{"id":449,"date":"2022-11-11T05:04:01","date_gmt":"2023-10-07T13:04:12","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%9c%a8java%e4%b8%ad%ef%bc%8cequals%e6%96%b9%e6%b3%95%e5%92%8chashcode%e6%96%b9%e6%b3%95%e7%9a%84%e5%8a%9f%e8%83%bd%e7%9b%b8%e5%90%8c%e3%80%82note-this-paraphrase-assumes-that-you-are-looking\/"},"modified":"2025-08-02T10:21:33","modified_gmt":"2025-08-02T02:21:33","slug":"%e5%9c%a8java%e4%b8%ad%ef%bc%8cequals%e6%96%b9%e6%b3%95%e5%92%8chashcode%e6%96%b9%e6%b3%95%e7%9a%84%e5%8a%9f%e8%83%bd%e7%9b%b8%e5%90%8c%e3%80%82note-this-paraphrase-assumes-that-you-are-looking","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%ef%bc%8cequals%e6%96%b9%e6%b3%95%e5%92%8chashcode%e6%96%b9%e6%b3%95%e7%9a%84%e5%8a%9f%e8%83%bd%e7%9b%b8%e5%90%8c%e3%80%82note-this-paraphrase-assumes-that-you-are-looking\/","title":{"rendered":"Java\u4e2dequals()\u4e0ehashCode()\u65b9\u6cd5\u7684\u533a\u522b\u4e0e\u8054\u7cfb\uff1a\u6b63\u786e\u4f7f\u7528\u6307\u5357"},"content":{"rendered":"

\u5728Object\u7c7b\u4e2d\u5b58\u5728Java\u7684equals()\u548chashCode()\u65b9\u6cd5\u3002\u56e0\u6b64\uff0c\u6bcf\u4e2aJava\u7c7b\u90fd\u4f1a\u83b7\u5f97equals()\u548chashCode()\u7684\u9ed8\u8ba4\u5b9e\u73b0\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecdJava\u7684equals()\u548chashCode()\u65b9\u6cd5\u3002<\/p>\n

Java \u7684 equals() \u65b9\u6cd5\u662f\u76f8\u7b49\u6bd4\u8f83\u7684\u51fd\u6570<\/h2>\n

Object\u7c7b\u4e2d\u5b9a\u4e49\u4e86equals()\u65b9\u6cd5\uff0c\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n

public boolean equals(Object obj) {\r\n        return (this == obj);\r\n}\r\n<\/code><\/pre>\n
\u6839\u636eJava\u6587\u6863\u4e2dequals()\u65b9\u6cd5\u7684\u8bf4\u660e\uff0c\u4efb\u4f55\u5b9e\u73b0\u90fd\u5e94\u9075\u5faa\u4ee5\u4e0b\u539f\u5219\uff1a<\/p>\n
    \n
  • \u5bf9\u4e8e\u4efb\u4f55\u5bf9\u8c61x\uff0cx.equals(x)\u5e94\u8be5\u8fd4\u56detrue\u3002<\/li>\n
  • \u5bf9\u4e8e\u4efb\u4f55\u4e24\u4e2a\u5bf9\u8c61x\u548cy\uff0c\u5f53\u4e14\u4ec5\u5f53y.equals(x)\u8fd4\u56detrue\u65f6\uff0cx.equals(y)\u5e94\u8be5\u8fd4\u56detrue\u3002<\/li>\n
  • \u5bf9\u4e8e\u591a\u4e2a\u5bf9\u8c61x\u3001y\u548cz\uff0c\u5982\u679cx.equals(y)\u8fd4\u56detrue\u4e14y.equals(z)\u8fd4\u56detrue\uff0c\u90a3\u4e48x.equals(z)\u5e94\u8be5\u8fd4\u56detrue\u3002<\/li>\n
  • \u591a\u6b21\u8c03\u7528x.equals(y)\u5e94\u8be5\u8fd4\u56de\u76f8\u540c\u7684\u7ed3\u679c\uff0c\u9664\u975e\u5728equals()\u65b9\u6cd5\u5b9e\u73b0\u4e2d\u4f7f\u7528\u7684\u4efb\u4f55\u5bf9\u8c61\u5c5e\u6027\u88ab\u4fee\u6539\u3002<\/li>\n
