{"id":1110,"date":"2018-12-19T15:05:47","date_gmt":"2018-12-19T07:05:47","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=1110"},"modified":"2018-12-19T15:05:47","modified_gmt":"2018-12-19T07:05:47","slug":"jvm%e5%86%85%e5%ad%98%e6%a8%a1%e5%9e%8b%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=1110","title":{"rendered":"JVM\u5185\u5b58\u6a21\u578b\u8be6\u89e3"},"content":{"rendered":"

JVM\u56de\u987e<\/span><\/p>\n

JVM = \u7c7b\u52a0\u8f7d\u5668(classloader) + \u6267\u884c\u5f15\u64ce(execution engine) + \u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df(runtime data area)<\/span><\/p>\n

<\/div>\n

\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df\u3000<\/span><\/p>\n

Java\u865a\u62df\u673a\u5728\u6267\u884cJava\u7a0b\u5e8f\u7684\u8fc7\u7a0b\u4e2d\u4f1a\u628a\u5b83\u6240\u7ba1\u7406\u7684\u5185\u5b58\u5212\u5206\u4e3a\u82e5\u5e72\u4e2a\u4e0d\u540c\u7684\u6570\u636e\u533a\u57df\u3002\u8fd9\u4e9b\u533a\u57df\u90fd\u6709\u5404\u81ea\u7684\u7528\u9014\uff0c\u4ee5\u53ca\u521b\u5efa\u548c\u9500\u6bc1\u7684\u65f6\u95f4\uff0c\u6709\u7684\u533a\u57df\u968f\u7740\u865a\u62df\u673a\u8fdb\u7a0b\u7684\u542f\u52a8\u800c\u5b58\u5728\uff0c\u6709\u4e9b\u533a\u57df\u5219\u662f\u4f9d\u8d56\u7528\u6237\u7ebf\u7a0b\u7684\u542f\u52a8\u548c\u7ed3\u675f\u800c\u5efa\u7acb\u548c\u9500\u6bc1\u3002<\/span><\/p>\n

<\/div>\n

\u7a0b\u5e8f\u8ba1\u6570\u5668\uff08Program Counter Register\uff09<\/span><\/p>\n

\u7ebf\u7a0b\u79c1\u6709\uff0c\u5b83\u7684\u751f\u547d\u5468\u671f\u4e0e\u7ebf\u7a0b\u76f8\u540c\u3002<\/span><\/span><\/span>\u53ef\u4ee5\u770b\u505a\u662f\u5f53\u524d\u7ebf\u7a0b\u6240\u6267\u884c\u7684\u5b57\u8282\u7801\u7684\u884c\u53f7\u6307\u793a\u5668\u3002<\/span><\/span>\u5728\u865a\u62df\u673a\u7684\u6982\u5ff5\u6a21\u578b\u91cc\uff08\u4ec5\u662f\u6982\u5ff5\u6a21\u578b\uff0c\u5404\u79cd\u865a\u62df\u673a\u53ef\u80fd\u4f1a\u901a\u8fc7\u4e00\u4e9b\u66f4\u9ad8\u6548\u7684\u65b9\u5f0f\u53bb\u5b9e\u73b0\uff09\uff0c\u5b57\u8282\u7801\u89e3\u91ca\u5668\u5de5\u4f5c\u65f6\u5c31\u662f\u901a\u8fc7\u6539\u53d8\u8fd9\u4e2a\u8ba1\u6570\u5668\u7684\u503c\u6765\u9009\u53d6\u4e0b\u4e00\u6761\u9700\u8981\u6267\u884c\u7684\u5b57\u8282\u7801\u6307\u4ee4\uff0c\u5982\uff1a\u5206\u652f\u3001\u5faa\u73af\u3001\u8df3\u8f6c\u3001\u5f02\u5e38\u5904\u7406\u3001\u7ebf\u7a0b\u6062\u590d\uff08\u591a\u7ebf\u7a0b\u5207\u6362<\/span>\uff09\u7b49\u57fa\u7840\u529f\u80fd\u3002<\/span><\/span>\u5982\u679c\u7ebf\u7a0b\u6b63\u5728\u6267\u884c\u7684\u662f\u4e00\u4e2aJava\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u8ba1\u6570\u5668\u8bb0\u5f55\u7684\u662f\u6b63\u5728\u6267\u884c\u7684\u865a\u62df\u673a\u5b57\u8282\u7801\u6307\u4ee4\u7684\u5730\u5740\uff1b\u5982\u679c\u6b63\u5728\u6267\u884c\u7684\u662fNatvie\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u8ba1\u6570\u5668\u503c\u5219\u4e3a\u7a7a\uff08undefined\uff09\u3002<\/span><\/span>\u7a0b\u5e8f\u8ba1\u6570\u5668\u4e2d\u5b58\u50a8\u7684\u6570\u636e\u6240\u5360\u7a7a\u95f4\u7684\u5927\u5c0f\u4e0d\u4f1a\u968f\u7a0b\u5e8f\u7684\u6267\u884c\u800c\u53d1\u751f\u6539\u53d8\uff0c\u6240\u4ee5\u6b64\u533a\u57df\u4e0d\u4f1a\u51fa\u73b0OutOfMemoryError\u7684\u60c5\u51b5\u3002<\/span><\/span><\/span><\/p>\n

