{"id":129,"date":"2019-01-25T12:52:23","date_gmt":"2019-01-25T04:52:23","guid":{"rendered":"http:\/\/www.changxuan.top\/?p=129"},"modified":"2020-10-12T20:22:48","modified_gmt":"2020-10-12T12:22:48","slug":"2-java-%e5%86%85%e5%ad%98%e5%8c%ba%e5%9f%9f%e4%b8%8e%e5%86%85%e5%ad%98%e6%ba%a2%e5%87%ba%e5%bc%82%e5%b8%b8","status":"publish","type":"post","link":"https:\/\/www.changxuan.top\/?p=129","title":{"rendered":"Java \u5185\u5b58\u533a\u57df\u4e0e\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">\u6982\u8ff0<\/h3>\n\n\n\n<p>Java \u5bf9\u4e8e C \u548c C++ \u6765\u8bf4\u5b58\u5728\u4e00\u4e2a\u5f88\u597d\u7684\u7279\u6027\u5c31\u662f\u5728\u865a\u62df\u673a\u7684\u81ea\u52a8\u5185\u5b58\u7ba1\u7406\u673a\u5236\u7684\u5e2e\u52a9\u4e0b\uff0c\u4e0d\u9700\u8981\u4e3a\u6bcf\u4e00\u4e2a new  \u64cd\u4f5c\u53bb\u5199\u914d\u5bf9\u7684 delete\/free \u4ee3\u7801\uff0c\u800c\u4e14**\u4e0d\u5bb9\u6613** \u51fa\u73b0\u5185\u5b58\u6cc4\u6f0f\u548c\u5185\u5b58\u6ea2\u51fa\u95ee\u9898\u3002\u6ce8\u610f\u8fd9\u91cc\u8bf4\u7684\u662f\u4e0d\u5bb9\u6613\uff0c\u6240\u4ee5\u8fd8\u662f\u6709\u53ef\u80fd\u4f1a\u51fa\u73b0\u7684\u3002\u90a3\u4e48\u5f53\u51fa\u73b0\u7684\u65f6\u5019\u5c31\u9700\u8981\u4f60\u80fd\u591f\u6392\u67e5\u548c\u89e3\u51b3\u6389\u9519\u8bef\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df<\/h3>\n\n\n\n<p>Java \u865a\u62df\u673a\u5728\u6267\u884c\u7a0b\u5e8f\u7684\u8fc7\u7a0b\u4e2d\u4f1a\u628a\u6240\u7ba1\u7406\u7684\u5185\u5b58\u5212\u5206\u4e3a\u82e5\u5e72\u4e2a\u4e0d\u540c\u7684\u6570\u636e\u533a\u57df\u3002\u6bcf\u4e2a\u533a\u57df\u7528\u9014\u4e0d\u540c\uff0c\u751f\u547d\u5468\u671f\u4e5f\u4e0d\u540c\uff0c\u6216\u968f\u865a\u62df\u673a\u8fdb\u7a0b\u4ea7\u751f\u548c\u9500\u6bc1\uff0c\u6216\u968f\u7528\u6237\u7ebf\u7a0b\u4ea7\u751f\u548c\u9500\u6bc1\u3002\u5176\u4e2d\u6709\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u7684\u6570\u636e\u533a\u6709\uff1a\u65b9\u6cd5\u533a\uff08Method Area)\u3001\u5806\uff08Heap\uff09\u7ebf\u7a0b\u9694\u79bb\u7684\u6570\u636e\u533a\u6709\uff1a\u865a\u62df\u673a\u6808\uff08VM Stack\uff09\u3001\u672c\u5730\u65b9\u6cd5\u6808\uff08Native Method Stack\uff09\u3001\u7a0b\u5e8f\u8ba1\u6570\u5668\uff08Program Couter Register\uff09<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7a0b\u5e8f\u8ba1\u6570\u5668<\/h3>\n\n\n\n<p>\u5728\u5b66\u64cd\u4f5c\u7cfb\u7edf\u7684\u65f6\u5019\uff0c\u6211\u4eec\u77e5\u9053\u8fdb\u7a0b\u662f\u8d44\u6e90\u5206\u914d\u7684\u57fa\u672c\u5355\u4f4d\uff0c\u8fdb\u7a0b\u662f\u8c03\u5ea6\u7684\u57fa\u672c\u5355\u4f4d\u3002\u7ebf\u7a0b\u57fa\u672c\u4e0a\u4e0d\u62e5\u6709\u7cfb\u7edf\u8d44\u6e90\u53ea\u62e5\u6709\u4e00\u4e9b\u5fc5\u4e0d\u53ef\u5c11\u7684\u8d44\u6e90\u5176\u4e2d\u5c31\u5305\u62ec\u7a0b\u5e8f\u8ba1\u6570\u5668\u3002\u7a0b\u5e8f\u8ba1\u6570\u5668\u7684\u4f5c\u7528\u662f\u5f53\u524d\u7ebf\u7a0b\u6240\u6267\u884c\u7684\u5b57\u8282\u7801\u7684\u884c\u53f7\u6307\u793a\u5668\u3002Java \u865a\u62df\u673a\u7684\u591a\u7ebf\u7a0b\u662f\u901a\u8fc7\u7ebf\u7a0b\u8f6e\u6d41\u5207\u6362\u5e76\u5206\u914d\u5904\u7406\u5668\u7684\u6267\u884c\u65f6\u95f4\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u7684\uff0c\u5728\u4efb\u4f55\u4e00\u4e2a\u786e\u5b9a\u7684\u65f6\u523b\uff0c\u4e00\u4e2a\u5904\u7406\u5668\u53ea\u4f1a\u6267\u884c\u4e00\u6761\u7ebf\u7a0b\u4e2d\u7684\u6307\u4ee4\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Java \u865a\u62df\u673a\u6808<\/h3>\n\n\n\n<p>Java \u865a\u62df\u673a\u6808\u4e5f\u662f\u7ebf\u7a0b\u79c1\u6709\u7684\uff0c\u751f\u547d\u5468\u671f\u4e0e\u7ebf\u7a0b\u76f8\u540c\u3002\u865a\u62df\u673a\u6808\u63cf\u8ff0\u7684\u662f Java \u65b9\u6cd5\u6267\u884c\u7684\u5185\u5b58\u6a21\u578b\uff1a\u6bcf\u4e2a\u65b9\u6cd5\u88ab\u6267\u884c\u7684\u65f6\u5019\u90fd\u4f1a\u540c\u65f6\u521b\u5efa\u4e00\u4e2a\u6808\u5e27\uff08Stack Frame\uff09\u7528\u4e8e\u5b58\u50a8\u5c40\u90e8\u53d8\u91cf\u8868\u3001\u64cd\u4f5c\u6808\u3001\u52a8\u6001\u94fe\u63a5\u3001\u65b9\u6cd5\u51fa\u53e3\u7b49\u4fe1\u606f\u3002\u6bcf\u4e00\u4e2a\u65b9\u6cd5\u88ab\u8c03\u7528\u76f4\u81f3\u6267\u884c\u5b8c\u6210\u7684\u8fc7\u7a0b\uff0c\u5c31\u5bf9\u5e94\u7740\u4e00\u4e2a\u6808\u5e27\u5728\u865a\u62df\u673a\u6808\u4e2d\u4ece\u5165\u6808\u5230\u51fa\u6808\u7684\u8fc7\u7a0b\u3002<\/p>\n\n\n\n<p>\u4e00\u822c\u5728\u9762\u8bd5\u4e2d\u90fd\u4f1a\u95ee\u5230\u5173\u4e8eJava \u5185\u5b58\u5206\u533a\u4e2d\u7684\u5806\u5185\u5b58\uff08Heap\uff09\u4e0e\u6808\u5185\u5b58\uff08Stack\uff09\u95ee\u9898\u3002\u6211\u66fe\u7ecf\u7b80\u5355\u7684\u4ee5\u4e3a\u5c31\u662f\u6570\u636e\u7ed3\u6784\u4e2d\u7684\u6808\u4e00\u6837\u5462\u3002\u5206\u4e3a\u8fd9\u4e24\u79cd\u5206\u533a\u662f\u6bd4\u8f83\u7c97\u7cd9\u7684\u5206\u6cd5\uff0c\u5b9e\u9645\u7684\u60c5\u51b5\u6bd4\u8fd9\u66f4\u52a0\u590d\u6742\u3002\u201c\u6808\u201d\u5c31\u662f\u865a\u62df\u673a\u6808\uff0c\u6216\u6307\u7684\u662f\u865a\u62df\u673a\u6808\u4e2d\u7684\u5c40\u90e8\u53d8\u91cf\u8868\u90e8\u5206\u3002\u5c40\u90e8\u53d8\u91cf\u8868\u6240\u9700\u7684\u5185\u5b58\u7a7a\u95f4\u662f\u5728\u7f16\u8bd1\u671f\u95f4\u5b8c\u6210\u5206\u914d\u7684\uff0c\u5728\u8fd0\u884c\u671f\u95f4\u4e0d\u4f1a\u6539\u53d8\u5927\u5c0f\u3002<\/p>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u533a\u57df\u4f1a\u4ea7\u751f\u4e24\u79cd\u5f02\u5e38\u7684\u60c5\u51b5\uff0c\u4e00\u662f \u5982\u679c\u7ebf\u7a0b\u8bf7\u6c42\u7684\u6808\u7684\u6df1\u5ea6\u5927\u4e8e\u865a\u62df\u673a\u6240\u5141\u8bb8\u7684\u6df1\u5ea6\uff0c\u5c06\u629b\u51fa StackOverflowError \u5f02\u5e38\uff0c\u4e8c\u662f \u5982\u679c\u865a\u62df\u673a\u6808\u53ef\u4ee5\u52a8\u6001\u6269\u5c55\uff0c\u5f53\u6269\u5c55\u65f6\u65e0\u6cd5\u7533\u8bf7\u5230\u8db3\u591f\u7684\u5185\u5b58\u65f6\u4f1a\u629b\u51fa OutOfMemoryError \u5f02\u5e38\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u5730\u65b9\u6cd5\u6808<\/h3>\n\n\n\n<p>Native Method Stacks \u4e0e\u865a\u62df\u673a\u6808\u6240\u53d1\u6325\u7684\u4f5c\u7528\u662f\u975e\u5e38\u76f8\u4f3c\u7684\uff0c\u865a\u62df\u673a\u6808\u4e3a\u865a\u62df\u673a\u6267\u884cJava \u65b9\u6cd5\u670d\u52a1\uff0c\u672c\u5730\u65b9\u6cd5\u6808\u4e3a\u865a\u62df\u673a\u4f7f\u7528\u5230\u7684 Native \u65b9\u6cd5\u670d\u52a1\u3002\u56e0\u4e3a\u865a\u62df\u673a\u6ca1\u6709\u5bf9\u672c\u5730\u65b9\u6cd5\u6808\u4e2d\u7684\u65b9\u6cd5\u662f\u7528\u7684\u8bed\u8a00\u7b49\u5f3a\u5236\u89c4\u5b9a\uff0cSun HotSpot \u5c06\u4e24\u8005\u5408\u4e8c\u4e3a\u4e00\uff0c\u672c\u5730\u65b9\u6cd5\u6808\u533a\u57df\u540c\u6837\u4f1a\u629b\u51fa \u4e0a\u8ff0\u4e24\u79cd\u5f02\u5e38\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Java \u5806<\/h3>\n\n\n\n<p>Java \u5806\uff08Java Heap\uff09\u7684\u51e0\u4e2a\u7279\u70b9<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Java \u865a\u62df\u673a\u6240\u7ba1\u7406\u7684\u5185\u5b58\u4e2d\u7684\u6700\u5927\u4e00\u5757<\/li><li>\u88ab\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u7684\u4e00\u5757\u5185\u5b58\u533a\u57df<\/li><li>\u865a\u62df\u673a\u542f\u52a8\u65f6\u521b\u5efa<\/li><li>\u552f\u4e00\u76ee\u7684\u5b58\u653e\u5bf9\u8c61\u5b9e\u4f8b<\/li><li>\u5783\u573e\u6536\u96c6\u5668\u7ba1\u7406\u7684\u4e3b\u8981\u533a\u57df\uff0c\u4e5f\u88ab\u79f0\u4e3a \u201cGC\u5806\u201d<\/li><li>\u53ef\u5904\u4e8e\u7269\u7406\u4e0a\u4e0d\u8fde\u7eed\u7684\u5185\u5b58\u7a7a\u95f4<\/li><li>\u5904\u4e8e\u903b\u8f91\u4e0a\u8fde\u7eed\u7684\u5185\u5b58\u7a7a\u95f4<\/li><\/ol>\n\n\n\n<p>\u5728Java \u89c4\u8303\u4e2d\u63cf\u8ff0\u7684\u662f\uff1a\u7d20\u6709\u7684\u5bf9\u8c61\u5b9e\u4f8b\u4ee5\u53ca\u6570\u7ec4\u90fd\u8981\u5728\u5806\u4e0a\u5206\u914d\u3002\u4f46\u662f\u76ee\u524d\u6765\u770b\u4e0d\u518d\u662f\u90a3\u4e48\u7edd\u5bf9\u4e86\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u65b9\u6cd5\u533a<\/h3>\n\n\n\n<p>\u4f5c\u7528\uff1a\u5b58\u50a8\u5df2\u88ab\u865a\u62df\u673a\u52a0\u8f7d\u7684\u7c7b\u4fe1\u606f\u3001\u5e38\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001\u5373\u65f6\u7f16\u8bd1\u5668\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u7b49\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u7279\u70b9\uff1a\u903b\u8f91\u4e0a\u662fJava \u5806\u7684\u4e00\u90e8\u5206\uff0c\u4f46\u662f\u522b\u540d\u53eb\u505a