{"id":1457,"date":"2021-05-21T18:18:35","date_gmt":"2021-05-21T10:18:35","guid":{"rendered":"https:\/\/www.changxuan.top\/?p=1457"},"modified":"2021-05-22T14:54:13","modified_gmt":"2021-05-22T06:54:13","slug":"%e8%81%8a%e4%b8%80%e8%81%8a-jvm-%e7%9a%84-gc","status":"publish","type":"post","link":"https:\/\/www.changxuan.top\/?p=1457","title":{"rendered":"\u804a\u4e00\u804a JVM \u7684 GC"},"content":{"rendered":"\n

\u5f15\u8a00<\/h2>\n\n\n\n

JVM \u4e2d\u7684 GC \u5728\u6280\u672f\u535a\u5ba2\u4e2d\u5e94\u8be5\u7b97\u662f\u4e2a\u8001\u751f\u5e38\u8c08\u7684\u8bdd\u9898\uff0c\u7f51\u7edc\u4e0a\u4e5f\u5b58\u5728\u7740\u8bb8\u591a\u8d28\u91cf\u53c2\u5dee\u4e0d\u9f50\u7684\u6587\u7ae0\uff0c\u53ef\u4ee5\u770b\u51fa\u6765\u5927\u90fd\u662f\u201c\u590d\u5236\u7c98\u8d34\u201d\u7684\u98ce\u683c\u3002\u5728\u5199\u8fd9\u7bc7\u6587\u7ae0\u7684\u65f6\u5019\uff0c\u6211\u95ee\u4e86\u95ee\u81ea\u5df1\u201c\u73b0\u5728\u6211\u7b97\u4e0d\u7b97\u662f\u5728\u5236\u9020\u6570\u636e\u5783\u573e\uff1f\u201d\u3002<\/p>\n\n\n\n

\u6211\u4e3a\u4ec0\u4e48\u8981\u5199\u5462\uff1f\u5176\u5b9e\u5199\u8fd9\u7bc7\u535a\u6587\u7684\u4e3b\u8981\u76ee\u7684\u4e0d\u662f\u7ed9\u522b\u4eba\u770b\u7684\uff0c\u800c\u662f\u60f3\u8981\u8bb0\u5f55\u4e00\u4e0b\u81ea\u5df1\u5bf9\u4e8e JVM \u4e2d GC \u7684\u7406\u89e3\u4e0e\u8ba4\u8bc6\u3002\u6211\u8ba4\u4e3a\u6709\u4e00\u7c7b\u6587\u7ae0\u5b58\u5728\u7684\u610f\u4e49\u4e3b\u8981\u662f\u7528\u6765\u8bb0\u5f55\u7684\uff0c\u8bb0\u5f55\u81ea\u5df1\u5bf9\u4e00\u4e2a\u4e8b\u7269\u8ba4\u8bc6\u4e0e\u601d\u8003\u7684\u8fc7\u7a0b\u3002\u5982\u679c\u4f60\u80fd\u591f\u5c06\u5bf9\u6b64\u4e8b\u7269\u7684\u7406\u89e3\u8f6c\u6362\u4e3a\u6210\u4f53\u7cfb\u5316\u7684\u6709\u6e05\u6670\u8109\u7edc\u7ed3\u6784\u7684\u6587\u5b57\uff0c\u90a3\u4e48\u5e94\u8be5\u8bf4\u4f60\u786e\u5b9e\u662f\u4e86\u89e3\u5b83\u7684\u3002\u6240\u4ee5\uff0c\u8fd9\u7bc7\u6587\u7ae0\u5c31\u662f\u7528\u6765\u8bb0\u5f55\u7684\uff0c\u5982\u679c\u6211\u7684\u601d\u8003\u8fc7\u7a0b\u6070\u5de7\u4e5f\u6709\u52a9\u4e8e\u4f60\u5bf9\u4e8e GC \u7684\u7406\u89e3\u90a3\u81ea\u7136\u662f\u518d\u597d\u4e0d\u8fc7\u4e86\u3002<\/p>\n\n\n\n

\u6b63\u6587<\/h2>\n\n\n\n

JVM \u548c GC<\/h3>\n\n\n\n

\u9996\u5148\u8981\u7ed9\u6ca1\u6709\u505a\u8db3\u529f\u8bfe\u7684\u540c\u5b66\u4ecb\u7ecd\u4e00\u4e0b JVM \u548c GC \u8fd9\u4e24\u4e2a\u540d\u8bcd\u3002<\/p>\n\n\n\n

JVM \u7684\u5168\u79f0\u662f Java Virtual Machine\uff0c\u4e5f\u5c31\u662f Java \u865a\u62df\u673a\uff0c\u5b83\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u6267\u884c\u5b57\u8282\u7801\u6587\u4ef6\uff08class\uff09\u3002\u4e0d\u8fc7\u8981\u6e05\u695a\u7684\u4e00\u70b9\u662f\uff0c\u867d\u7136\u5b83\u53eb Java \u865a\u62df\u673a\uff0c\u4f46\u5b83\u5e76\u4e0d\u662f\u53ea\u80fd\u8fd0\u884c Java \u8bed\u8a00\u4ee3\u7801\u6240\u7f16\u8bd1\u7684\u5b57\u8282\u7801\u6587\u4ef6\u3002\u5c31\u5982\u524d\u9762\u8bf4\u201c\u4e3b\u8981\u4f5c\u7528\u662f\u6267\u884c\u5b57\u8282\u7801\u6587\u4ef6\u201d\uff0c\u6240\u4ee5\u65e0\u8bba\u662f\u4ec0\u4e48\u8bed\u8a00\u53ea\u8981\u4f60\u7684\u4ee3\u7801\u7f16\u8bd1\u540e\u6240\u751f\u6210\u7684\u6587\u4ef6\u683c\u5f0f\u7b26\u5408 JVM \u7684\u89c4\u8303\uff0c\u90a3\u4e48\u5c31\u80fd\u5728 JVM \u4e0a\u6267\u884c\u3002\u4f8b\u5982\uff0cKotlin\u3001Groovy\u3001Scala\u7b49\u8bed\u8a00\uff0c\u7f16\u8bd1\u540e\u90fd\u53ef\u4ee5\u8fd0\u884c\u5728 Java \u865a\u62df\u673a\u4e2d\u3002\u53e6\u5916\uff0c\u6709\u4e00\u4e2a\u53eb\u505a\u300aJVM \u865a\u62df\u673a\u89c4\u8303\u300b\u7684\u4e1c\u897f\uff0c\u6839\u636e\u8fd9\u4e2a\u89c4\u8303\u8c01\u90fd\u53ef\u4ee5\u5b9e\u73b0\u81ea\u5df1\u7684 Java \u865a\u62df\u673a\u3002\u6240\u4ee5\u5728\u6280\u672f\u53d1\u5c55\u7684\u5386\u53f2\u957f\u6cb3\u4e2d\uff0c\u51fa\u73b0\u8fc7\u4e0d\u6b62\u4e00\u6b3e Java \u865a\u62df\u673a\uff0c\u50cf Classic VM\u3001Exact VM\u3001HotSpot VM\u3002\u5176\u4e2d HotSpot VM \u4e5f\u662f\u6211\u4eec\u6700\u719f\u6089\u3001\u6700\u5e38\u7528\u7684\u4e00\u6b3e \uff0c\u540e\u9762\u6211\u4eec\u63d0\u5230\u7684 Java \u865a\u62df\u673a\u4e5f\u90fd\u9ed8\u8ba4\u4e3a HotSpot VM\u3002<\/p>\n\n\n\n

\u90a3 GC \u662f\u4ec0\u4e48\u5462\uff1fGC \u7684\u5168\u79f0\u662f Garbage Collect\uff0c\u5373\u201c\u5783\u573e\u6536\u96c6\u201d\uff0c\u8bb0\u4f4f\u4e0d\u662f\u5927\u8857\u4e0a\u7684\u201c\u6536\u5783\u573e\u201d\uff01\u5f04\u61c2\u201c\u5783\u573e\u6536\u96c6\u201d\u4e4b\u524d\u5f97\u5148\u641e\u660e\u767d GC \u548c JVM \u662f\u4e2a\u4ec0\u4e48\u5173\u7cfb\uff1f\u6839\u636e\u300aJava \u865a\u62df\u673a\u89c4\u8303\u300b\u7684\u89c4\u5b9a\uff0c\u5b83\u6240\u7ba1\u7406\u7684\u5185\u5b58\u4f1a\u88ab\u5212\u5206\u4e3a\u51e0\u4e2a\u4e0d\u540c\u7684\u533a\u57df\uff08\u8be6\u60c5\u53c2\u8003\u300aJava\u5185\u5b58\u533a\u57df\u4e0e\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38\u300b<\/a>\u8fd9\u7bc7\u6587\u7ae0\uff09\u3002\u8fd9\u51e0\u4e2a\u533a\u57df\u4e2d\u6709\u4e24\u4e2a\u533a\u57df\uff0c\u4e00\u4e2a\u53eb\u201c\u5806\u201d\uff0c\u4e00\u4e2a\u53eb\u201c\u65b9\u6cd5\u533a\u201d\uff08JDK 8\u4e4b\u524d\uff09\u3002\u7531\u4e8e\u8fd9\u4e24\u5757\u533a\u57df\u7684\u5185\u5b58\u5206\u914d\u4e0e\u4f7f\u7528\u4e0d\u786e\u5b9a\u6027\u8f83\u5927\uff0c\u4e14\u5806\u5360\u7528\u7684\u5185\u5b58\u4e5f\u7279\u522b\u5927\uff0c\u6240\u4ee5\u300aJava \u865a\u62df\u673a\u89c4\u8303\u300b\u4f1a\u8981\u6c42\u865a\u62df\u673a\u5bf9\u8fd9\u4e24\u5757\u533a\u57df\u5b9e\u73b0\u201c\u5783\u573e\u6536\u96c6\u201d\u3002\u4e0d\u8fc7\u56e0\u4e3a\u65b9\u6cd5\u533a\u5177\u6709\u7279\u6b8a\u6027\uff08\u5b58\u50a8\u5185\u5bb9\u5bfc\u81f4\u8fdb\u884c\u56de\u6536\u7684\u6027\u4ef7\u6bd4\u8f83\u4f4e\uff09\uff0c\u5bf9\u65b9\u6cd5\u533a\u201c\u5783\u573e\u6536\u96c6\u201d\u7684\u5b9e\u73b0\u4e0d\u505a\u5f3a\u5236\u8981\u6c42\uff0c\u4f46\u662f\u4e00\u5b9a\u8981\u5b9e\u73b0\u5806\u4e0a\u7684\u201c\u5783\u573e\u6536\u96c6\u201d\u3002\u6240\u4ee5\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u8981\u8bf4\u7684\u5c31\u662f\u5806\u4e0a\u7684\u201c\u5783\u573e\u6536\u96c6\u201d\u3002<\/p>\n\n\n\n