Java\u865a\u62df\u673a\u6808\uff08JVM Stacks\uff09<\/span><\/p>\n

\u7ebf\u7a0b\u79c1\u6709\u7684\uff0c\u5b83\u7684\u751f\u547d\u5468\u671f\u4e0e\u7ebf\u7a0b\u76f8\u540c\u3002<\/span><\/span><\/span>\u865a\u62df\u673a\u6808\u63cf\u8ff0\u7684\u662fJava\u65b9\u6cd5\u6267\u884c\u7684\u5185\u5b58\u6a21\u578b<\/span>\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<\/span><\/span><\/span>\u5c40\u90e8\u53d8\u91cf\u8868<\/span>\u5b58\u653e\u4e86\u7f16\u8bd1\u671f\u53ef\u77e5\u7684\u5404\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff08boolean\u3001byte\u3001char\u3001short\u3001int\u3001float\u3001long\u3001double\uff09\u3001\u5bf9\u8c61\u5f15\u7528\uff08reference\u7c7b\u578b\uff09\uff0c\u5b83\u4e0d\u7b49\u540c\u4e8e\u5bf9\u8c61\u672c\u8eab\uff0c\u6839\u636e\u4e0d\u540c\u7684\u865a\u62df\u673a\u5b9e\u73b0\uff0c\u5b83\u53ef\u80fd\u662f\u4e00\u4e2a\u6307\u5411\u5bf9\u8c61\u8d77\u59cb\u5730\u5740\u7684\u5f15\u7528\u6307\u9488\uff0c\u4e5f\u53ef\u80fd\u6307\u5411\u4e00\u4e2a\u4ee3\u8868\u5bf9\u8c61\u7684\u53e5\u67c4\u6216\u8005\u5176\u4ed6\u4e0e\u6b64\u5bf9\u8c61\u76f8\u5173\u7684\u4f4d\u7f6e\uff09\u548creturnAddress\u7c7b\u578b\uff08\u6307\u5411\u4e86\u4e00\u6761\u5b57\u8282\u7801\u6307\u4ee4\u7684\u5730\u5740\uff09\u3002\u5c40\u90e8\u53d8\u91cf\u8868\u6240\u9700\u7684\u5185\u5b58\u7a7a\u95f4\u5728\u7f16\u8bd1\u671f\u95f4\u5b8c\u6210\u5206\u914d\uff0c\u5f53\u8fdb\u5165\u4e00\u4e2a\u65b9\u6cd5\u65f6\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u9700\u8981\u5728\u5e27\u4e2d\u5206\u914d\u591a\u5927\u7684\u5c40\u90e8\u53d8\u91cf\u7a7a\u95f4\u662f\u5b8c\u5168\u786e\u5b9a\u7684\uff0c\u5728\u65b9\u6cd5\u8fd0\u884c\u671f\u95f4\u4e0d\u4f1a\u6539\u53d8\u5c40\u90e8\u53d8\u91cf\u8868\u7684\u5927\u5c0f\u3002<\/span><\/span><\/span>\u8be5\u533a\u57df\u53ef\u80fd\u629b\u51fa\u4ee5\u4e0b\u5f02\u5e38\uff1a<\/span><\/span><\/span><\/p>\n

