{"id":266,"date":"2026-08-19T18:30:15","date_gmt":"2026-08-19T10:30:15","guid":{"rendered":"https:\/\/mofan.help\/?p=266"},"modified":"2026-08-19T18:30:15","modified_gmt":"2026-08-19T10:30:15","slug":"jdk7%e4%b9%8b%e5%89%8dhashmap%e9%9b%86%e5%90%88%e5%bd%a2%e6%88%90%e7%8e%af%e5%bd%a2%e9%93%be%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/mofan.help\/index.php\/2026\/08\/19\/jdk7%e4%b9%8b%e5%89%8dhashmap%e9%9b%86%e5%90%88%e5%bd%a2%e6%88%90%e7%8e%af%e5%bd%a2%e9%93%be%e8%a1%a8\/","title":{"rendered":"JDK7\u4e4b\u524dHashMap\u96c6\u5408\u5f62\u6210\u73af\u5f62\u94fe\u8868"},"content":{"rendered":"\n<p>\u5728JDK7\u4e4b\u524d\u4f7f\u7528HashMap\u7684\u65f6\u5019\uff0c\u5982\u679c\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u4f1a\u5bfc\u81f4\u96c6\u5408\u5728\u6269\u5bb9\u7684\u65f6\u5019\u5f62\u6210\u73af\u5f62\u94fe\u8868\uff0c\u51fa\u73b0\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u95ee\u9898\u51fa\u73b0\u7684\u539f\u56e0<\/h1>\n\n\n\n<p>\u5f53\u6570\u7ec4\u7684size>\u6570\u7ec4\u957f\u5ea6*\u4e00\u4e2a\u56e0\u5b50\uff08\u9ed8\u8ba4\u4e3a0.75\uff09\u65f6\u4f1a\u89e6\u53d1\u6570\u7ec4\u6269\u5bb9\uff0c\u5176\u5b9e\u4e5f\u5c31\u662f\u65b0\u5efa\u4e00\u4e2a\u6570\u7ec4+\u94fe\u8868\u7684\u6570\u636e\u7ed3\u6784\uff08\u5927\u5c0f\u4e3aOld\u6570\u7ec4\u7684\u4e24\u500d\uff09\uff0c\u7136\u540e\u5c06\u6570\u636e\u8fdb\u884c\u62f7\u8d1d\uff0c\u5f15\u7528\u6307\u5411\u65b0\u7684\u6570\u7ec4\uff0c\u5728\u62f7\u8d1d\u6570\u636e\u65f6\u4f1a\u8c03\u7528transfer\u65b9\u6cd5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>void transfer(Entry&#91;] newTable) {\n    for (Entry&lt;K,V> e : table) {\n        while (null != e) {\n            Entry&lt;K,V> next = e.next; \/\/ (1) \u5173\u952e\u70b9\uff1a\u5148\u4fdd\u5b58\u4e0b\u4e00\u4e2a\u8282\u70b9\n            int i = indexFor(e.hash, newCapacity);\n            e.next = newTable&#91;i];    \/\/ (2) \u5934\u63d2\u6cd5\uff1a\u5c06e\u7684next\u6307\u5411\u65b0\u8868\u7684\u8868\u5934\n            newTable&#91;i] = e;         \/\/ (3) \u5c06e\u653e\u5230\u65b0\u8868\u7684\u8868\u5934\n            e = next;                \/\/ (4) \u5904\u7406\u4e0b\u4e00\u4e2a\u8282\u70b9\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u8be5\u65b9\u6cd5\u4f1a\u4f7f\u7528\u5934\u63d2\u6cd5\u5bf9\u94fe\u8868\u8fdb\u884c\u62f7\u8d1d\uff0c\u4f1a\u5c06\u94fe\u8868\u53cd\u5e8f\uff0c\u6b63\u5e38\u5355\u7ebf\u7a0b\u64cd\u4f5c\u4e0b\uff0c\u8fd9\u4e2a\u64cd\u4f5c\u662f\u6ca1\u6709\u95ee\u9898\u7684\uff0c\u4f46\u662f\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u4f1a\u51fa\u73b0\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>\u5047\u8bbe\u6570\u7ec4\u7684\u5927\u5c0f\u4e3a10\u4e2a\u6876\uff0c\u73b0\u5728\u5df2\u7ecf\u88c5\u4e869\u4e2a\uff0c\u7ebf\u7a0b\u4e00\u548c\u7ebf\u7a0b\u4e8c\u540c\u65f6\u8fdb\u884cput\u64cd\u4f5c\uff0c\u89e6\u53d1hashmap\u7684\u6269\u5bb9\u673a\u5236\uff0c\u8c03\u7528transfer\u65b9\u6cd5\uff0c\u5047\u8bbe\u7ebf\u7a0b\u4e00\u6b63\u5e38\u8fdb\u884cput<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/mofan.help\/wp-content\/uploads\/2026\/08\/image-1.