{"id":10859,"date":"2023-11-28T21:45:54","date_gmt":"2023-11-28T13:45:54","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=10859"},"modified":"2023-12-07T15:56:09","modified_gmt":"2023-12-07T07:56:09","slug":"jvm-zhong-zi-fu-chuan-chang-liang-cun-fang-zai-na","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/jvm-zhong-zi-fu-chuan-chang-liang-cun-fang-zai-na\/","title":{"rendered":"JVM\u4e2d\u5b57\u7b26\u4e32\u5e38\u91cf\u5b58\u653e\u5728\u54ea\u4e2a\u533a\u57df\uff1f"},"content":{"rendered":"<p>\u5728Java\u865a\u62df\u673a\uff08JVM\uff09\u4e2d\uff0c\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u662f\u4e00\u4e2a\u4e13\u95e8\u7528\u4e8e\u5b58\u653e\u5b57\u7b26\u4e32\u5e38\u91cf\u7684\u533a\u57df\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4f4d\u4e8e\u65b9\u6cd5\u533a\uff08Method Area\uff09\uff0c\u8fd9\u662fJava\u865a\u62df\u673a\u5185\u5b58\u6a21\u578b\u4e2d\u7684\u4e00\u4e2a\u533a\u57df\u3002<\/p>\n<p>\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\uff0c\u5b58\u653e\u7684\u662f\u5728\u7f16\u8bd1\u671f\u786e\u5b9a\u7684\u5b57\u7b26\u4e32\u5e38\u91cf\uff0c\u5305\u62ec\u76f4\u63a5\u4f7f\u7528\u53cc\u5f15\u53f7\uff08&quot; &quot;\uff09\u5b9a\u4e49\u7684\u5b57\u7b26\u4e32\u4ee5\u53ca\u901a\u8fc7<code>String<\/code>\u7c7b\u7684<code>intern()<\/code>\u65b9\u6cd5\u624b\u52a8\u6dfb\u52a0\u5230\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u7684\u5b57\u7b26\u4e32\u3002\u8fd9\u4e9b\u5b57\u7b26\u4e32\u5e38\u91cf\u5728\u7a0b\u5e8f\u8fd0\u884c\u671f\u95f4\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u5b83\u4eec\u7684\u503c\u4e00\u7ecf\u786e\u5b9a\u5c31\u4e0d\u80fd\u88ab\u4fee\u6539\u3002<\/p>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre><code class=\"language-java\">String str1 = &quot;Hello&quot;;  \/\/ \u5b57\u7b26\u4e32&quot;Hello&quot;\u88ab\u653e\u5165\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\nString str2 = &quot;Hello&quot;;  \/\/ \u76f4\u63a5\u4f7f\u7528\u76f8\u540c\u7684\u5b57\u7b26\u4e32\u5e38\u91cf\uff0c\u4e0d\u4f1a\u521b\u5efa\u65b0\u7684\u5bf9\u8c61\n\nString str3 = new String(&quot;Hello&quot;);  \/\/ \u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\nString str4 = str3.intern();  \/\/ \u5c06\u5b57\u7b26\u4e32\u5bf9\u8c61\u624b\u52a8\u6dfb\u52a0\u5230\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\n\nSystem.out.println(str1 == str2);  \/\/ true\uff0c\u56e0\u4e3a\u5b83\u4eec\u5f15\u7528\u7684\u662f\u76f8\u540c\u7684\u5b57\u7b26\u4e32\u5e38\u91cf\nSystem.out.println(str1 == str3);  \/\/ false\uff0c\u56e0\u4e3astr3\u5f15\u7528\u7684\u662f\u5806\u4e2d\u7684\u65b0\u5bf9\u8c61\nSystem.out.println(str1 == str4);  \/\/ true\uff0c\u56e0\u4e3astr4\u5f15\u7528\u7684\u662f\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u7684\u5bf9\u8c61\n<\/code><\/pre>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728Java 7\u53ca\u4e4b\u524d\u7684\u7248\u672c\u4e2d\uff0c\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4f4d\u4e8e\u6c38\u4e45\u4ee3\uff08PermGen\uff09\u4e2d\u3002\u4f46\u5728Java 8\u53ca\u4ee5\u540e\u7684\u7248\u672c\u4e2d\uff0c\u6c38\u4e45\u4ee3\u88ab\u79fb\u9664\uff0c\u53d6\u800c\u4ee3\u4e4b\u7684\u662f\u5143\u7a7a\u95f4\uff08Metaspace\uff09\uff0c\u800c\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u5219\u88ab\u79fb\u81f3\u5806\u5185\u5b58\u4e2d\u7684\u4e00\u90e8\u5206\u3002\u56e0\u6b64\uff0c\u5177\u4f53\u7684\u5b9e\u73b0\u53ef\u80fd\u4f1a\u56e0Java\u865a\u62df\u673a\u7248\u672c\u7684\u4e0d\u540c\u800c\u6709\u6240\u53d8\u5316\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Java\u865a\u62df\u673a\uff08JVM\uff09\u4e2d\uff0c\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u662f\u4e00\u4e2a\u4e13\u95e8\u7528\u4e8e\u5b58\u653e\u5b57\u7b26\u4e32\u5e38\u91cf\u7684\u533a\u57df\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4f4d\u4e8e\u65b9\u6cd5\u533a [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[119],"tags":[],"class_list":["post-10859","post","type-post","status-publish","format-standard","hentry","category-jvm"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10859","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\/9"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=10859"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10859\/revisions"}],"predecessor-version":[{"id":16908,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10859\/revisions\/16908"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=10859"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=10859"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=10859"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}