{"id":97,"date":"2021-01-01T14:36:52","date_gmt":"2021-01-01T06:36:52","guid":{"rendered":"http:\/\/123.57.57.233\/?p=97"},"modified":"2021-03-03T16:20:04","modified_gmt":"2021-03-03T08:20:04","slug":"java%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"http:\/\/17enter.com\/?p=97","title":{"rendered":"Java\u5783\u573e\u56de\u6536\u673a\u5236"},"content":{"rendered":"\n<h2>\u5783\u573e\u56de\u6536\u7684\u610f\u4e49<\/h2>\n\n\n\n<p>Java\u8bed\u8a00\u4e2d\u4e00\u4e2a\u663e\u8457\u7684\u7279\u70b9\u5c31\u662f\u5f15\u5165\u4e86\u5783\u573e\u56de\u6536\u673a\u5236\uff0c\u4f7fc++\u7a0b\u5e8f\u5458\u6700\u5934\u75bc\u7684\u5185\u5b58\u7ba1\u7406\u7684\u95ee\u9898\u8fce\u5203\u800c\u89e3\uff0c\u5b83\u4f7f\u5f97Java\u7a0b\u5e8f\u5458\u5728\u7f16\u5199\u7a0b\u5e8f\u7684\u65f6\u5019\u4e0d\u518d\u9700\u8981\u8003\u8651\u5185\u5b58\u7ba1\u7406\u3002<\/p>\n\n\n\n<p>\u7531\u4e8e\u6709\u4e86\u5783\u573e\u56de\u6536\u673a\u5236\uff0cJava\u4e2d\u7684\u5bf9\u8c61\u4e0d\u518d\u6709\u201c\u4f5c\u7528\u57df\u201d\u7684\u6982\u5ff5\uff0c\u53ea\u6709\u5bf9\u8c61\u7684\u5f15\u7528\u624d\u6709\u201c\u4f5c\u7528\u57df\u201d\u3002\u5783\u573e\u56de\u6536\u53ef\u4ee5\u6709\u6548\u7684\u9632\u6b62\u5185\u5b58\u6cc4\u9732\uff0c\u6709\u6548\u7684\u4f7f\u7528\u7a7a\u95f2\u7684\u5185\u5b58\u3002<\/p>\n\n\n\n<h2>\u5783\u573e\u56de\u6536\u7b97\u6cd5<\/h2>\n\n\n\n<p>\u5783\u573e\u56de\u6536\u7b97\u6cd5\u9700\u8981\u505a\u7684\u57fa\u672c\u4e8b\u60c5\uff1a<\/p>\n\n\n\n<ul><li>\u53d1\u73b0\u65e0\u7528\u5bf9\u8c61\uff08<span class=\"has-inline-color has-vivid-red-color\"><em>\u6807\u8bb0\u7b97\u6cd5<\/em><\/span>\uff09<\/li><li>\u56de\u6536\u88ab\u65e0\u7528\u5bf9\u8c61\u5360\u7528\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u4f7f\u8be5\u7a7a\u95f4\u53ef\u88ab\u7a0b\u5e8f\u518d\u6b21\u4f7f\u7528\uff08<span class=\"has-inline-color has-vivid-red-color\"><em>\u56de\u6536\u7b97\u6cd5<\/em><\/span>\uff09<\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter is-resized\"><figure class=\"mdx-lazyload-container\" style=\"max-width:1408px\"><div style=\"padding-top:26.136363636364%\"><\/div><div class=\"mdx-img-loading-sp mdui-valign\"><div><div class=\"mdui-spinner\"><\/div><\/div><\/div><img width=\"1408\" height=\"368\" class=\"lazyload\" title=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2019072720171174.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3R6dzE5OTI=,size_16,color_FFFFFF,t_70\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/figure><\/figure><\/div>\n\n\n\n<h3>1.\u6807\u8bb0\u7b97\u6cd5<\/h3>\n\n\n\n<h4>1.1 \u5f15\u7528\u8ba1\u6570\u6cd5\uff08<code><span class=\"has-inline-color has-vivid-red-color\"><em>Reference Counting Collector<\/em><\/span><\/code>\uff09<\/h4>\n\n\n\n<p>\u5f15\u7528\u8ba1\u6570\u662f\u5783\u573e\u6536\u96c6\u5668\u4e2d\u7684\u65e9\u671f\u7b56\u7565\u3002<br>\u6b64\u65b9\u6cd5\u4e2d\uff0c\u5806\u4e2d\u7684\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u4f1a\u6dfb\u52a0\u4e00\u4e2a\u5f15\u7528\u8ba1\u6570\u5668\u3002\u6bcf\u5f53\u4e00\u4e2a\u5730\u65b9\u5f15\u7528\u8fd9\u4e2a\u5bf9\u8c61\u65f6\uff0c\u8ba1\u6570\u5668\u503c <code>+1<\/code>\uff1b\u5f53\u5f15\u7528\u5931\u6548\u65f6\uff0c\u8ba1\u6570\u5668\u503c <code>-1<\/code>\u3002\u4efb\u4f55\u65f6\u523b\u8ba1\u6570\u503c\u4e3a <code>0<\/code> \u7684\u5bf9\u8c61\u5c31\u662f\u4e0d\u53ef\u80fd\u518d\u88ab\u4f7f\u7528\u7684\u3002<\/p>\n\n\n\n<p><strong>\u4f18\u70b9\uff1a<\/strong>&nbsp;\u5b9e\u73b0\u7b80\u5355\uff0c\u5224\u5b9a\u6548\u7387\u9ad8\u3002<br><strong>\u7f3a\u70b9\uff1a<\/strong>&nbsp;\u5f88\u96be\u89e3\u51b3\u5bf9\u8c61\u5faa\u73af\u5f15\u7528\u95ee\u9898\u3002<\/p>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\" style=\"flex-basis:100%\">\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\" style=\"flex-basis:100%\">\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\" style=\"flex-basis:100%\">\n<pre class=\"wp-block-code\"><code>public class Main {\n    public static void main(String&#91;] args) {\n        MyObject object1 = new MyObject();\n        MyObject object2 = new MyObject();\n\n        object1.object = object2;\n        object2.object = object1;\n\n        object1 = null;\n        object2 = null;\n    }\n}<\/code><\/pre>\n\n\n\n<p><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<p>\u6700\u540e\u9762\u4e24\u53e5\u5c06 <code><em><span class=\"has-inline-color has-vivid-red-color\">object1<\/span><\/em><\/code> \u548c <code><em><span class=\"has-inline-color has-vivid-red-color\">object2<\/span><\/em><\/code> \u8d4b\u503c\u4e3a <code><span class=\"has-inline-color has-vivid-red-color\"><em>null<\/em><\/span><\/code>\uff0c\u4e5f\u5c31\u662f\u8bf4 <code><span class=\"has-inline-color has-vivid-red-color\"><em>object1<\/em><\/span><\/code> \u548c <code><span class=\"has-inline-color has-vivid-red-color\"><em>object2<\/em><\/span><\/code> \u6307\u5411\u7684\u5bf9\u8c61\u5df2\u7ecf\u4e0d\u53ef\u80fd\u518d\u88ab\u8bbf\u95ee\uff0c\u4f46\u662f\u7531\u4e8e\u5b83\u4eec\u4e92\u76f8\u5f15\u7528\u5bf9\u65b9\uff0c\u5bfc\u81f4\u5b83\u4eec\u7684\u5f15\u7528\u8ba1\u6570\u5668\u90fd\u4e0d\u4e3a <code><span class=\"has-inline-color has-vivid-red-color\"><em>0<\/em><\/span><\/code>\uff0c\u90a3\u4e48\u5783\u573e\u6536\u96c6\u5668\u5c31\u6c38\u8fdc\u4e0d\u4f1a\u56de\u6536\u5b83\u4eec\u3002<\/p>\n<\/div>\n<\/div>\n\n\n\n<h4>1.2  <strong>\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5\uff08\u6839\u641c\u7d22\u7b97\u6cd5\uff09<\/strong><\/h4>\n\n\n\n<p>\u8be5\u7b97\u6cd5\u662f\u4ece\u79bb\u6563\u6570\u5b66\u4e2d\u7684\u56fe\u8bba\u5f15\u5165\u7684\uff0c\u7a0b\u5e8f\u5c06\u6240\u6709\u5f15\u7528\u5173\u7cfb\u770b\u6210\u662f\u4e00\u5f20\u56fe\uff0c\u901a\u8fc7\u4e00\u7cfb\u5217\u79f0\u4e3a\u201cGC Roots\u201d\u7684\u5bf9\u8c61\u4f5c\u4e3a\u8d77\u59cb\u70b9\uff0c\u4ece\u8fd9\u4e9b\u8282\u70b9\u5f00\u59cb\u5411\u4e0b\u641c\u7d22\uff0c\u641c\u7d22\u8d70\u8fc7\u7684\u8def\u5f84\u79f0\u4e3a\u5f15\u7528\u94fe\uff08Reference Chain\uff09\uff0c\u5f53\u4e00\u4e2a\u5bf9\u8c61\u5230GC Roots\u6ca1\u6709\u4efb\u4f55\u5f15\u7528\u94fe\u76f8\u8fde\uff08\u7528\u56fe\u8bba\u7684\u8bdd\u6765\u8bb2\uff0c\u5c31\u662f\u4eceGC Roots\u5230\u8fd9\u4e2a\u5bf9\u8c61\u4e0d\u53ef\u8fbe\uff09\u65f6\uff0c\u5219\u8bf4\u660e\u8be5\u5bf9\u8c61\u662f\u4e0d\u53ef\u7528\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><figure class=\"mdx-lazyload-container\" style=\"max-width:903px\"><div style=\"padding-top:72.314507198228%\"><\/div><div class=\"mdx-img-loading-sp mdui-valign\"><div><div class=\"mdui-spinner\"><\/div><\/div><\/div><img width=\"903\" height=\"653\" class=\"lazyload\" title=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2019072721092656.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3R6dzE5OTI=,size_16,color_FFFFFF,t_70\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/figure><\/figure>\n\n\n\n<p><strong>Java\u4e2d\u53ef\u4ee5\u4f5c\u4e3aGC Roots\u7684\u5bf9\u8c61<\/strong><\/p>\n\n\n\n<ul><li>\u865a\u62df\u673a\u6808\uff08\u6808\u5e27\u4e2d\u7684\u672c\u5730\u53d8\u91cf\u8868\uff09\u4e2d\u5f15\u7528\u7684\u5bf9\u8c61\u3002<\/li><li>\u65b9\u6cd5\u533a\u4e2d\u7c7b\u9759\u6001\u5c5e\u6027\u5f15\u7528\u7684\u5bf9\u8c61\u3002<\/li><li>\u65b9\u6cd5\u533a\u4e2d\u5e38\u91cf\u5f15\u7528\u7684\u5bf9\u8c61\u3002<\/li><li>\u672c\u5730\u65b9\u6cd5\u6808\u4e2dJNI\uff08Native\u65b9\u6cd5\uff09\u5f15\u7528\u7684\u5bf9\u8c61\u3002<\/li><\/ul>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/blog.csdn.net\/justloveyou_\/article\/details\/71189093\" target=\"_blank\"><span class=\"has-inline-color has-luminous-vivid-orange-color\">\u53ef\u53c2\u8003\uff1a\u300aJVM \u5185\u5b58\u6a21\u578b\u6982\u8ff0\u300b<\/span><\/a><\/p>\n\n\n\n<h3>2.\u56de\u6536\u7b97\u6cd5<\/h3>\n\n\n\n<h4>2.1 \u6807\u8bb0-\u6e05\u9664\uff08<code><em><span class=\"has-inline-color has-vivid-red-color\">Mark-Sweep<\/span><\/em><\/code>\uff09\u7b97\u6cd5<\/h4>\n\n\n\n<p>\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\uff1a<\/p>\n\n\n\n<ul><li>\u6807\u8bb0\u9636\u6bb5\uff1a\u6807\u8bb0\u51fa\u9700\u8981\u88ab\u56de\u6536\u7684\u5bf9\u8c61\u3002<\/li><li>\u6e05\u9664\u9636\u6bb5\uff1a\u56de\u6536\u88ab\u6807\u8bb0\u7684\u53ef\u56de\u6536\u5bf9\u8c61\u7684\u5185\u90e8\u7a7a\u95f4\u3002<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><figure class=\"mdx-lazyload-container\" style=\"max-width:682px\"><div style=\"padding-top:66.129032258065%\"><\/div><div class=\"mdx-img-loading-sp mdui-valign\"><div><div class=\"mdui-spinner\"><\/div><\/div><\/div><img width=\"682\" height=\"451\" class=\"wp-image-112 lazyload\" title=\"Java\u5783\u573e\u56de\u6536\u673a\u5236\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"http:\/\/123.57.57.233\/wp-content\/uploads\/2021\/02\/image.png\" alt=\"http:\/\/123.57.57.233\/wp-content\/uploads\/2021\/02\/image.png\" data-srcset=\"http:\/\/17enter.com\/wp-content\/uploads\/2021\/02\/image.png 