{"id":4062,"date":"2019-03-29T17:59:17","date_gmt":"2019-03-29T09:59:17","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=4062"},"modified":"2019-03-29T17:59:17","modified_gmt":"2019-03-29T09:59:17","slug":"%e6%89%8b%e6%8a%8a%e6%89%8b%e6%95%99%e4%bd%a0%e9%80%9a%e8%bf%87java%e4%bb%a3%e7%a0%81%e4%bd%93%e9%aa%8c%e5%bc%ba%e5%bc%95%e7%94%a8%e3%80%81%e8%bd%af%e5%bc%95%e7%94%a8%e3%80%81%e5%bc%b1%e5%bc%95","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4062","title":{"rendered":"\u624b\u628a\u624b\u6559\u4f60\u901a\u8fc7Java\u4ee3\u7801\u4f53\u9a8c\u5f3a\u5f15\u7528\u3001\u8f6f\u5f15\u7528\u3001\u5f31\u5f15\u7528\u3001\u865a\u5f15\u7528\u7684\u533a\u522b"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5f3a\u5f15\u7528\u3001\u8f6f\u5f15\u7528\u3001\u5f31\u5f15\u7528\u3001\u865a\u5f15\u7528\u8fd9\u4e9b\u4e1c\u897f\uff0c\u5982\u679c\u4f60\u4eec\u5e73\u65f6\u53ea\u5199 CRUD \u7684\u8bdd\uff0c\u5c31\u53ef\u80fd\u9047\u4e0d\u5230\u3002\u4eca\u5929\u62bd\u4e2a\u65f6\u95f4\uff0c\u6211\u7ed9\u5927\u5bb6\u8bb2\u4e00\u8bb2\u5b83\u4eec\u4e4b\u95f4\u7684\u533a\u522b\u4e0e\u8054\u7cfb\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u8bf4\u4e00\u4e0b\u5b83\u4eec\u7684\u6982\u5ff5\u5427\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5f3a\u5f15\u7528\uff08StrongReference\uff09\uff1a\u5f3a\u5f15\u7528\u662f\u4f7f\u7528\u6700\u666e\u904d\u7684\u5f15\u7528\u3002\u5982\u679c\u4e00\u4e2a\u5bf9\u8c61\u5177\u6709\u5f3a\u5f15\u7528\uff0c\u90a3\u5783\u573e\u56de\u6536\u5668\u7edd\u4e0d\u4f1a\u56de\u6536\u5b83\u3002\u5f53\u5185\u5b58\u7a7a\u95f4\u4e0d\u8db3\uff0cJava\u865a\u62df\u673a\u5b81\u613f\u629b\u51faOutOfMemoryError\u9519\u8bef\uff0c\u4f7f\u7a0b\u5e8f\u5f02\u5e38\u7ec8\u6b62\uff0c\u4e5f\u4e0d\u4f1a\u9760\u968f\u610f\u56de\u6536\u5177\u6709\u5f3a\u5f15\u7528\u7684\u5bf9\u8c61\u6765\u89e3\u51b3\u5185\u5b58\u4e0d\u8db3\u7684\u95ee\u9898\u3002<\/li><li>\u8f6f\u5f15\u7528\uff08SoftReference\uff09\uff1a\u5982\u679c\u4e00\u4e2a\u5bf9\u8c61\u53ea\u5177\u6709\u8f6f\u5f15\u7528\uff0c\u5219\u5185\u5b58\u7a7a\u95f4\u8db3\u591f\uff0c\u5783\u573e\u56de\u6536\u5668\u5c31\u4e0d\u4f1a\u56de\u6536\u5b83\uff1b\u5982\u679c\u5185\u5b58\u7a7a\u95f4\u4e0d\u8db3\u4e86\uff0c\u5c31\u4f1a\u56de\u6536\u8fd9\u4e9b\u5bf9\u8c61\u7684\u5185\u5b58\u3002\u53ea\u8981\u5783\u573e\u56de\u6536\u5668\u6ca1\u6709\u56de\u6536\u5b83\uff0c\u8be5\u5bf9\u8c61\u5c31\u53ef\u4ee5\u88ab\u7a0b\u5e8f\u4f7f\u7528\u3002\u8f6f\u5f15\u7528\u53ef\u7528\u6765\u5b9e\u73b0\u5185\u5b58\u654f\u611f\u7684\u9ad8\u901f\u7f13\u5b58\u3002\u8f6f\u5f15\u7528\u53ef\u4ee5\u548c\u4e00\u4e2a\u5f15\u7528\u961f\u5217\uff08ReferenceQueue\uff09\u8054\u5408\u4f7f\u7528\uff0c\u5982\u679c\u8f6f\u5f15\u7528\u6240\u5f15\u7528\u7684\u5bf9\u8c61\u88ab\u5783\u573e\u56de\u6536\u5668\u56de\u6536\uff0cJava\u865a\u62df\u673a\u5c31\u4f1a\u628a\u8fd9\u4e2a\u8f6f\u5f15\u7528\u52a0\u5165\u5230\u4e0e\u4e4b\u5173\u8054\u7684\u5f15\u7528\u961f\u5217\u4e2d\u3002<\/li><li>\u5f31\u5f15\u7528\uff08WeakReference\uff09\uff1a\u5f31\u5f15\u7528\u4e0e\u8f6f\u5f15\u7528\u7684\u533a\u522b\u5728\u4e8e\uff1a\u53ea\u5177\u6709\u5f31\u5f15\u7528\u7684\u5bf9\u8c61\u62e5\u6709\u66f4\u77ed\u6682\u7684\u751f\u547d\u5468\u671f\u3002\u5728\u5783\u573e\u56de\u6536\u5668\u7ebf\u7a0b\u626b\u63cf\u5b83\u6240\u7ba1\u8f96\u7684\u5185\u5b58\u533a\u57df\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4e00\u65e6\u53d1\u73b0\u4e86\u53ea\u5177\u6709\u5f31\u5f15\u7528\u7684\u5bf9\u8c61\uff0c\u4e0d\u7ba1\u5f53\u524d\u5185\u5b58\u7a7a\u95f4\u8db3\u591f\u4e0e\u5426\uff0c\u90fd\u4f1a\u56de\u6536\u5b83\u7684\u5185\u5b58\u3002\u4e0d\u8fc7\uff0c\u7531\u4e8e\u5783\u573e\u56de\u6536\u5668\u662f\u4e00\u4e2a\u4f18\u5148\u7ea7\u5f88\u4f4e\u7684\u7ebf\u7a0b\uff0c\u56e0\u6b64\u4e0d\u4e00\u5b9a\u4f1a\u5f88\u5feb\u53d1\u73b0\u90a3\u4e9b\u53ea\u5177\u6709\u5f31\u5f15\u7528\u7684\u5bf9\u8c61\u3002\u5f31\u5f15\u7528\u53ef\u4ee5\u548c\u4e00\u4e2a\u5f15\u7528\u961f\u5217\uff08ReferenceQueue\uff09\u8054\u5408\u4f7f\u7528\uff0c\u5982\u679c\u5f31\u5f15\u7528\u6240\u5f15\u7528\u7684\u5bf9\u8c61\u88ab\u5783\u573e\u56de\u6536\uff0cJava\u865a\u62df\u673a\u5c31\u4f1a\u628a\u8fd9\u4e2a\u5f31\u5f15\u7528\u52a0\u5165\u5230\u4e0e\u4e4b\u5173\u8054\u7684\u5f15\u7528\u961f\u5217\u4e2d\u3002<\/li><li>\u865a\u5f15\u7528\uff08PhantomReference\uff09\uff1a\u201c\u865a\u5f15\u7528\u201d\u987e\u540d\u601d\u4e49\uff0c\u5c31\u662f\u5f62\u540c\u865a\u8bbe\uff0c\u4e0e\u5176\u4ed6\u51e0\u79cd\u5f15\u7528\u90fd\u4e0d\u540c\uff0c\u865a\u5f15\u7528\u5e76\u4e0d\u4f1a\u51b3\u5b9a\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u3002\u5982\u679c\u4e00\u4e2a\u5bf9\u8c61\u4ec5\u6301\u6709\u865a\u5f15\u7528\uff0c\u90a3\u4e48\u5b83\u5c31\u548c\u6ca1\u6709\u4efb\u4f55\u5f15\u7528\u4e00\u6837\uff0c\u5728\u4efb\u4f55\u65f6\u5019\u90fd\u53ef\u80fd\u88ab\u5783\u573e\u56de\u6536\u5668\u56de\u6536\u3002\u865a\u5f15\u7528\u4e3b\u8981\u7528\u6765\u8ddf\u8e2a\u5bf9\u8c61\u88ab\u5783\u573e\u56de\u6536\u5668\u56de\u6536\u7684\u6d3b\u52a8\u3002\u865a\u5f15\u7528\u4e0e\u8f6f\u5f15\u7528\u548c\u5f31\u5f15\u7528\u7684\u4e00\u4e2a\u533a\u522b\u5728\u4e8e\uff1a\u865a\u5f15\u7528\u5fc5\u987b\u548c\u5f15\u7528\u961f\u5217 \uff08ReferenceQueue\uff09\u8054\u5408\u4f7f\u7528\u3002\u5f53\u5783\u573e\u56de\u6536\u5668\u51c6\u5907\u56de\u6536\u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0c\u5982\u679c\u53d1\u73b0\u5b83\u8fd8\u6709\u865a\u5f15\u7528\uff0c\u5c31\u4f1a\u5728\u56de\u6536\u5bf9\u8c61\u7684\u5185\u5b58\u4e4b\u524d\uff0c\u628a\u8fd9\u4e2a\u865a\u5f15\u7528\u52a0\u5165\u5230\u4e0e\u4e4b \u5173\u8054\u7684\u5f15\u7528\u961f\u5217\u4e2d\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">4 \u79cd\u5f15\u7528\u7684\u7ea7\u522b\u7531\u9ad8\u5230\u4f4e\u4f9d\u6b21\u4e3a\uff1a\u5f3a\u5f15\u7528 &gt; \u8f6f\u5f15\u7528 &gt; \u5f31\u5f15\u7528 &gt; \u865a\u5f15\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u7740\u6211\u4eec\u5148\u6765\u770b