{"id":31332,"date":"2024-02-16T04:40:50","date_gmt":"2023-09-30T02:35:10","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84equals%e6%96%b9%e6%b3%95-2\/"},"modified":"2025-08-12T23:29:16","modified_gmt":"2025-08-12T15:29:16","slug":"%e5%85%b3%e4%ba%8ejava%e7%9a%84equals%e6%96%b9%e6%b3%95-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84equals%e6%96%b9%e6%b3%95-2\/","title":{"rendered":"\u5173\u4e8eJava\u7684equals\u65b9\u6cd5"},"content":{"rendered":"

\u5728\u4eca\u5929\u7684\u5de5\u4f5c\u4e2d\uff0c\u628a\u5728\u5b9e\u65bd\u5ba1\u6838\u4e2d\u63d0\u51fa\u7684\u95ee\u9898\u8bb0\u5f55\u4e0b\u6765\u4f5c\u4e3a\u5907\u5fd8\u5f55\u3002<\/p>\n

\u6211\u89c9\u5f97\u8fd9\u5bf9\u4e8e\u7ecf\u9a8c\u8f83\u6d45\u6216\u8005\u4e3b\u8981\u5b9e\u73b0\u7684\u662f\u65e7\u7248\u672c(8\u53ca\u4ee5\u524d)\u7684\u4eba\u6765\u8bf4\u4e5f\u662f\u6709\u76ca\u7684\u3002<\/p>\n

String\u7c7b\u7684equals\u65b9\u6cd5\u3002<\/h2>\n

\u5982\u679c\u4f60\u662f\u4e00\u4e2a\u5bf9Java\u4e86\u89e3\u4e0d\u6df1\u6216\u6700\u8fd1\u5f00\u59cb\u5b66\u4e60\u7684\u4eba\uff0c\u6211\u8ba4\u4e3a\u5728\u5b66\u4e60\u5b57\u7b26\u4e32\u6bd4\u8f83\u65f6\uff0c\u5e94\u8be5\u4ee5String\u7c7b\u7684equals\u65b9\u6cd5\u4e3a\u57fa\u7840\u3002
\n(\u6211\u5728\u57f9\u8bad\u548c\u81ea\u5b66\u9636\u6bb5\u4e5f\u53ea\u5b66\u4e86\u8fd9\u4e00\u79cd\u65b9\u6cd5\uff0c\u73b0\u5728\u8fd8\u4f1a\u51fa\u4e8e\u4e60\u60ef\u4f7f\u7528\u5b83\u3002)<\/p>\n

<\/br><\/p>\n

String\u7c7b\u7684equals\u65b9\u6cd5\u53ef\u4ee5\u5224\u65ad\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\u3002
\n\u56e0\u6b64\uff0c\u5373\u4f7f\u5f15\u7528\u4e0d\u540c\uff0c\u5b83\u4e5f\u4f1a\u8fd4\u56detrue\u3002<\/p>\n