682w, http:\/\/17enter.com\/wp-content\/uploads\/2021\/02\/image-300x198.png 300w\" sizes=\"(max-width: 682px) 100vw, 682px\"><\/figure><\/figure>\n\n\n\n<p>\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u5b9e\u73b0\u8f83\u5bb9\u6613\uff0c\u4e0d\u9700\u8981\u79fb\u52a8\u5bf9\u8c61\uff0c\u4f46\u662f\u5b58\u5728\u8f83\u4e25\u91cd\u7684\u95ee\u9898\uff1a<\/p>\n\n\n\n<ul><li>\u7b97\u6cd5\u8fc7\u7a0b\u9700\u8981\u6682\u505c\u6574\u4e2a\u5e94\u7528\uff0c\u6548\u7387\u4e0d\u9ad8\u3002<\/li><li>\u6807\u8bb0\u6e05\u9664\u540e\u4f1a\u4ea7\u751f\u5927\u91cf\u4e0d\u8fde\u7eed\u7684\u5185\u5b58\u788e\u7247\uff0c\u788e\u7247\u592a\u591a\u53ef\u80fd\u4f1a\u5bfc\u81f4\u540e\u7eed\u8fc7\u7a0b\u4e2d\u9700\u8981\u4e3a\u5927\u5bf9\u8c61\u5206\u914d\u7a7a\u95f4\u65f6\u65e0\u6cd5\u627e\u5230\u8db3\u591f\u7684\u7a7a\u95f4\u800c\u63d0\u524d\u89e6\u53d1\u65b0\u7684\u4e00\u6b21\u5783\u573e\u6536\u96c6\u52a8\u4f5c\u3002<\/li><\/ul>\n\n\n\n<h4>2.2 \u590d\u5236\uff08<code><em><span class=\"has-inline-color has-vivid-red-color\">Copying<\/span><\/em><\/code>\uff09\u7b97\u6cd5<\/h4>\n\n\n\n<p>\u4e3a\u4e86\u89e3\u51b3\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u7684\u7f3a\u9677\uff0c\u7531\u6b64\u6709\u4e86\u590d\u5236\u7b97\u6cd5\u3002<br>\u590d\u5236\u7b97\u6cd5\u5c06\u53ef\u7528\u5185\u5b58\u5206\u4e3a\u4e24\u5757\uff0c\u6bcf\u6b21\u53ea\u7528\u5176\u4e2d\u4e00\u5757\uff0c\u5f53\u8fd9\u4e00\u5757\u5185\u5b58\u7528\u5b8c\u4e86\uff0c\u5c31\u5c06\u8fd8\u5b58\u6d3b\u7740\u7684\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u5916\u4e00\u5757\u4e0a\u9762\uff0c\u7136\u540e\u518d\u628a\u5df2\u7ecf\u4f7f\u7528\u8fc7\u7684\u5185\u5b58\u7a7a\u95f4\u4e00\u6b21\u6027\u6e05\u7406\u6389\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><figure class=\"mdx-lazyload-container\" style=\"max-width:749px\"><div style=\"padding-top:58.744993324433%\"><\/div><div class=\"mdx-img-loading-sp mdui-valign\"><div><div class=\"mdui-spinner\"><\/div><\/div><\/div><img width=\"749\" height=\"440\" class=\"wp-image-113 lazyload\" title=\"Java\u5783\u573e\u56de\u6536\u673a\u5236\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"http:\/\/123.57.57.233\/wp-content\/uploads\/2021\/02\/image-1.png\" alt=\"http:\/\/123.57.57.233\/wp-content\/uploads\/2021\/02\/image-1.png\" data-srcset=\"http:\/\/17enter.com\/wp-content\/uploads\/2021\/02\/image-1.png 749w, http:\/\/17enter.com\/wp-content\/uploads\/2021\/02\/image-1-300x176.png 300w\" sizes=\"(max-width: 749px) 100vw, 749px\"><\/figure><\/figure>\n\n\n\n<p>\u5c0f\u7ed3\uff1a<\/p>\n\n\n\n<ul><li>\u4f18\u70b9\uff1a\u5b9e\u73b0\u7b80\u5355\uff0c\u4e0d\u6613\u4ea7\u751f\u5185\u5b58\u788e\u7247\uff0c\u6bcf\u6b21\u53ea\u9700\u8981\u5bf9\u534a\u4e2a\u533a\u8fdb\u884c\u5185\u5b58\u56de\u6536\u3002<\/li><li>\u7f3a\u70b9\uff1a\u5185\u5b58\u7a7a\u95f4\u7f29\u51cf\u4e3a\u539f\u6765\u7684\u4e00\u534a\uff1b\u7b97\u6cd5\u7684\u6548\u7387\u548c\u5b58\u6d3b\u5bf9\u8c61\u7684\u6570\u76ee\u6709\u5173\uff0c\u5b58\u6d3b\u5bf9\u8c61\u8d8a\u591a\uff0c\u6548\u7387\u8d8a\u4f4e\u3002<\/li><\/ul>\n\n\n\n<h4>2.3 \u6807\u8bb0-\u6574\u7406\uff08<code><em><span class=\"has-inline-color has-vivid-red-color\">Mark-Compact<\/span><\/em><\/code>\uff09\u7b97\u6cd5<\/h4>\n\n\n\n<p>\u4e3a\u4e86\u66f4\u5145\u5206\u5229\u7528\u5185\u5b58\u7a7a\u95f4\uff0c\u63d0\u51fa\u4e86\u6807\u8bb0-\u6574\u7406\u7b97\u6cd5\u3002<br>\u6b64\u7b97\u6cd5\u7ed3\u5408\u4e86\u201c\u6807\u8bb0-\u6e05\u9664\u201d\u548c\u201c\u590d\u5236\u201d\u4e24\u4e2a\u7b97\u6cd5\u7684\u4f18\u70b9\u3002<br>\u8be5\u7b97\u6cd5\u6807\u8bb0\u9636\u6bb5\u548c\u201c\u6807\u8bb0-\u6e05\u9664\u201d\u7b97\u6cd5\u4e00\u6837\uff0c\u4f46\u662f\u5728\u5b8c\u6210\u6807\u8bb0\u4e4b\u540e\uff0c\u5b83\u4e0d\u662f\u76f4\u63a5\u6e05\u7406\u53ef\u56de\u6536\u5bf9\u8c61\uff0c\u800c\u662f\u5c06\u5b58\u6d3b\u5bf9\u8c61\u90fd\u5411\u4e00\u7aef\u79fb\u52a8\uff0c\u7136\u540e\u6e05\u7406\u6389\u8fb9\u754c\u4ee5\u5916\u7684\u5185\u5b58\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><figure class=\"mdx-lazyload-container\" style=\"max-width:679px\"><div style=\"padding-top:65.832106038292%\"><\/div><div class=\"mdx-img-loading-sp mdui-valign\"><div><div class=\"mdui-spinner\"><\/div><\/div><\/div><img width=\"679\" height=\"447\" class=\"wp-image-114 lazyload\" title=\"Java\u5783\u573e\u56de\u6536\u673a\u5236\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"http:\/\/123.57.57.233\/wp-content\/uploads\/2021\/02\/image-2.png\" alt=\"http:\/\/123.57.57.233\/wp-content\/uploads\/2021\/02\/image-2.png\" data-srcset=\"http:\/\/17enter.com\/wp-content\/uploads\/2021\/02\/image-2.png 