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"969\" height=\"474\" data-original=\"https:\/\/mofan.help\/wp-content\/uploads\/2026\/08\/image-1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-268\"  sizes=\"(max-width: 969px) 100vw, 969px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/mofan.help\/wp-content\/uploads\/2026\/08\/image.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"874\" height=\"234\" data-original=\"https:\/\/mofan.help\/wp-content\/uploads\/2026\/08\/image.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-267\"  sizes=\"(max-width: 874px) 100vw, 874px\" \/><\/div><\/figure>\n\n\n\n<p>\u7ebf\u7a0b\u4e00\u5c061\u53f7\u6876\u7684\u94fe\u8868\u5012\u5e8f<\/p>\n\n\n\n<p>\u6b64\u65f6\u7ebf\u7a0b\u4e8c\u4e5f\u8981\u8c03\u7528transfer\u65b9\u6cd5\uff0c\u4f46\u662f\u5462\u7531\u4e8e\u7ebf\u7a0b\u4e00\u7684\u64cd\u4f5c\u4f7f\u5f97B.next == A\uff0c\u5728\u7528\u5934\u63d2\u6cd5\u5bf9A\u8282\u70b9\u8fdb\u884c\u63d2\u5165\u65f6\uff0c\u4f1a\u5bfc\u81f4A.next\u6307\u5411B\uff0c\u4ece\u800c\u5f62\u6210\u73af\u5f62\u94fe\u8868\uff0c\u5bfc\u81f4\u6b7b\u5faa\u73af\uff0c\u5728\u904d\u5386\u65f6\u5360\u6ee1CPU<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/mofan.help\/wp-content\/uploads\/2026\/08\/image-2.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"597\" height=\"276\" data-original=\"https:\/\/mofan.help\/wp-content\/uploads\/2026\/08\/image-2.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-269\"  sizes=\"(max-width: 597px) 100vw, 597px\" \/><\/div><\/figure>\n\n\n\n<p>\u8be5\u95ee\u9898\u5728JDK8\u4e4b\u540e\u6539\u7528\u5c3e\u63d2\u6cd5\u540e\u5f97\u5230\u89e3\u51b3\uff0c\u5982\u679c\u4f7f\u7528\u5c3e\u63d2\u6cd5\u4fbf\u4e0d\u4f1a\u6539\u53d8\u94fe\u8868\u7684\u987a\u5e8f\uff0c\u5373\u4f7f\u7ebf\u7a0b\u4e00\u5df2\u7ecf\u5b8c\u6210\u4e86\u64cd\u4f5c\uff0c\u6709\u5e8f\u94fe\u8868\u7684\u987a\u5e8f\u4e0d\u53d8\uff0c\u6545\u5bf9\u7ebf\u7a0b\u4e8c\u7684\u64cd\u4f5c\u6ca1\u6709\u5f71\u54cd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728JDK7\u4e4b\u524d\u4f7f\u7528HashMap\u7684\u65f6\u5019\uff0c\u5982\u679c\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u4f1a\u5bfc\u81f4\u96c6\u5408\u5728\u6269\u5bb9\u7684\u65f6\u5019\u5f62\u6210\u73af\u5f62\u94fe\u8868\uff0c\u51fa\u73b0\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-266","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/mofan.help\/index.php\/wp-json\/wp\/v2\/posts\/266"}],"collection":[{"href":"https:\/\/mofan.help\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mofan.help\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mofan.help\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mofan.help\/index.php\/wp-json\/wp\/v2\/comments?post=266"}],"version-history":[{"count":1,"href":"https:\/\/mofan.help\/index.php\/wp-json\/wp\/v2\/posts\/266\/revisions"}],"predecessor-version":[{"id":270,"href":"https:\/\/mofan.help\/index.php\/wp-json\/wp\/v2\/posts\/266\/revisions\/270"}],"wp:attachment":[{"href":"https:\/\/mofan.help\/index.php\/wp-json\/wp\/v2\/media?parent=266"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mofan.help\/index.php\/wp-json\/wp\/v2\/categories?post=266"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mofan.help\/index.php\/wp-json\/wp\/v2\/tags?post=266"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}