String<\/span> a<\/span> =<\/span> \"\u3042\u3044\u3046\"<\/span>;<\/span>\r\nString<\/span> b<\/span> =<\/span> \"\u3042\u3044\u3046\"<\/span>;<\/span>\r\nString<\/span> c<\/span> =<\/span> new<\/span> String<\/span>(<\/span>\"\u3042\u3044\u3046\"<\/span>);<\/span>\r\n\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>a<\/span>.<\/span>equals<\/span>(<\/span>b<\/span>));<\/span>\/\/true<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>a<\/span>.<\/span>equals<\/span>(<\/span>c<\/span>));<\/span>\/\/true<\/span>\r\n<\/code><\/pre>\n
<\/br>
<\/br><\/p>\n
\u5982\u679c\u5b58\u5728\u53ef\u80fd\u4e3anull\u7684\u60c5\u51b5\uff0c\u5219\u5fc5\u987b\u8fdb\u884cnull\u5224\u65ad\u3002<\/h3>\n
\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\uff0c\u6211\u89c9\u5f97\u9700\u8981\u975e\u5e38\u8003\u8651 null \u7684\u60c5\u51b5\u3002
\n\u5982\u679c\u53d8\u91cf\u53ef\u80fd\u4f1a\u51fa\u73b0 null \u503c\uff0c\u90a3\u4e48\u6211\u4eec\u5fc5\u987b\u8fdb\u884c null \u68c0\u67e5\u6216\u8005\u4f7f\u7528\u5141\u8bb8 null \u7684\u5b9e\u73b0\u3002<\/p>\n
\u4e3e\u4f8b\u6765\u8bf4\uff0c\u5728\u4ee5\u4e0b\u60c5\u51b5\u4e0b\u4f1a\u53d1\u751f\u7a7a\u6307\u9488\u5f02\u5e38\u3002<\/p>\n
String<\/span> a<\/span> =<\/span> null<\/span>;<\/span>\r\nString<\/span> b<\/span> =<\/span> \"\u3042\u3044\u3046\"<\/span>;<\/span>\r\n\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>a<\/span>.<\/span>equals<\/span>(<\/span>b<\/span>));<\/span>\/\/\u30cc\u30eb\u30dd\u3067\u843d\u3061\u307e\u3059<\/span>\r\n<\/code><\/pre>\n
\u7531\u4e8e\u53ef\u80fd\u53d1\u751f\u6545\u969c\uff0c\u56e0\u6b64\u5bf9\u53ef\u80fd\u4e3a\u7a7a\u7684\u53d8\u91cf\u9700\u8981\u8fdb\u884c\u7a7a\u503c\u68c0\u67e5\u3002<\/p>\n
String<\/span> a<\/span> =<\/span> null<\/span>;<\/span>\r\nString<\/span> b<\/span> =<\/span> \"\u3042\u3044\u3046\"<\/span>;<\/span>\r\nif<\/span> (<\/span>a<\/span>!=<\/span>null<\/span>)<\/span> {<\/span>\r\n  System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>a<\/span>.<\/span>equals<\/span>(<\/span>b<\/span>));<\/span>\/\/\u5b9f\u884c\u3055\u308c\u306a\u3044<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528 Objects \u7c7b\u7684 equals \u65b9\u6cd5<\/h2>\n
\u6bcf\u6b21\u90fd\u8fdb\u884cnull\u68c0\u67e5\u5f88\u9ebb\u70e6\u3002<\/h3>\n
\u6bcf\u6b21\u5728if\u8bed\u53e5\u4e2d\u8fdb\u884cnull\u68c0\u67e5\u7684\u884c\u4e3a\u4f1a\u5bfc\u81f4if\u8bed\u53e5\u7684\u5d4c\u5957\uff0c\u964d\u4f4e\u4e86\u53ef\u8bfb\u6027\u3002<\/p>\n
\u56e0\u6b64\uff0c\u6211\u76ee\u524d\u6b63\u5728\u52aa\u529b\u907f\u514d\u95ee\u9898\uff0c\u4f8b\u5982\u4f7f\u7528Optional\u7c7b\u578b\uff0c\u5e76\u4e14\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4f7f\u7528\u4e86Objects\u7c7b\u7684equals\u65b9\u6cd5\u3002<\/p>\n
String<\/span> a<\/span> =<\/span> null<\/span>;<\/span>\r\nString<\/span> b<\/span> =<\/span> \"\u3042\u3044\u3046\"<\/span>;<\/span>\r\nString<\/span> c<\/span> =<\/span> null<\/span>;<\/span>\r\n\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>a<\/span>.<\/span>equals<\/span>(<\/span>b<\/span>));<\/span> \/\/ false<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>a<\/span>.<\/span>equals<\/span>(<\/span>c<\/span>));<\/span> \/\/ true<\/span>\r\n\r\n<\/code><\/pre>\n
Objects\u7c7b\u7684equals\u65b9\u6cd5\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6bd4\u8f83\u4e24\u4e2anull\u5bf9\u8c61\uff0c\u4e0d\u4f1a\u5bfc\u81f4NullPointerException\u7684\u53d1\u751f\u3002<\/p>\n
\u5982\u679c\u53d8\u91cf\u53ef\u80fd\u4e3a\u7a7a\uff0c\u6211\u4eec\u5e0c\u671b\u517b\u6210\u4f7f\u7528\u8fd9\u4e2a\u4e60\u60ef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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