new \u5173\u952e\u5b57<\/h3>\n\n\n\n

\u5199\u8fc7 Java \u7684\u540c\u5b66\uff0c\u5927\u90fd\u77e5\u9053\u901a\u8fc7 new <\/code>\u5173\u952e\u5b57\u6765\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u3002\u7531\u4e8e\u9ad8\u7ea7\u8bed\u8a00\u628a\u5e95\u5c42\u5de5\u4f5c\u505a\u7684\u5b9e\u5728\u592a\u597d\uff0c\u5bfc\u81f4\u5927\u591a\u6570\u540c\u5b66\u5e76\u4e0d\u4e86\u89e3 new<\/code> \u80cc\u540e\u7684\u7ec6\u8282\u662f\u4ec0\u4e48\uff1f\u6240\u4ee5\uff0c\u5728\u8fd9\u91cc\u6211\u4eec\u5f97\u5148\u6e05\u695a JVM \u5728\u201c\u770b\u201d\u5230\u4f60\u7684 new \u5173\u952e\u5b57\u540e\u4f1a\u6267\u884c\u54ea\u4e9b\u64cd\u4f5c\uff1f\u9996\u5148\u8fdb\u884c\u7c7b\u52a0\u8f7d\u68c0\u67e5<\/strong>\uff0c\u5f80\u540e\u4f9d\u6b21\u662f\u5206\u914d\u5185\u5b58<\/strong>\u3001\u521d\u59cb\u5316\u96f6\u503c<\/strong>\u3001\u8bbe\u7f6e\u5bf9\u8c61\u5934<\/strong>\u548c\u6267\u884c init \u65b9\u6cd5<\/strong>\u3002\u7531\u4e8e\u5199\u8fd9\u7bc7\u6587\u7ae0\u4e0d\u662f\u4e3a\u4e86\u628a JVM \u8bb2\u89e3\u7684\u9762\u9762\u4ff1\u5230\u7684\uff0c\u6240\u4ee5\u5bf9\u4e8e\u4e0a\u9762\u7684\u51e0\u4e2a\u6b65\u9aa4\u4e0d\u505a\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u3002\u6211\u4eec\u770b\u5230\u7b2c\u4e8c\u4e2a\u6b65\u9aa4\u5c31\u662f\u5206\u914d\u5185\u5b58<\/strong>\uff0c\u8fd9\u624d\u662f\u6211\u4eec\u5173\u6ce8\u7684\u91cd\u70b9\u3002\u8fd9\u91cc\u6240\u8fdb\u884c\u7684\u5206\u914d\u5185\u5b58\uff0c\u5219\u4f1a\u4ece\u5806\u4e0a\u5212\u5206\u4e00\u5757\u7a7a\u95f4\u7528\u4e8e\u521b\u5efa\u540e\u7684\u65b0\u5bf9\u8c61\u7684\u4f7f\u7528\u3002\uff08\u6ce8\uff1a\u6709\u4e24\u79cd\u5206\u914d\u65b9\u5f0f\uff0c\u7a7a\u95f2\u5217\u8868\u548c\u6307\u9488\u78b0\u649e\uff09<\/p>\n\n\n\n

\u770b\u5230\u8fd9\u91cc\uff0c\u5927\u5bb6\u5e94\u8be5\u660e\u767d\u521b\u5efa\u4e00\u4e2a\u65b0\u5bf9\u8c61\u7684\u65f6\u5019\u662f\u4f1a\u5360\u7528\u5806\u4e0a\u7684\u4e00\u90e8\u5206\u7a7a\u95f4\u7684\uff0c\u5373\u4f7f\u6240\u5360\u7528\u7684\u7a7a\u95f4\u5f88\u5c0f\uff0c\u603b\u5f52\u662f\u5360\u4e86\u3002\u6bd5\u7adf\u673a\u5668\u4e0a\u7684\u5185\u5b58\u7a7a\u95f4\u662f\u6709\u9650\u7684\uff0c\u4e0d\u53ef\u80fd\u8bf4\u8ba9\u4f60\u65e0\u4f11\u6b62\u7684\u53ea\u7528\u4e0d\u8fd8\u3002\u6240\u8c13\uff0c\u6709\u501f\u6709\u8fd8\uff0c\u518d\u501f\u4e0d\u96be\u561b\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5728\u5e38\u89c1\u7684 Web \u9879\u76ee\u4e2d\uff0c\u4f34\u968f\u7740\u7528\u6237\u7684\u4e00\u6b21 Http Request \u53ef\u80fd\u5c31\u4f1a\u521b\u5efa\u8bb8\u591a\u5bf9\u8c61\uff0c\u4f46\u7528\u6237\u5728\u6536\u5230\u671f\u671b\u7684 Http Response \u540e\uff0c\u4e2d\u95f4\u521b\u5efa\u7684\u4e00\u4e9b\u5bf9\u8c61\u57fa\u672c\u5c31\u4e0d\u4f1a\u7528\u5230\u4e86\u3002\u5728 Java \u7f16\u7a0b\u4e2d\u5e76\u6ca1\u6709\u8981\u6c42\u7a0b\u5e8f\u5458\u8d1f\u8d23\u81ea\u5df1\u6240\u521b\u5efa\u5bf9\u8c61\u7684\u56de\u6536\uff0c\u6240\u4ee5\u8fd9\u90e8\u5206\u5de5\u4f5c\u5c31\u4ea4\u7531\u4e86 JVM \u865a\u62df\u673a\u6765\u8d1f\u8d23\u3002\u800c\u8fd9\u91cc\u8bf4\u8981\u56de\u6536\u7684\u5bf9\u8c61\uff0c\u4e5f\u5c31\u662f\u524d\u9762\u63d0\u5230\u7684\u201c\u5783\u573e\u6536\u96c6\u201d\u4e2d\u7684\u5783\u573e\u3002<\/p>\n\n\n\n

\u5982\u4f55\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u9700\u8981\u56de\u6536\uff1f<\/h3>\n\n\n\n