  • Object\u7c7b\u7684equals()\u65b9\u6cd5\u5b9e\u73b0\u53ea\u6709\u5728\u4e24\u4e2a\u5f15\u7528\u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61\u65f6\u624d\u8fd4\u56detrue\u3002<\/li>\n<\/ul>\n
    Java\u7684hashCode()\u65b9\u6cd5<\/h2>\n
    Java\u5bf9\u8c61\u7684hashCode()\u662f\u4e00\u4e2a\u672c\u5730\u65b9\u6cd5\uff0c\u5b83\u8fd4\u56de\u5bf9\u8c61\u7684\u6574\u6570\u54c8\u5e0c\u7801\u503c\u3002hashCode()\u65b9\u6cd5\u7684\u4e00\u822c\u7ea6\u5b9a\u662f\uff1a<\/p>\n
      \n
    • \u591a\u6b21\u8c03\u7528hashCode()\u5e94\u8be5\u8fd4\u56de\u76f8\u540c\u7684\u6574\u6570\u503c\uff0c\u9664\u975e\u5728equals()\u65b9\u6cd5\u4e2d\u4f7f\u7528\u7684\u5bf9\u8c61\u5c5e\u6027\u88ab\u4fee\u6539\u3002<\/li>\n
    • \u5728\u540c\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u7684\u591a\u6b21\u6267\u884c\u4e2d\uff0c\u5bf9\u8c61\u7684\u54c8\u5e0c\u7801\u503c\u53ef\u80fd\u4f1a\u6539\u53d8\u3002<\/li>\n
    • \u5982\u679c\u6839\u636eequals()\u65b9\u6cd5\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49\uff0c\u90a3\u4e48\u5b83\u4eec\u7684\u54c8\u5e0c\u7801\u5fc5\u987b\u76f8\u540c\u3002<\/li>\n
    • \u5982\u679c\u6839\u636eequals()\u65b9\u6cd5\u4e24\u4e2a\u5bf9\u8c61\u4e0d\u76f8\u7b49\uff0c\u5b83\u4eec\u7684\u54c8\u5e0c\u7801\u4e0d\u4e00\u5b9a\u8981\u4e0d\u540c\u3002\u5b83\u4eec\u7684\u54c8\u5e0c\u7801\u503c\u53ef\u80fd\u76f8\u7b49\u4e5f\u53ef\u80fd\u4e0d\u76f8\u7b49\u3002<\/li>\n<\/ul>\n
      equals()\u548chashCode()\u65b9\u6cd5\u7684\u91cd\u8981\u6027<\/h2>\n
      \u5728Java\u4e2d\uff0chashCode()\u548cequals()\u65b9\u6cd5\u88ab\u7528\u4e8e\u57fa\u4e8e\u54c8\u5e0c\u8868\u7684\u5b9e\u73b0\u6765\u5b58\u50a8\u548c\u68c0\u7d22\u6570\u636e\u3002\u6211\u5728\u300aJava\u4e2d\u7684HashMap\u5de5\u4f5c\u539f\u7406\u300b\u4e2d\u5df2\u7ecf\u8be6\u7ec6\u89e3\u91ca\u4e86\u8fd9\u4e00\u70b9\u3002equals()\u548chashCode()\u7684\u5b9e\u73b0\u5e94\u9075\u5faa\u4ee5\u4e0b\u89c4\u5219\uff1a<\/p>\n
        \n
      • \u5982\u679co1.equals(o2)\uff0c\u90a3\u4e48o1.hashCode() == o2.hashCode()\u5e94\u8be5\u59cb\u7ec8\u4e3atrue\u3002<\/li>\n
      • \u5982\u679co1.hashCode() == o2.hashCode\u4e3atrue\uff0c\u5e76\u4e0d\u610f\u5473\u7740o1.equals(o2)\u5c06\u4e3atrue\u3002<\/li>\n<\/ul>\n
        \u4f55\u65f6\u9700\u8981\u91cd\u5199equals()\u548chashCode()\u65b9\u6cd5\uff1f<\/h2>\n