679w, http:\/\/17enter.com\/wp-content\/uploads\/2021\/02\/image-2-300x197.png 300w\" sizes=\"(max-width: 679px) 100vw, 679px\"><\/figure><\/figure>\n\n\n\n<h4>2.4 \u5206\u4ee3\u6536\u96c6\uff08<code><em><span class=\"has-inline-color has-vivid-red-color\">Generational Collection<\/span><\/em><\/code>\uff09\u7b97\u6cd5<\/h4>\n\n\n\n<p>\u524d\u9762\u5df2\u7ecf\u6709\u4e09\u79cd\u65b9\u6cd5\u6765\u56de\u6536\u5185\u5b58\uff0c\u90a3\u4e48 Java \u91cc\u662f\u5982\u4f55\u9009\u62e9\u5229\u7528\u8fd9\u4e09\u79cd\u56de\u6536\u7b97\u6cd5\u5462\uff1f\u662f\u53ea\u7528\u4e00\u79cd\u8fd8\u662f\u4e09\u79cd\u90fd\u7528\u5462\uff1f<\/p>\n\n\n\n<p>Java \u7684\u5806\u7ed3\u6784<\/p>\n\n\n\n<p>\u5728\u9009\u62e9\u56de\u6536\u7b97\u6cd5\u524d\uff0c\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0b Java \u5806\u7684\u7ed3\u6784\u3002<\/p>\n\n\n\n<p>\u4e00\u5757 Java \u5806\u7a7a\u95f4\u4e00\u822c\u5206\u6210\u4e09\u90e8\u5206\uff0c\u8fd9\u4e09\u90e8\u5206\u7528\u6765\u5b58\u50a8\u4e09\u7c7b\u6570\u636e\uff1a<\/p>\n\n\n\n<ul><li>\u521a\u521a\u521b\u5efa\u7684\u5bf9\u8c61\u3002\u5728\u4ee3\u7801\u8fd0\u884c\u65f6\u4f1a\u6301\u7eed\u4e0d\u65ad\u5730\u521b\u9020\u65b0\u7684\u5bf9\u8c61\uff0c\u8fd9\u4e9b\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\u4f1a\u88ab\u7edf\u4e00\u653e\u5728\u4e00\u8d77\u3002\u56e0\u4e3a\u6709\u5f88\u591a\u5c40\u90e8\u53d8\u91cf\u7b49\u5728\u65b0\u521b\u5efa\u540e\u5f88\u5feb\u4f1a\u53d8\u6210\u4e0d\u53ef\u8fbe\u7684\u5bf9\u8c61\uff0c\u5feb\u901f\u6b7b\u53bb\uff0c\u56e0\u6b64\u8fd9\u5757\u533a\u57df\u7684\u7279\u70b9\u662f\u5b58\u6d3b\u5bf9\u8c61\u5c11\uff0c\u5783\u573e\u591a\u3002\u5f62\u8c61\u70b9\u63cf\u8ff0\u8fd9\u5757\u533a\u57df\u4e3a\uff1a<em><span class=\"has-inline-color has-vivid-red-color\">\u65b0\u751f\u4ee3<\/span><\/em>\uff1b<\/li><li>\u5b58\u6d3b\u4e86\u4e00\u6bb5\u65f6\u95f4\u7684\u5bf9\u8c61\u3002\u8fd9\u4e9b\u5bf9\u8c61\u65e9\u65e9\u5c31\u88ab\u521b\u5efa\u4e86\uff0c\u800c\u4e14\u4e00\u76f4\u6d3b\u4e86\u4e0b\u6765\u3002\u6211\u4eec\u628a\u8fd9\u4e9b\u5b58\u6d3b\u65f6\u95f4\u8f83\u957f\u7684\u5bf9\u8c61\u653e\u5728\u4e00\u8d77\uff0c\u5b83\u4eec\u7684\u7279\u70b9\u662f\u5b58\u6d3b\u5bf9\u8c61\u591a\uff0c\u5783\u573e\u5c11\u3002\u5f62\u8c61\u70b9\u63cf\u8ff0\u8fd9\u5757\u533a\u57df\u4e3a\uff1a<em><span class=\"has-inline-color has-vivid-red-color\">\u8001\u5e74\u4ee3<\/span><\/em>\uff1b<\/li><li>\u6c38\u4e45\u5b58\u5728\u7684\u5bf9\u8c61\u3002\u6bd4\u5982\u4e00\u4e9b\u9759\u6001\u6587\u4ef6\uff0c\u8fd9\u4e9b\u5bf9\u8c61\u7684\u7279\u70b9\u662f\u4e0d\u9700\u8981\u5783\u573e\u56de\u6536\uff0c\u6c38\u8fdc\u5b58\u6d3b\u3002\u5f62\u8c61\u70b9\u63cf\u8ff0\u8fd9\u5757\u533a\u57df\u4e3a\uff1a<em><span class=\"has-inline-color has-vivid-red-color\">\u6301\u4e45\u4ee3<\/span><\/em>\u3002\uff08\u4e0d\u8fc7\u5728 Java 8 \u91cc\u5df2\u7ecf\u628a\u6301\u4e45\u4ee3\u5220\u9664\u4e86\uff0c\u628a\u8fd9\u5757\u5185\u5b58\u7a7a\u95f4\u7ed9\u4e86\u5143\u7a7a\u95f4\uff0c\u540e\u7eed\u6587\u7ae0\u518d\u8bb2\u89e3\u3002\uff09<\/li><\/ul>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u5e38\u89c4\u7684 Java \u5806\u81f3\u5c11\u5305\u62ec\u4e86 \u65b0\u751f\u4ee3 \u548c \u8001\u5e74\u4ee3 \u4e24\u5757\u5185\u5b58\u533a\u57df\uff0c\u800c\u4e14\u8fd9\u4e24\u5757\u533a\u57df\u6709\u5f88\u660e\u663e\u7684\u7279\u5f81\uff1a<\/p>\n\n\n\n<ul><li>\u65b0\u751f\u4ee3\uff1a\u5b58\u6d3b\u5bf9\u8c61\u5c11\u3001\u5783\u573e\u591a<\/li><li>\u8001\u5e74\u4ee3\uff1a\u5b58\u6d3b\u5bf9\u8c61\u591a\u3001\u5783\u573e\u5c11<\/li><\/ul>\n\n\n\n<p>\u7ed3\u5408\u65b0\u751f\u4ee3\uff0f\u8001\u5e74\u4ee3\u7684\u5b58\u6d3b\u5bf9\u8c61\u7279\u70b9\u548c\u4e4b\u524d\u63d0\u8fc7\u7684\u51e0\u79cd\u5783\u573e\u56de\u6536\u7b97\u6cd5\uff0c\u53ef\u4ee5\u5f97\u5230\u5982\u4e0b\u7684\u56de\u6536\u65b9\u6848\uff1a<\/p>\n\n\n\n<p>\u65b0\u751f\u4ee3\uff0d\u590d\u5236\u56de\u6536\u673a\u5236<\/p>\n\n\n\n<p>\u5bf9\u4e8e\u65b0\u751f\u4ee3\u533a\u57df\uff0c\u7531\u4e8e\u6bcf\u6b21 GC \u90fd\u4f1a\u6709\u5927\u91cf\u65b0\u5bf9\u8c61\u6b7b\u53bb\uff0c\u53ea\u6709\u5c11\u91cf\u5b58\u6d3b\u3002\u56e0\u6b64\u91c7\u7528\u590d\u5236\u56de\u6536\u7b97\u6cd5\uff0cGC \u65f6\u628a\u5c11\u91cf\u7684\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u8fc7\u53bb\u5373\u53ef\u3002<\/p>\n\n\n\n<p>\u8001\u5e74\u4ee3\uff0d\u6807\u8bb0\u6574\u7406\u56de\u6536\u673a\u5236<\/p>\n\n\n\n<p>\u6839\u636e\u4e0a\u9762\u6211\u4eec\u77e5\u9053\uff0c\u8001\u5e74\u4ee3\u4e00\u822c\u5b58\u653e\u7684\u662f\u5b58\u6d3b\u65f6\u95f4\u8f83\u4e45\u7684\u5bf9\u8c61\uff0c\u6240\u4ee5\u6bcf\u4e00\u6b21 GC \u65f6\uff0c\u5b58\u6d3b\u5bf9\u8c61\u6bd4\u8f83\u5927\uff0c\u4e5f\u5c31\u662f\u8bf4\u6bcf\u6b21\u53ea\u6709\u5c11\u90e8\u5206\u5bf9\u8c61\u88ab\u56de\u6536\u3002\u56e0\u6b64\uff0c\u8fd9\u91cc\u9009\u62e9\u6807\u8bb0\u6574\u7406\u56de\u6536\u673a\u5236\uff0c\u4ec5\u4ec5\u901a\u8fc7\u5c11\u91cf\u5730\u79fb\u52a8\u5bf9\u8c61\u5c31\u80fd\u6e05\u7406\u5783\u573e\uff0c\u800c\u4e14\u4e0d\u5b58\u5728\u5185\u5b58\u788e\u7247\u5316\u3002<\/p>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\" style=\"flex-basis:100%\">\n<p>\u5de5\u4f5c\u539f\u7406\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><figure class=\"mdx-lazyload-container\" style=\"max-width:675px\"><div style=\"padding-top:54.666666666667%\"><\/div><div class=\"mdx-img-loading-sp mdui-valign\"><div><div class=\"mdui-spinner\"><\/div><\/div><\/div><img width=\"675\" height=\"369\" class=\"wp-image-115 lazyload\" title=\"Java\u5783\u573e\u56de\u6536\u673a\u5236\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"http:\/\/123.57.57.233\/wp-content\/uploads\/2021\/02\/image-3.png\" alt=\"http:\/\/123.57.57.233\/wp-content\/uploads\/2021\/02\/image-3.png\" data-srcset=\"http:\/\/17enter.com\/wp-content\/uploads\/2021\/02\/image-3.png 563w, http:\/\/17enter.com\/wp-content\/uploads\/2021\/02\/image-3-300x164.png 300w\" sizes=\"(max-width: 675px) 100vw, 675px\"><\/figure><\/figure>\n\n\n\n<p><strong>\u5e74\u8f7b\u4ee3\uff08<code>Young Generation<\/code>\uff09<\/strong><\/p>\n\n\n\n<ol><li>\u6240\u6709\u65b0\u751f\u6210\u7684\u5bf9\u8c61\u9996\u5148\u90fd\u662f\u653e\u5728\u5e74\u8f7b\u4ee3\u7684\u3002\u5e74\u8f7b\u4ee3\u7684\u76ee\u6807\u5c31\u662f\u5c3d\u53ef\u80fd\u5feb\u901f\u7684\u6536\u96c6\u6389\u90a3\u4e9b\u751f\u547d\u5468\u671f\u77ed\u7684\u5bf9\u8c61\u3002<\/li><li>\u65b0\u751f\u4ee3\u5185\u5b58\u6309\u71678:1:1\u7684\u6bd4\u4f8b\u5206\u4e3a\u4e00\u4e2a <code>eden<\/code> \u533a\u548c\u4e24\u4e2a <code>survivor(survivor0,survivor1)<\/code> \u533a\u3002\u4e00\u4e2a <code>Eden<\/code> \u533a\uff0c\u4e24\u4e2a <code>Survivor<\/code> \u533a(\u4e00\u822c\u800c\u8a00)\u3002\u5927\u90e8\u5206\u5bf9\u8c61\u5728 <code>Eden<\/code> \u533a\u4e2d\u751f\u6210\u3002\u56de\u6536\u65f6\u5148\u5c06 <code>eden<\/code> \u533a\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230\u4e00\u4e2a <code>survivor0<\/code> \u533a\uff0c\u7136\u540e\u6e05\u7a7a <code>eden<\/code> \u533a\uff0c\u5f53\u8fd9\u4e2a <code>survivor0<\/code> \u533a\u4e5f\u5b58\u653e\u6ee1\u4e86\u65f6\uff0c\u5219\u5c06 <code>eden<\/code> \u533a\u548c <code>survivor0<\/code> \u533a\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u4e00\u4e2a <code>survivor1<\/code> \u533a\uff0c\u7136\u540e\u6e05\u7a7a <code>eden<\/code> \u548c\u8fd9\u4e2a <code>survivor0<\/code> \u533a\uff0c\u6b64\u65f6 <code>survivor0<\/code> \u533a\u662f\u7a7a\u7684\uff0c\u7136\u540e\u5c06 <code>survivor0<\/code> \u533a\u548c <code>survivor1<\/code> \u533a\u4ea4\u6362\uff0c\u5373\u4fdd\u6301 <code>survivor1<\/code> \u533a\u4e3a\u7a7a\uff0c \u5982\u6b64\u5f80\u590d\u3002<\/li><li>\u5f53 <code>survivor1<\/code>\u533a\u4e0d\u8db3\u4ee5\u5b58\u653e <code>eden<\/code> \u548c <code>survivor0<\/code> \u7684\u5b58\u6d3b\u5bf9\u8c61\u65f6\uff0c\u5c31\u5c06\u5b58\u6d3b\u5bf9\u8c61\u76f4\u63a5\u5b58\u653e\u5230\u8001\u5e74\u4ee3\u3002\u82e5\u662f\u8001\u5e74\u4ee3\u4e5f\u6ee1\u4e86\u5c31\u4f1a\u89e6\u53d1\u4e00\u6b21 <code>Full GC<\/code> \uff0c\u4e5f\u5c31\u662f\u65b0\u751f\u4ee3\u3001\u8001\u5e74\u4ee3\u90fd\u8fdb\u884c\u56de\u6536\u3002<br>4.\u65b0\u751f\u4ee3\u53d1\u751f\u7684 <code>GC<\/code> \u4e5f\u53eb\u505a <code>Minor GC<\/code> \uff0c<code>Minor GC<\/code> \u53d1\u751f\u9891\u7387\u6bd4\u8f83\u9ad8(\u4e0d\u4e00\u5b9a\u7b49 <code>Eden<\/code> \u533a\u6ee1\u4e86\u624d\u89e6\u53d1)\u3002<\/li><\/ol>\n\n\n\n<p><strong>\u5e74\u8001\u4ee3\uff08<code>Old Generation<\/code>\uff09<\/strong><\/p>\n\n\n\n<ol><li>\u5728\u5e74\u8f7b\u4ee3\u4e2d\u7ecf\u5386\u4e86 <code>N<\/code> \u6b21\u5783\u573e\u56de\u6536\u540e\u4ecd\u7136\u5b58\u6d3b\u7684\u5bf9\u8c61\uff0c\u5c31\u4f1a\u88ab\u653e\u5230\u5e74\u8001\u4ee3\u4e2d\u3002\u56e0\u6b64\uff0c\u53ef\u4ee5\u8ba4\u4e3a\u5e74\u8001\u4ee3\u4e2d\u5b58\u653e\u7684\u90fd\u662f\u4e00\u4e9b\u751f\u547d\u5468\u671f\u8f83\u957f\u7684\u5bf9\u8c61\u3002<\/li><li>\u5185\u5b58\u6bd4\u65b0\u751f\u4ee3\u4e5f\u5927\u5f88\u591a(\u5927\u6982\u6bd4\u4f8b\u662f1:2)\uff0c\u5f53\u8001\u5e74\u4ee3\u5185\u5b58\u6ee1\u65f6\u89e6\u53d1 <code>Major GC<\/code> \u5373 <code>Full GC<\/code>\uff0c<code>Full GC<\/code> \u53d1\u751f\u9891\u7387\u6bd4\u8f83\u4f4e\uff0c\u8001\u5e74\u4ee3\u5bf9\u8c61\u5b58\u6d3b\u65f6\u95f4\u6bd4\u8f83\u957f\uff0c\u5b58\u6d3b\u7387\u6807\u8bb0\u9ad8\u3002<\/li><\/ol>\n\n\n\n<p><strong>\u6301\u4e45\u4ee3\uff08<code>Permanent Generation<\/code>\uff09<\/strong><\/p>\n\n\n\n<p>\u7528\u4e8e\u5b58\u653e\u9759\u6001\u6587\u4ef6\uff0c\u5982 <code>Java<\/code> \u7c7b\u3001\u65b9\u6cd5\u7b49\u3002\u6301\u4e45\u4ee3\u5bf9\u5783\u573e\u56de\u6536\u6ca1\u6709\u663e\u8457\u5f71\u54cd\uff0c\u4f46\u662f\u6709\u4e9b\u5e94\u7528\u53ef\u80fd\u52a8\u6001\u751f\u6210\u6216\u8005\u8c03\u7528\u4e00\u4e9b <code>class<\/code> \uff0c\u4f8b\u5982 <code>Hibernate<\/code> \u7b49\uff0c\u5728\u8fd9\u79cd\u65f6\u5019\u9700\u8981\u8bbe\u7f6e\u4e00\u4e2a\u6bd4\u8f83\u5927\u7684\u6301\u4e45\u4ee3\u7a7a\u95f4\u6765\u5b58\u653e\u8fd9\u4e9b\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u65b0\u589e\u7684\u7c7b\u3002<\/p>\n\n\n\n<p><strong><code>GC<\/code> \u7c7b\u578b\uff1a<\/strong><\/p>\n\n\n\n<p><strong><code>Minor GC<\/code>(\u65b0\u751f\u4ee3 <code>GC<\/code>):<\/strong><br>\u65b0\u751f\u4ee3 <code>GC<\/code>\uff0c\u6307\u53d1\u751f\u5728\u65b0\u751f\u4ee3\u7684\u5783\u573e\u6536\u96c6\u52a8\u4f5c\uff0c\u56e0\u4e3a <code>Java<\/code> \u5bf9\u8c61\u5927\u591a\u90fd\u5177\u5907\u671d\u751f\u7184\u706d\u7684\u7279\u70b9\uff0c\u6240\u4ee5 <code>Minor GC<\/code> \u5341\u5206\u9891\u7e41\uff0c\u56de\u6536\u901f\u5ea6\u4e5f\u8f83\u5feb\u3002<\/p>\n\n\n\n<p><strong><code>Major GC<\/code>(\u8001\u5e74\u4ee3 <code>GC<\/code>):<\/strong><br>\u8001\u5e74\u4ee3 <code>GC<\/code>\uff0c\u6307\u53d1\u751f\u5728\u8001\u5e74\u4ee3\u7684\u5783\u573e\u6536\u96c6\u52a8\u4f5c\uff0c\u5f53\u51fa\u73b0 <code>Major GC<\/code> \u65f6\uff0c\u4e00\u822c\u4e5f\u4f1a\u4f34\u6709\u81f3\u5c11\u4e00\u6b21\u7684 <code>Minor GC<\/code>\uff08\u5e76\u975e\u7edd\u5bf9\uff0c\u4f8b\u5982 <code>Parallel Scavenge<\/code> \u6536\u96c6\u5668\u4f1a\u5355\u72ec\u76f4\u63a5\u89e6\u53d1 <code>Major GC<\/code> \u7684\u673a\u5236\uff09\u3002 <code>Major GC<\/code> \u7684\u901f\u5ea6\u4e00\u822c\u4f1a\u6bd4 <code>Minor GC<\/code> \u6162\u5341\u500d\u4ee5\u4e0a\u3002<\/p>\n\n\n\n<p><strong><code>Full GC<\/code>:<\/strong><br>\u6e05\u7406\u6574\u4e2a\u5806\u7a7a\u95f4\u2014\u5305\u62ec\u5e74\u8f7b\u4ee3\u548c\u8001\u5e74\u4ee3\u3002<code>Major GC == Full GC<\/code>\u3002 <\/p>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/blog.csdn.net\/hellozhxy\/article\/details\/80649342\" target=\"_blank\">\u53c2\u8003\uff1a\u804a\u804aJVM\uff08\u56db\uff09\u6df1\u5165\u7406\u89e3Major GC, Full GC, CMS<\/a><\/p>\n\n\n\n<p>\u4ea7\u751f <code>Full GC<\/code> \u53ef\u80fd\u7684\u539f\u56e0\uff1a<\/p>\n\n\n\n<ul><li>\u5e74\u8001\u4ee3\u88ab\u5199\u6ee1\u3002<\/li><li>\u6301\u4e45\u4ee3\u88ab\u5199\u6ee1\u3002<\/li><li><code>System.gc()<\/code> \u88ab\u663e\u793a\u8c03\u7528\u3002<\/li><li>\u4e0a\u4e00\u6b21 <code>GC<\/code> \u4e4b\u540e <code>Heap<\/code> \u7684\u5404\u57df\u5206\u914d\u7b56\u7565\u52a8\u6001\u53d8\u5316\u3002<\/li><\/ul>\n\n\n\n<h2>\u5783\u573e\u6536\u96c6\u5668\uff08<code>GC<\/code>\uff09<\/h2>\n\n\n\n<p>\u4e0d\u540c\u865a\u62df\u673a\u6240\u63d0\u4f9b\u7684\u5783\u573e\u6536\u96c6\u5668\u53ef\u80fd\u4f1a\u6709\u5f88\u5927\u5dee\u522b\uff0c\u4e0b\u9762\u7684\u4f8b\u5b50\u662f <code>HotSpot<\/code>\u3002<\/p>\n\n\n\n<p>\u65b0\u751f\u4ee3\u6536\u96c6\u5668\u4f7f\u7528\u7684\u6536\u96c6\u5668\uff1a<code>Serial<\/code>\u3001<code>PraNew<\/code>\u3001<code>Parallel Scavenge<\/code>\u3002<br>\u8001\u5e74\u4ee3\u6536\u96c6\u5668\u4f7f\u7528\u7684\u6536\u96c6\u5668\uff1a<code>Serial Old<\/code>\u3001<code>Parallel Old<\/code>\u3001<code>CMS<\/code>\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><figure class=\"mdx-lazyload-container\" style=\"max-width:1001px\"><div style=\"padding-top:67.232767232767%\"><\/div><div class=\"mdx-img-loading-sp mdui-valign\"><div><div class=\"mdui-spinner\"><\/div><\/div><\/div><img width=\"1001\" height=\"673\" class=\"lazyload\" title=\"Java\u5783\u573e\u56de\u6536\u673a\u5236\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20190728160845449.