{"id":31698,"date":"2023-07-18T15:28:48","date_gmt":"2023-09-11T12:44:21","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%e8%a6%86%e5%86%99hashcode%e6%96%b9%e6%b3%95\/"},"modified":"2024-04-30T14:11:53","modified_gmt":"2024-04-30T06:11:53","slug":"%e5%9c%a8java%e4%b8%ad%e8%a6%86%e5%86%99hashcode%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%e8%a6%86%e5%86%99hashcode%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u5728Java\u4e2d\u8986\u5199hashCode()\u65b9\u6cd5"},"content":{"rendered":"

\u5373\u4f7f\u91cd\u5199\u4e86equals()\u65b9\u6cd5\uff0c\u4e5f\u65e0\u6cd5\u5728HashSet\u4e2d\u4f7f\u7528remove()\u51fd\u6570\u3002<\/h2>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n

\u91cd\u5199hashCode()\u65b9\u6cd5<\/h1>\n

\u25aa\ufe0fTest54.java\u7684\u5185\u90e8\u6587\u4ef6<\/p>\n

import<\/span> java.util.*<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Test54<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        Set<\/span><<\/span>Hero54<\/span>><\/span> list<\/span> =<\/span> new<\/span> HashSet<\/span><<\/span>Hero54<\/span>>();<\/span>\r\n        Hero54<\/span> h1<\/span> =<\/span> new<\/span> Hero54<\/span>();<\/span>\r\n        h1<\/span>.<\/span>name<\/span> =<\/span> \"\u30df\u30ca\u30c8\"<\/span>;<\/span>\r\n        list<\/span>.<\/span>add<\/span>(<\/span>h1<\/span>);<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u8981\u7d20\u6570\uff1d\"<\/span> +<\/span> list<\/span>.<\/span>size<\/span>());<\/span>\r\n        h1<\/span> =<\/span> new<\/span> Hero54<\/span>();<\/span>\r\n        h1<\/span>.<\/span>name<\/span> =<\/span> \"\u30df\u30ca\u30c8\"<\/span>;<\/span>\r\n        list<\/span>.<\/span>remove<\/span>(<\/span>h1<\/span>);<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u8981\u7d20\u6570\uff1d\"<\/span> +<\/span> list<\/span>.<\/span>size<\/span>());<\/span>\r\n    }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u25aa\ufe0f\u82f1\u96c454.java<\/p>\n
import<\/span> java.util.*<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Hero54<\/span> {<\/span>\r\n\r\n    private<\/span> int<\/span> hp<\/span>;<\/span>\r\n    public<\/span> String<\/span> name<\/span>;<\/span>\r\n\r\n    public<\/span> boolean<\/span> equals<\/span>(<\/span>Object<\/span> o<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>o<\/span> ==<\/span> this<\/span>)<\/span>\r\n            return<\/span> true<\/span>;<\/span>\r\n        if<\/span> (<\/span>o<\/span> ==<\/span> null<\/span>)<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n        if<\/span> (!(<\/span>o<\/span> instanceof<\/span> Hero54<\/span>))<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n        Hero54<\/span> r<\/span> =<\/span> (<\/span>Hero54<\/span>)<\/span> o<\/span>;<\/span>\r\n        if<\/span> (!<\/span>this<\/span>.<\/span>name<\/span>.<\/span>trim<\/span>().<\/span>equals<\/span>(<\/span>r<\/span>.<\/span>name<\/span>.<\/span>trim<\/span>()))<\/span> {<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n        }<\/span>\r\n        return<\/span> true<\/span>;<\/span>\r\n\r\n    }<\/span>\r\n\r\n    public<\/span> int<\/span> hashCode<\/span>()<\/span> {<\/span>\r\n        int<\/span> result<\/span> =<\/span> 37<\/span>;<\/span>\r\n        result<\/span> =<\/span> result<\/span> *<\/span> 31<\/span> +<\/span> name<\/span>.<\/span>hashCode<\/span>();<\/span>\r\n        result<\/span> =<\/span> result<\/span> *<\/span> 31<\/span> +<\/span> hp<\/span>;<\/span>\r\n        return<\/span> result<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u25aa\ufe0fTest54.java \u6267\u884c\u7ed3\u679c
\n\u5143\u7d20\u6570\u91cf\uff1d1
\n\u5143\u7d20\u6570\u91cf\uff1d0<\/p>\n
\u5728\u8986\u5199hashCode()\u4e4b\u524d<\/h1>\n
\u82f1\u96c454.java<\/p>\n