\u201c\u6709\u501f\u6709\u8fd8\uff0c\u518d\u501f\u4e0d\u96be\u201d\uff0c\u4f46\u662f\u5982\u4f55\u5224\u65ad\u662f\u5426\u628a\u5df2\u5206\u914d\u7ed9\u5bf9\u8c61\u7684\u5185\u5b58\u8fd8\u56de\u53bb\u5462\uff1f\u5176\u5b9e\u5c31\u662f\u8981\u5224\u65ad\u5bf9\u8c61\u8fd8\u6709\u6ca1\u6709\u5b58\u5728\u7684\u4ef7\u503c\uff0c\u6ca1\u6709\u7684\u8bdd\u5c31\u5f97\u8d76\u7d27\u628a\u5730\u65b9\u201c\u817e\u5012\u201d\u51fa\u6765\u3002\u5982\u679c\u4f60\u521b\u5efa\u7684\u5bf9\u8c61\uff0c\u5b64\u96f6\u96f6\u7684\u6ca1\u6709\u4efb\u4f55\u5730\u65b9\u5f15\u7528\u5b83\u4e5f\u5c31\u53ef\u4ee5\u8ba4\u4e3a\u5e94\u8be5\u7ed3\u675f\u5b83\u7684\u201c\u751f\u547d\u201d\u4e86<\/strong>\u3002\u57fa\u4e8e\u8fd9\u4e00\u539f\u5219\uff0c\u51fa\u73b0\u4e86\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5<\/strong>\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u5c31\u662f\u5728\u5bf9\u8c61\u4e2d\u8bbe\u7f6e\u4e00\u4e2a\u5f15\u7528\u8ba1\u6570\u5668\uff0c\u6bcf\u5f53\u6709\u4e00\u4e2a\u5730\u65b9\u5f15\u7528\u5b83\u65f6\uff0c\u8ba1\u6570\u5668\u503c\u5c31\u52a0\u4e00\uff1b\u5f53\u5f15\u7528\u5931\u6548\u65f6\uff0c\u8ba1\u6570\u5668\u503c\u5c31\u51cf\u4e00\u3002\u6240\u4ee5\u53ea\u8981\u53d1\u73b0\u67d0\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u5668\u4e3a\u96f6\uff0c\u90a3\u4e48\u5c31\u8ba4\u4e3a\u5b83\u662f\u4e0d\u53ef\u80fd\u88ab\u518d\u4f7f\u7528\u7684\uff0c\u5b83\u5728\u5806\u4e2d\u6240\u5360\u6709\u7684\u5185\u5b58\u5c31\u53ef\u4ee5\u88ab\u8fd8\u56de\u53bb\u4e86\u3002\u806a\u660e\u7684\u540c\u5b66\u80af\u5b9a\u4e00\u773c\u5c31\u770b\u51fa\u6765\u4e86\u8fd9\u4e2a\u7b97\u6cd5\u7684\u7f3a\u70b9\u3002\u90a3\u5c31\u662f\u5f53\u4e24\u4e2a\u5bf9\u8c61\u5b58\u5728\u4e92\u76f8\u5f15\u7528\u7684\u65f6\u5019\uff0c\u4f1a\u5bfc\u81f4\u5b83\u4eec\u7684\u8ba1\u6570\u5668\u90fd\u4e0d\u4e3a\u96f6\uff0c\u4e5f\u5c31\u4f1a\u53d8\u6210\u201c\u957f\u751f\u4e0d\u8001\u201d\u7684\u5bf9\u8c61\u3002\u6240\u4ee5\uff0cJVM \u5e76\u6ca1\u6709\u91c7\u7528\u8fd9\u79cd\u7b97\u6cd5\u3002<\/p>\n\n\n\n

\u9664\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5\u5916\uff0c\u8fd8\u6709\u4e00\u4e2a\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5<\/strong>\u3002\u8fd9\u4e2a\u7b97\u6cd5\u7684\u57fa\u672c\u601d\u8def\u662f\u901a\u8fc7\u4e00\u7cfb\u5217\u79f0\u4e3a\u201cGC Roots\u201d\u7684\u6839\u5bf9\u8c61\u4f5c\u4e3a\u8d77\u59cb\u8282\u70b9\u96c6\uff0c\u4ece\u8fd9\u4e9b\u8282\u70b9\u5f00\u59cb\uff0c\u6839\u636e\u5f15\u7528\u5173\u7cfb\u5411\u4e0b\u641c\u7d22\uff0c\u641c\u7d22\u8fc7\u7a0b\u6240\u8d70\u7684\u8def\u5f84\u79f0\u4e3a\u201c\u5f15\u7528\u94fe\u201d\uff08Reference Chain\uff09\uff0c\u5982\u679c\u67d0\u4e2a\u5bf9\u8c61\u5230 GC Roots \u95f4\u6ca1\u6709\u4efb\u4f55\u5f15\u7528\u94fe\u76f8\u8fde\uff0c\u90a3\u4e48\u5c31\u8bc1\u660e\u6b64\u5bf9\u8c61\u6ca1\u6709\u5b58\u5728\u7684\u4ef7\u503c\u4e86\u3002\u7b97\u6cd5\u5e76\u4e0d\u590d\u6742\uff0c\u5176\u4e2d GC Roots \u7684\u9009\u53d6\u6bd4\u8f83\u503c\u5f97\u6ce8\u610f\u3002\u5728 Java \u6280\u672f\u4f53\u7cfb\u4e2d\uff0c\u5e38\u4f5c\u4e3a GC Roots \u7684\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a\u865a\u62df\u673a\u6808\u4e2d\u5f15\u7528\u7684\u5bf9\u8c61\uff1b\u65b9\u6cd5\u533a\u4e2d\u7c7b\u9759\u6001\u5c5e\u6027\u548c\u5e38\u91cf\u5f15\u7528\u7684\u5bf9\u8c61\uff1bJava \u865a\u62df\u673a\u5185\u90e8\u7684\u5f15\u7528\u7b49\u3002\u5f53\u7136\u4e5f\u4e0d\u6b62\u4e0a\u8ff0\u5bf9\u8c61\uff0cJVM \u4f1a\u6839\u636e\u4e0d\u540c\u7684\u5783\u573e\u6536\u96c6\u5668\u548c\u6536\u96c6\u533a\u57df\u52a8\u6001\u8c03\u6574 GC Roots \u96c6\u5408\u3002<\/p>\n\n\n\n

\u81f3\u6b64\uff0c\u6211\u4eec\u77e5\u9053\u4e86\u4e3a\u4ec0\u4e48\u8981\u8fdb\u884c GC \uff1f\u4e3b\u8981\u5728 JVM \u6240\u7ba1\u7406\u7684\u5185\u5b58\u7684\u54ea\u4e2a\u533a\u57df\u8fdb\u884c GC\uff1f\u4ee5\u53ca\u5982\u4f55\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u53ef\u4ee5\u88ab\u56de\u6536\uff1f\uff08\u4ed4\u7ec6\u60f3\u4e00\u60f3\uff0c\u56de\u7b54\u4e0d\u4e0a\u6765\u5c31\u5f97\u518d\u7ffb\u5230\u524d\u9762\u597d\u597d\u770b\u4e00\u4e0b\u4e86<\/span>\uff09<\/p>\n\n\n\n

\u5206\u4ee3\u6536\u96c6<\/h3>\n\n\n\n

\u90a3\u63a5\u4e0b\u91cc\u5e94\u8be5\u51c6\u5907\u505a\u4ec0\u4e48\u554a\uff1f\u65e2\u7136\u77e5\u9053\u5982\u4f55\u627e\u5230\u9700\u8981\u56de\u6536\u7684\u5bf9\u8c61\uff0c\u80af\u5b9a\u662f\u8be5\u7422\u78e8\u7740\u600e\u4e48\u6837\u56de\u6536\u3002<\/p>\n\n\n\n

\u5148\u522b\u7740\u6025\u7740\u8bf4\u201c\u56de\u6536\u4e0d\u5c31\u662f\u628a\u5206\u914d\u51fa\u53bb\u7684\u5185\u5b58\u6536\u56de\u6765\u554a\u201d\u3002\u8981\u77e5\u9053\uff0c\u5728\u8ba1\u7b97\u673a\u7684\u4e16\u754c\u91cc\u6709\u4e00\u4e9b\u89c4\u77e9\u4e00\u662f\u8bb2\u7a76\u9ad8\u6548\u7387\u505a\u4e8b\uff1b\u4e8c\u662f\u5e0c\u671b\u65e2\u60f3\u9a6c\u513f\u8dd1\uff0c\u53c8\u60f3\u9a6c\u513f\u5c11\u5403\u8349\u3002\u6240\u4ee5\uff0cJVM \u4e2d\u5b9e\u73b0\u7684\u5783\u573e\u6536\u96c6\u5668\u5728\u5de5\u4f5c\u65f6\u5360\u7528\u7684\u8d44\u6e90\u8981\u5c3d\u91cf\u5c11\uff0c\u5207\u52ff\u672c\u672b\u5012\u7f6e\uff1b\u53e6\u5916\u6536\u96c6\u8fc7\u7a0b\u5e94\u5c3d\u91cf\u51cf\u5c0f\u5bf9\u7528\u6237\u7ebf\u7a0b\u7684\u5f71\u54cd\uff0c\u4fdd\u8bc1\u7528\u6237\u7ebf\u7a0b\u80fd\u591f\u9ad8\u6548\u5de5\u4f5c\uff0c\u4ece\u800c\u5e26\u7ed9\u7528\u6237\u826f\u597d\u7684\u4f53\u9a8c\u3002<\/p>\n\n\n\n

\u57fa\u4e8e\u4e0a\u8ff0\u7684\u8981\u6c42\uff0c\u806a\u660e\u7684\u4eba\u4eec\u5f00\u59cb\u601d\u8003\u5e94\u8be5\u600e\u4e48\u6837\u66f4\u5feb\u3001\u66f4\u597d\u7684 GC\u3002\u8fd9\u91cc\u9996\u5148\u4f1a\u4ecb\u7ecd\u4e00\u4e2a\u201c\u5206\u4ee3\u6536\u96c6<\/strong>\u201d\u7406\u8bba\uff0c\u6216\u8bb8\u6709\u4e9b\u7a81\u7136\u4f46\u662f\u5e76\u4e0d\u96be\u7406\u89e3\uff0c\u662f\u4eba\u4eec\u4e3a\u4e86\u66f4\u597d\u7684\u5b9e\u73b0\u6536\u96c6\u5668\u63d0\u51fa\u7684\u3002\u5206\u4ee3\u6536\u96c6\u4f9d\u8d56\u4e24\u4e2a\u5206\u4ee3\u5047\u8bf4\uff1a\u4e00\u662f\u5f31\u5206\u4ee3\u5047\u8bf4\uff0c\u7edd\u5927\u591a\u6570\u5bf9\u8c61\u90fd\u662f\u671d\u751f\u5915\u706d\u7684\uff1b\u4e8c\u662f\u5f3a\u5206\u4ee3\u5047\u8bf4\uff0c\u71ac\u8fc7\u8d8a\u591a\u6b21\u5783\u573e\u6536\u96c6\u8fc7\u7a0b\u7684\u5bf9\u8c61\u8d8a\u96be\u88ab\u56de\u6536<\/span><\/strong>\u3002\u4ed4\u7ec6\u60f3\u60f3\uff0c\u662f\u4e0d\u662f\u4e5f\u633a\u5408\u7406\u7684\u3002\u5e38\u7528\u7684\u51e0\u6b3e\u7ecf\u5178\u5783\u573e\u6536\u96c6\u5668\u5c31\u5c06 Java \u5806\u5212\u5206\u4e3a\u4e86\u4e0d\u540c\u7684\u533a\u57df\uff0c\u6839\u636e\u5bf9\u8c61\u5e74\u9f84\u5206\u522b\u5b58\u50a8\u4e0d\u540c\u533a\u57df\u3002<\/p>\n\n\n\n

