{"id":31676,"date":"2023-09-29T03:24:19","date_gmt":"2023-05-18T23:18:41","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-hashcode-%e6%96%b9%e6%b3%95%e7%9a%84%e5%a4%87%e6%b3%a8\/"},"modified":"2024-05-04T02:01:14","modified_gmt":"2024-05-03T18:01:14","slug":"java-hashcode-%e6%96%b9%e6%b3%95%e7%9a%84%e5%a4%87%e6%b3%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-hashcode-%e6%96%b9%e6%b3%95%e7%9a%84%e5%a4%87%e6%b3%a8\/","title":{"rendered":"JAVA hashCode() \u65b9\u6cd5\u7684\u5907\u6ce8"},"content":{"rendered":"<p>\u76f8\u5f53\u56f0\u96be<br \/>\n\u4e0d\uff0c\u771f\u7684\u5f88\u96be..<br \/>\n\u25aa\ufe0fHero54.java<\/p>\n<pre class=\"post-pre\"><code>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Hero54<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kt\">int<\/span> <span class=\"n\">hp<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">boolean<\/span> <span class=\"nf\">equals<\/span><span class=\"o\">(<\/span><span class=\"nc\">Object<\/span> <span class=\"n\">o<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">o<\/span> <span class=\"o\">==<\/span> <span class=\"k\">this<\/span><span class=\"o\">)<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"kc\">true<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">o<\/span> <span class=\"o\">==<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"kc\">false<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"o\">(!(<\/span><span class=\"n\">o<\/span> <span class=\"k\">instanceof<\/span> <span class=\"nc\">Hero54<\/span><span class=\"o\">))<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"kc\">false<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"nc\">Hero54<\/span> <span class=\"n\">r<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"nc\">Hero54<\/span><span class=\"o\">)<\/span> <span class=\"n\">o<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"o\">(!<\/span><span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">name<\/span><span class=\"o\">.<\/span><span class=\"na\">trim<\/span><span class=\"o\">().<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"n\">r<\/span><span class=\"o\">.<\/span><span class=\"na\">name<\/span><span class=\"o\">.<\/span><span class=\"na\">trim<\/span><span class=\"o\">()))<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"kc\">false<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"o\">}<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"kc\">true<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">int<\/span> <span class=\"nf\">hashCode<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kt\">int<\/span> <span class=\"n\">result<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">37<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"n\">result<\/span> <span class=\"o\">=<\/span> <span class=\"n\">result<\/span> <span class=\"o\">*<\/span> <span class=\"mi\">31<\/span> <span class=\"o\">+<\/span> <span class=\"n\">name<\/span><span class=\"o\">.<\/span><span class=\"na\">hashCode<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"n\">result<\/span> <span class=\"o\">=<\/span> <span class=\"n\">result<\/span> <span class=\"o\">*<\/span> <span class=\"mi\">31<\/span> <span class=\"o\">+<\/span> <span class=\"n\">hp<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">result<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"o\">}<\/span>\r\n\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u25aa\ufe0fTest54.java \uff1a\u8bf7\u5c06\u4ee5\u4e0b\u5185\u5bb9\u539f\u751f\u5730\u7528\u4e2d\u6587\u8f6c\u8ff0\uff0c\u53ea\u9700\u7ed9\u51fa\u4e00\u79cd\u9009\u9879\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.util.*<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Test54<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">Set<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Hero54<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">list<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">HashSet<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Hero54<\/span><span class=\"o\">&gt;();<\/span>\r\n        <span class=\"nc\">Hero54<\/span> <span class=\"n\">h1<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Hero54<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"n\">h1<\/span><span class=\"o\">.<\/span><span class=\"na\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"\u30df\u30ca\u30c8\"<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"n\">list<\/span><span class=\"o\">.<\/span><span class=\"na\">add<\/span><span class=\"o\">(<\/span><span class=\"n\">h1<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">h1<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u8981\u7d20\u6570\uff1d\"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">list<\/span><span class=\"o\">.<\/span><span class=\"na\">size<\/span><span class=\"o\">());<\/span>\r\n        <span class=\"c1\">\/\/\u3053\u308c\u3092\u3084\u308b\u3053\u3068\u3067c2\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30f3\u30d0\u30fc\u5909\u6570\u304c\u5168\u90e8\u7a7a\u3063\u307d\u306b\u306a\u308a\u307e\u3059<\/span>\r\n        <span class=\"n\">h1<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Hero54<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"n\">h1<\/span><span class=\"o\">.<\/span><span class=\"na\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"\u30a2\u30b5\u30ab\"<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">h1<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">list<\/span><span class=\"o\">.<\/span><span class=\"na\">remove<\/span><span class=\"o\">(<\/span><span class=\"n\">h1<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u8981\u7d20\u6570\uff1d\"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">list<\/span><span class=\"o\">.<\/span><span class=\"na\">size<\/span><span class=\"o\">());<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u25aa\ufe0f\u6267\u884c\u7ed3\u679c<br \/>\nHero54@16f4c828<br \/>\n\u5143\u7d20\u6570\u91cf=1<br \/>\nHero54@16d8bb2d<br \/>\n\u5143\u7d20\u6570\u91cf=1<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u76f8\u5f53\u56f0\u96be \u4e0d\uff0c\u771f\u7684\u5f88\u96be.. \u25aa\ufe0fHero54.java public class Hero54 { priva [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31676","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast 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