import<\/span> java.util.*<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Hero54<\/span> {<\/span>\r\n\r\n    private<\/span> int<\/span> hp<\/span>;<\/span>\r\n    public<\/span> String<\/span> name<\/span>;<\/span>\r\n\r\n    public<\/span> boolean<\/span> equals<\/span>(<\/span>Object<\/span> o<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>o<\/span> ==<\/span> this<\/span>)<\/span>\r\n            return<\/span> true<\/span>;<\/span>\r\n        if<\/span> (<\/span>o<\/span> ==<\/span> null<\/span>)<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n        if<\/span> (!(<\/span>o<\/span> instanceof<\/span> Hero54<\/span>))<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n        Hero54<\/span> r<\/span> =<\/span> (<\/span>Hero54<\/span>)<\/span> o<\/span>;<\/span>\r\n        if<\/span> (!<\/span>this<\/span>.<\/span>name<\/span>.<\/span>trim<\/span>().<\/span>equals<\/span>(<\/span>r<\/span>.<\/span>name<\/span>.<\/span>trim<\/span>()))<\/span> {<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n        }<\/span>\r\n        return<\/span> true<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Test54.java \u6267\u884c\u7ed3\u679c
\n\u5143\u7d20\u6570\u91cf\uff1d1
\n\u5143\u7d20\u6570\u91cf\uff1d1<\/p>\n
HashSet \u662f\u4e00\u4e2a\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\u7684\u6570\u636e\u7ed3\u6784:
\n– \u4e0d\u5141\u8bb8\u91cd\u590d\u5143\u7d20
\n– \u57fa\u672c\u4e0a\u6ca1\u6709\u987a\u5e8f\u5173\u7cfb<\/p>\n
\n
hashCode()\u7684\u91cd\u5199\u793a\u4f8b\u2461<\/h1>\n
\u25aa\ufe0fTest55.java\u8986\u76d6\u4e86hashCode()\u7684\u4f8b\u5b502\u3002<\/p>\n
import<\/span> java.util.*<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Test55<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        Set<\/span><<\/span>Cat55<\/span>><\/span> cat<\/span> =<\/span> new<\/span> HashSet<\/span><<\/span>Cat55<\/span>>();<\/span>\r\n        Cat55<\/span> c1<\/span> =<\/span> new<\/span> Cat55<\/span>();<\/span>\r\n        c1<\/span>.<\/span>name<\/span> =<\/span> \"\u306d\u3053\"<\/span>;<\/span>\r\n        Cat55<\/span> c2<\/span> =<\/span> new<\/span> Cat55<\/span>();<\/span>\r\n        c2<\/span>.<\/span>name<\/span> =<\/span> \"\u306d\u3053\uff12\"<\/span>;<\/span>\r\n        Cat55<\/span> c3<\/span> =<\/span> new<\/span> Cat55<\/span>();<\/span>\r\n        c3<\/span>.<\/span>name<\/span> =<\/span> \"\u306d\u3053\uff13\"<\/span>;<\/span>\r\n        cat<\/span>.<\/span>add<\/span>(<\/span>c1<\/span>);<\/span>\r\n        cat<\/span>.<\/span>add<\/span>(<\/span>c2<\/span>);<\/span>\r\n        cat<\/span>.<\/span>add<\/span>(<\/span>c3<\/span>);<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>c1<\/span>);<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>cat<\/span>.<\/span>size<\/span>());<\/span>\r\n        cat<\/span>.<\/span>remove<\/span>(<\/span>c2<\/span>);<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>cat<\/span>.<\/span>size<\/span>());<\/span>\r\n\r\n    }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u25aa\ufe0fCat55.java\u7684hashCode()\u65b9\u6cd5\u91cd\u5199\u793a\u4f8b\u4e8c<\/p>\n
public<\/span> class<\/span> Cat55<\/span> {<\/span>\r\n    private<\/span> int<\/span> cp<\/span>;<\/span>\r\n    public<\/span> String<\/span> name<\/span>;<\/span>\r\n\r\n    public<\/span> boolean<\/span> equals<\/span>(<\/span>Object<\/span> o<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>o<\/span> ==<\/span> this<\/span>)<\/span>\r\n            return<\/span> true<\/span>;<\/span>\r\n        if<\/span> (<\/span>o<\/span> ==<\/span> null<\/span>)<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n        if<\/span> (!(<\/span>o<\/span> instanceof<\/span> Cat55<\/span>))<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n        Cat55<\/span> f<\/span> =<\/span> (<\/span>Cat55<\/span>)<\/span> o<\/span>;<\/span>\r\n        if<\/span> (!<\/span>this<\/span>.<\/span>name<\/span>.<\/span>trim<\/span>().