demo\uff0c\u7136\u540e\u518d\u6765\u603b\u7ed3\u5427\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u51c6\u5907\u516c\u53f8\u5148\u505a\u597d\uff0c\u5148\u521b\u5efa\u4e00\u4e2a XttblogReference \u7c7b\u3002\u5e76\u91cd\u5199 finalize \u65b9\u6cd5\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class XttblogReference{\n    @Override\n    protected void finalize() throws Throwable {\n        super.finalize();\n        System.out.println(\"now time : \" + System.currentTimeMillis() + \" is gc\");\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"> \u7136\u540e\u518d\u521b\u5efa\u4e00\u4e2a\u5927\u91cf\u6d88\u8017\u5185\u5b58\u7684\u7c7b ReferenceTest\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class ReferenceTest {\n    \/\/ \u6d88\u8017\u5927\u91cf\u5185\u5b58\n    public static void drainMemory() {\n        String[] array = new String[1024 * 10];\n        for(int i = 0; i &lt; 1024 * 10; i++) {\n            for(int j = 'a'; j &lt;= 'z'; j++) {\n                array[i] += (char)j;\n            }\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7136\u540e\uff0c\u6211\u4eec\u5148\u4ec0\u4e48\u4e5f\u4e0d\u505a\u3002\u8fd0\u884c\u4e0b\u9762\u7684\u4ee3\u7801\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class XttblogTest {\n    public static void main(String[] args) {\n        XttblogReference xttblogReference = new XttblogReference();\n        \/\/\u624b\u52a8\u8bbe\u7f6e\u4e3anull\uff0c\u6e05\u9664\u5bf9\u8c61\n        xttblogReference = null;\n        System.out.println(\"\u6211\u8fd0\u884c\u5b8c\u4e86\u3002\u3002\u3002\");\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\u5b8c\u6210\u540e\uff0c\u63a7\u5236\u53f0\u76f4\u63a5\u6253\u5370\u201c\u6211\u8fd0\u884c\u5b8c\u4e86\u3002\u3002\u3002\u201d\u3002XttblogReference \u4e2d\u91cd\u5199\u7684 finalize \u65b9\u6cd5\u5e76\u6ca1\u6709\u6267\u884c\u3002\u8fd9\u8bf4\u660e\u6ca1\u6709\u8fdb\u884c\u56de\u6536\u3002\u7ed3\u679c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcly1g1jt4gr4a2j20bp02oaac.jpg\" alt=\"\" \/><figcaption>\u624b\u52a8\u8bbe\u7f6e\u4e3anull\uff0c\u6e05\u9664\u5bf9\u8c61<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u7136\u540e\uff0c\u6211\u4eec\u5728\u770b\u7b2c\u4e8c\u79cd\u60c5\u51b5\uff0c\u663e\u5f0f\u8c03\u7528\u5783\u573e\u56de\u6536 gc\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class XttblogTest {\n    public static void main(String[] args) {\n        XttblogReference xttblogReference = new XttblogReference();\n        \/\/\u624b\u52a8\u8bbe\u7f6e\u4e3anull\uff0c\u6e05\u9664\u5bf9\u8c61\n        xttblogReference = null;\n        System.gc();\n        System.out.println(\"\u6211\u8fd0\u884c\u5b8c\u4e86\u3002\u3002\u3002\");\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"> \u8fd0\u884c\u7ed3\u679c\u622a\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcly1g1jt68p0ewj20ax02ymxl.jpg\" alt=\"\" \/><figcaption>\u663e\u5f0f\u8c03\u7528\u5783\u573e\u56de\u6536 