\u6709\u597d\u5947\u7684\u540c\u5b66\u53ef\u80fd\u4f1a\u8bf4\u201c\u6211\u4e0d\u5212\u5206\u533a\u57df\u201d\u53c8\u80fd\u600e\u4e48\u6837\u5462\uff1f<\/p>\n\n\n\n

\u4f60\u8fd9\u4e48\u60f3\u4e00\u4e0b\uff0c\u5047\u5982\u4e0d\u5212\u5206\u533a\u57df\u5c31\u76f8\u5f53\u4e8e\u6240\u6709\u5bf9\u8c61\u90fd\u5728\u8fd9\u4e48\u4e00\u5757\u5185\u5b58\u4e0a\u5b58\u50a8\u7740\u3002\u5f53\u5f00\u59cb\u6536\u96c6\u7684\u65f6\u5019\uff0c\u80af\u5b9a\u8981\u8fdb\u884c\u6807\u8bb0\uff08\u4e0d\u540c\u7684\u6536\u96c6\u5668\u6807\u8bb0\u7b56\u7565\u4e0d\u540c\uff0c\u4e0d\u8fc7\u6309\u5f53\u524d\u7ecf\u5178\u5783\u573e\u6536\u96c6\u5668\u7684\u7b56\u7565\u603b\u4f1a\u5728\u67d0\u4e2a\u6807\u8bb0\u9636\u6bb5\u6682\u505c\u6240\u6709\u7528\u6237\u7ebf\u7a0b\u7684<\/span><\/em>\uff09\u9700\u8981\u56de\u6536\u7684\u5bf9\u8c61\uff0c\u5728\u6807\u8bb0\u8fc7\u7a0b\u65f6\u9700\u8981\u6682\u505c\u8bbf\u95ee\u6b64\u5185\u5b58\u533a\u57df\u7684\u6240\u6709\u7528\u6237\u7ebf\u7a0b\uff0c\u8fd9\u4e2a\u201c\u4e00\u5200\u5207\u201d\u7684\u7b56\u7565\u56fa\u7136\u7b80\u5355\uff0c\u4f46\u5374\u4e0d\u662f\u6700\u597d\u7684\u3002\u5047\u5982\uff0c\u6839\u636e\u5404\u5bf9\u8c61\u7684\u5e74\u9f84\u5206\u522b\u5b58\u50a8\u5728\u4e0d\u540c\u7684\u533a\u57df\uff0c\u201c\u671d\u751f\u5915\u706d\u201d\u7684\u5bf9\u8c61\u653e\u5728\u4e00\u4e2a\u533a\u57df\uff0c\u201c\u5e74\u9f84\u5927\u201d\u7684\u5bf9\u8c61\u653e\u5728\u4e00\u4e2a\u533a\u57df\u3002\u8fd9\u6837\u9488\u5bf9\u4e0d\u540c\u7684\u533a\u57df\u53ef\u4ee5\u4f7f\u7528\u4e0d\u540c\u7684\u7b56\u7565\u6765\u56de\u6536\uff0c\u5bf9\u4e8e\u201c\u6d3b\u8dc3\u201d\u533a\u57df\u7684\u6536\u96c6\u9891\u7387\u53ef\u4ee5\u9ad8\u4e00\u4e9b\uff0c\u9488\u5bf9\u67d0\u4e2a\u533a\u57df GC \u65f6\u4e5f\u5e76\u4e0d\u4f1a\u5f71\u54cd\u7528\u6237\u7ebf\u7a0b\u8bbf\u95ee\u5176\u5b83\u533a\u57df\u7b49\u3002<\/p>\n\n\n\n

\u5728\u5546\u7528\u7684 Java \u865a\u62df\u673a\u4e2d\uff0c\u4e00\u822c\u90fd\u81f3\u5c11\u4f1a\u628a Java \u5806\u5212\u5206\u4e3a\u65b0\u751f\u4ee3\uff08Young Generation\uff09<\/strong>\u548c\u8001\u5e74\u4ee3\uff08Old Generation\uff09<\/strong>\u4e24\u4e2a\u533a\u57df\u3002\u65b0\u751f\u4ee3\uff0c\u5c31\u662f\u524d\u9762\u6211\u4eec\u8bf4\u7684\u5b58\u653e\u201c\u671d\u751f\u5915\u706d\u201d\u7684\u5bf9\u8c61\u7684\u533a\u57df\u3002\u5f53\u7136\u6bcf\u6b21\u5728\u65b0\u751f\u4ee3\u533a\u57df\u56de\u6536\u8fc7\u540e\uff0c\u8fbe\u5230\u4e00\u5b9a\u201c\u5e74\u9f84\u201d\u7684\u5bf9\u8c61\u5219\u4f1a\u88ab\u653e\u5230\u8001\u5e74\u4ee3\u4e2d\u3002\u73b0\u5728\uff0c\u6211\u4eec\u53ef\u4ee5\u6765\u5206\u6790\u8fd9\u4e24\u5757\u533a\u57df\u5404\u81ea\u7684\u7279\u70b9\u4e86\u3002<\/p>\n\n\n\n

\u5728\u65b0\u751f\u4ee3\u4e0a\u7684 GC \u88ab\u79f0\u4e3a Minor GC\uff0fYoung GC\uff0c\u7531\u4e8e\u6b64\u5904\u7684\u5bf9\u8c61\u4e0d\u6613\u201c\u5b58\u6d3b\u201c\uff0c\u4ece\u800c\u5728\u4e00\u6b21\u6536\u96c6\u8fc7\u540e\u5e94\u8be5\u4f1a\u4ea7\u751f\u5927\u91cf\u7684\u7a7a\u95f2\u5185\u5b58\u3002\u5728\u8001\u5e74\u4ee3\u4e0a\u7684 GC \u88ab\u79f0\u4e3a Major GC\uff0fOld GC\uff0c\u6bcf\u6b21\u6536\u96c6\u53ef\u80fd\u53ea\u80fd\u56de\u6536\u5f88\u5c11\u5bf9\u8c61\u3002\u9664\u4e86\u4f1a\u5355\u72ec\u5728\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\u4e0a\u6536\u96c6\uff0c\u5728\u5185\u5b58\u4e25\u91cd\u4e0d\u8db3\u65f6\u8fd8\u53ef\u80fd\u4f1a\u89e6\u53d1\u6574\u5806\u6536\u96c6\uff08Full GC\uff09\uff0c\u8981\u5c3d\u91cf\u51cf\u5c11 Full GC \u7684\u51fa\u73b0\u3002<\/p>\n\n\n\n

\u5783\u573e\u56de\u6536\u7b97\u6cd5<\/h3>\n\n\n\n

\u65e2\u7136\u77e5\u9053\u4e86\u4e3a\u4ec0\u4e48\u8981\u5bf9 Java \u5806\u5212\u5206\u533a\u57df\u4ee5\u53ca\u5404\u533a\u57df\u7684\u7279\u70b9\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba4\u8bc6\u4e00\u4e0b\u4e09\u79cd\u201c\u5783\u573e\u56de\u6536\u201d\u7b97\u6cd5\u3002\u4f60\u4e5f\u53ef\u4ee5\u8ba4\u4e3a\u662f\u201c\u5783\u573e\u56de\u6536\u201d\u7684\u65b9\u6cd5\u8bba\u3002<\/p>\n\n\n\n

\u201c\u6807\u8bb0-\u6e05\u9664\u201d\u7b97\u6cd5<\/strong><\/h4>\n\n\n\n

\u201c\u6807\u8bb0-\u6e05\u9664\u201d\u7b97\u6cd5<\/strong>\uff0c\u6807\u8bb0\u6307\u7684\u5219\u662f\u6807\u8bb0\u5bf9\u8c61\uff08\u6807\u8bb0\u5f85\u56de\u6536\u6216\u975e\u56de\u6536\u7684\u90fd\u884c\uff0c\u53ea\u8981\u80fd\u533a\u5206\u51fa\u4e24\u7c7b\u5bf9\u8c61\u5373\u53ef\uff09\uff0c\u6e05\u9664\u5219\u662f\u628a\u65e0\u7528\u7684\u5bf9\u8c61\u4ece\u5185\u5b58\u4e2d\u6e05\u9664\u6389\u3002\u53ef\u4ee5\u770b\u51fa\uff0c\u8fd9\u662f\u6bd4\u8f83\u7b80\u5355\u7684\u4e00\u79cd\u7b56\u7565\uff0c\u5148\u53d1\u73b0\u540e\u6e05\u9664\u3002\u4e0d\u8fc7\uff0c\u8fd9\u79cd\u7b97\u6cd5\u4f1a\u4ea7\u751f\u8bb8\u591a\u5185\u5b58\u788e\u7247\uff0c\u7531\u4e8e\u8fc7\u591a\u5185\u5b58\u788e\u7247\u7684\u5b58\u5728\u53ef\u80fd\u5728\u51fa\u73b0\u8f83\u5927\u5bf9\u8c61\u65f6\u65e0\u53d1\u5206\u914d\u4ece\u800c\u5bfc\u81f4\u518d\u6b21\u89e6\u53d1\u4e00\u6b21\u5783\u573e\u6536\u96c6\u52a8\u4f5c\uff1b\u800c\u4e14\u968f\u7740\u5bf9\u8c61\u6570\u91cf\u7684\u589e\u52a0\u6807\u8bb0\u548c\u6e05\u9664\u7684\u65f6\u957f\u4e5f\u4f1a\u589e\u52a0\u3002<\/p>\n\n\n\n

