{"id":8293,"date":"2023-11-28T20:23:23","date_gmt":"2023-11-28T12:23:23","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=8293"},"modified":"2023-11-28T20:30:46","modified_gmt":"2023-11-28T12:30:46","slug":"java-zhong-zen-me-huo-qujava-cheng-xu-shi-yong-de","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/java-zhong-zen-me-huo-qujava-cheng-xu-shi-yong-de\/","title":{"rendered":"Java\u4e2d\u600e\u4e48\u83b7\u53d6Java\u7a0b\u5e8f\u4f7f\u7528\u7684\u5185\u5b58\uff1f\u5806\u4f7f\u7528\u7684\u767e\u5206\u6bd4\uff1f"},"content":{"rendered":"<p>\u53ef\u4ee5\u901a\u8fc7 java.lang.Runtime\u7c7b\u4e2d\u4e0e\u5185\u5b58\u76f8\u5173\u65b9\u6cd5\u6765\u83b7\u53d6\u5269\u4f59\u7684\u5185\u5b58\uff0c\u603b\u5185\u5b58\u53ca\u6700\u5927\u5806\u5185\u5b58\u3002<br \/>\n\u901a\u8fc7\u8fd9\u4e9b\u65b9\u6cd5\u4f60\u4e5f\u53ef\u4ee5\u83b7\u53d6\u5230\u5806\u4f7f\u7528\u7684\u767e\u5206\u6bd4\u53ca\u5806\u5185\u5b58\u7684\u5269\u4f59\u7a7a\u95f4\u3002<br \/>\nruntime.freeMemory()\u65b9\u6cd5: \u8fd4\u56deJava\u865a\u62df\u673a\u4e2d\u7684\u7a7a\u4f59\u5185\u5b58\u91cf<br \/>\nruntime.totalMemory()\u65b9\u6cd5: \u8fd4\u56de Java\u865a\u62df\u673a\u4e2d\u7684\u5185\u5b58\u603b\u91cf<br \/>\nruntime.maxMemory()\u65b9\u6cd5: \u8fd4\u56deJava\u865a\u62df\u673a\u8bd5\u56fe\u4f7f\u7528\u7684\u6700\u5927\u5185\u5b58\u91cf<\/p>\n<pre><code class=\"language-plain_text\">public static void main(String[] args){\n        Runtime runtime = Runtime.getRuntime();\n        System.out.println(&quot;JVM\u7a7a\u95f2\u5185\u5b58=&quot; + runtime.freeMemory()\/1024\/1024 + &quot;M&quot;);\n        System.out.println(&quot;JVM\u603b\u5185\u5b58=&quot; + runtime.totalMemory()\/1024\/1024 + &quot;M&quot;);\n        System.out.println(&quot;JVM\u53ef\u7528\u6700\u5927\u5185\u5b58=&quot; + runtime.maxMemory()\/1024\/1024 + &quot;M&quot;);\n        String str = &quot;abc&quot;;\n        for (int i = 0; i &lt; 2000; i++){\n            str += &quot;def&quot;+ i;\n        }\n        System.err.println(&quot;str-JVM\u7a7a\u95f2\u5185\u5b58=&quot; + runtime.freeMemory()\/1024\/1024 + &quot;M&quot;);\n        System.err.println(&quot;str-JVM\u603b\u5185\u5b58=&quot; + runtime.totalMemory()\/1024\/1024 + &quot;M&quot;);\n        System.err.println(&quot;str-JVM\u53ef\u7528\u6700\u5927\u5185\u5b58=&quot; + runtime.maxMemory()\/1024\/1024 + &quot;M&quot;);\n        runtime.gc();\n        System.out.println(&quot;\u8c03\u7528gc-JVM\u7a7a\u95f2\u5185\u5b58=&quot; + runtime.freeMemory()\/1024\/1024 + &quot;M&quot;);\n        System.out.println(&quot;\u8c03\u7528gc-JVM\u603b\u5185\u5b58=&quot; + runtime.totalMemory()\/1024\/1024 + &quot;M&quot;);\n        System.out.println(&quot;\u8c03\u7528gc-JVM\u53ef\u7528\u6700\u5927\u5185\u5b58=&quot; + runtime.maxMemory()\/1024\/1024 + &quot;M&quot;);\n    }\n<\/code><\/pre>\n<p>\u4fee\u6539JVM\u5185\u5b58\u65b9\u6cd5:<br \/>\n1\u3001eclispe-&gt;window-&gt;preferences-&gt;Java-&gt;Insualled JRE\uff0c\u70b9\u51fb\u53f3\u4fa7\u7684Edit\u6309\u94ae\uff0c\u5728\u7f16\u8f91\u754c\u9762\u4e2d\u7684\u201cDefault VM Arguments\u201d\u9009\u9879\u4e2d,\u586b\u5165\u5982\u4e0b\u503c\u5373\u53ef:<br \/>\n-Xms64m-Xmx128m<br \/>\n2\u3001\u4ee3\u7801\u5904\u5355\u673a\u53f3\u952e\uff0c\u4f9d\u6b21\u70b9\u51fbRun As-&gt;Run Configurations\uff0c\u5728Arguments \u53c2\u6570\u4e2d\u7684\u201cVM arguments:\u201d\u4e2d\u586b\u5165\u5982\u4e0b\u503c\u5373\u53ef:<br \/>\n-Xms64m -Xmx128m<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u53ef\u4ee5\u901a\u8fc7 java.lang.Runtime\u7c7b\u4e2d\u4e0e\u5185\u5b58\u76f8\u5173\u65b9\u6cd5\u6765\u83b7\u53d6\u5269\u4f59\u7684\u5185\u5b58\uff0c\u603b\u5185\u5b58\u53ca\u6700\u5927\u5806\u5185\u5b58\u3002 \u901a\u8fc7\u8fd9\u4e9b [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[99],"tags":[],"class_list":["post-8293","post","type-post","status-publish","format-standard","hentry","category-javabase"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8293","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=8293"}],"version-history":[{"count":3,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8293\/revisions"}],"predecessor-version":[{"id":8534,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8293\/revisions\/8534"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=8293"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=8293"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=8293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}