<\/span>equals<\/span>(<\/span>f<\/span>.<\/span>name<\/span>.<\/span>trim<\/span>()))<\/span> {<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n        }<\/span>\r\n        return<\/span> true<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> int<\/span> hashCode<\/span>()<\/span> {<\/span>\r\n        int<\/span> catResult<\/span> =<\/span> 13<\/span>;<\/span>\r\n        catResult<\/span> =<\/span> catResult<\/span> *<\/span> 31<\/span> +<\/span> name<\/span>.<\/span>hashCode<\/span>();<\/span>\r\n        catResult<\/span> =<\/span> catResult<\/span> *<\/span> 31<\/span> +<\/span> cp<\/span>;<\/span>\r\n        return<\/span> catResult<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5176\u5b9e\u5c31\u662f\u53ea\u8981hashCode\u76f8\u540c\uff0cequals\u8fd4\u56detrue\u7684\u5bf9\u8c61\u5c31\u88ab\u89c6\u4e3a\u76f8\u540c\u7684\u3002\u5982\u679chashCode\u4e0d\u76f8\u540c\uff0cequals\u6839\u672c\u4e0d\u4f1a\u88ab\u8bc4\u4f30\u3002<\/p>\n
\u25aa\ufe0fTest55.java hashCode()\u65b9\u6cd5\u8986\u76d6\u793a\u4f8b2 \u6267\u884c\u7ed3\u679c
\nCat55@bbd407
\n3
\n2<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u7a2e\u53ef\u80fd\u7684\u6f22\u8a9e\u7ffb\u8b6f\uff1a
\n\u25aa\ufe0f \u88dc\u5145
\nCat55.java \u7684\u542b\u7fa9\u662f<\/p>\n
public<\/span> class<\/span> Cat55<\/span> {<\/span>\r\n    public<\/span> int<\/span> cp<\/span>;<\/span>\r\n    public<\/span> String<\/span> name<\/span>;<\/span>\r\n\r\n    public<\/span> boolean<\/span> equals<\/span>(<\/span>Object<\/span> o<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>this<\/span>.<\/span>name<\/span> ==<\/span> o<\/span>)<\/span> {<\/span>\r\n            return<\/span> true<\/span>;<\/span>\r\n        }<\/span>\r\n        return<\/span> false<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> int<\/span> hashCode<\/span>()<\/span> {<\/span>\r\n        int<\/span> catResult<\/span> =<\/span> 13<\/span>;<\/span>\r\n        catResult<\/span> =<\/span> catResult<\/span> *<\/span> 31<\/span> +<\/span> name<\/span>.<\/span>hashCode<\/span>();<\/span>\r\n        catResult<\/span> =<\/span> catResult<\/span> *<\/span> 31<\/span> +<\/span> cp<\/span>;<\/span>\r\n        return<\/span> catResult<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u65e0\u8bba\u5982\u4f55\uff0c\u7ed3\u679c\u90fd\u662f\u4e00\u6837\u7684<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5373\u4f7f\u91cd\u5199\u4e86equals()\u65b9\u6cd5\uff0c\u4e5f\u65e0\u6cd5\u5728HashSet\u4e2d\u4f7f\u7528remove()\u51fd\u6570\u3002 \u91cd\u5199hashCode()\u65b9 […]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31698","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u5728Java\u4e2d\u8986\u5199hashCode()\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728java\u4e2d\u8986\u5199hashcode\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5728Java\u4e2d\u8986\u5199hashCode()\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"\u5373\u4f7f\u91cd\u5199\u4e86equals()\u65b9\u6cd5\uff0c\u4e5f\u65e0\u6cd5\u5728HashSet\u4e2d\u4f7f\u7528remove()\u51fd\u6570\u3002 \u91cd\u5199hashCode()\u65b9 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728java\u4e2d\u8986\u5199hashcode\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-09-11T12:44:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-30T06:11:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0e2e37434c4406bec75b\/1-0.png\" \/>\n<meta name=\"author\" content=\"\u6e05, \u626c\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u6e05, \u626c\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%e8%a6%86%e5%86%99hashcode%e6%96%b9%e6%b3%95\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%e8%a6%86%e5%86%99hashcode%e6%96%b9%e6%b3%95\/\",\"name\":\"\u5728Java\u4e2d\u8986\u5199hashCode()\u65b9\u6cd5 - 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