\u201c\u6807\u8bb0-\u590d\u5236\u201d\u7b97\u6cd5<\/strong><\/h4>\n\n\n\n

\u201c\u6807\u8bb0-\u590d\u5236\u201d\u7b97\u6cd5<\/strong>\uff0c\u6807\u8bb0\u4e0d\u505a\u8fc7\u591a\u4ecb\u7ecd\u4e86\u3002\u8bf4\u4e00\u4e0b\u590d\u5236\u7b56\u7565\uff0c\u8fd9\u4e2a\u7b97\u6cd5\u662f\u5c06\u5185\u5b58\u7a7a\u95f4\u5206\u4e3a\u4e24\u90e8\u5206\uff0c\u5404\u5360\u4e00\u534a\u3002\u4f46\u662f\u53ea\u7ed9 JVM \u4f7f\u7528\u4e00\u90e8\u5206\u7684\u5185\u5b58\uff0c\u53e6\u4e00\u90e8\u5206\u7a7a\u7740\u3002\u53e6\u4e00\u90e8\u5206\u4ec0\u4e48\u65f6\u5019\u7528\u5462\uff1f\u5c31\u662f\u5728\u4f7f\u7528\u7684\u8fd9\u90e8\u5206\u5185\u5b58\u4e0a\u53d1\u751f GC \u65f6\uff0c\u628a\u672a\u6807\u8bb0\u7684\u5bf9\u8c61\uff08\u5b58\u6d3b\uff09\u5168\u90fd\u590d\u5236\u5230\u53e6\u4e00\u90e8\u5206\u7a7a\u95f2\u5185\u5b58\u4e2d\u5e76\u653e\u5230\u4e00\u8d77\uff0c\u7136\u540e\u5728\u628a\u4e4b\u524d\u4f7f\u7528\u7684\u90a3\u90e8\u5206\u5185\u5b58\u6570\u636e\u5168\u90fd\u6e05\u7406\u6389\uff0c\u8f6e\u6362\u7740\u4f7f\u7528\u4e24\u5757\u7a7a\u95f4\u3002\u5176\u5b9e\u8fd9\u662f\u4ee5\u727a\u7272\u7a7a\u95f4\u4e3a\u4ee3\u4ef7\uff0c\u6765\u89e3\u51b3\u7684\u5185\u5b58\u788e\u7247\u95ee\u9898\u3002\u8fd9\u79cd\u65b9\u5f0f\u5bf9\u4e8e\u5185\u5b58\u5206\u914d\u4e5f\u7279\u522b\u53cb\u597d\uff0c\u5982\u679c\u4e0d\u5728\u4e4e\u7a7a\u95f4\u6d6a\u8d39\u7684\u95ee\u9898\uff0c\u8fd9\u4f3c\u4e4e\u662f\u4e2a\u7279\u522b\u597d\u7684\u65b9\u6cd5\u3002\u4e0d\u8fc7\uff0c\u5728\u201c\u5bf8\u5185\u5b58\uff0c\u5bf8\u91d1\u201d\u7684\u8ba1\u7b97\u673a\u4e2d\uff0c\u600e\u4e48\u53ef\u80fd\u4e0d\u5728\u4e4e\u7a7a\u95f4\uff01\u6240\u4ee5\uff0c\u6709\u4eba\u63d0\u51fa\u4e86\u4f18\u5316\u7248\u672c\u7684\u7b97\u6cd5\u2014\u2014Appel \u5f0f\u56de\u6536\u3002\u6539\u8fdb\u540e\u7684\u7248\u672c\uff0c\u5e76\u6ca1\u6709\u7b80\u5355\u76f4\u63a5\u7684\u5c06\u7a7a\u95f4\u5bf9\u7b49\u5206\u4e3a\u4e24\u90e8\u5206\uff0c\u800c\u662f\u5206\u4e3a\u4e86\u4e09\u90e8\u5206\u3002Appel \u5f0f\u56de\u6536\u628a\u65b0\u751f\u4ee3\u5206\u4e3a\u4e86\u4e00\u5757\u8f83\u5927\u7684 Eden \u7a7a\u95f4\u548c\u4e24\u5757\u8f83\u5c0f\u7684 Survivor \u7a7a\u95f4\uff0c\u5de5\u4f5c\u65f6\u53ea\u4f7f\u7528 Eden \u548c \u5176\u4e2d\u4e00\u5757 Survivor \u7a7a\u95f4\uff08HotSpot VM \u4e2d\u9ed8\u8ba4 Eden:Survivor \u4e3a 8:1<\/em>\uff09\u3002\u5982\u679c\u53d1\u751f\u4e86 GC\uff0c\u90a3\u4e48\u5c31\u5c06 Eden \u548c Survivor \u4e2d\u5b58\u6d3b\u7684\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u4e00\u5757\u7a7a\u95f2\u7684 Survivor \u7a7a\u95f4\u4e2d\u3002\u6539\u8fdb\u540e\u7684\u7b97\u6cd5\u5927\u5927\u51cf\u5c11\u4e86\u5907\u7528\u7a7a\u95f4\u7684\u5927\u5c0f\uff0c\u901a\u8fc7\u8fd9\u79cd\u5212\u5206\u89e3\u51b3\u4e86\u5341\u5206\u6d6a\u8d39\u5185\u5b58\u7a7a\u95f4\u7684\u95ee\u9898\u3002\u80fd\u591f\u8fdb\u884c\u8fd9\u79cd\u5212\u5206\u4e5f\u5f97\u76ca\u4e8e\u65b0\u751f\u4ee3\u6bcf\u6b21 GC \u4f1a\u56de\u6536\u6389\u5927\u90e8\u5206\u5bf9\u8c61\u7684\u7279\u70b9\u3002\u4e0d\u8fc7\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u5907\u7528\u7a7a\u95f4 Survivor \u8fc7\u5c0f\uff0c\u5bfc\u81f4\u4e00\u6b21 GC \u540e\u653e\u4e0d\u4e0b\u6240\u6709\u7684\u5b58\u6d3b\u5bf9\u8c61\u7684\u60c5\u51b5\uff0c\u6240\u4ee5\u8fd8\u9700\u8981\u8001\u5e74\u4ee3\u505a\u5206\u914d\u62c5\u4fdd\u3002\u8fd9\u4e2a\u7b97\u6cd5\u5c31\u6bd4\u8f83\u9002\u5408\u5728\u65b0\u751f\u4ee3\u4f7f\u7528\u3002<\/p>\n\n\n\n

\u201c\u6807\u8bb0-\u6574\u7406\u201d\u7b97\u6cd5<\/strong><\/h4>\n\n\n\n

\u201c\u6807\u8bb0-\u6574\u7406\u201d\u7b97\u6cd5<\/strong>\uff0c\u6b63\u5982\u5176\u540d\uff0c\u5728\u6807\u8bb0\u5b8c\u6210\u4e4b\u540e\uff0c\u5148\u5c06\u6240\u6709\u7684\u5b58\u6d3b\u5bf9\u8c61\u79fb\u5411\u5185\u5b58\u7a7a\u95f4\u7684\u4e00\u7aef\uff0c\u7136\u540e\u518d\u6e05\u9664\u8fb9\u754c\u4ee5\u5916\u7684\u5185\u5b58\u3002\u901a\u8fc7\u5728\u6807\u8bb0\u540e\u5bf9\u5185\u5b58\u7684\u201c\u6574\u7406\u201d\u52a8\u4f5c\uff0c\u4ece\u800c\u907f\u514d\u4e86\u201c\u6807\u8bb0-\u6e05\u9664\u201d\u7b97\u6cd5\u4ea7\u751f\u5927\u91cf\u5185\u5b58\u788e\u7247\u7684\u95ee\u9898\u3002\u7b97\u6cd5\u793a\u610f\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n

\"\"
\u201c\u6807\u8bb0-\u6574\u7406\u201d\u7b97\u6cd5\u793a\u610f\u56fe<\/figcaption><\/figure><\/div>\n\n\n\n