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3R6dzE5OTI=,size_16,color_FFFFFF,t_70\" alt=\"https:\/\/img-blog.csdnimg.cn\/20190728160845449.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3R6dzE5OTI=,size_16,color_FFFFFF,t_70\"><\/figure><\/figure>\n\n\n\n<ol><li><code>Serial<\/code> \u6536\u96c6\u5668\uff08\u590d\u5236\u7b97\u6cd5)<br>\u65b0\u751f\u4ee3\u5355\u7ebf\u7a0b\u6536\u96c6\u5668\uff0c\u6807\u8bb0\u548c\u6e05\u7406\u90fd\u662f\u5355\u7ebf\u7a0b\uff0c\u4f18\u70b9\u662f\u7b80\u5355\u9ad8\u6548\u3002<\/li><li><code>Serial Old<\/code>\u6536\u96c6\u5668(\u6807\u8bb0-\u6574\u7406\u7b97\u6cd5)<br>\u8001\u5e74\u4ee3\u5355\u7ebf\u7a0b\u6536\u96c6\u5668\uff0c<code>Serial<\/code> \u6536\u96c6\u5668\u7684\u8001\u5e74\u4ee3\u7248\u672c\u3002<\/li><li><code>ParNew<\/code> \u6536\u96c6\u5668(\u505c\u6b62-\u590d\u5236\u7b97\u6cd5) \u3000<br>\u65b0\u751f\u4ee3\u6536\u96c6\u5668\uff0c\u53ef\u4ee5\u8ba4\u4e3a\u662f <code>Serial<\/code> \u6536\u96c6\u5668\u7684\u591a\u7ebf\u7a0b\u7248\u672c\uff0c\u5728\u591a\u6838 <code>CPU<\/code> \u73af\u5883\u4e0b\u6709\u7740\u6bd4 <code>Serial<\/code> \u66f4\u597d\u7684\u8868\u73b0\u3002<\/li><li><code>Parallel Scavenge<\/code> \u6536\u96c6\u5668(\u505c\u6b62-\u590d\u5236\u7b97\u6cd5)<br>\u5e76\u884c\u6536\u96c6\u5668\uff0c\u8ffd\u6c42\u9ad8\u541e\u5410\u91cf\uff0c\u9ad8\u6548\u5229\u7528 <code>CPU<\/code>\u3002\u541e\u5410\u91cf\u4e00\u822c\u4e3a <code>99%<\/code>\uff0c \u541e\u5410\u91cf <code>=<\/code> \u7528\u6237\u7ebf\u7a0b\u65f6\u95f4 <code>\/<\/code> (\u7528\u6237\u7ebf\u7a0b\u65f6\u95f4 <code>+<\/code> GC\u7ebf\u7a0b\u65f6\u95f4)\u3002\u9002\u5408\u540e\u53f0\u5e94\u7528\u7b49\u5bf9\u4ea4\u4e92\u76f8\u5e94\u8981\u6c42\u4e0d\u9ad8\u7684\u573a\u666f\u3002<\/li><li><code>Parallel Old<\/code> \u6536\u96c6\u5668(\u505c\u6b62-\u590d\u5236\u7b97\u6cd5)<br><code>Parallel Scavenge<\/code> \u6536\u96c6\u5668\u7684\u8001\u5e74\u4ee3\u7248\u672c\uff0c\u5e76\u884c\u6536\u96c6\u5668\uff0c\u541e\u5410\u91cf\u4f18\u5148\u3002<\/li><li><code>CMS(Concurrent Mark Sweep)<\/code> \u6536\u96c6\u5668\uff08\u6807\u8bb0-\u6e05\u7406\u7b97\u6cd5\uff09<br>\u9ad8\u5e76\u53d1\u3001\u4f4e\u505c\u987f\uff0c\u8ffd\u6c42\u6700\u77ed <code>GC<\/code> \u56de\u6536\u505c\u987f\u65f6\u95f4\uff0c<code>cpu<\/code> \u5360\u7528\u6bd4\u8f83\u9ad8\uff0c\u54cd\u5e94\u65f6\u95f4\u5feb\uff0c\u505c\u987f\u65f6\u95f4\u77ed\uff0c\u591a\u6838 <code>cpu<\/code> \u8ffd\u6c42\u9ad8\u54cd\u5e94\u65f6\u95f4\u7684\u9009\u62e9\u3002<\/li><\/ol>\n\n\n\n<p>\u6839\u636e\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u7684\u4e0d\u540c\u5c06\u5185\u5b58\u5212\u5206\u4e3a\u51e0\u5757\uff0c\u7136\u540e\u6839\u636e\u5404\u5757\u7684\u7279\u70b9\u91c7\u7528\u6700\u9002\u5f53\u7684\u6536\u96c6\u7b97\u6cd5\u3002\u5927\u6279\u5bf9\u8c61\u6b7b\u53bb\u3001\u5c11\u91cf\u5bf9\u8c61\u5b58\u6d3b\u7684\uff08\u65b0\u751f\u4ee3\uff09\uff0c\u4f7f\u7528\u590d\u5236\u7b97\u6cd5\uff0c\u590d\u5236\u6210\u672c\u4f4e\uff1b\u5bf9\u8c61\u5b58\u6d3b\u7387\u9ad8\u3001\u6ca1\u6709\u989d\u5916\u7a7a\u95f4\u8fdb\u884c\u5206\u914d\u62c5\u4fdd\u7684\uff08\u8001\u5e74\u4ee3\uff09\uff0c\u91c7\u7528\u6807\u8bb0-\u6e05\u7406\u7b97\u6cd5\u6216\u8005\u6807\u8bb0-\u6574\u7406\u7b97\u6cd5\u3002<\/p>\n\n\n\n<h2>\u56db\u79cd\u5f15\u7528\u72b6\u6001<\/h2>\n\n\n\n<p>\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u5bf9 <code>new<\/code> \u51fa\u6765\u7684\u5bf9\u8c61\u4e5f\u4f1a\u6839\u636e\u91cd\u8981\u7a0b\u5ea6\uff0c\u6709\u4e2a\u7b49\u7ea7\u5212\u5206\u3002\u6709\u4e9b\u5fc5\u987b\u7528\u5230\u7684\u5bf9\u8c61\uff0c\u6211\u4eec\u5e0c\u671b\u5b83\u5728\u5176\u88ab\u5f15\u7528\u7684\u5468\u671f\u5185\u80fd\u4e00\u76f4\u5b58\u5728\uff1b\u6709\u4e9b\u5bf9\u8c61\u53ef\u80fd\u6ca1\u90a3\u4e48\u91cd\u8981\uff0c\u5f53\u5185\u5b58\u7a7a\u95f4\u8fd8\u8db3\u591f\u65f6\uff0c\u53ef\u4ee5\u4fdd\u7559\u5728\u5185\u5b58\u4e2d\uff0c\u5982\u679c\u5185\u5b58\u7a7a\u95f4\u5728\u8fdb\u884c\u5783\u573e\u6536\u96c6\u540e\u8fd8\u662f\u975e\u5e38\u7d27\u5f20\uff0c\u5219\u53ef\u4ee5\u629b\u5f03\u8fd9\u4e9b\u5bf9\u8c61\u3002<br>\u7531\u6b64\uff0c<code>Java<\/code> \u5bf9\u5f15\u7528\u5212\u5206\u4e3a\u56db\u79cd\uff1a\u5f3a\u5f15\u7528\u3001\u8f6f\u5f15\u7528\u3001\u5f31\u5f15\u7528\u3001\u865a\u5f15\u7528\uff0c\u56db\u79cd\u5f15\u7528\u5f3a\u5ea6\u4f9d\u6b21\u51cf\u5f31\u3002<\/p>\n\n\n\n<ol><li>\u5f3a\u5f15\u7528<br>\u4ee3\u7801\u4e2d\u666e\u904d\u5b58\u5728\u7684\u7c7b\u4f3c&#8221;<code>Object obj = new