{"id":993,"date":"2018-09-17T19:06:49","date_gmt":"2018-09-17T10:06:49","guid":{"rendered":"https:\/\/chat-messenger.com\/?p=993"},"modified":"2019-06-30T18:44:15","modified_gmt":"2019-06-30T09:44:15","slug":"runtime-totalmemory-freememory","status":"publish","type":"post","link":"https:\/\/chat-messenger.com\/zh_tw\/\u90e8\u843d\u683c\/java\/\u904b\u884c\u6642\u7e3d\u5167\u5b58\u7a7a\u9592\u5167\u5b58","title":{"rendered":"\u53d6\u5f97Java\u8a18\u61b6\u9ad4\u4f7f\u7528\u60c5\u6cc1"},"content":{"rendered":"<h2 class=\"common_title\"><a name=\"0\">Java <strong>\u8a18\u61b6<\/strong>\u53d6\u5f97\u4f7f\u7528\u60c5\u6cc1 <strong>Runtime.getRuntime().totalMemory, freeMemory<\/strong><\/a><\/h2>\n<p>\n<strong>Java <\/strong> \u50b3\u56de\u865b\u64ec\u6a5f\u5668\u8a18\u61b6\u9ad4\u8cc7\u8a0a\u7684\u300c\u7e3d\u8a08\u300d\u3001\u300c\u5df2\u4f7f\u7528\u300d\u548c\u300c\u6700\u5927\u53ef\u7528\u300d\u8cc7\u8a0a\u3002<br \/>\n\u5404\u9805\u76ee\u7684\u89e3\u91cb\u5982\u4e0b\u3002\n<\/p>\n<ul>\n<li><strong>\u5168\u90e8\u7684<\/strong>\u2026<strong>Runtime.getRuntime().totalMemory()<\/strong>\u9019\u662f\u5206\u914d\u7d66 Java \u865b\u64ec\u6a5f\u5668\u7684\u8a18\u61b6\u9ad4\u91cf\u3002<\/li>\n<li><strong>\u4f7f\u7528\u91cf<\/strong>\u2026<strong>Runtime.getRuntime().totalMemory()<\/strong>-<strong>Runtime.getRuntime().freeMemory()<\/strong>\u8b8a\u5f97\uff0c<br \/>\n\u76ee\u524d\u5728\u8a18\u61b6\u9ad4\u4e2d\u5206\u914d\u7684\u7269\u4ef6\u7684\u8a18\u61b6\u9ad4\u4f7f\u7528\u60c5\u6cc1\u3002<\/li>\n<li><strong>\u6700\u5927\u53ef\u7528<\/strong>\u2026<strong>Runtime.getRuntime().maxMemory()<\/strong>\u662f Java \u865b\u64ec\u6a5f\u5668\u5c07\u5617\u8a66\u4f7f\u7528\u7684\u6700\u5927\u8a18\u61b6\u9ad4\u91cf\u3002<br \/>\n\u5982\u679c\u4f7f\u7528\u91cf\u63a5\u8fd1\u7e3d\u5bb9\u91cf\uff0c\u4e26\u4e14\u5373\u4f7f\u900f\u904e\u5783\u573e\u56de\u6536\u4e5f\u7121\u6cd5\u4fdd\u8b49\u53ef\u7528\u5167\u5b58\uff0cJava \u865b\u64ec\u6a5f\u5c07\u64f4\u5c55\u5230\u300c\u6700\u5927\u53ef\u7528\u300d\u5bb9\u91cf\u3002<\/li>\n<\/ul>\n<h2 class=\"common_title\"><a name=\"1\">\u7bc4\u4f8b\u7a0b\u5f0f<\/a><\/h2>\n<pre class=\"sample_src\">\/** * \u50b3\u56de\u6709\u95dc Java \u865b\u64ec\u6a5f\u5668\u7684\u7e3d\u8a18\u61b6\u9ad4\u3001\u5df2\u4f7f\u7528\u7684\u8a18\u61b6\u9ad4\u91cf\u4ee5\u53ca\u5b83\u5617\u8a66\u4f7f\u7528\u7684\u6700\u5927\u8a18\u61b6\u9ad4\u91cf\u7684\u8cc7\u8a0a\u3002 * @return Java\u865b\u64ec\u6a5f\u5668\u8a18\u61b6\u9ad4\u8cc7\u8a0a *\/ public static String getMemoryInfo() { DecimalFormat f1 = new DecimalFormat(&quot;#,###KB&quot;); DecimalFormat f2 = new DecimalFormat(&quot;##ime); ).freeMemory() \/ 1024; \u9577\u7e3d\u8a08= Runtime.getRuntime().totalMemory() \/ 1024; \u9577\u6700\u5927\u503c= Runtime.getRuntime().maxMemory() \/ 1024; \u9577\u5df2\u4f7f\u7528= \u7e3d\u8a08- \u7a7a\u9592; \u96d9\u500d\u6bd4\u7387= (\u5df2\u4f7f\u7528* 100 \/ (double)total); String info = &quot;Java\u8a18\u61b6\u9ad4\u8cc7\u8a0a\uff1aTotal = + f1.format(total) + &quot;, &quot; + &quot;Used = + f1.format(used) + &quot; (&quot; + f2.format(\u6bd4\u7387) + &quot;%),&quot; + &quot;\u6700\u5927\u53ef\u7528=&quot;+f1.format(max); \u56de\u50b3\u8a0a\u606f; }\r\n<\/pre>\n<p><script