{"id":350,"date":"2025-07-01T15:31:09","date_gmt":"2025-07-01T07:31:09","guid":{"rendered":"http:\/\/getzs.online\/?p=350"},"modified":"2025-07-01T15:39:57","modified_gmt":"2025-07-01T07:39:57","slug":"hashmap%e9%9d%a2%e8%af%95%e9%a2%98","status":"publish","type":"post","link":"https:\/\/hello.getzs.online\/index.php\/2025\/07\/01\/hashmap%e9%9d%a2%e8%af%95%e9%a2%98\/","title":{"rendered":"HashMap\u9762\u8bd5\u9898"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">1.\u8bb2\u4e0b\u5bf9HashMap\u7684\u8ba4\u8bc6<\/h3>\n\n\n\n<p>HashMap\u7684\u5e95\u5c42\u662f\u6570\u7ec4+\u94fe\u8868+\u7ea2\u9ed1\u6811<\/p>\n\n\n\n<p>\u5b58\u50a8\u7684\u662f\u952e\u503c\u5bf9\uff08key-value\uff09\u5173\u7cfb\uff0c\u91c7\u7528\u94fe\u8868\u6cd5\u5904\u7406\u54c8\u5e0c\u51b2\u7a81<\/p>\n\n\n\n<p>\u5c5e\u4e8e\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5728\u591a\u7ebf\u7a0b\u4e2d\u53ef\u4ee5\u4f7f\u7528HashTable\u3001ConcurrentHashMap\u66ff\u4ee3<\/p>\n\n\n\n<div style=\"height:33px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">2.\u4e3a\u4ec0\u4e48HashMap\u7684\u957f\u5ea6\u5fc5\u987b\u662f2\u7684n\u6b21\u5e42\uff1f<\/h3>\n\n\n\n<p>\u5728\u8ba1\u7b97\u5b58\u50a8\u6570\u7ec4\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u9700\u8981\u7528key\u7684\u54c8\u5e0c\u503c\u8fdb\u884c\u53d6\u4f59\u64cd\u4f5c\uff0c\u7531\u4e8e\u8ba1\u7b97\u673a\u6ca1\u6709\u53d6\u4f59\u7684\u8fd0\u7b97\uff0c\u4f1a\u88ab\u8f6c\u6362\u4e3a\u5176\u4ed6\u7684\u64cd\u4f5c\u8fd0\u7b97\uff0c\u63d0\u9ad8\u4e86\u590d\u6742\u5ea6\u3002\u800c\u5f53HashMap\u957f\u5ea6\u4e3a2\u7684n\u6b21\u5e42\uff0c\u4f1a\u6ee1\u8db3\u516c\u5f0f\uff08n-1) &amp; hash == hash % n\uff0c\u5c31\u53ef\u4ee5\u7528\u4f4d\u8fd0\u7b97\u53d6\u4ee3\u4f59\u8fd0\u7b97\uff0c\u8ba1\u7b97\u66f4\u9ad8\u6548\u3002<\/p>\n\n\n\n<div style=\"height:33px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">3.HashMap \u4e3a\u4ec0\u4e48\u5728\u83b7\u53d6 hash \u503c\u65f6\u8981\u8fdb\u884c\u4f4d\u8fd0\u7b97<\/h3>\n\n\n\n<div style=\"height:33px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">4.HashMap\u5728JDK1.7\u548cJDK1.8\u4e2d\u6709\u54ea\u4e9b\u4e0d\u540c\uff1f HashMap\u7684\u5e95\u5c42\u5b9e\u73b0<\/h3>\n\n\n\n<div style=\"height:33px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">5.HashMap\u7684put\u65b9\u6cd5\u7684\u5177\u4f53\u6d41\u7a0b\uff1f<\/h3>\n\n\n\n<div style=\"height:33px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">6.HashMap \u7684 get \u65b9\u6cd5\u7684\u5177\u4f53\u6d41\u7a0b\uff1f<\/h3>\n\n\n\n<div style=\"height:33px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">7.HashMap\u7684\u6269\u5bb9\u64cd\u4f5c\u662f\u600e\u4e48\u5b9e\u73b0\u7684\uff1f<\/h3>\n\n\n\n<div style=\"height:33px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">8.HashMap \u5728\u6269\u5bb9\u65f6\u4e3a\u4ec0\u4e48\u901a\u8fc7\u4f4d\u8fd0\u7b97 (e.hash &amp; oldCap) \u5f97\u5230\u4e0b\u6807\uff1f<\/h3>\n\n\n\n<div style=\"height:33px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">9.\u94fe\u8868\u5347\u7ea7\u6210\u7ea2\u9ed1\u6811\u7684\u6761\u4ef6<\/h3>\n\n\n\n<div style=\"height:33px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">10.\u7ea2\u9ed1\u6811\u9000\u5316\u6210\u94fe\u8868\u7684\u6761\u4ef6<\/h3>\n\n\n\n<div style=\"height:33px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">11.HashMap\u662f\u600e\u4e48\u89e3\u51b3\u54c8\u5e0c\u51b2\u7a81\u7684\uff1f<\/h3>\n\n\n\n<div style=\"height:33px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">12.HaspMap\u7684\u521d\u59cb\u5316\u65f6\u6570\u7ec4\u957f\u5ea6\u548c\u52a0\u8f7d\u56e0\u5b50\u7684\u7ea6\u675f\u8303\u56f4<\/h3>\n","protected":false},"excerpt":{"rendered":"<p>1.\u8bb2\u4e0b\u5bf9HashMap\u7684\u8ba4\u8bc6 HashMap\u7684\u5e95\u5c42\u662f\u6570\u7ec4+\u94fe\u8868+\u7ea2\u9ed1\u6811 \u5b58\u50a8\u7684\u662f\u952e\u503c\u5bf9\uff08key-value\uff09 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-350","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts\/350","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/comments?post=350"}],"version-history":[{"count":9,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts\/350\/revisions"}],"predecessor-version":[{"id":359,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts\/350\/revisions\/359"}],"wp:attachment":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/media?parent=350"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/categories?post=350"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/tags?post=350"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}