\u7ecf\u5178\u5783\u573e\u6536\u96c6\u5668<\/h3>\n\n\n\n

\u201c\u5149\u8bf4\u4e0d\u7ec3\u5047\u628a\u5f0f\uff0c\u5149\u7ec3\u4e0d\u8bf4\u50bb\u628a\u5f0f\u201d\uff0c\u6240\u4ee5\u4e0d\u80fd\u53ea\u8bb2\u7406\u8bba\u5c42\u9762\u7684\u77e5\u8bc6\uff0c\u63a5\u4e0b\u6765\u4ecb\u7ecd\u51e0\u6b3e\u5783\u573e\u6536\u96c6\u5668\u3002\u603b\u4e4b\uff0c\u524d\u9762\u6240\u8bb2\u7684\u6240\u6709\u5185\u5bb9\u6700\u7ec8\u90fd\u662f\u8981\u4e3a\u5b9e\u73b0\u5783\u573e\u6536\u96c6\u5668\u670d\u52a1\u7684\uff0c\u6bd5\u7adf\u6536\u96c6\u5668\u624d\u662f\u6700\u7ec8\u201c\u5e72\u6d3b\u201d\u7684\u3002<\/p>\n\n\n\n

\"\"
\u7ecf\u5178\u5783\u573e\u6536\u96c6\u5668<\/figcaption><\/figure><\/div>\n\n\n\n

\u770b\u5230\u4e0a\u56fe\uff0c\u53ef\u80fd\u5bf9\u4f60\u8ba4\u8bc6\u8fd9\u51e0\u6b3e\u6536\u96c6\u5668\u5e76\u6ca1\u6709\u592a\u5927\u4f5c\u7528\u3002\u6240\u4ee5\uff0c\u8fd8\u9700\u8981\u4e0b\u9762\u8fd9\u5e45\u56fe\u6765\u5e2e\u52a9\u4f60\u7406\u89e3\u548c\u8bb0\u5fc6\u3002<\/p>\n\n\n\n

\"\"
HotSpot \u865a\u62df\u673a\u7684\u5783\u573e\u6536\u96c6\u5668<\/figcaption><\/figure><\/div>\n\n\n\n

Serial \u6536\u96c6\u5668<\/h4>\n\n\n\n

Serial \u6536\u96c6\u5668\uff08\u6807\u8bb0-\u590d\u5236\uff09\uff0c\u4ece\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa\u5b83\u662f\u5de5\u4f5c\u5728\u65b0\u751f\u4ee3\u7684\u6536\u96c6\u5668\u3002\u7531\u4e8e\u201c\u51fa\u751f\u65e9\u201d\uff0c\u6240\u4ee5\u7b56\u7565\u4e5f\u5f88\u7b80\u5355\uff0c\u5728\u8fdb\u884c GC \u65f6\u53ea\u6709\u4e00\u4e2a GC \u7ebf\u7a0b\u5de5\u4f5c\uff08\u5355\u7ebf\u7a0b\uff09\uff0c\u800c\u4e14\u8fd8\u9700\u8981\u6682\u505c\u5176\u4ed6\u6240\u6709\u7684\u5de5\u4f5c\u7ebf\u7a0b\uff08Stop The World\uff09\u3002\u5f53\u7136\uff0c\u4e5f\u4e0d\u80fd\u53ea\u770b\u5230\u5b83\u7684\u7f3a\u70b9\uff0c\u76ee\u524d\u5b83\u4ecd\u662f HotSpot VM \u5ba2\u6237\u7aef\u6a21\u5f0f\u4e0b\u9ed8\u8ba4\u7684\u65b0\u751f\u4ee3\u5783\u573e\u6536\u96c6\u5668\uff0c\u7531\u4e8e\u7b56\u7565\u7b80\u5355\u5b83\u5185\u5b58\u8d44\u6e90\u6d88\u8017\u6700\u5c11\u7684\u6536\u96c6\u5668\u3002\u5728\u5355\u6838\u5904\u7406\u5668\u7684\u670d\u52a1\u5668\u4e2d\uff0c\u7531\u4e8e\u6ca1\u6709\u7ebf\u7a0b\u4ea4\u4e92\u7684\u5f00\u9500\uff0c\u6b63\u597d\u53ef\u4ee5\u83b7\u5f97\u6700\u9ad8\u7684\u5355\u7ebf\u7a0b\u6536\u96c6\u6548\u7387\u3002<\/p>\n\n\n\n

ParNew \u6536\u96c6\u5668<\/h4>\n\n\n\n

ParNew \u6536\u96c6\u5668\uff08\u6807\u8bb0-\u590d\u5236\uff09\uff0c\u4f5c\u4e3a Serial \u7684\u591a\u7ebf\u7a0b\u7248\u672c\u5e76\u6ca1\u6709\u5e26\u6765\u66f4\u591a\u7684\u521b\u65b0\uff0c\u901a\u5e38\u4e0e CMS \u914d\u5408\u5de5\u4f5c\u3002\u5b83\u9ed8\u8ba4\u5f00\u542f\u7684\u6536\u96c6\u7ebf\u7a0b\u6570\u4e0e\u5904\u7406\u5668\u6838\u5fc3\u6570\u91cf\u76f8\u540c\uff0c\u4e0d\u8fc7\u4e5f\u53ef\u4ee5\u4f7f\u7528 -XX:ParallelGCThreads<\/code> \u53c2\u6570\u6765\u8bbe\u7f6eGC \u7ebf\u7a0b\u6570\u91cf\u3002<\/p>\n\n\n\n

Parallel Scavenge \u6536\u96c6\u5668<\/h4>\n\n\n\n

Parallel Scavenge \u6536\u96c6\u5668\uff08\u6807\u8bb0-\u590d\u5236\uff09\uff0c\u540c\u6837\u662f\u5de5\u4f5c\u5728\u65b0\u751f\u4ee3\u80fd\u591f\u5e76\u884c\u6536\u96c6\u7684\u591a\u7ebf\u7a0b\u6536\u96c6\u5668\u3002\u5b83\u8ffd\u6c42\u4f7f JVM \u8fbe\u5230\u4e00\u4e2a\u53ef\u63a7\u5236\u7684\u541e\u5410\u91cf\uff08\u8fd0\u884c\u7528\u6237\u4ee3\u7801\u65f6\u95f4\u4e0e\u8fd0\u884c\u7528\u6237\u4ee3\u7801\u52a0\u4e0a\u6267\u884cGC\u5b9e\u9645\u7684\u6bd4\u503c\uff09\u3002<\/p>\n\n\n\n