type=\"text\/javascript\" src=\"https:\/\/chat-messenger.com\/js\/common.js?dd12sssas2223\" charset=\"UTF-8\"><\/script><br \/>\n<script type=\"text\/javascript\"> writePR(); <\/script><\/p>\n<h2 class=\"common_title\"><a name=\"2\">\u57f7\u884c\u7d50\u679c1<\/a><\/h2>\n<p>\u25c6\u57f7\u884c\u7bc4\u4f8b<\/p>\n<pre class=\"sample_src\">\u516c\u5171\u975c\u614b\u7121\u6548\u4e3b\uff08\u5b57\u4e32[] args\uff09{ System.out.println\uff08getMemoryInfo\uff08\uff09\uff09; }\r\n<\/pre>\n<p>\u25c6\u8f38\u51fa\u7d50\u679c<\/p>\n<pre class=\"console\">Java\u8a18\u61b6\u9ad4\u8cc7\u8a0a\uff1a\u7e3d\u8a08=1,984KB\uff0c\u4f7f\u7528\u91cf=458KB\uff0823.1%\uff09\uff0c\u6700\u5927\u53ef\u7528=65,088KB\r\n<\/pre>\n<h2 class=\"common_title\"><a name=\"3\">\u57f7\u884c\u7d50\u679c2<\/a><\/h2>\n<p>\u25c6\u57f7\u884c\u7bc4\u4f8b<br \/>\n\u5617\u8a66\u66f4\u6539 Java \u5806\u5927\u5c0f\u4e26\u904b\u884c\u3002<br \/>\nJava \u5806\u5927\u5c0f\u7684\u503c\u53ef\u4ee5\u6307\u5b9a\u70ba Java \u6307\u4ee4\u7684\u9078\u9805\u3002<\/p>\n<div class=\"point\">\njava -Xms64m -Xmx512m \u4e3b\u8981 <\/p>\n<p>-Xms\u521d\u59cb\u5806\u5927\u5c0f<br \/>\n\u6307\u5b9a Java \u865b\u64ec\u6a5f\u5668\u7684\u521d\u59cb\u8a18\u61b6\u9ad4\u5206\u914d\u3002\u9810\u8a2d\u503c\u70ba 2MB\u3002<br \/>\n-Xmx\u6700\u5927\u5806\u758a\u5927\u5c0f<br \/>\n\u6307\u5b9a\u5206\u914d\u7d66 Java \u865b\u64ec\u6a5f\u5668\u7684\u6700\u5927\u8a18\u61b6\u9ad4\u3002\u9810\u8a2d\u503c\u70ba 64MB\u3002\n<\/div>\n\n<pre class=\"sample_src\">\u516c\u5171\u975c\u614b\u7121\u6548\u4e3b\uff08\u5b57\u4e32[] args\uff09{ System.out.println\uff08getMemoryInfo\uff08\uff09\uff09; }\r\n<\/pre>\n<p>\u25c6\u8f38\u51fa\u7d50\u679c<\/p>\n<pre class=\"console\">Java\u8a18\u61b6\u9ad4\u8cc7\u8a0a\uff1a\u7e3d\u8a08=65,088KB\uff0c\u4f7f\u7528\u91cf=524KB\uff080.8%\uff09\uff0c\u6700\u5927\u53ef\u7528=520,256KB\r\n<\/pre>\n<p>\u300c\u7e3d Runtime.getRuntime().totalMemory()\u300d\u662f<strong>-Xms<\/strong>\uff0c\u300c\u6700\u5927\u53ef\u7528Runtime.getRuntime().maxMemory()\u300d\u662f<strong>-Xmx<\/strong>\u5b83\u93c8\u63a5\u5230\u3002<\/p>","protected":false},"excerpt":{"rendered":"<p>\u53d6\u5f97 Java \u8a18\u61b6\u9ad4\u4f7f\u7528\u60c5\u6cc1 Runtime.getRuntime().totalMemory, freeMe [...]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":""},"categories":[19],"tags":[],"_links":{"self":[{"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/posts\/993"}],"collection":[{"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/comments?post=993"}],"version-history":[{"count":9,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/posts\/993\/revisions"}],"predecessor-version":[{"id":3636,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/posts\/993\/revisions\/3636"}],"wp:attachment":[{"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/media?parent=993"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/categories?post=993"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/tags?post=993"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}