1\u3001 HashMap \u6982\u8ff0\uff1a HashMap \u662f\u57fa\u4e8e\u54c8\u5e0c\u8868\u7684 Map \u63a5\u53e3\u7684\u975e\u540c\u6b65\u5b9e\u73b0\u3002\u6b64\u5b9e\u73b0\u63d0\u4f9b\u6240\u6709\u53ef\u9009\u7684\u6620\u5c04\u64cd\u4f5c\uff0c\u5e76\u5141\u8bb8\u4f7f\u7528 null \u503c\u548c null \u952e\u3002\u6b64\u7c7b\u4e0d\u4fdd\u8bc1\u6620\u5c04\u7684\u987a\u5e8f\uff0c\u7279\u522b\u662f\u5b83\u4e0d\u4fdd\u8bc1\u8be5\u987a\u5e8f\u6052\u4e45\u4e0d\u53d8\u3002
\n2\u3001 HashMap \u7684\u6570\u636e\u7ed3\u6784\uff1a\u5728 Java \u7f16\u7a0b\u8bed\u8a00\u4e2d\uff0c\u6700\u57fa\u672c\u7684\u7ed3\u6784\u5c31\u662f\u4e24\u79cd\uff0c\u4e00\u4e2a\u662f\u6570\u7ec4\uff0c\u53e6\u5916\u4e00\u4e2a\u662f\u6a21\u62df\u6307\u9488\uff08\u5f15\u7528\uff09\uff0c\u6240\u6709\u7684\u6570\u636e\u7ed3\u6784\u90fd\u53ef\u4ee5\u7528\u8fd9\u4e24\u4e2a\u57fa\u672c\u7ed3\u6784\u6765\u6784\u9020\u7684\uff0cHashMap \u4e5f\u4e0d\u4f8b\u5916\u3002HashMap \u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u201c\u94fe\u8868\u6563\u5217\u201d\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5373\u6570\u7ec4\u548c\u94fe\u8868\u7684\u7ed3\u5408\u4f53\u3002
\nHashMap \u57fa\u4e8e Hash \u7b97\u6cd5\u5b9e\u73b0\u7684
\n1\u3001\u5f53\u6211\u4eec\u5f80 HashMap \u4e2d put \u5143\u7d20\u65f6\uff0c\u5229\u7528 key \u7684 hashCode \u91cd\u65b0 hash \u8ba1\u7b97\u51fa\u5f53\u524d\u5bf9\u8c61\u7684\u5143\u7d20\u5728\u6570\u7ec4\u4e2d\u7684\u4e0b\u6807
\n2\u3001\u5b58\u50a8\u65f6\uff0c\u5982\u679c\u51fa\u73b0 hash \u503c\u76f8\u540c\u7684 key\uff0c\u6b64\u65f6\u6709\u4e24\u79cd\u60c5\u51b5\u3002
\n\u5982\u679c key \u76f8\u540c\uff0c\u5219\u8986\u76d6\u539f\u59cb\u503c\uff1b
\n\u5982\u679c key \u4e0d\u540c\uff08\u51fa\u73b0\u51b2\u7a81\uff09\uff0c\u5219\u5c06\u5f53\u524d\u7684 key-value \u653e\u5165\u94fe\u8868\u4e2d
\n3\u3001\u83b7\u53d6\u65f6\uff0c\u76f4\u63a5\u627e\u5230 hash \u503c\u5bf9\u5e94\u7684\u4e0b\u6807\uff0c\u5728\u8fdb\u4e00\u6b65\u5224\u65ad key \u662f\u5426\u76f8\u540c\uff0c\u4ece\u800c\u627e\u5230\u5bf9\u5e94\u503c\u3002
\n4\u3001\u7406\u89e3\u4e86\u4ee5\u4e0a\u8fc7\u7a0b\u5c31\u4e0d\u96be\u660e\u767d HashMap \u662f\u5982\u4f55\u89e3\u51b3 hash \u51b2\u7a81\u7684\u95ee\u9898\uff0c\u6838\u5fc3\u5c31\u662f\u4f7f\u7528\u4e86\u6570\u7ec4\u7684\u5b58\u50a8\u65b9\u5f0f\uff0c\u7136\u540e\u5c06\u51b2\u7a81\u7684 key \u7684\u5bf9\u8c61\u653e\u5165\u94fe\u8868\u4e2d\uff0c\u4e00\u65e6\u53d1\u73b0\u51b2\u7a81\u5c31\u5728\u94fe\u8868\u4e2d\u505a\u8fdb\u4e00\u6b65\u7684\u5bf9\u6bd4\u3002
\n\u9700\u8981\u6ce8\u610f Jdk 1.8 \u4e2d\u5bf9 HashMap \u7684\u5b9e\u73b0\u505a\u4e86\u4f18\u5316\uff0c\u5f53\u94fe\u8868\u4e2d\u7684\u8282\u70b9\u6570\u636e\u8d85\u8fc7\u516b\u4e2a\u4e4b\u540e\uff0c\u8be5\u94fe\u8868\u4f1a\u8f6c\u4e3a\u7ea2\u9ed1\u6811\u6765\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff0c\u4ece\u539f\u6765\u7684 O(n)\u5230 O(logn)<\/p>\n","protected":false},"excerpt":{"rendered":"
1\u3001 HashMap \u6982\u8ff0\uff1a HashMap \u662f\u57fa\u4e8e\u54c8\u5e0c\u8868\u7684 Map \u63a5\u53e3\u7684\u975e\u540c\u6b65\u5b9e\u73b0\u3002\u6b64\u5b9e\u73b0\u63d0\u4f9b\u6240\u6709\u53ef\u9009\u7684\u6620 […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[99],"tags":[],"class_list":["post-10498","post","type-post","status-publish","format-standard","hentry","category-javabase"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10498","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\/8"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=10498"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10498\/revisions"}],"predecessor-version":[{"id":10500,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10498\/revisions\/10500"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=10498"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=10498"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=10498"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}