\u541e\u5410\u91cf = \u8fd0\u884c\u7528\u6237\u4ee3\u7801\u65f6\u95f4\/(\u8fd0\u884c\u7528\u6237\u4ee3\u7801\u65f6\u95f4+\u5783\u573e\u8fd0\u884c\u65f6\u95f4)<\/code><\/pre>\n\n\n\n
\u4e3a\u4e86\u8fdb\u884c\u6709\u6548\u63a7\u5236\uff0cParallel Scavenge \u63d0\u4f9b\u4e86\u4e24\u4e2a\u53c2\u6570\u6765\u8fdb\u884c\u7cbe\u786e\u63a7\u5236\uff0c\u4e00\u4e2a\u662f\u7528\u6765\u63a7\u5236\u6700\u5927\u5783\u573e\u6536\u96c6\u505c\u987f\u65f6\u95f4\u7684 -XX: MaxGCPauseMillis<\/code> \u53c2\u6570\uff1b\u4e00\u4e2a\u662f\u7528\u4e8e\u8bbe\u7f6e\u541e\u5410\u91cf\u5927\u5c0f\u7684 -XX: GCTimeRatio \u53c2\u6570\u3002<\/p>\n\n\n\n
-XX: MaxGCPauseMillis<\/code> \u53c2\u6570\u53ef\u4ee5\u8bbe\u7f6e\u4e3a\u4e00\u4e2a\u5927\u4e8e 0 \u7684\u6beb\u79d2\u6570\uff0c\u6536\u96c6\u5668\u5c3d\u529b\u4fdd\u8bc1\u6bcf\u6b21GC\u6240\u82b1\u8d39\u7684\u65f6\u95f4\u4e0d\u8d85\u8fc7\u8fd9\u4e2a\u503c\u3002\u5f53\u7136\u5982\u679c\u8bbe\u7f6e\u7684\u8fc7\u5c0f\uff0c\u6536\u96c6\u5668\u4e3a\u4e86\u4fdd\u8bc1\u4e0d\u8d85\u8fc7\u6b64\u503c\u5f80\u5f80\u4f1a\u9891\u7e41\u7684\u8fdb\u884c GC\u3002<\/p>\n\n\n\n
-XX: GCTimeRatio<\/code> \u53c2\u6570\u53ef\u4ee5\u8bbe\u7f6e\u4e3a\u4e00\u4e2a\u5927\u4e8e 0 \u5c0f\u4e8e 100 \u7684\u6574\u6570\u3002\u5047\u8bbe\u8bbe\u7f6e\u4e3a n\uff0c\u90a3\u4e481\/(n+1)<\/code> \u5219\u662f\u5783\u573e\u6536\u96c6\u65f6\u95f4\u5360\u603b\u65f6\u95f4\u7684\u6bd4\u7387\uff0c\u5373\u7cfb\u7edf\u5c06\u82b1\u8d39\u4e0d\u8d85\u8fc7\u603b\u65f6\u95f4\u76841\/(n+1)<\/code>\u7528\u4e8e\u5783\u573e\u6536\u96c6\u3002\uff08GC \u53c2\u8003\u6587\u6863\u4e2d\u63cf\u8ff0\u4e3a\u201c-XX: GCTimeRatio=nnn, The ratio of garbage Collection time to application time is 1\/(1+nnn)\u201d\uff09\u3002\u901a\u8fc7\u7b80\u5355\u7684\u516c\u5f0f\u63a8\u5bfc\u4e5f\u53ef\u4ee5\u8bc1\u660e 1\/(n+1) \u4e3a\u541e\u5410\u91cf\u7684\u5012\u6570\u3002<\/p>\n\n\n\n
\u53e6\u5916\uff0c\u8fd9\u6b3e\u6536\u96c6\u5668\u8fd8\u6709\u4e00\u4e2a\u4f18\u70b9\u662f\u53ea\u8981\u8bbe\u7f6e\u597d\u57fa\u672c\u7684\u53c2\u6570\u5982\u5806\u5927\u5c0f\uff0c\u6700\u5927\u505c\u987f\u65f6\u95f4\uff0c\u541e\u5410\u91cf\uff0c\u5176\u5b83\u5177\u4f53\u7ec6\u8282\u53c2\u6570\u7684\u8c03\u8282\u53ef\u4ee5\u7531\u5b83\u672c\u8eab\u5b8c\u6210\uff0c\u8fd9\u662f Parallel Scavenge \u7684\u81ea\u9002\u5e94\u8c03\u8282\u7b56\u7565\u3002<\/p>\n\n\n\n
Serial Old \u6536\u96c6\u5668<\/h4>\n\n\n\n
Serial Old \u6536\u96c6\u5668\uff08\u6807\u8bb0-\u6e05\u9664\uff09\uff0c\u770b\u540d\u5b57\u5c31\u80fd\u77e5\u9053\u8fd9\u662f Serial \u7684\u8001\u5e74\u4ee3\u7248\u672c\uff0c\u540c\u6837\u4e5f\u662f\u5355\u7ebf\u7a0b\u5de5\u4f5c\u3002<\/p>\n\n\n\n
Parallel Old \u6536\u96c6\u5668<\/h4>\n\n\n\n
Parallel Old \u6536\u96c6\u5668\uff08\u6807\u8bb0-\u6574\u7406\uff09\uff0c\u901a\u8fc7\u4e0e Parallel Scavenge \u6536\u96c6\u5668\u642d\u914d\u5de5\u4f5c\u5f62\u6210\u201c\u541e\u5410\u91cf\u4f18\u5148\u201d\u7684\u6536\u96c6\u5668\u7ec4\u5408\u3002\u5728\u4e00\u4e9b\u6ce8\u91cd\u541e\u5410\u91cf\u6216\u8005\u5904\u7406\u5668\u8d44\u6e90\u7a00\u7f3a\u7684\u573a\u5408\uff0c\u53ef\u4ee5\u4f18\u5148\u8003\u8651\u6b64\u7ec4\u5408\u3002<\/p>\n\n\n\n
CMS \u6536\u96c6\u5668<\/h4>\n\n\n\n
CMS \u6536\u96c6\u5668\uff08\u6807\u8bb0-\u6e05\u9664\uff09\u5168\u79f0\u4e3a Concurrent Mark Sweep \uff0c\u6b64\u5904\u7406\u5668\u4ee5\u83b7\u53d6\u6700\u77ed\u56de\u6536\u505c\u987f\u65f6\u95f4\u4e3a\u76ee\u6807\u3002\u5bf9\u4e8e\u90e8\u7f72\u670d\u52a1\u5668\u4e0a\u4ee5\u7f51\u7ad9\u5f62\u5f0f\u63d0\u4f9b\u670d\u52a1\u7684\u7cfb\u7edf\uff0c\u53ef\u4ee5\u91c7\u7528\u6b64\u6536\u96c6\u5668\u4ece\u800c\u7ed9\u7528\u6237\u5e26\u6765\u826f\u597d\u7684\u4ea4\u4e92\u4f53\u9a8c\u3002<\/p>\n\n\n\n
CMS \u7684 GC \u5206\u4e3a\u56db\u4e2a\u6b65\u9aa4\uff1a1.\u521d\u59cb\u6807\u8bb0\uff1b2.\u5e76\u53d1\u6807\u8bb0\uff1b3.\u91cd\u65b0\u6807\u8bb0\uff1b4.\u5e76\u53d1\u6e05\u9664\u3002\u5728\u521d\u59cb\u6807\u8bb0\u548c\u91cd\u65b0\u6807\u8bb0\u9636\u6bb5\u4f1a\u201cStop The Word\u201d\uff0c\u4e0d\u8fc7\u8fd9\u4e24\u9636\u6bb5\u8017\u65f6\u90fd\u5f88\u5c0f\u3002\u867d\u7136\u5b83\u5177\u6709\u5e76\u53d1\u6536\u96c6\u3001\u4f4e\u505c\u987f\u7684\u4f18\u70b9\uff0c\u4f46\u540c\u65f6\u5bf9\u4e8e\u5904\u7406\u5668\u8d44\u6e90\u5341\u5206\u654f\u611f\u3002\u53e6\u5916\uff0c\u5728\u8fdb\u884c\u5e76\u53d1\u6807\u8bb0\u548c\u5e76\u53d1\u6e05\u9664\u65f6\uff0c\u7531\u4e8e\u540c\u65f6\u7528\u6237\u7ebf\u7a0b\u4e5f\u5728\u6267\u884c\u6240\u4ee5\u8fd8\u4f1a\u4ea7\u751f\u65b0\u7684\u5f85\u56de\u6536\u5bf9\u8c61\uff0c\u8fd9\u79cd\u5bf9\u8c61\u79f0\u4e4b\u4e3a\u201c\u6d6e\u52a8\u5783\u573e\u201d\u3002\u56e0\u4e3a\u91c7\u7528\u4e86\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\uff0c\u540c\u6837\u4e5f\u9762\u4e34\u7740\u5185\u5b58\u788e\u7247\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n
Garbage First \u6536\u96c6\u5668<\/h4>\n\n\n\n
Garbage First \u6536\u96c6\u5668\uff08\u6807\u8bb0-\u6574\u7406\u3001\u6807\u8bb0-\u590d\u5236\uff09\u4e5f\u88ab\u79f0\u4e3a G1 \u6536\u96c6\u5668\uff0c\u5176\u5b9e\u8fd9\u662f\u4e00\u6b3e\u4e0e\u524d\u9762\u6240\u6709\u6536\u96c6\u5668\u5212\u5206\u5185\u5b58\u533a\u57df\u7684\u51fa\u53d1\u70b9\u90fd\u4e0d\u540c\u7684\u6536\u96c6\u5668\uff0c\u5b83\u5f00\u521b\u4e86\u6536\u96c6\u5668\u9762\u5411\u5c40\u90e8\u7684\u8bbe\u8ba1\u601d\u8def\u548c\u57fa\u4e8e Region \u7684\u5185\u5b58\u5e03\u5c40\u5f62\u5f0f\u3002\u4f5c\u4e3a\u4e00\u6b3e\u4e3b\u8981\u9762\u5411\u670d\u52a1\u7aef\u5e94\u7528\u7684\u5783\u573e\u6536\u96c6\u5668\uff0c\u5f00\u53d1\u56e2\u961f\u5bf9\u4e8e\u5b83\u7684\u671f\u671b\u5c31\u662f\u66ff\u4ee3 CMS \u3002<\/p>\n\n\n\n