        \u5f53\u6211\u4eec\u91cd\u5199equals()\u65b9\u6cd5\u65f6\uff0c\u51e0\u4e4e\u5fc5\u987b\u540c\u65f6\u91cd\u5199hashCode()\u65b9\u6cd5\uff0c\u4ee5\u907f\u514d\u6211\u4eec\u7684\u5b9e\u73b0\u8fdd\u53cd\u5b83\u4eec\u4e4b\u95f4\u7684\u7ea6\u5b9a\u3002\u8bf7\u6ce8\u610f\uff0c\u5982\u679cequals()\u548chashCode()\u7684\u7ea6\u5b9a\u88ab\u8fdd\u53cd\uff0c\u7a0b\u5e8f\u4e0d\u4f1a\u629b\u51fa\u4efb\u4f55\u5f02\u5e38\uff0c\u5982\u679c\u60a8\u4e0d\u6253\u7b97\u5c06\u8be5\u7c7b\u7528\u4f5c\u54c8\u5e0c\u8868\u952e\uff0c\u5219\u4e0d\u4f1a\u51fa\u73b0\u4efb\u4f55\u95ee\u9898\u3002\u5982\u679c\u6253\u7b97\u5c06\u7c7b\u7528\u4f5c\u54c8\u5e0c\u8868\u7684\u952e\uff0c\u5219\u5fc5\u987b\u540c\u65f6\u91cd\u5199equals()\u548chashCode()\u65b9\u6cd5\u3002\u8ba9\u6211\u4eec\u6765\u770b\u770b\u5f53\u6211\u4eec\u4f9d\u8d56\u9ed8\u8ba4\u7684equals()\u548chashCode()\u65b9\u6cd5\u7684\u5b9e\u73b0\uff0c\u5e76\u4f7f\u7528\u81ea\u5b9a\u4e49\u7c7b\u4f5c\u4e3aHashMap\u7684\u952e\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002<\/p>\n
        package com.Olivia.java;\r\n\r\npublic class DataKey {\r\n\r\n\tprivate String name;\r\n\tprivate int id;\r\n\r\n        \/\/ getter and setter methods\r\n\r\n\t@Override\r\n\tpublic String toString() {\r\n\t\treturn \"DataKey [name=\" + name + \", id=\" + id + \"]\";\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
        package com.Olivia.java;\r\n\r\nimport java.util.HashMap;\r\nimport java.util.Map;\r\n\r\npublic class HashingTest {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tMap<DataKey, Integer> hm = getAllData();\r\n\r\n\t\tDataKey dk = new DataKey();\r\n\t\tdk.setId(1);\r\n\t\tdk.setName(\"Pankaj\");\r\n\t\tSystem.out.println(dk.hashCode());\r\n\r\n\t\tInteger value = hm.get(dk);\r\n\r\n\t\tSystem.out.println(value);\r\n\r\n\t}\r\n\r\n\tprivate static Map<DataKey, Integer> getAllData() {\r\n\t\tMap<DataKey, Integer> hm = new HashMap<>();\r\n\r\n\t\tDataKey dk = new DataKey();\r\n\t\tdk.setId(1);\r\n\t\tdk.setName(\"Pankaj\");\r\n\t\tSystem.out.println(dk.hashCode());\r\n\r\n\t\thm.put(dk, 10);\r\n\r\n\t\treturn hm;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
        \u5f53\u6211\u4eec\u8fd0\u884c\u4ee5\u4e0a\u7a0b\u5e8f\u65f6\uff0c\u5b83\u4f1a\u6253\u5370\u51fanull\u3002\u8fd9\u662f\u56e0\u4e3aObject\u7c7b\u7684hashCode()\u65b9\u6cd5\u7528\u4e8e\u67e5\u627e\u6876\u4ee5\u5bfb\u627e\u952e\u3002\u7531\u4e8e\u6211\u4eec\u65e0\u6cd5\u8bbf\u95eeHashMap\u7684\u952e\uff0c\u5e76\u4e14\u6211\u4eec\u6b63\u5728\u91cd\u65b0\u521b\u5efa\u952e\u6765\u68c0\u7d22\u6570\u636e\uff0c\u60a8\u4f1a\u6ce8\u610f\u5230\u4e24\u4e2a\u5bf9\u8c61\u7684\u54c8\u5e0c\u7801\u503c\u662f\u4e0d\u540c\u7684\uff0c\u56e0\u6b64\u627e\u4e0d\u5230\u503c\u3002<\/p>\n