\u5f53\u7ebf\u7a0b\u8bf7\u6c42\u7684\u6808\u6df1\u5ea6\u8d85\u8fc7\u6700\u5927\u503c\uff0c\u4f1a\u629b\u51fa StackOverflowError \u5f02\u5e38\uff1b<\/span><\/span>\u6808\u8fdb\u884c\u52a8\u6001\u6269\u5c55\u65f6\u5982\u679c\u65e0\u6cd5\u7533\u8bf7\u5230\u8db3\u591f\u5185\u5b58\uff0c\u4f1a\u629b\u51fa OutOfMemoryError \u5f02\u5e38\u3002<\/span><\/span><\/span><\/p>\n

\u672c\u5730\u65b9\u6cd5\u6808\uff08Native Method Stacks\uff09<\/span><\/p>\n

\u4e0e\u865a\u62df\u673a\u6808\u975e\u5e38\u76f8\u4f3c\uff0c\u5176\u533a\u522b\u4e0d\u8fc7\u662f\u865a\u62df\u673a\u6808\u4e3a\u865a\u62df\u673a\u6267\u884cJava\u65b9\u6cd5\uff08\u4e5f\u5c31\u662f\u5b57\u8282\u7801\uff09\u670d\u52a1\uff0c\u800c\u672c\u5730\u65b9\u6cd5\u6808\u5219\u662f\u4e3a\u865a\u62df\u673a\u4f7f\u7528\u5230\u7684Native \u65b9\u6cd5\u670d\u52a1<\/span>\u3002\u865a\u62df\u673a\u89c4\u8303\u4e2d\u5bf9\u672c\u5730\u65b9\u6cd5\u6808\u4e2d\u7684\u65b9\u6cd5\u4f7f\u7528\u7684\u8bed\u8a00\u3001\u4f7f\u7528\u65b9\u5f0f\u4e0e\u6570\u636e\u7ed3\u6784\u5e76\u6ca1\u6709\u5f3a\u5236\u89c4\u5b9a\uff0c\u56e0\u6b64\u5177\u4f53\u7684\u865a\u62df\u673a\u53ef\u4ee5\u81ea\u7531\u5b9e\u73b0\u5b83\u3002\u751a\u81f3\u6709\u7684\u865a\u62df\u673a\uff08\u8b6c\u5982Sun HotSpot \u865a\u62df\u673a\uff09\u76f4\u63a5\u5c31\u628a\u672c\u5730\u65b9\u6cd5\u6808\u548c\u865a\u62df\u673a\u6808\u5408\u4e8c\u4e3a\u4e00\u3002<\/span><\/span>\u4e0e\u865a\u62df\u673a\u6808\u4e00\u6837\uff0c\u672c\u5730\u65b9\u6cd5\u6808\u533a\u57df\u4e5f\u4f1a\u629b\u51faStackOverflowError\u548cOutOfMemoryError\u5f02\u5e38\u3002<\/span><\/span><\/span><\/p>\n

Java\u5806\uff08Heap\uff09<\/span><\/p>\n

\u88ab\u6240\u6709\u7ebf\u7a0b\u5171\u4eab<\/span>\uff0c\u5728\u865a\u62df\u673a\u542f\u52a8\u65f6\u521b\u5efa\uff0c\u7528\u6765\u5b58\u653e\u5bf9\u8c61\u5b9e\u4f8b\uff0c\u51e0\u4e4e\u6240\u6709\u7684\u5bf9\u8c61\u5b9e\u4f8b\u90fd\u5728\u8fd9\u91cc\u5206\u914d\u5185\u5b58<\/span>\u3002<\/span><\/span>\u5bf9\u4e8e\u5927\u591a\u6570\u5e94\u7528\u6765\u8bf4\uff0cJava\u5806\uff08Java Heap\uff09\u662fJava\u865a\u62df\u673a\u6240\u7ba1\u7406\u7684\u5185\u5b58\u4e2d\u6700\u5927<\/span>\u7684\u4e00\u5757\u3002<\/span><\/span>Java\u5806\u662f\u5783\u573e\u6536\u96c6\u5668\u7ba1\u7406\u7684\u4e3b\u8981\u533a\u57df\uff0c\u56e0\u6b64\u5f88\u591a\u65f6\u5019\u4e5f\u88ab\u79f0\u505a\u201cGC\u5806<\/span>\u201d\u3002\u5982\u679c\u4ece\u5185\u5b58\u56de\u6536\u7684\u89d2\u5ea6\u770b\uff0c\u7531\u4e8e\u73b0\u5728\u6536\u96c6\u5668\u57fa\u672c\u90fd\u662f\u91c7\u7528\u7684\u5206\u4ee3\u6536\u96c6\u7b97\u6cd5\uff0c\u6240\u4ee5Java\u5806\u4e2d\u8fd8\u53ef\u4ee5\u7ec6\u5206\u4e3a\uff1a\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\uff1b\u65b0\u751f\u4ee3\u53c8\u6709Eden\u7a7a\u95f4\u3001From Survivor\u7a7a\u95f4\u3001To Survivor\u7a7a\u95f4\u4e09\u90e8\u5206<\/span>\u3002<\/span><\/span>Java \u5806\u4e0d\u9700\u8981\u8fde\u7eed\u5185\u5b58\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u52a8\u6001\u589e\u52a0\u5176\u5185\u5b58\uff0c\u589e\u52a0\u5931\u8d25\u4f1a\u629b\u51fa OutOfMemoryError \u5f02\u5e38\u3002<\/span><\/span><\/span><\/p>\n

