{"id":37243,"date":"2023-12-11T14:40:45","date_gmt":"2023-12-11T06:40:45","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=37243"},"modified":"2023-12-11T14:40:45","modified_gmt":"2023-12-11T06:40:45","slug":"hashcode-%e4%b8%8e-equals-%ef%bc%9f%e4%b8%ba%e4%bb%80%e4%b9%88%e9%87%8d%e5%86%99equals%e6%97%b6%e5%bf%85%e9%a1%bb%e9%87%8d%e5%86%99hashcode%e6%96%b9%e6%b3%95%ef%bc%9f%e9%87%8d%e8%a6%81","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/hashcode-%e4%b8%8e-equals-%ef%bc%9f%e4%b8%ba%e4%bb%80%e4%b9%88%e9%87%8d%e5%86%99equals%e6%97%b6%e5%bf%85%e9%a1%bb%e9%87%8d%e5%86%99hashcode%e6%96%b9%e6%b3%95%ef%bc%9f%e9%87%8d%e8%a6%81\/","title":{"rendered":"hashCode \u4e0e equals \uff1f\u4e3a\u4ec0\u4e48\u91cd\u5199equals\u65f6\u5fc5\u987b\u91cd\u5199hashCode\u65b9\u6cd5\uff1f\u91cd\u8981"},"content":{"rendered":"

“`” \u9762\u8bd5\u5b98\u53ef\u80fd\u4f1a\u95ee\u4f60\uff1a\u201c\u4f60\u91cd\u5199\u8fc7 hashcode \u548c equals \u4e48\uff0c\u4e3a\u4ec0\u4e48\u91cd\u5199equals\u65f6\u5fc5\u987b\u91cd\u5199hashCode\u65b9\u6cd5\uff1f\u201d<\/p>\n

<h3>hashCode\uff08\uff09\u4ecb\u7ecd<\/h3><\/p>\n

hashCode() \u7684\u4f5c\u7528\u662f\u83b7\u53d6\u54c8\u5e0c\u7801\uff0c\u4e5f\u79f0\u4e3a\u6563\u5217\u7801\uff1b\u5b83\u5b9e\u9645\u4e0a\u662f\u8fd4\u56de\u4e00\u4e2aint\u6574\u6570\u3002\u8fd9\u4e2a\u54c8\u5e0c\u7801\u7684\u4f5c\u7528\u662f\u786e\u5b9a\u8be5\u5bf9\u8c61\u5728\u54c8\u5e0c\u8868\u4e2d\u7684\u7d22\u5f15\u4f4d\u7f6e\u3002hashCode() \u5b9a\u4e49\u5728JDK\u7684Object.java\u4e2d\uff0c\u8fd9\u5c31\u610f\u5473\u7740Java\u4e2d\u7684\u4efb\u4f55\u7c7b\u90fd\u5305\u542b\u6709hashCode() \u51fd\u6570\u3002<\/p>\n

\u6563\u5217\u8868\u5b58\u50a8\u7684\u662f\u952e\u503c\u5bf9(key-value)\uff0c\u5b83\u7684\u7279\u70b9\u662f\uff1a\u80fd\u6839\u636e\u201c\u952e\u201d\u5feb\u901f\u7684\u68c0\u7d22\u51fa\u5bf9\u5e94\u7684\u201c\u503c\u201d\u3002\u8fd9\u5176\u4e2d\u5c31\u5229\u7528\u5230\u4e86\u6563\u5217\u7801\uff01\uff08\u53ef\u4ee5\u5feb\u901f\u627e\u5230\u6240\u9700\u8981\u7684\u5bf9\u8c61\uff09<\/p>\n

<h3>\u4e3a\u4ec0\u4e48\u8981\u6709 hashCode<\/h3><\/p>\n

<strong>\u6211\u4eec\u5148\u4ee5\u201cHashSet \u5982\u4f55\u68c0\u67e5\u91cd\u590d\u201d\u4e3a\u4f8b\u5b50\u6765\u8bf4\u660e\u4e3a\u4ec0\u4e48\u8981\u6709 hashCode\uff1a<\/strong> \u5f53\u4f60\u628a\u5bf9\u8c61\u52a0\u5165 HashSet \u65f6\uff0cHashSet \u4f1a\u5148\u8ba1\u7b97\u5bf9\u8c61\u7684 hashcode \u503c\u6765\u5224\u65ad\u5bf9\u8c61\u52a0\u5165\u7684\u4f4d\u7f6e\uff0c\u540c\u65f6\u4e5f\u4f1a\u4e0e\u5176\u4ed6\u5df2\u7ecf\u52a0\u5165\u7684\u5bf9\u8c61\u7684 hashcode \u503c\u4f5c\u6bd4\u8f83\uff0c\u5982\u679c\u6ca1\u6709\u76f8\u7b26\u7684hashcode\uff0cHashSet\u4f1a\u5047\u8bbe\u5bf9\u8c61\u6ca1\u6709\u91cd\u590d\u51fa\u73b0\u3002\u4f46\u662f\u5982\u679c\u53d1\u73b0\u6709\u76f8\u540c hashcode \u503c\u7684\u5bf9\u8c61\uff0c\u8fd9\u65f6\u4f1a\u8c03\u7528 <code>equals()<\/code>\u65b9\u6cd5\u6765\u68c0\u67e5 hashcode \u76f8\u7b49\u7684\u5bf9\u8c61\u662f\u5426\u771f\u7684\u76f8\u540c\u3002\u5982\u679c\u4e24\u8005\u76f8\u540c\uff0cHashSet \u5c31\u4e0d\u4f1a\u8ba9\u5176\u52a0\u5165\u64cd\u4f5c\u6210\u529f\u3002\u5982\u679c\u4e0d\u540c\u7684\u8bdd\uff0c\u5c31\u4f1a\u91cd\u65b0\u6563\u5217\u5230\u5176\u4ed6\u4f4d\u7f6e\u3002\uff08\u6458\u81ea\u6211\u7684Java\u542f\u8499\u4e66\u300aHead first java\u300b\u7b2c\u4e8c\u7248\uff09\u3002\u8fd9\u6837\u6211\u4eec\u5c31\u5927\u5927\u51cf\u5c11\u4e86 equals \u7684\u6b21\u6570\uff0c\u76f8\u5e94\u5c31\u5927\u5927\u63d0\u9ad8\u4e86\u6267\u884c\u901f\u5ea6\u3002<\/p>\n

