u65f6\u5019\uff0c\u5728\u8fdb\u5165\u5185\u5c42\u65b9\u6cd5\u4f1a\u81ea\u52a8\u83b7\u53d6\u9501\u3002\u8bf4\u7684\u6709\u70b9\u62bd\u8c61\uff0c\u4e0b\u9762\u4f1a\u6709\u4e00\u4e2a\u4ee3\u7801\u7684\u793a\u4f8b\u3002<br \/>\n\u5bf9\u4e8eJava\u00a0<code>ReentrantLock<\/code>\u800c\u8a00, \u4ed6\u7684\u540d\u5b57\u5c31\u53ef\u4ee5\u770b\u51fa\u662f\u4e00\u4e2a\u53ef\u91cd\u5165\u9501\uff0c\u5176\u540d\u5b57\u662f<code>Re entrant Lock<\/code>\u91cd\u65b0\u8fdb\u5165\u9501\u3002<br \/>\n\u5bf9\u4e8e<code>Synchronized<\/code>\u800c\u8a00,\u4e5f\u662f\u4e00\u4e2a\u53ef\u91cd\u5165\u9501\u3002\u53ef\u91cd\u5165\u9501\u7684\u4e00\u4e2a\u597d\u5904\u662f\u53ef\u4e00\u5b9a\u7a0b\u5ea6\u907f\u514d\u6b7b\u9501\u3002<\/p>\n<pre><code class=\"hljs java\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">synchronized<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">setA<\/span><span class=\"hljs-params\">()<\/span> <span class=\"hljs-keyword\">throws<\/span> Exception<\/span>{\n    Thread.sleep(<span class=\"hljs-number\">1000<\/span>);\n    setB();\n}\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">synchronized<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">setB<\/span><span class=\"hljs-params\">()<\/span> <span class=\"hljs-keyword\">throws<\/span> Exception<\/span>{\n    Thread.sleep(<span class=\"hljs-number\">1000<\/span>);\n}<\/code><\/pre>\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u5c31\u662f\u4e00\u4e2a\u53ef\u91cd\u5165\u9501\u7684\u4e00\u4e2a\u7279\u70b9\uff0c\u5982\u679c\u4e0d\u662f\u53ef\u91cd\u5165\u9501\u7684\u8bdd\uff0csetB\u53ef\u80fd\u4e0d\u4f1a\u88ab\u5f53\u524d\u7ebf\u7a0b\u6267\u884c\uff0c\u53ef\u80fd\u9020\u6210\u6b7b\u9501\u3002<\/p>\n<h2 id=\"\u72ec\u4eab\u9501\u5171\u4eab\u9501\">\u72ec\u4eab\u9501\/\u5171\u4eab\u9501<\/h2>\n<p>\u72ec\u4eab\u9501\u662f\u6307\u8be5\u9501\u4e00\u6b21\u53ea\u80fd\u88ab\u4e00\u4e2a\u7ebf\u7a0b\u6240\u6301\u6709\u3002<br \/>\n\u5171\u4eab\u9501\u662f\u6307\u8be5\u9501\u53ef\u88ab\u591a\u4e2a\u7ebf\u7a0b\u6240\u6301\u6709\u3002<\/p>\n<p>\u5bf9\u4e8eJava\u00a0<code>ReentrantLock<\/code>\u800c\u8a00\uff0c\u5176\u662f\u72ec\u4eab\u9501\u3002\u4f46\u662f\u5bf9\u4e8eLock\u7684\u53e6\u4e00\u4e2a\u5b9e\u73b0\u7c7b<code>ReadWriteLock<\/code>\uff0c\u5176\u8bfb\u9501\u662f\u5171\u4eab\u9501\uff0c\u5176\u5199\u9501\u662f\u72ec\u4eab\u9501\u3002<br \/>\n\u8bfb\u9501\u7684\u5171\u4eab\u9501\u53ef\u4fdd\u8bc1\u5e76\u53d1\u8bfb\u662f\u975e\u5e38\u9ad8\u6548\u7684\uff0c\u8bfb\u5199\uff0c\u5199\u8bfb \uff0c\u5199\u5199\u7684\u8fc7\u7a0b\u662f\u4e92\u65a5\u7684\u3002<br \/>\n\u72ec\u4eab\u9501\u4e0e\u5171\u4eab\u9501\u4e5f\u662f\u901a\u8fc7AQS\u6765\u5b9e\u73b0\u7684\uff0c\u901a\u8fc7\u5b9e\u73b0\u4e0d\u540c\u7684\u65b9\u6cd5\uff0c\u6765\u5b9e\u73b0\u72ec\u4eab\u6216\u8005\u5171\u4eab\u3002<br \/>\n\u5bf9\u4e8e<code>Synchronized<\/code>\u800c\u8a00\uff0c\u5f53\u7136\u662f\u72ec\u4eab\u9501\u3002<\/p>\n<h2 id=\"\u4e92\u65a5\u9501\u8bfb\u5199\u9501\">\u4e92\u65a5\u9501\/\u8bfb\u5199\u9501<\/h2>\n<p>\u4e0a\u9762\u8bb2\u7684\u72ec\u4eab\u9501\/\u5171\u4eab\u9501\u5c31\u662f\u4e00\u79cd\u5e7f\u4e49\u7684\u8bf4\u6cd5\uff0c\u4e92\u65a5\u9501\/\u8bfb\u5199\u9501\u5c31\u662f\u5177\u4f53\u7684\u5b9e\u73b0\u3002<br \/>\n\u4e92\u65a5\u9501\u5728Java\u4e2d\u7684\u5177\u4f53\u5b9e\u73b0\u5c31\u662f<code>ReentrantLock<\/code><br \/>\n\u8bfb\u5199\u9501\u5728Java\u4e2d\u7684\u5177\u4f53\u5b9e\u73b0\u5c31\u662f<code>ReadWriteLock<\/code><\/p>\n<h2 id=\"\u4e50\u89c2\u9501\u60b2\u89c2\u9501\">\u4e50\u89c2\u9501\/\u60b2\u89c2\u9501<\/h2>\n<p>\u4e50\u89c2\u9501\u4e0e\u60b2\u89c2\u9501\u4e0d\u662f\u6307\u5177\u4f53\u7684\u4ec0\u4e48\u7c7b\u578b\u7684\u9501\uff0c\u800c\u662f\u6307\u770b\u5f85\u5e76\u53d1\u540c\u6b65\u7684\u89d2\u5ea6\u3002<br \/>\n\u60b2\u89c2\u9501\u8ba4\u4e3a\u5bf9\u4e8e\u540c\u4e00\u4e2a\u6570\u636e\u7684\u5e76\u53d1\u64cd\u4f5c\uff0c\u4e00\u5b9a\u662f\u4f1a\u53d1\u751f\u4fee\u6539\u7684\uff0c\u54ea\u6015\u6ca1\u6709\u4fee\u6539\uff0c\u4e5f\u4f1a\u8ba4\u4e3a\u4fee\u6539\u3002\u56e0\u6b64\u5bf9\u4e8e\u540c\u4e00\u4e2a\u6570\u636e\u7684\u5e76\u53d1\u64cd\u4f5c\uff0c\u60b2\u89c2\u9501\u91c7\u53d6\u52a0\u9501\u7684\u5f62\u5f0f\u3002\u60b2\u89c2\u7684\u8ba4\u4e3a\uff0c\u4e0d\u52a0\u9501\u7684\u5e76\u53d1\u64cd\u4f5c\u4e00\u5b9a\u4f1a\u51fa\u95ee\u9898\u3002<br \/>\n\u4e50\u89c2\u9501\u5219\u8ba4\u4e3a\u5bf9\u4e8e\u540c\u4e00\u4e2a\u6570\u636e\u7684\u5e76\u53d1\u64cd\u4f5c\uff0c\u662f\u4e0d\u4f1a\u53d1\u751f\u4fee\u6539\u7684\u3002\u5728\u66f4\u65b0\u6570\u636e\u7684\u65f6\u5019\uff0c\u4f1a\u91c7\u7528\u5c1d\u8bd5\u66f4\u65b0\uff0c\u4e0d\u65ad\u91cd\u65b0\u7684\u65b9\u5f0f\u66f4\u65b0\u6570\u636e\u3002\u4e50\u89c2\u7684\u8ba4\u4e3a\uff0c\u4e0d\u52a0\u9501\u7684\u5e76\u53d1\u64cd\u4f5c\u662f\u6ca1\u6709\u4e8b\u60c5\u7684\u3002<\/p>\n