Non-Heap\uff08\u975e\u5806\uff09\u3002\u5b83\u4e0d\u9700\u8981\u8fde\u7eed\u7684\u7269\u7406\u5185\u5b58\u548c\u53ef\u4ee5\u9009\u62e9\u56fa\u5b9a\u5927\u5c0f\u6216\u8005\u53ef\u6269\u5c55\uff0c\u5e76\u4e14\u53ef\u4ee5\u9009\u62e9\u4e0d\u5b9e\u73b0\u5783\u573e\u6536\u96c6\u3002<\/p>\n\n\n\n<p>\u5f53\u65b9\u6cd5\u533a\u65e0\u6cd5\u6ee1\u8db3\u5185\u5b58\u5206\u914d\u9700\u6c42\u65f6\uff0c\u5c06\u4f1a\u629b\u51fa OutOfMemoryError \u5f02\u5e38\u3002\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u4e5f\u662f\u65b9\u6cd5\u533a\u7684\u4e00\u90e8\u5206\uff0c\u5f53\u5e38\u91cf\u6c60\u65e0\u6cd5\u7533\u8bf7\u5230\u5185\u5b58\u65f6\u4f1a\u629b\u51fa OutOfMemoryError \u5f02\u5e38\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u76f4\u63a5\u5185\u5b58<\/h3>\n\n\n\n<p>\u5b83\u4e0d\u662f\u865a\u62df\u673a\u8fd0\u884c\u65f6\u6570\u636e\u533a\u7684\u4e00\u90e8\u5206\uff0c\u4e5f\u4e0d\u662fJava \u865a\u62df\u673a\u89c4\u8303\u4e2d\u5b9a\u4e49\u7684\u5185\u5b58\u533a\u57df\u3002\u5f53\u5404\u4e2a\u5185\u5b58\u533a\u57df\u7684\u603b\u548c\u5927\u4e8e\u7269\u7406\u5185\u5b58\u9650\u5236\uff0c\u4ece\u800c\u5bfc\u5e08\u52a8\u6001\u6269\u5c55\u65f6\u51fa\u73b0 OutOfMemoryError \u5f02\u5e38\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5bf9\u8c61\u8bbf\u95ee<\/h3>\n\n\n\n<p>\u901a\u8fc7\u4e00\u53e5\u4ee3\u7801\u6765\u770b\uff1a<br><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Object obj = new Object()<\/code><\/pre>\n\n\n\n<p>Object obj \u8fd9\u90e8\u5206\u8bed\u4e49\u53cd\u6620\u5230 Java \u6808\u7684\u672c\u5730\u53d8\u91cf\u8868\u4e2d\uff0c\u4f5c\u4e3a\u4e00\u4e2a reference \u7c7b\u578b\u6570\u636e\u51fa\u73b0\u3002 new Object()  \u8fd9\u90e8\u5206\u7684\u8bed\u4e49\u5c06\u4f1a\u53cd\u6620\u5230 Java \u5806\u4e2d\uff0c\u5f62\u6210\u4e00\u5757\u5b58\u50a8\u4e86 Object \u7c7b\u578b\u6240\u6709\u5b9e\u4f8b\u6570\u636e\u503c\u7684\u7ed3\u6784\u5316\u5185\u5b58\uff0c\u6b64\u5185\u5b58\u957f\u5ea6\u4e0d\u56fa\u5b9a\u3002\u865a\u62df\u673a\u8bbf\u95ee\u5bf9\u8c61\u7684\u65b9\u5f0f\u4e3b\u8981\u5206\u4e3a\u4e24\u79cd\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u4f7f\u7528\u53e5\u67c4<\/li><li>\u76f4\u63a5\u6307\u9488<\/li><\/ul>\n\n\n\n<p>\u53e5\u67c4\u8bbf\u95ee\u4f18\u52bf\u5728\u4e8e reference \u4e2d\u5b58\u50a8\u7684\u65f6\u7a33\u5b9a\u7684\u53e5\u67c4\u5730\u5740\uff0c\u5728\u5bf9\u8c61\u88ab\u79fb\u52a8\u65f6\u53ea\u4f1a\u6539\u53d8\u53e5\u67c4\u4e2d\u7684\u5b9e\u4f8b\u6570\u636e\u6307\u9488\uff0c\u800c reference \u672c\u8eab\u4e0d\u9700\u8981\u4fee\u6539\u3002<\/p>\n\n\n\n<p>\u76f4\u63a5\u6307\u9488\u8bbf\u95ee\u7684\u4f18\u52bf\u5728\u4e8e \u901f\u5ea6\u66f4\u5feb\uff0c\u5b83\u8282\u7701\u4e86\u4e00\u6b21\u6307\u9488\u5b9a\u4f4d\u7684\u65f6\u95f4\u5f00\u9500\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8ff0 Java 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