\u901a\u8fc7\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff1a<code>hashCode()<\/code> \u7684\u4f5c\u7528\u5c31\u662f<strong>\u83b7\u53d6\u54c8\u5e0c\u7801<\/strong>\uff0c\u4e5f\u79f0\u4e3a\u6563\u5217\u7801\uff1b\u5b83\u5b9e\u9645\u4e0a\u662f\u8fd4\u56de\u4e00\u4e2aint\u6574\u6570\u3002\u8fd9\u4e2a<strong>\u54c8\u5e0c\u7801\u7684\u4f5c\u7528<\/strong>\u662f\u786e\u5b9a\u8be5\u5bf9\u8c61\u5728\u54c8\u5e0c\u8868\u4e2d\u7684\u7d22\u5f15\u4f4d\u7f6e\u3002<strong><code>hashCode() <\/code>\u5728\u6563\u5217\u8868\u4e2d\u624d\u6709\u7528\uff0c\u5728\u5176\u5b83\u60c5\u51b5\u4e0b\u6ca1\u7528<\/strong>\u3002\u5728\u6563\u5217\u8868\u4e2dhashCode() \u7684\u4f5c\u7528\u662f\u83b7\u53d6\u5bf9\u8c61\u7684\u6563\u5217\u7801\uff0c\u8fdb\u800c\u786e\u5b9a\u8be5\u5bf9\u8c61\u5728\u6563\u5217\u8868\u4e2d\u7684\u4f4d\u7f6e\u3002<\/p>\n

<h3>hashCode\uff08\uff09\u4e0eequals\uff08\uff09\u7684\u76f8\u5173\u89c4\u5b9a<\/h3><\/p>\n

<ol><li>\u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49\uff0c\u5219hashcode\u4e00\u5b9a\u4e5f\u662f\u76f8\u540c\u7684<\/li><li>\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49,\u5bf9\u4e24\u4e2a\u5bf9\u8c61\u5206\u522b\u8c03\u7528equals\u65b9\u6cd5\u90fd\u8fd4\u56detrue<\/li><li>\u4e24\u4e2a\u5bf9\u8c61\u6709\u76f8\u540c\u7684hashcode\u503c\uff0c\u5b83\u4eec\u4e5f\u4e0d\u4e00\u5b9a\u662f\u76f8\u7b49\u7684<\/li><li><strong>\u56e0\u6b64\uff0cequals \u65b9\u6cd5\u88ab\u8986\u76d6\u8fc7\uff0c\u5219 hashCode \u65b9\u6cd5\u4e5f\u5fc5\u987b\u88ab\u8986\u76d6<\/strong><\/li><li>hashCode() \u7684\u9ed8\u8ba4\u884c\u4e3a\u662f\u5bf9\u5806\u4e0a\u7684\u5bf9\u8c61\u4ea7\u751f\u72ec\u7279\u503c\u3002\u5982\u679c\u6ca1\u6709\u91cd\u5199 hashCode()\uff0c\u5219\u8be5 class \u7684\u4e24\u4e2a\u5bf9\u8c61\u65e0\u8bba\u5982\u4f55\u90fd\u4e0d\u4f1a\u76f8\u7b49\uff08\u5373\u4f7f\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u6307\u5411\u76f8\u540c\u7684\u6570\u636e\uff09<\/li><\/ol><\/p>\n

<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"

“`” \u9762\u8bd5\u5b98\u53ef\u80fd\u4f1a\u95ee\u4f60\uff1a\u201c\u4f60\u91cd\u5199\u8fc7 hashcode \u548c equals \u4e48\uff0c\u4e3a\u4ec0\u4e48\u91cd […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-37243","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37243","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\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=37243"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37243\/revisions"}],"predecessor-version":[{"id":37244,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37243\/revisions\/37244"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=37243"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=37243"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=37243"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}