<p>\u4ece\u4e0a\u9762\u7684\u63cf\u8ff0\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff0c\u60b2\u89c2\u9501\u9002\u5408\u5199\u64cd\u4f5c\u975e\u5e38\u591a\u7684\u573a\u666f\uff0c\u4e50\u89c2\u9501\u9002\u5408\u8bfb\u64cd\u4f5c\u975e\u5e38\u591a\u7684\u573a\u666f\uff0c\u4e0d\u52a0\u9501\u4f1a\u5e26\u6765\u5927\u91cf\u7684\u6027\u80fd\u63d0\u5347\u3002<br \/>\n\u60b2\u89c2\u9501\u5728Java\u4e2d\u7684\u4f7f\u7528\uff0c\u5c31\u662f\u5229\u7528\u5404\u79cd\u9501\u3002<br \/>\n\u4e50\u89c2\u9501\u5728Java\u4e2d\u7684\u4f7f\u7528\uff0c\u662f\u65e0\u9501\u7f16\u7a0b\uff0c\u5e38\u5e38\u91c7\u7528\u7684\u662fCAS\u7b97\u6cd5\uff0c\u5178\u578b\u7684\u4f8b\u5b50\u5c31\u662f\u539f\u5b50\u7c7b\uff0c\u901a\u8fc7CAS\u81ea\u65cb\u5b9e\u73b0\u539f\u5b50\u64cd\u4f5c\u7684\u66f4\u65b0\u3002<\/p>\n<h2 id=\"\u5206\u6bb5\u9501\">\u5206\u6bb5\u9501<\/h2>\n<p>\u5206\u6bb5\u9501\u5176\u5b9e\u662f\u4e00\u79cd\u9501\u7684\u8bbe\u8ba1\uff0c\u5e76\u4e0d\u662f\u5177\u4f53\u7684\u4e00\u79cd\u9501\uff0c\u5bf9\u4e8e<code>ConcurrentHashMap<\/code>\u800c\u8a00\uff0c\u5176\u5e76\u53d1\u7684\u5b9e\u73b0\u5c31\u662f\u901a\u8fc7\u5206\u6bb5\u9501\u7684\u5f62\u5f0f\u6765\u5b9e\u73b0\u9ad8\u6548\u7684\u5e76\u53d1\u64cd\u4f5c\u3002<br \/>\n\u6211\u4eec\u4ee5<code>ConcurrentHashMap<\/code>\u6765\u8bf4\u4e00\u4e0b\u5206\u6bb5\u9501\u7684\u542b\u4e49\u4ee5\u53ca\u8bbe\u8ba1\u601d\u60f3\uff0c<code>ConcurrentHashMap<\/code>\u4e2d\u7684\u5206\u6bb5\u9501\u79f0\u4e3aSegment\uff0c\u5b83\u5373\u7c7b\u4f3c\u4e8eHashMap\uff08JDK7\u4e0eJDK8\u4e2dHashMap\u7684\u5b9e\u73b0\uff09\u7684\u7ed3\u6784\uff0c\u5373\u5185\u90e8\u62e5\u6709\u4e00\u4e2aEntry\u6570\u7ec4\uff0c\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u53c8\u662f\u4e00\u4e2a\u94fe\u8868\uff1b\u540c\u65f6\u53c8\u662f\u4e00\u4e2aReentrantLock\uff08Segment\u7ee7\u627f\u4e86ReentrantLock)\u3002<br \/>\n\u5f53\u9700\u8981put\u5143\u7d20\u7684\u65f6\u5019\uff0c\u5e76\u4e0d\u662f\u5bf9\u6574\u4e2ahashmap\u8fdb\u884c\u52a0\u9501\uff0c\u800c\u662f\u5148\u901a\u8fc7hashcode\u6765\u77e5\u9053\u4ed6\u8981\u653e\u5728\u90a3\u4e00\u4e2a\u5206\u6bb5\u4e2d\uff0c\u7136\u540e\u5bf9\u8fd9\u4e2a\u5206\u6bb5\u8fdb\u884c\u52a0\u9501\uff0c\u6240\u4ee5\u5f53\u591a\u7ebf\u7a0bput\u7684\u65f6\u5019\uff0c\u53ea\u8981\u4e0d\u662f\u653e\u5728\u4e00\u4e2a\u5206\u6bb5\u4e2d\uff0c\u5c31\u5b9e\u73b0\u4e86\u771f\u6b63\u7684\u5e76\u884c\u7684\u63d2\u5165\u3002<br \/>\n\u4f46\u662f\uff0c\u5728\u7edf\u8ba1size\u7684\u65f6\u5019\uff0c\u53ef\u5c31\u662f\u83b7\u53d6hashmap\u5168\u5c40\u4fe1\u606f\u7684\u65f6\u5019\uff0c\u5c31\u9700\u8981\u83b7\u53d6\u6240\u6709\u7684\u5206\u6bb5\u9501\u624d\u80fd\u7edf\u8ba1\u3002<br \/>\n\u5206\u6bb5\u9501\u7684\u8bbe\u8ba1\u76ee\u7684\u662f\u7ec6\u5316\u9501\u7684\u7c92\u5ea6\uff0c\u5f53\u64cd\u4f5c\u4e0d\u9700\u8981\u66f4\u65b0\u6574\u4e2a\u6570\u7ec4\u7684\u65f6\u5019\uff0c\u5c31\u4ec5\u4ec5\u9488\u5bf9\u6570\u7ec4\u4e2d\u7684\u4e00\u9879\u8fdb\u884c\u52a0\u9501\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"\u504f\u5411\u9501\u8f7b\u91cf\u7ea7\u9501\u91cd\u91cf\u7ea7\u9501\">\u504f\u5411\u9501\/\u8f7b\u91cf\u7ea7\u9501\/\u91cd\u91cf\u7ea7\u9501<\/h2>\n<p>\u8fd9\u4e09\u79cd\u9501\u662f\u6307\u9501\u7684\u72b6\u6001\uff0c\u5e76\u4e14\u662f\u9488\u5bf9<code>Synchronized<\/code>\u3002\u5728Java 5\u901a\u8fc7\u5f15\u5165\u9501\u5347\u7ea7\u7684\u673a\u5236\u6765\u5b9e\u73b0\u9ad8\u6548<code>Synchronized<\/code>\u3002\u8fd9\u4e09\u79cd\u9501\u7684\u72b6\u6001\u662f\u901a\u8fc7\u5bf9\u8c61\u76d1\u89c6\u5668\u5728\u5bf9\u8c61\u5934\u4e2d\u7684\u5b57\u6bb5\u6765\u8868\u660e\u7684\u3002<br 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&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"series":[],"class_list":["post-457","post","type-post","status-publish","format-standard","hentry","category-programmers"],"_links":{"self":[{"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/posts\/457"}],"collection":[{"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fick707.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=457"}],"version-history":[{"count":1,"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/posts\/457\/revisions"}],"predecessor-version":[{"id":458,"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/posts\/457\/revisions\/458"}],"wp:attachment":[{"href":"https:\/\/fick707.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=457"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fick707.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=457"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fick707.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=457"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/fick707.com\/index.php?rest_route=%2Fwp%2Fv2%2Fseries&post=457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}