{"id":10609,"date":"2023-11-28T21:39:55","date_gmt":"2023-11-28T13:39:55","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=10609"},"modified":"2023-12-07T14:32:27","modified_gmt":"2023-12-07T06:32:27","slug":"jvm-zhong-nei-cun-mo-xing-shi-shen-me-jmm-shi-shen","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/jvm-zhong-nei-cun-mo-xing-shi-shen-me-jmm-shi-shen\/","title":{"rendered":"JVM\u4e2d\u5185\u5b58\u6a21\u578b\u662f\u4ec0\u4e48\uff1f JMM\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"<p>Java \u5185\u5b58\u6a21\u578b\uff08Java Memory Model\uff0cJMM\uff09\u662f\u4e00\u79cd\u89c4\u8303\uff0c\u5b9a\u4e49\u4e86\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u4e2d\u5171\u4eab\u6570\u636e\u7684\u8bbf\u95ee\u89c4\u5219\u548c\u540c\u6b65\u673a\u5236\u3002JMM \u63d0\u4f9b\u4e86\u4e00\u79cd\u62bd\u8c61\u7684\u3001\u6807\u51c6\u5316\u7684\u65b9\u5f0f\u6765\u63cf\u8ff0 Java \u7a0b\u5e8f\u5728\u4e0d\u540c\u7ebf\u7a0b\u4e4b\u95f4\u5982\u4f55\u4ea4\u4e92\u4ee5\u53ca\u5982\u4f55\u5bf9\u5171\u4eab\u6570\u636e\u8fdb\u884c\u8bbf\u95ee\u548c\u4fee\u6539\u3002<\/p>\n<p>JMM \u7684\u5173\u952e\u6982\u5ff5\u5305\u62ec\uff1a<\/p>\n<ol>\n<li>\n<strong>\u4e3b\u5185\u5b58\uff08Main Memory\uff09\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e3b\u5185\u5b58\u662f\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u7684\u5185\u5b58\u533a\u57df\uff0c\u7528\u4e8e\u5b58\u50a8 Java \u5bf9\u8c61\u5b9e\u4f8b\u3001\u9759\u6001\u53d8\u91cf\u3001\u548c\u5171\u4eab\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>\u5de5\u4f5c\u5185\u5b58\uff08Working Memory\uff09\uff1a<\/strong><\/p>\n<ul>\n<li>\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u81ea\u5df1\u7684\u5de5\u4f5c\u5185\u5b58\uff0c\u7528\u4e8e\u5b58\u50a8\u4e3b\u5185\u5b58\u4e2d\u7684\u90e8\u5206\u6570\u636e\u7684\u526f\u672c\u3002\u7ebf\u7a0b\u5bf9\u53d8\u91cf\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u5728\u5de5\u4f5c\u5185\u5b58\u4e2d\u8fdb\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>\u539f\u5b50\u6027\uff08Atomicity\uff09\uff1a<\/strong><\/p>\n<ul>\n<li>JMM \u4fdd\u8bc1\u4e86\u5bf9\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff08\u4f8b\u5982 <code>int<\/code> \u548c <code>long<\/code>\uff09\u7684\u8bfb\u53d6\u548c\u5199\u5165\u5177\u6709\u539f\u5b50\u6027\u3002\u5373\uff0c\u5bf9\u8fd9\u4e9b\u53d8\u91cf\u7684\u64cd\u4f5c\u4e0d\u4f1a\u88ab\u4e2d\u65ad\uff0c\u8981\u4e48\u5168\u90e8\u6267\u884c\uff0c\u8981\u4e48\u90fd\u4e0d\u6267\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>\u53ef\u89c1\u6027\uff08Visibility\uff09\uff1a<\/strong><\/p>\n<ul>\n<li>JMM \u901a\u8fc7\u4e00\u4e9b\u673a\u5236\u6765\u4fdd\u8bc1\u5bf9\u53d8\u91cf\u7684\u4fee\u6539\u5728\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u662f\u53ef\u89c1\u7684\uff0c\u4ee5\u53ca\u5728\u5176\u4ed6\u7ebf\u7a0b\u4e2d\u53ef\u4ee5\u7acb\u5373\u611f\u77e5\u5230\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 <code>synchronized<\/code> \u5173\u952e\u5b57\u548c <code>volatile<\/code> \u5173\u952e\u5b57\u53ef\u4ee5\u5b9e\u73b0\u53ef\u89c1\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>\u6709\u5e8f\u6027\uff08Ordering\uff09\uff1a<\/strong><\/p>\n<ul>\n<li>JMM \u786e\u4fdd\u7a0b\u5e8f\u6267\u884c\u7684\u987a\u5e8f\u9075\u5faa\u4e00\u5b9a\u7684\u89c4\u5219\uff0c\u4e0d\u4f1a\u968f\u610f\u91cd\u6392\u5e8f\u3002\u8fd9\u901a\u8fc7\u7a0b\u5e8f\u7684\u540c\u6b65\u64cd\u4f5c\uff08\u4f8b\u5982\u9501\u548c volatile \u5199\u64cd\u4f5c\uff09\u6765\u5b9e\u73b0\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>JMM \u7684\u8bbe\u8ba1\u65e8\u5728\u786e\u4fdd\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u5728\u4e0d\u540c\u7684\u786c\u4ef6\u548c\u64cd\u4f5c\u7cfb\u7edf\u4e0a\u90fd\u80fd\u4fdd\u6301\u4e00\u81f4\u7684\u884c\u4e3a\u3002\u5f00\u53d1\u8005\u53ef\u4ee5\u4f9d\u8d56 JMM \u6765\u7406\u89e3\u548c\u9884\u6d4b\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u7684\u6267\u884c\u7ed3\u679c\uff0c\u800c\u4e0d\u9700\u8981\u8fc7\u4e8e\u62c5\u5fc3\u5e95\u5c42\u786c\u4ef6\u7684\u7ec6\u8282\u3002<\/p>\n<p>\u5728\u7f16\u5199\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u65f6\uff0c\u7406\u89e3 JMM \u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u5b83\u5e2e\u52a9\u5f00\u53d1\u8005\u6b63\u786e\u5730\u4f7f\u7528\u540c\u6b65\u673a\u5236\uff0c\u907f\u514d\u6570\u636e\u7ade\u4e89\u3001\u6b7b\u9501\u7b49\u95ee\u9898\u3002 JMM \u7684\u89c4\u8303\u6027\u8d28\u4fdd\u8bc1\u4e86\u5728\u4e0d\u540c\u7684 Java \u865a\u62df\u673a\u5b9e\u73b0\u4e2d\uff0c\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u7684\u884c\u4e3a\u90fd\u662f\u4e00\u81f4\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u5185\u5b58\u6a21\u578b\uff08Java Memory Model\uff0cJMM\uff09\u662f\u4e00\u79cd\u89c4\u8303\uff0c\u5b9a\u4e49\u4e86\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u4e2d\u5171\u4eab\u6570\u636e\u7684\u8bbf\u95ee\u89c4 [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[119],"tags":[],"class_list":["post-10609","post","type-post","status-publish","format-standard","hentry","category-jvm"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10609","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=10609"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10609\/revisions"}],"predecessor-version":[{"id":16869,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10609\/revisions\/16869"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=10609"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=10609"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=10609"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}