        \u5b9e\u73b0equals()\u548chashCode()\u65b9\u6cd5<\/h2>\n
        \"eclipse\u751f\u6210hashCode\u548cequals\u65b9\u6cd5\"<\/div>\n
        @Override\r\npublic int hashCode() {\r\n\tfinal int prime = 31;\r\n\tint result = 1;\r\n\tresult = prime * result + id;\r\n\tresult = prime * result + ((name == null) ? 0 : name.hashCode());\r\n\treturn result;\r\n}\r\n\r\n@Override\r\npublic boolean equals(Object obj) {\r\n\tif (this == obj)\r\n\t\treturn true;\r\n\tif (obj == null)\r\n\t\treturn false;\r\n\tif (getClass() != obj.getClass())\r\n\t\treturn false;\r\n\tDataKey other = (DataKey) obj;\r\n\tif (id != other.id)\r\n\t\treturn false;\r\n\tif (name == null) {\r\n\t\tif (other.name != null)\r\n\t\t\treturn false;\r\n\t} else if (!name.equals(other.name))\r\n\t\treturn false;\r\n\treturn true;\r\n}\r\n<\/code><\/pre>\n
        \u8bf7\u6ce8\u610f\uff0cequals()\u548chashCode()\u65b9\u6cd5\u90fd\u4f7f\u7528\u76f8\u540c\u7684\u5b57\u6bb5\u8fdb\u884c\u8ba1\u7b97\uff0c\u4ee5\u786e\u4fdd\u5b83\u4eec\u7684\u7ea6\u5b9a\u4ecd\u7136\u6709\u6548\u3002\u5982\u679c\u60a8\u518d\u6b21\u8fd0\u884c\u6d4b\u8bd5\u7a0b\u5e8f\uff0c\u6211\u4eec\u5c06\u4ece\u6620\u5c04\u4e2d\u83b7\u53d6\u5bf9\u8c61\uff0c\u5e76\u4e14\u7a0b\u5e8f\u5c06\u6253\u537010\u3002\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528Project Lombok\u81ea\u52a8\u751f\u6210equals\u548chashCode\u65b9\u6cd5\u7684\u5b9e\u73b0\u3002<\/p>\n
        \u54c8\u5e0c\u51b2\u7a81\u662f\u4ec0\u4e48\uff1f<\/h2>\n
        \u7b80\u800c\u8a00\u4e4b\uff0cJava\u7684\u54c8\u5e0c\u8868\u5b9e\u73b0\u4f7f\u7528\u4ee5\u4e0b\u903b\u8f91\u8fdb\u884c\u83b7\u53d6\u548c\u653e\u7f6e\u64cd\u4f5c\uff1a<\/p>\n
          \n
        1. \u9996\u5148\uff0c\u4f7f\u7528”key”\u7684\u54c8\u5e0c\u7801\u8bc6\u522b\u8981\u4f7f\u7528\u7684”\u6876”\uff08Bucket\uff09\u3002<\/li>\n
        2. \u5982\u679c\u6876\u4e2d\u6ca1\u6709\u5177\u6709\u76f8\u540c\u54c8\u5e0c\u7801\u7684\u5bf9\u8c61\uff0c\u5219\u5c06\u5bf9\u8c61\u6dfb\u52a0\u5230\u653e\u64cd\u4f5c\u4e2d\uff0c\u5e76\u4e3a\u83b7\u53d6\u64cd\u4f5c\u8fd4\u56denull\u3002<\/li>\n
        3. \u5982\u679c\u6876\u4e2d\u6709\u5176\u4ed6\u5177\u6709\u76f8\u540c\u54c8\u5e0c\u7801\u7684\u5bf9\u8c61\uff0c\u5219\u4f7f\u7528equals()\u65b9\u6cd5\uff1a\n
            \n
          • \u5982\u679cequals()\u8fd4\u56detrue\u4e14\u4e3a\u653e\u64cd\u4f5c\uff0c\u5219\u8986\u76d6\u5bf9\u8c61\u503c\u3002<\/li>\n