G1 \u4ecd\u662f\u9075\u5faa\u5206\u4ee3\u6536\u96c6\u7406\u8bba\u8bbe\u8ba1\uff0c\u4f46\u662f\u6ca1\u6709\u76f4\u63a5\u628a Java \u5806\u5206\u6210\u65b0\u751f\u4ee3\u4e0e\u8001\u5e74\u4ee3\u8fd9\u79cd\u5e03\u5c40\u3002\u800c\u662f\u628a\u8fde\u7eed\u7684 Java \u5806\u5212\u5206\u4e3a\u591a\u4e2a\u5927\u5c0f\u76f8\u7b49\u7684\u72ec\u7acb\u533a\u57df\uff08Region\uff09\uff0c\u6bcf\u4e2a\u533a\u57df\u90fd\u53ef\u4ee5\u6839\u636e\u9700\u8981\u626e\u6f14\u65b0\u751f\u4ee3\u7684 Eden\u3001Survivor\u7a7a\u95f4\uff0c\u6216\u8005\u8001\u5e74\u4ee3\u7a7a\u95f4\u3002G1 \u5bf9\u626e\u6f14\u4e0d\u540c\u89d2\u8272\u7684 Region \u91c7\u7528\u4e0d\u540c\u7684\u7b56\u7565\u8fdb\u884c\u5904\u7406\u3002\u4e0d\u8fc7\uff0c\u5728 JVM \u4e2d\u603b\u4f1a\u6709\u4e00\u4e9b\u5927\u5bf9\u8c61\u5b58\u5728\uff0c\u6240\u4ee5\u8fd8\u6709\u4e00\u7c7b\u7279\u6b8a\u7684 Region\u2014\u2014Humongous \u533a\u57df\uff0c\u7528\u6765\u5b58\u50a8\u5927\u5bf9\u8c61\u3002\u5bf9\u4e8e\u5927\u5bf9\u8c61\u7684\u5b9a\u4e49\u662f\u5927\u5c0f\u8d85\u8fc7\u4e86\u4e00\u4e2a Region \u5bb9\u91cf\u4e00\u534a\u7684\u5bf9\u8c61\u3002G1 \u901a\u8fc7\u628a\u7ba1\u7406\u7684 Java \u5806\u7684\u7c92\u5ea6\u7ec6\u5316\u5230 Region \u5927\u5c0f\uff0c\u8fd9\u6837\u6bcf\u6b21\u6536\u96c6\u5230\u7684\u5185\u5b58\u7a7a\u95f4\u90fd\u662f Region \u5927\u5c0f\u7684\u6574\u6570\u500d\u3002\u901a\u8fc7\u7ec6\u5316\u540e\uff0c\u518d\u914d\u5408\u76f8\u5e94\u7684\u6570\u636e\u7ed3\u6784\u5c31\u80fd\u6709\u8ba1\u5212\u7684\u63a7\u5236\u505c\u987f\u65f6\u95f4\u6765\u8fdb\u884c\u6536\u96c6\u3002<\/p>\n\n\n\n
G1 \u7684GC\u5206\u4e3a\u4ee5\u4e0b\u56db\u4e2a\u6b65\u9aa4\uff1a1.\u521d\u59cb\u6807\u8bb0\uff1b2.\u5e76\u53d1\u6807\u8bb0\uff1b3.\u6700\u7ec8\u6807\u8bb0\uff1b4.\u7b5b\u9009\u56de\u6536\u3002\u5982\u679c\u673a\u5668\u6709\u8f83\u5927\u7684\u5185\u5b58\u7a7a\u95f4\u53ef\u4ee5\u4f7f\u7528\uff0c\u8fd8\u662f\u63a8\u8350\u4f7f\u7528 G1 \u8fdb\u884c GC\u7684\u3002<\/p>\n\n\n\n
\u5176\u5b83\u6536\u96c6\u5668<\/h3>\n\n\n\n
\u6709\u4e00\u4e9b\u4f4e\u5ef6\u8fdf\u6536\u96c6\u5668\u5305\u62ec Shenandoah \u6536\u96c6\u5668\u3001ZGC \u6536\u96c6\u5668\u3002<\/p>\n\n\n\n
\u603b\u7ed3<\/h2>\n\n\n\n
\u672c\u6587\u4e3b\u8981\u662f\u8bb2\u4e86\u5173\u4e8e JVM \u4e2d GC \u76f8\u5173\u7684\u77e5\u8bc6\uff0c\u9650\u4e8e\u7bc7\u5e45\u6709\u4e9b\u5730\u65b9\u5e76\u6ca1\u6709\u8fdb\u884c\u8be6\u7ec6\u4ecb\u7ecd\u3002\u6240\u4ee5\uff0c\u5982\u679c\u8981\u8ba4\u771f\u5b66\u4e60\u76f8\u5173\u77e5\u8bc6\u8fd8\u662f\u9700\u8981\u9605\u8bfb\u4e13\u95e8\u7684\u4e66\u7c4d\u3002\u53e6\u5916\uff0c\u5728\u9644\u5f55\u4e2d\u53c8\u8865\u5145\u4e86\u4e00\u4e9b\u4e0d\u592a\u9002\u5408\u653e\u5165\u4e0a\u6587\u7684\u77e5\u8bc6\u70b9\u3002<\/p>\n\n\n\n
\u9644\u5f55<\/h2>\n\n\n\n
\u5173\u4e8e\u5f15\u7528<\/h3>\n\n\n\n
\u5728\u6b63\u6587\u4e2d\uff0c\u7531\u4e8e\u6587\u7ae0\u7ed3\u6784\u539f\u56e0\u5e76\u672a\u5bf9\u5f15\u7528\u505a\u8fc7\u591a\u4ecb\u7ecd\u3002\u6240\u4ee5\uff0c\u5728\u9644\u5f55\u91cc\u8fdb\u884c\u4e86\u8865\u5145\u8bf4\u660e\u3002\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u5728\u6b63\u6587\u4e2d\u51fa\u73b0\u4e86\u8bb8\u591a\u6b21\u201c\u5f15\u7528\u201d\u8fd9\u4e2a\u8bcd\u8bed\u3002\u5176\u5b9e\u5728 JVM \u4e2d\uff0c\u4e3a\u4e86\u4fbf\u4e8e\u7ba1\u7406\u548c\u8fdb\u884c\u533a\u522b\u628a\u5f15\u7528\u5206\u4e3a\u4e86\u56db\u7c7b\uff0c\u6309\u7167\u5f15\u7528\u5f3a\u5ea6\u7531\u5f3a\u5230\u5f31\u7684\u987a\u5e8f\u6392\u5217\u5206\u522b\u662f\u5f3a\u5f15\u7528 \u3001\u8f6f\u5f15\u7528\u3001\u5f31\u5f15\u7528\u3001\u865a\u5f15\u7528\u3002<\/p>\n\n\n\n
\u4ec0\u4e48\u662f\u5f3a\u5f15\u7528\uff1f\u4e3e\u4e2a\u5217\u5b50\uff0cObject obj = new Object()<\/code>\uff1b\u8fd9\u5c31\u5c5e\u4e8e\u5f3a\u5f15\u7528\u3002\u53ea\u8981\u5f15\u7528\u5173\u7cfb\u8fd8\u5b58\u5728\uff0c\u5783\u573e\u6536\u96c6\u5668\u5c31\u4e0d\u53ef\u80fd\u56de\u6536\u88ab\u5f15\u7528\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n
\u8f6f\u5f15\u7528\u5219\u662f\u7528\u6765\u63cf\u8ff0\u4e00\u4e9b\u975e\u5fc5\u987b\u7684\u5bf9\u8c61\uff0c\u53ea\u6709\u5f53\u7cfb\u7edf\u5728\u53d1\u751f\u5185\u5b58\u6ea2\u51fa\u4e4b\u524d\u5783\u573e\u6536\u96c6\u5668\u624d\u4f1a\u5c06\u8f6f\u5f15\u7528\u5173\u8054\u7684\u5bf9\u8c61\u56de\u6536\u6389\u3002<\/p>\n\n\n\n
\u5f31\u5f15\u7528\u7684\u5f3a\u5ea6\u66f4\u4f4e\uff0c\u4e00\u65e6\u53d1\u751fGC \u88ab\u5173\u8054\u7684\u5bf9\u8c61\u5c31\u4f1a\u88ab\u56de\u6536\u6389\u3002<\/p>\n\n\n\n
\u865a\u5f15\u7528\u662f\u6700\u5f31\u7684\u4e00\u79cd\u5f15\u7528\u5173\u7cfb\uff0c\u5b83\u5bf9\u4e8e\u5bf9\u8c61\u7684\u5b58\u6d3b\u5b8c\u5168\u6ca1\u6709\u5f71\u54cd\uff0c\u5b83\u5b58\u5728\u7684\u610f\u4e49\u662f\u4e3a\u80fd\u5728\u8fd9\u4e2a\u5bf9\u8c61\u88ab\u6536\u96c6\u5668\u56de\u6536\u662f\u6536\u5230\u4e00\u4e2a\u7cfb\u7edf\u901a\u77e5\u3002<\/p>\n\n\n\n
\u56de\u6536\u5bf9\u8c61<\/h3>\n\n\n\n
\u5f53\u5bf9\u8c61\u88ab\u7b2c\u4e00\u6b21\u6807\u8bb0\u540e\uff0c\u5176\u5b9e\u4e5f\u4e0d\u4e00\u5b9a\u5c31\u8981\u56de\u6536\u6389\uff0c\u8fd8\u662f\u6709\u201c\u8d77\u6b7b\u56de\u751f\u201d\u7684\u673a\u4f1a\u7684\u3002\u7b2c\u4e00\u6b21\u88ab\u6807\u8bb0\u540e\uff0c\u968f\u540e\u8fd8\u4f1a\u518d\u8fdb\u884c\u4e00\u6b21\u7b5b\u9009\uff0c\u7b5b\u9009\u7684\u6761\u4ef6\u5c31\u662f\u6b64\u5bf9\u8c61\u662f\u5426\u6709\u5fc5\u8981\u6267\u884c finalize() <\/code>\u65b9\u6cd5\u3002\u5982\u679c\u9700\u8981\u6267\u884c\uff0c\u90a3\u4e48\u5728\u6267\u884c finalize() <\/code>\u65f6\u91cd\u65b0\u4e0e GC Roots \u96c6\u5408\u4e2d\u7684\u5bf9\u8c61\u5efa\u7acb\u5173\u8054\u5173\u7cfb\u5373\u80fd\u5728\u7b2c\u4e8c\u6b21\u5c0f\u89c4\u6a21\u6807\u8bb0\u65f6\u907f\u514d\u88ab\u56de\u6536\u3002\u5f53\u7136\uff0c\u5982\u679c\u5bf9\u8c61\u6ca1\u6709\u8986\u76d6 finalize() <\/code>\u65b9\u6cd5\uff0c\u6216\u8005\u5df2\u7ecf\u88ab\u8c03\u7528\u8fc7 finalize()<\/code> \u65b9\u6cd5\u90a3\u4e48\u5b83\u5c31\u4e0d\u53ef\u80fd\u201c\u8d77\u6b7b\u56de\u751f\u201d\u4e86\u3002 <\/p>\n\n\n\n
\u53c2\u8003\u8d44\u6599<\/h2>\n\n\n\n
[1] \u300a\u6df1\u5165\u7406\u89e3 Java \u865a\u62df\u673a\u300b<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"
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