<\/div>\n

\u65b9\u6cd5\u533a\uff08Method Area\uff09<\/span><\/span>\u7528\u4e8e\u5b58\u653e\u5df2\u88ab\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<\/span><\/span>\u548c Java \u5806\u4e00\u6837\u4e0d\u9700\u8981\u8fde\u7eed\u7684\u5185\u5b58\uff0c\u5e76\u4e14\u53ef\u4ee5\u52a8\u6001\u6269\u5c55\uff0c\u52a8\u6001\u6269\u5c55\u5931\u8d25\u4e00\u6837\u4f1a\u629b\u51fa OutOfMemoryError \u5f02\u5e38\u3002<\/span><\/span>\u5bf9\u8fd9\u5757\u533a\u57df\u8fdb\u884c\u5783\u573e\u56de\u6536\u7684\u4e3b\u8981\u76ee\u6807\u662f\u5bf9\u5e38\u91cf\u6c60\u7684\u56de\u6536\u548c\u5bf9\u7c7b\u7684\u5378\u8f7d<\/span>\uff0c\u4f46\u662f\u4e00\u822c\u6bd4\u8f83\u96be\u5b9e\u73b0\uff0cHotSpot \u865a\u62df\u673a\u628a\u5b83\u5f53\u6210\u6c38\u4e45\u4ee3\uff08Permanent Generation\uff09\u6765\u8fdb\u884c\u5783\u573e\u56de\u6536\u3002<\/span><\/span>\u65b9\u6cd5\u533a\u903b\u8f91\u4e0a\u5c5e\u4e8e\u5806\u7684\u4e00\u90e8\u5206\uff0c\u4f46\u662f\u4e3a\u4e86\u4e0e\u5806\u8fdb\u884c\u533a\u5206\uff0c\u901a\u5e38\u53c8\u53eb\u201c\u975e\u5806\u201d\u3002<\/span><\/span>\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\uff08Runtime Constant Pool\uff09<\/span>\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u662f\u65b9\u6cd5\u533a\u7684\u4e00\u90e8\u5206\u3002<\/span><\/span>Class \u6587\u4ef6\u4e2d\u7684\u5e38\u91cf\u6c60\uff08\u7f16\u8bd1\u5668\u751f\u6210\u7684\u5404\u79cd\u5b57\u9762\u91cf\u548c\u7b26\u53f7\u5f15\u7528\uff09\u4f1a\u5728\u7c7b\u52a0\u8f7d\u540e\u88ab\u653e\u5165\u8fd9\u4e2a\u533a\u57df\u3002<\/span><\/span>\u9664\u4e86\u5728\u7f16\u8bd1\u671f\u751f\u6210\u7684\u5e38\u91cf\uff0c\u8fd8\u5141\u8bb8\u52a8\u6001\u751f\u6210\uff0c\u4f8b\u5982 String \u7c7b\u7684 intern()\u3002\u8fd9\u90e8\u5206\u5e38\u91cf\u4e5f\u4f1a\u88ab\u653e\u5165\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u3002<\/span><\/span><\/span><\/p>\n

