{"id":10803,"date":"2023-11-28T21:44:03","date_gmt":"2023-11-28T13:44:03","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=10803"},"modified":"2023-12-07T14:58:21","modified_gmt":"2023-12-07T06:58:21","slug":"jvm-zhong-ruo-yin-yong-le-jie-ma","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/jvm-zhong-ruo-yin-yong-le-jie-ma\/","title":{"rendered":"JVM\u4e2d\u5f31\u5f15\u7528\u4e86\u89e3\u5417\uff1f"},"content":{"rendered":"<p>\u5f31\u5f15\u7528\uff08Weak Reference\uff09\u662fJava\u4e2d\u5f15\u7528\u7c7b\u578b\u7684\u4e00\u79cd\uff0c\u7528\u4e8e\u63cf\u8ff0\u4e00\u79cd\u6bd4\u8f6f\u5f15\u7528\u66f4\u5f31\u7684\u5f15\u7528\u5173\u7cfb\u3002\u5728Java\u865a\u62df\u673a\u4e2d\uff0c\u5f31\u5f15\u7528\u7684\u5bf9\u8c61\u5728\u5783\u573e\u56de\u6536\u65f6\uff0c\u53ea\u8981\u6ca1\u6709\u88ab\u5f3a\u5f15\u7528\u5173\u8054\uff0c\u5c31\u4f1a\u88ab\u56de\u6536\u3002<\/p>\n<p>\u5728Java\u4e2d\uff0c\u5f31\u5f15\u7528\u4e3b\u8981\u901a\u8fc7<code>java.lang.ref.WeakReference<\/code>\u7c7b\u6765\u8868\u793a\u3002\u521b\u5efa\u5f31\u5f15\u7528\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u6784\u9020\u65b9\u6cd5\u5c06\u8981\u88ab\u5f15\u7528\u7684\u5bf9\u8c61\u4f20\u5165\uff1a<\/p>\n<pre><code class=\"language-java\">Object referent = new Object();\nWeakReference&lt;Object&gt; weakReference = new WeakReference&lt;&gt;(referent);\n<\/code><\/pre>\n<p>\u5f31\u5f15\u7528\u7684\u4e3b\u8981\u7279\u70b9\u5305\u62ec\uff1a<\/p>\n<ol>\n<li>\n<strong>\u5f31\u5f15\u7528\u4e0d\u4f1a\u963b\u6b62\u88ab\u5f15\u7528\u5bf9\u8c61\u88ab\u5783\u573e\u56de\u6536\uff1a<\/strong> \u5f53\u5783\u573e\u56de\u6536\u5668\u8fd0\u884c\u65f6\uff0c\u5982\u679c\u4e00\u4e2a\u5bf9\u8c61\u53ea\u88ab\u5f31\u5f15\u7528\u5f15\u7528\uff0c\u90a3\u4e48\u8be5\u5bf9\u8c61\u5c31\u4f1a\u88ab\u56de\u6536\uff0c\u5373\u4f7f\u5185\u5b58\u7a7a\u95f4\u5145\u8db3\u3002\n<\/li>\n<li>\n<strong>WeakReference\u7c7b\u7684get\u65b9\u6cd5\uff1a<\/strong> \u901a\u8fc7<code>WeakReference<\/code>\u7c7b\u7684<code>get()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u5230\u88ab\u5f15\u7528\u7684\u5bf9\u8c61\u3002\u4f46\u662f\uff0c\u5982\u679c\u88ab\u5f15\u7528\u7684\u5bf9\u8c61\u5df2\u7ecf\u88ab\u5783\u573e\u56de\u6536\uff0c<code>get()<\/code>\u65b9\u6cd5\u5c06\u8fd4\u56de<code>null<\/code>\u3002\n<\/li>\n<\/ol>\n<pre><code class=\"language-java\">Object retrievedObject = weakReference.get();\n<\/code><\/pre>\n<ol start=\"3\">\n<li><strong>\u7528\u9014\uff1a<\/strong> \u5f31\u5f15\u7528\u901a\u5e38\u7528\u4e8e\u5b9e\u73b0\u4e00\u4e9b\u7f13\u5b58\u6216\u5f15\u7528\u7ba1\u7406\u7b56\u7565\uff0c\u5141\u8bb8\u5783\u573e\u56de\u6536\u5668\u81ea\u52a8\u7ba1\u7406\u4e00\u4e9b\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u5f31\u5f15\u7528\u6765\u5b9e\u73b0\u4e00\u4e2a\u7f13\u5b58\uff0c\u5f53\u5185\u5b58\u4e0d\u8db3\u65f6\uff0c\u5783\u573e\u56de\u6536\u5668\u53ef\u4ee5\u81ea\u52a8\u6e05\u7406\u4e0d\u518d\u88ab\u5f3a\u5f15\u7528\u7684\u7f13\u5b58\u9879\u3002<\/li>\n<\/ol>\n<p>\u4f7f\u7528\u5f31\u5f15\u7528\u65f6\u9700\u8981\u6ce8\u610f\u4e00\u4e9b\u6f5c\u5728\u7684\u95ee\u9898\uff0c\u4f8b\u5982\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u80fd\u4f1a\u8fc7\u65e9\u5730\u88ab\u56de\u6536\u3002\u5f31\u5f15\u7528\u9002\u7528\u4e8e\u4e00\u4e9b\u8f85\u52a9\u6027\u7684\u6570\u636e\u7f13\u5b58\uff0c\u4f46\u4e0d\u9002\u7528\u4e8e\u5fc5\u987b\u4fdd\u6301\u4e00\u5b9a\u65f6\u95f4\u7684\u573a\u666f\u3002<\/p>\n<pre><code class=\"language-java\">\/\/ \u5f31\u5f15\u7528\u7684\u793a\u4f8b\nObject referent = new Object();\nWeakReference&lt;Object&gt; weakReference = new WeakReference&lt;&gt;(referent);\n\n\/\/ \u83b7\u53d6\u88ab\u5f15\u7528\u7684\u5bf9\u8c61\nObject retrievedObject = weakReference.get();\n\n\/\/ \u5982\u679c\u88ab\u5f15\u7528\u7684\u5bf9\u8c61\u672a\u88ab\u5783\u573e\u56de\u6536\uff0cretrievedObject\u5c06\u4e0d\u4e3anull\n<\/code><\/pre>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5f31\u5f15\u7528\u5e76\u4e0d\u662f\u53ef\u963b\u6b62\u5783\u573e\u56de\u6536\u7684\u7edd\u5bf9\u624b\u6bb5\uff0c\u5b83\u53ea\u662f\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u5f31\u7684\u5f15\u7528\u5173\u7cfb\uff0c\u5783\u573e\u56de\u6536\u5668\u4f1a\u66f4\u5bb9\u6613\u56de\u6536\u88ab\u5f31\u5f15\u7528\u5173\u8054\u7684\u5bf9\u8c61\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f31\u5f15\u7528\uff08Weak Reference\uff09\u662fJava\u4e2d\u5f15\u7528\u7c7b\u578b\u7684\u4e00\u79cd\uff0c\u7528\u4e8e\u63cf\u8ff0\u4e00\u79cd\u6bd4\u8f6f\u5f15\u7528\u66f4\u5f31\u7684\u5f15\u7528\u5173\u7cfb\u3002\u5728Jav [&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-10803","post","type-post","status-publish","format-standard","hentry","category-jvm"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10803","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=10803"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10803\/revisions"}],"predecessor-version":[{"id":16899,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10803\/revisions\/16899"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=10803"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=10803"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=10803"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}