gc<br><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u8bf4\u660e\uff0c\u5f53\u6211\u4eec\u8c03\u7528\u4e86 System.gc() \u540e\uff0cJVM \u8fdb\u884c\u4e86\u5783\u573e\u56de\u6536\uff0cXttblogReference \u7684 finalize() \u65b9\u6cd5\u88ab\u6267\u884c\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u518d\u6765\u770b\u7b2c\u4e09\u79cd\u60c5\u51b5\uff0c\u6211\u4eec\u4e0d\u76f4\u63a5\u8c03\u7528 System.gc() \u4e86\uff0c\u6211\u4eec\u591a\u6b21\u8c03\u7528 ReferenceTest.drainMemory()\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class XttblogTest {\n    public static void main(String[] args) {\n        XttblogReference xttblogReference = new XttblogReference();\n        \/\/\u624b\u52a8\u8bbe\u7f6e\u4e3anull\uff0c\u6e05\u9664\u5bf9\u8c61\n        xttblogReference = null;\n        \/\/System.gc();\n        ReferenceTest.drainMemory();\n        ReferenceTest.drainMemory();\n        ReferenceTest.drainMemory();\n        ReferenceTest.drainMemory();\n        System.out.println(\"\u6211\u8fd0\u884c\u5b8c\u4e86\u3002\u3002\u3002\");\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\u7ed3\u679c\u622a\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcly1g1jt839etpj20el0410ta.jpg\" alt=\"\" \/><figcaption>\u89e6\u53d1 JVM \u8fdb\u884c\u5783\u573e\u56de\u6536<br><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u8bf4\u660e\uff0c\u6211\u4eec\u867d\u7136\u6ca1\u6709\u663e\u5f0f\u8c03\u7528\u5783\u573e\u56de\u6536\u65b9\u6cd5 System.gc()\uff0c\u4f46\u662f\u7531\u4e8e\u8fd0\u884c\u4e86\u8017\u8d39\u5927\u91cf\u5185\u5b58\u7684\u65b9\u6cd5\uff0c\u89e6\u53d1 JVM \u8fdb\u884c\u5783\u573e\u56de\u6536\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a 3 \u79cd\u60c5\u51b5\u8bf4\u660e\uff1aJVM \u7684\u5783\u573e\u56de\u6536\u673a\u5236\uff0c\u5728\u5185\u5b58\u5145\u8db3\u7684\u60c5\u51b5\u4e0b\uff0c\u9664\u975e\u4f60\u663e\u5f0f\u8c03\u7528 System.gc()\uff0c\u5426\u5219\u5b83\u4e0d\u4f1a\u8fdb\u884c\u5783\u573e\u56de\u6536\uff1b\u5728\u5185\u5b58\u4e0d\u8db3\u7684\u60c5\u51b5\u4e0b\uff0c\u5783\u573e\u56de\u6536\u5c06\u81ea\u52a8\u8fd0\u884c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u7740\u6211\u4eec\u6765\u770b\u4e00\u79cd\u5f3a\u5f15\u7528\u73b0\u8c61\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public static void main(String[] args) {\n    XttblogReference xttblogReference = new XttblogReference();\n    System.gc();\n    System.out.println(\"\u6211\u8fd0\u884c\u5b8c\u4e86\u3002\u3002\u3002\");\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u76f4\u63a5\u8fd0\u884c\u540e\uff0c\u6548\u679c\u622a\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcly1g1jtabcc9ij20ba03xmxh.jpg\" alt=\"\" \/><figcaption>\u5f3a\u5f15\u7528\u73b0\u8c61<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u8bf4\u660e\uff0c\u5373\u4f7f\u663e\u5f0f\u8c03\u7528\u4e86\u5783\u573e\u56de\u6536 System.gc()\uff0c\u4f46\u662f\u7528\u4e8e XttblogReference \u662f\u5f3a\u5f15\u7528\uff0cXttblogReference \u6ca1\u6709\u88ab\u56de\u6536\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u518d\u6765\u770b\u770b\u8f6f\u5f15\u7528\u7684\u60c5\u51b5\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public static void main(String[] args) {\n    SoftReference ref = new SoftReference(new XttblogReference());\n    ReferenceTest.drainMemory();\n    ReferenceTest.drainMemory();\n    ReferenceTest.drainMemory();\n    ReferenceTest.drainMemory();\n    ReferenceTest.drainMemory();\n    ReferenceTest.drainMemory();\n    ReferenceTest.drainMemory();\n    System.out.println(\"\u6211\u8fd0\u884c\u5b8c\u4e86\u3002\u3002\u3002\");\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\u7ed3\u679c\u663e\u793a\uff0c\u6ca1\u6709\u6267\u884c XttblogReference \u4e2d\u7684 finalize \u65b9\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u8bf4\u660e\uff0c\u5728\u5185\u5b58\u4e0d\u8db3\u65f6\uff0c\u8f6f\u5f15\u7528\u88ab\u7ec8\u6b62\u3002\u5f53\u8f6f\u5f15\u7528\u88ab\u7981\u6b62\u65f6\uff0c\u4e0a\u9762\u7684\u4ee3\u7801\u7b49\u4ef7\u4e8e\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>XttblogReference xref = new XttblogReference();\n\/\/ \u7531JVM\u51b3\u5b9a\u8fd0\u884c\nif(JVM.\u5185\u5b58\u4e0d\u8db3()) {\n    xref = null;\n    System.gc();\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u5728\u6765\u770b\u770b\u5f31\u5f15\u7528\u7684\u60c5\u51b5\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public static void main(String[] args) {\n    WeakReference ref = new WeakReference(new XttblogReference());\n    System.gc();\n    System.out.println(\"\u6211\u8fd0\u884c\u5b8c\u4e86\u3002\u3002\u3002\");\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\u7ed3\u679c\u622a\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcly1g1jtcotdh4j20b403lgm1.jpg\" alt=\"\" \/><figcaption>\u5f31\u5f15\u7528<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u8bf4\u660e\uff0c\u5728 JVM \u5783\u573e\u56de\u6536\u8fd0\u884c\u65f6\uff0c\u5f31\u5f15\u7528\u88ab\u7ec8\u6b62\u3002\u4e0a\u9762\u7684\u4ee3\u7801\u7b49\u4ef7\u4e8e\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>XttblogReference xref = new XttblogReference();\n\/\/ \u7531JVM\u51b3\u5b9a\u8fd0\u884c\nif(JVM.\u5185\u5b58\u4e0d\u8db3()) {\n    xref = null;\n    System.gc();\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\uff0c\u6211\u4eec\u5728\u6765\u770b\u5047\u8c61\u5f15\u7528\uff0c\u4e5f\u5c31\u662f\u865a\u5f15\u7528\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public static void main(String[] args) {\n    ReferenceQueue queue = new ReferenceQueue();\n    PhantomReference ref = new PhantomReference(new XttblogReference(), queue);\n    System.out.println(ref.get());\n    System.gc();\n    System.out.println(\"\u6211\u8fd0\u884c\u5b8c\u4e86\u3002\u3002\u3002\");\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcly1g1jteo8m19j20aj04it96.jpg\" alt=\"\" \/><figcaption>\u865a\u5f15\u7528<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u8bf4\u660e\uff0c\u5047\u8c61\u5f15\u7528\uff0c\u865a\u5f15\u7528\uff0c\u5728\u5b9e\u4f8b\u5316\u540e\uff0c\u5c31\u88ab\u7ec8\u6b62\u4e86\u3002\u4e0a\u9762\u7684\u4ee3\u7801\u7b49\u4ef7\u4e8e\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>XttblogReference