Object()<\/code>&#8220;\u8fd9\u7c7b\u7684\u5f15\u7528\uff0c\u53ea\u8981\u5f3a\u5f15\u7528\u8fd8\u5b58\u5728\uff0c\u5783\u573e\u6536\u96c6\u5668\u6c38\u8fdc\u4e0d\u4f1a\u56de\u6536\u6389\u88ab\u5f15\u7528\u7684\u5bf9\u8c61\u3002<\/li><li>\u8f6f\u5f15\u7528<br>\u63cf\u8ff0\u6709\u4e9b\u8fd8\u6709\u7528\u4f46\u5e76\u975e\u5fc5\u9700\u7684\u5bf9\u8c61\u3002\u5728\u7cfb\u7edf\u5c06\u8981\u53d1\u751f\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38\u4e4b\u524d\uff0c\u5c06\u4f1a\u628a\u8fd9\u4e9b\u5bf9\u8c61\u5217\u8fdb\u56de\u6536\u8303\u56f4\u8fdb\u884c\u4e8c\u6b21\u56de\u6536\u3002\u5982\u679c\u8fd9\u6b21\u56de\u6536\u8fd8\u6ca1\u6709\u8db3\u591f\u7684\u5185\u5b58\uff0c\u624d\u4f1a\u629b\u51fa\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38\u3002<code>Java<\/code> \u4e2d\u7684\u7c7b <code>SoftReference<\/code> \u8868\u793a\u8f6f\u5f15\u7528\u3002<\/li><li>\u5f31\u5f15\u7528<br>\u63cf\u8ff0\u975e\u5fc5\u9700\u5bf9\u8c61\u3002\u88ab\u5f31\u5f15\u7528\u5173\u8054\u7684\u5bf9\u8c61\u53ea\u80fd\u751f\u5b58\u5230\u4e0b\u4e00\u6b21\u5783\u573e\u56de\u6536\u4e4b\u524d\uff0c\u5783\u573e\u6536\u96c6\u5668\u5de5\u4f5c\u4e4b\u540e\uff0c\u65e0\u8bba\u5f53\u524d\u5185\u5b58\u662f\u5426\u8db3\u591f\uff0c\u90fd\u4f1a\u56de\u6536\u6389\u53ea\u88ab\u5f31\u5f15\u7528\u5173\u8054\u7684\u5bf9\u8c61\u3002<code>Java<\/code> \u4e2d\u7684\u7c7b <code>WeakReference<\/code> \u8868\u793a\u5f31\u5f15\u7528\u3002<\/li><li>\u865a\u5f15\u7528<br>\u8fd9\u4e2a\u5f15\u7528\u5b58\u5728\u7684\u552f\u4e00\u76ee\u7684\u5c31\u662f\u5728\u8fd9\u4e2a\u5bf9\u8c61\u88ab\u6536\u96c6\u5668\u56de\u6536\u65f6\u6536\u5230\u4e00\u4e2a\u7cfb\u7edf\u901a\u77e5\uff0c\u88ab\u865a\u5f15\u7528\u5173\u8054\u7684\u5bf9\u8c61\uff0c\u548c\u5176\u751f\u5b58\u65f6\u95f4\u5b8c\u5168\u6ca1\u5173\u7cfb\u3002<code>Java<\/code> \u4e2d\u7684\u7c7b <code>PhantomReference<\/code> \u8868\u793a\u865a\u5f15\u7528\u3002<\/li><\/ol>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\" style=\"flex-basis:100%\">\n<pre class=\"wp-block-preformatted\"><strong>\u53c2\u8003\u8d44\u6599\uff1a<\/strong>\n<strong>\n<\/strong><a rel=\"noreferrer noopener\" href=\"https:\/\/blog.csdn.net\/tangzwgo\/article\/details\/97545742\" data-type=\"URL\" data-id=\"https:\/\/blog.csdn.net\/tangzwgo\/article\/details\/97545742\" target=\"_blank\"><span class=\"has-inline-color has-luminous-vivid-orange-color\">Java\u5783\u573e\u56de\u6536\u673a\u5236<\/span><\/a><span class=\"has-inline-color has-luminous-vivid-orange-color\">\n<\/span><a rel=\"noreferrer noopener\" href=\"https:\/\/www.jianshu.com\/p\/b78ac4bf13ae\" data-type=\"URL\" data-id=\"https:\/\/www.jianshu.com\/p\/b78ac4bf13ae\" target=\"_blank\"><span class=\"has-inline-color has-luminous-vivid-orange-color\">Java \u5783\u573e\u56de\u6536\u673a\u5236\u6574\u7406<\/span><\/a><\/pre>\n<\/div>\n<\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5783\u573e\u56de\u6536\u7684\u610f\u4e49 Java\u8bed\u8a00\u4e2d\u4e00\u4e2a\u663e\u8457\u7684\u7279\u70b9\u5c31\u662f\u5f15\u5165\u4e86\u5783\u573e\u56de\u6536\u673a\u5236\uff0c\u4f7fc++\u7a0b\u5e8f\u5458\u6700\u5934\u75bc\u7684\u5185\u5b58\u7ba1\u7406\u7684\u95ee\u9898\u8fce\u5203\u800c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":128,"comment_status":"open","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":[],"categories":[4],"tags":[5],"_links":{"self":[{"href":"http:\/\/17enter.com\/index.php?rest_route=\/wp\/v2\/posts\/97"}],"collection":[{"href":"http:\/\/17enter.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/17enter.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/17enter.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/17enter.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=97"}],"version-history":[{"count":26,"href":"http:\/\/17enter.com\/index.php?rest_route=\/wp\/v2\/posts\/97\/revisions"}],"predecessor-version":[{"id":151,"href":"http:\/\/17enter.com\/index.php?rest_route=\/wp\/v2\/posts\/97\/revisions\/151"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/17enter.com\/index.php?rest_route=\/wp\/v2\/media\/128"}],"wp:attachment":[{"href":"http:\/\/17enter.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=97"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/17enter.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=97"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/17enter.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=97"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}