<\/div>\n

\u6ce8\uff1a<\/span>\u5728 JDK1.7\u4e4b\u524d\uff0cHotSpot \u4f7f\u7528\u6c38\u4e45\u4ee3\u5b9e\u73b0\u65b9\u6cd5\u533a\uff1bHotSpot \u4f7f\u7528 GC \u5206\u4ee3\u5b9e\u73b0\u65b9\u6cd5\u533a\u5e26\u6765\u4e86\u5f88\u5927\u4fbf\u5229\uff1b<\/span><\/span>\u4ece JDK1.7 \u5f00\u59cbHotSpot \u5f00\u59cb\u79fb\u9664\u6c38\u4e45\u4ee3\u3002\u5176\u4e2d\u7b26\u53f7\u5f15\u7528\uff08Symbols\uff09\u88ab\u79fb\u52a8\u5230 Native Heap\u4e2d\uff0c\u5b57\u7b26\u4e32\u5e38\u91cf\u548c\u7c7b\u5f15\u7528\u88ab\u79fb\u52a8\u5230 Java Heap\u4e2d\u3002<\/span><\/span>\u5728 JDK1.8 \u4e2d\uff0c\u6c38\u4e45\u4ee3\u5df2\u5b8c\u5168\u88ab\u5143\u7a7a\u95f4(Meatspace)\u6240\u53d6\u4ee3\u3002\u5143\u7a7a\u95f4\u7684\u672c\u8d28\u548c\u6c38\u4e45\u4ee3\u7c7b\u4f3c\uff0c\u90fd\u662f\u5bf9JVM\u89c4\u8303\u4e2d\u65b9\u6cd5\u533a\u7684\u5b9e\u73b0\u3002\u4e0d\u8fc7\u5143\u7a7a\u95f4\u4e0e\u6c38\u4e45\u4ee3\u4e4b\u95f4\u6700\u5927\u7684\u533a\u522b\u5728\u4e8e\uff1a\u5143\u7a7a\u95f4\u5e76\u4e0d\u5728\u865a\u62df\u673a\u4e2d\uff0c\u800c\u662f\u4f7f\u7528\u672c\u5730\u5185\u5b58\u3002\u56e0\u6b64\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5143\u7a7a\u95f4\u7684\u5927\u5c0f\u4ec5\u53d7\u672c\u5730\u5185\u5b58\u9650\u5236\u3002<\/span><\/span><\/span>\u76f4\u63a5\u5185\u5b58\uff08Direct Memory\uff09<\/span><\/span>\u76f4\u63a5\u5185\u5b58\uff08Direct Memory\uff09\u5e76\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\uff0c\u4f46\u662f\u8fd9\u90e8\u5206\u5185\u5b58\u4e5f\u88ab\u9891\u7e41\u5730\u4f7f\u7528\uff0c\u800c\u4e14\u4e5f\u53ef\u80fd\u5bfc\u81f4OutOfMemoryError \u5f02\u5e38\u51fa\u73b0\u3002<\/span><\/span>\u5728 JDK 1.4 \u4e2d\u65b0\u52a0\u5165\u4e86 NIO \u7c7b\uff0c\u5f15\u5165\u4e86\u4e00\u79cd\u57fa\u4e8e\u901a\u9053\uff08Channel\uff09\u4e0e\u7f13\u51b2\u533a\uff08Buffer\uff09\u7684 I\/O\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u4f7f\u7528 Native \u51fd\u6570\u5e93\u76f4\u63a5\u5206\u914d\u5806\u5916\u5185\u5b58\uff0c\u7136\u540e\u901a\u8fc7\u4e00\u4e2a\u5b58\u50a8\u5728 Java \u5806\u91cc\u7684 DirectByteBuffer \u5bf9\u8c61\u4f5c\u4e3a\u8fd9\u5757\u5185\u5b58\u7684\u5f15\u7528\u8fdb\u884c\u64cd\u4f5c\u3002\u8fd9\u6837\u80fd\u5728\u4e00\u4e9b\u573a\u666f\u4e2d\u663e\u8457\u63d0\u9ad8\u6027\u80fd\uff0c\u56e0\u4e3a\u907f\u514d\u4e86\u5728Java \u5806\u548c Native \u5806\u4e2d\u6765\u56de\u590d\u5236\u6570\u636e\u3002<\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