xttblog = new XttblogReference();\nxttblog = null;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\u7528\u4e00\u5f20\u8868\u683c\u603b\u7ed3\u4e00\u4e0b\u5b83\u4eec\u4e4b\u95f4\u7684\u533a\u522b\u3002<\/p>\n\n\n\n<table class=\"wp-block-table\"><tbody><tr><td>\u5f15\u7528\u7ea7\u522b\n<\/td><td>\u5783\u573e\u56de\u6536\u65f6\u95f4\n<\/td><td>\u7528\u9014\n<\/td><td>\u751f\u5b58\u65f6\u95f4<br>\n<\/td><\/tr><tr><td>\u5f3a\u5f15\u7528\n<\/td><td>\u4e0d\u4f1a\u88ab\u56de\u6536\n<\/td><td>\u5bf9\u8c61\u7684\u4e00\u822c\u72b6\u6001\n<\/td><td>JVM\u505c\u6b62\u8fd0\u884c\u65f6\u7ec8\u6b62\n<\/td><\/tr><tr><td>\u8f6f\u5f15\u7528\n<\/td><td>\u5728\u5185\u5b58\u4e0d\u8db3\u65f6\n<\/td><td>\u7f13\u5b58\n<\/td><td>\u5185\u5b58\u4e0d\u8db3\u65f6\u7ec8\u6b62\n<\/td><\/tr><tr><td>\u5f31\u5f15\u7528\n<\/td><td>\u5728\u5783\u573e\u56de\u6536\u65f6\n<\/td><td>\u5bf9\u8c61\u7f13\u5b58\n<\/td><td>gc\u8fd0\u884c\u540e\u7ec8\u6b62\n<\/td><\/tr><tr><td>\u865a\u5f15\u7528\n<\/td><td>Unknown\n<\/td><td>Unknown\n<\/td><td>Unknown\n<\/td><\/tr><\/tbody><\/table>\n\n\n\n<p class=\"wp-block-paragraph\">\u73b0\u5728\uff0c\u5982\u679c\u6211\u95ee\u4f60 Java \u4e2d\u5982\u4f55\u6709\u6548\u5730\u907f\u514d OOM\uff0c\u4f60\u77e5\u9053\u600e\u4e48\u505a\u4e86\u5417\uff1f\u6ce8\u610f\u8fd9\u5f88\u53ef\u80fd\u5c31\u662f\u4e00\u9053\u9762\u8bd5\u9898\u54e6\uff01<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=4062\">\u624b\u628a\u624b\u6559\u4f60\u901a\u8fc7Java\u4ee3\u7801\u4f53\u9a8c\u5f3a\u5f15\u7528\u3001\u8f6f\u5f15\u7528\u3001\u5f31\u5f15\u7528\u3001\u865a\u5f15\u7528\u7684\u533a\u522b<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>\u5f3a\u5f15\u7528\u3001\u8f6f\u5f15\u7528\u3001\u5f31\u5f15\u7528\u3001\u865a\u5f15\u7528\u8fd9\u4e9b\u4e1c\u897f\uff0c\u5982\u679c\u4f60\u4eec\u5e73\u65f6\u53ea\u5199 CRUD \u7684\u8bdd\uff0c\u5c31\u53ef\u80fd\u9047\u4e0d\u5230\u3002\u4eca\u5929\u62bd\u4e2a\u65f6\u95f4\uff0c\u6211\u7ed9\u5927\u5bb6 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[262,1951,1949,1952,1950],"class_list":["post-4062","post","type-post","status-publish","format-standard","hentry","category-java","tag-java","tag-1951","tag-1949","tag-1952","tag-1950"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4062","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4062"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4062\/revisions"}],"predecessor-version":[{"id":4063,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4062\/revisions\/4063"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4062"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4062"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4062"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}