          • \u5982\u679cequals()\u8fd4\u56defalse\u4e14\u4e3a\u653e\u64cd\u4f5c\uff0c\u5219\u5c06\u65b0\u6761\u76ee\u6dfb\u52a0\u5230\u6876\u4e2d\u3002<\/li>\n
          • \u5982\u679cequals()\u8fd4\u56detrue\u4e14\u4e3a\u53d6\u64cd\u4f5c\uff0c\u5219\u8fd4\u56de\u5bf9\u8c61\u503c\u3002<\/li>\n
          • \u5982\u679cequals()\u8fd4\u56defalse\u4e14\u4e3a\u53d6\u64cd\u4f5c\uff0c\u5219\u8fd4\u56denull\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
            \"Java<\/div>\n
            \u5982\u679c\u6211\u4eec\u4e0d\u5b9e\u73b0hashCode()\u548cequals()\u4f1a\u600e\u4e48\u6837\uff1f<\/h2>\n
            \u6211\u4eec\u5df2\u7ecf\u5728\u4e0a\u9762\u770b\u5230\uff0c\u5982\u679c\u6ca1\u6709\u5b9e\u73b0hashCode()\u65b9\u6cd5\uff0c\u6211\u4eec\u5c06\u65e0\u6cd5\u68c0\u7d22\u5230\u503c\uff0c\u56e0\u4e3aHashMap\u4f7f\u7528\u54c8\u5e0c\u7801\u6765\u627e\u5230\u5b58\u50a8\u6761\u76ee\u7684\u6876\u3002\u5982\u679c\u6211\u4eec\u53ea\u5b9e\u73b0hashCode()\u65b9\u6cd5\u800c\u6ca1\u6709\u5b9e\u73b0equals()\u65b9\u6cd5\uff0c\u540c\u6837\u4e5f\u65e0\u6cd5\u68c0\u7d22\u5230\u503c\uff0c\u56e0\u4e3aequals()\u65b9\u6cd5\u4f1a\u8fd4\u56defalse\u3002<\/p>\n
            \u5b9e\u73b0equals()\u548chashCode()\u65b9\u6cd5\u7684\u6700\u4f73\u5b9e\u8df5<\/h2>\n
              \n
            • \u5728equals()\u548chashCode()\u65b9\u6cd5\u5b9e\u73b0\u4e2d\u4f7f\u7528\u76f8\u540c\u7684\u5c5e\u6027\uff0c\u8fd9\u6837\u5f53\u4efb\u4f55\u5c5e\u6027\u66f4\u65b0\u65f6\uff0c\u5b83\u4eec\u7684\u7ea6\u5b9a\u4e0d\u4f1a\u88ab\u8fdd\u53cd\u3002<\/li>\n
            • \u6700\u597d\u4f7f\u7528\u4e0d\u53ef\u53d8\u5bf9\u8c61\u4f5c\u4e3a\u54c8\u5e0c\u8868\u952e\uff0c\u8fd9\u6837\u6211\u4eec\u53ef\u4ee5\u7f13\u5b58\u54c8\u5e0c\u7801\u800c\u4e0d\u662f\u5728\u6bcf\u6b21\u8c03\u7528\u65f6\u8ba1\u7b97\u5b83\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48String\u662f\u54c8\u5e0c\u8868\u952e\u7684\u826f\u597d\u5019\u9009\uff0c\u56e0\u4e3a\u5b83\u662f\u4e0d\u53ef\u53d8\u7684\u5e76\u4e14\u7f13\u5b58\u4e86\u54c8\u5e0c\u7801\u503c\u3002<\/li>\n
            • \u5b9e\u73b0hashCode()\u65b9\u6cd5\uff0c\u4f7f\u54c8\u5e0c\u51b2\u7a81\u7684\u6570\u91cf\u6700\u5c11\uff0c\u5e76\u4e14\u6761\u76ee\u5747\u5300\u5206\u5e03\u5728\u6240\u6709\u6876\u4e2d\u3002<\/li>\n<\/ul>\n
              \u4f60\u53ef\u4ee5\u4ece\u6211\u4eec\u7684GitHub\u4ed3\u5e93\u4e0b\u8f7d\u5b8c\u6574\u7684\u4ee3\u7801\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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