JVM\u56de\u987e JVM = \u7c7b\u52a0\u8f7d\u5668(classloader) + \u6267\u884c\u5f15\u64ce(execution engine) + \u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df(runtime data area) \u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df\u3000 Java\u865a\u62df\u673a\u5728\u6267\u884cJava\u7a0b\u5e8f\u7684\u8fc7\u7a0b\u4e2d\u4f1a\u628a\u5b83\u6240\u7ba1\u7406\u7684\u5185\u5b58\u5212\u5206\u4e3a\u82e5\u5e72\u4e2a\u4e0d\u540c\u7684\u6570\u636e\u533a\u57df\u3002\u8fd9\u4e9b\u533a\u57df\u90fd\u6709\u5404\u81ea\u7684\u7528\u9014\uff0c\u4ee5\u53ca\u521b\u5efa\u548c\u9500\u6bc1\u7684\u65f6\u95f4\uff0c\u6709\u7684\u533a\u57df\u968f\u7740\u865a\u62df\u673a\u8fdb\u7a0b\u7684\u542f\u52a8\u800c\u5b58\u5728\uff0c\u6709\u4e9b\u533a\u57df\u5219\u662f\u4f9d\u8d56\u7528\u6237\u7ebf\u7a0b\u7684\u542f\u52a8\u548c\u7ed3\u675f\u800c\u5efa\u7acb\u548c\u9500\u6bc1\u3002 \u7a0b\u5e8f\u8ba1\u6570\u5668\uff08Program Counter Register\uff09 \u7ebf\u7a0b\u79c1\u6709\uff0c\u5b83\u7684\u751f\u547d\u5468\u671f\u4e0e\u7ebf\u7a0b\u76f8\u540c\u3002\u53ef\u4ee5\u770b\u505a\u662f\u5f53\u524d\u7ebf\u7a0b\u6240\u6267\u884c\u7684\u5b57\u8282\u7801\u7684\u884c\u53f7\u6307\u793a\u5668\u3002\u5728\u865a\u62df\u673a\u7684\u6982\u5ff5\u6a21\u578b\u91cc\uff08\u4ec5\u662f\u6982\u5ff5\u6a21\u578b\uff0c\u5404\u79cd\u865a\u62df\u673a\u53ef\u80fd\u4f1a\u901a\u8fc7\u4e00\u4e9b\u66f4\u9ad8\u6548\u7684\u65b9\u5f0f\u53bb\u5b9e\u73b0\uff09\uff0c\u5b57\u8282\u7801\u89e3\u91ca\u5668\u5de5\u4f5c\u65f6\u5c31\u662f\u901a\u8fc7\u6539\u53d8\u8fd9\u4e2a\u8ba1\u6570\u5668\u7684\u503c\u6765\u9009\u53d6\u4e0b\u4e00\u6761\u9700\u8981\u6267\u884c\u7684\u5b57\u8282\u7801\u6307\u4ee4\uff0c\u5982\uff1a\u5206\u652f\u3001\u5faa\u73af\u3001\u8df3\u8f6c\u3001\u5f02\u5e38\u5904\u7406\u3001\u7ebf\u7a0b\u6062\u590d\uff08\u591a\u7ebf\u7a0b\u5207\u6362\uff09\u7b49\u57fa\u7840\u529f\u80fd\u3002\u5982\u679c\u7ebf\u7a0b\u6b63\u5728\u6267\u884c\u7684\u662f\u4e00\u4e2aJava\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u8ba1\u6570\u5668\u8bb0\u5f55\u7684\u662f\u6b63\u5728\u6267\u884c\u7684\u865a\u62df\u673a\u5b57\u8282\u7801\u6307\u4ee4\u7684\u5730\u5740\uff1b\u5982\u679c\u6b63\u5728\u6267\u884c\u7684\u662fNatvie\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u8ba1\u6570\u5668\u503c\u5219\u4e3a\u7a7a\uff08undefined\uff09\u3002\u7a0b\u5e8f\u8ba1\u6570\u5668\u4e2d\u5b58\u50a8\u7684\u6570\u636e\u6240\u5360\u7a7a\u95f4\u7684\u5927\u5c0f\u4e0d\u4f1a\u968f\u7a0b\u5e8f\u7684\u6267\u884c\u800c\u53d1\u751f\u6539\u53d8\uff0c\u6240\u4ee5\u6b64\u533a\u57df\u4e0d\u4f1a\u51fa\u73b0OutOfMemoryError\u7684\u60c5\u51b5\u3002 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