{"id":1009,"date":"2026-03-17T18:02:45","date_gmt":"2026-03-17T10:02:45","guid":{"rendered":"https:\/\/yunyanglib.cn\/?p=1009"},"modified":"2026-03-17T18:02:47","modified_gmt":"2026-03-17T10:02:47","slug":"%e3%80%90java%e3%80%91%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%9b%b8%e7%ad%89%e5%88%a4%e6%96%ad%ef%bc%9a%e4%bb%8e%e6%ba%90%e7%a0%81%e5%88%b0%e5%ae%9e%e6%88%98%ef%bc%8c%e9%81%bf%e5%9d%91%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=1009","title":{"rendered":"\u3010Java\u3011\u5b57\u7b26\u4e32\u76f8\u7b49\u5224\u65ad\uff1a\u4ece\u6e90\u7801\u5230\u5b9e\u6218\uff0c\u907f\u5751\u6307\u5357"},"content":{"rendered":"\n

\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\uff5e \u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u5b57\u7b26\u4e32\u76f8\u7b49\u5224\u65ad\u662f\u9ad8\u9891\u573a\u666f\uff0c\u4f46\u4e0d\u5c11\u540c\u5b66\u4f1a\u5728 ==<\/code> \u548c equals()<\/code> \u4e4b\u95f4\u8e29\u5751\uff0c\u751a\u81f3\u5ffd\u7565\u66f4\u4f18\u96c5\u7684\u8fdb\u9636\u65b9\u6848\u3002\u4eca\u5929\u5c31\u7ed3\u5408\u6e90\u7801\u548c\u5b9e\u6218\u573a\u666f\uff0c\u5f7b\u5e95\u641e\u61c2 Java \u5b57\u7b26\u4e32\u76f8\u7b49\u7684\u5224\u65ad\u903b\u8f91\uff01<\/p>\n\n\n\n

\u4e00\u3001\u6838\u5fc3\u7591\u95ee\uff1a==<\/code> \u548c equals()<\/code> \u5230\u5e95\u5dee\u5728\u54ea\uff1f<\/h2>\n\n\n\n

1.1 \u672c\u8d28\u533a\u522b<\/h3>\n\n\n\n
    \n
  • ==<\/code>\uff1a\u6bd4\u8f83\u5bf9\u8c61\u5185\u5b58\u5730\u5740<\/strong>\uff08\u5224\u65ad\u662f\u5426\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\uff09<\/li>\n\n\n\n
  • equals()<\/code>\uff1a\u6bd4\u8f83\u5bf9\u8c61\u5185\u5bb9<\/strong>\uff08\u9700\u5b50\u7c7b\u91cd\u5199\uff0c\u5426\u5219\u7b49\u4ef7\u4e8e ==<\/code>\uff09<\/li>\n<\/ul>\n\n\n\n

    1.2 \u6839\u6e90\uff1aObject \u7c7b\u7684\u9ed8\u8ba4\u5b9e\u73b0<\/h3>\n\n\n\n

    Java \u4e2d\u6240\u6709\u7c7b\u90fd\u7ee7\u627f\u81ea Object<\/code>\uff0c\u5176 equals()<\/code> \u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n

    \/\/ Object \u7c7b\u7684 equals() \u6e90\u7801\npublic boolean equals(Object obj) {\n    return (this == obj); \/\/ \u76f4\u63a5\u7528 == \u6bd4\u8f83\u5730\u5740\n}\n<\/code><\/pre>\n\n\n\n
    \u5982\u679c\u5b50\u7c7b\uff08\u6bd4\u5982 String\uff09\u4e0d\u91cd\u5199 equals()<\/code>\uff0c\u8c03\u7528\u65f6\u672c\u8d28\u8fd8\u662f\u6bd4\u8f83\u5730\u5740 \u2014\u2014 \u8fd9\u4e5f\u662f\u5f88\u591a\u65b0\u624b\u8e29\u5751\u7684\u6838\u5fc3\u539f\u56e0\uff01<\/p>\n\n\n\n
    \u4e8c\u3001String \u7c7b\u7684 equals()<\/code>\uff1a\u6e90\u7801\u6df1\u5ea6\u89e3\u6790<\/h2>\n\n\n\n
    String \u91cd\u5199\u4e86 equals()<\/code> \u65b9\u6cd5\uff0c\u4e13\u95e8\u7528\u4e8e\u6bd4\u8f83\u5b57\u7b26\u4e32\u5185\u5bb9\uff0cJDK8 \u548c JDK17 \u5b9e\u73b0\u7565\u6709\u5dee\u5f02\uff0c\u4f46\u6838\u5fc3\u903b\u8f91\u4e00\u81f4\u3002<\/p>\n\n\n\n
    2.1 JDK8 \u7248\u672c\u6e90\u7801<\/h3>\n\n\n\n
    public boolean equals(Object anObject) {\n    \/\/ 1. \u5148\u5224\u65ad\u662f\u5426\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\uff08\u5730\u5740\u76f8\u7b49\uff09\uff0c\u662f\u5219\u76f4\u63a5\u8fd4\u56de true\n    if (this == anObject) {\n        return true;\n    }\n    \/\/ 2. \u5224\u65ad\u53c2\u6570\u662f\u5426\u662f String \u7c7b\u578b\uff0c\u4e0d\u662f\u5219\u8fd4\u56de false\n    if (anObject instanceof String) {\n        String anotherString = (String)anObject;\n        int n = value.length;\n        \/\/ 3. \u957f\u5ea6\u4e0d\u540c\u76f4\u63a5\u8fd4\u56de false\uff08\u4f18\u5316\u6027\u80fd\uff09\n        if (n == anotherString.value.length) {\n            char v1[] = value;\n            char v2[] = anotherString.value;\n            int i = 0;\n            \/\/ 4. \u9010\u4e2a\u5b57\u7b26\u6bd4\u8f83\n            while (n-- != 0) {\n                if (v1[i] != v2[i])\n                    return false;\n                i++;\n            }\n            return true;\n        }\n    }\n    return false;\n}\n<\/code><\/pre>\n\n\n\n
    2.2 JDK17 \u7248\u672c\u6e90\u7801\uff08\u7b80\u5316\u7248\uff09<\/h3>\n\n\n\n
    public boolean equals(Object anObject) {\n    \/\/ 1. \u5730\u5740\u76f8\u7b49\u76f4\u63a5\u8fd4\u56de true\uff08\u540c JDK8\uff09\n    if (this == anObject) {\n        return true;\n    }\n    \/\/ 2. \u4f18\u5316\u7c7b\u578b\u5224\u65ad\uff1a\u76f4\u63a5\u7528 getClass() \u800c\u975e instanceof\uff08\u907f\u514d\u5b50\u7c7b\u5192\u5145\uff09\n    if (anObject instanceof String s) {\n        \/\/ 3. \u6309\u5b57\u7b26\u7f16\u7801\u6bd4\u8f83\uff08\u652f\u6301 UTF16\/Latin1\uff0c\u903b\u8f91\u66f4\u7075\u6d3b\uff09\n        return compareTo(s) == 0;\n    }\n    return false;\n}\n<\/code><\/pre>\n\n\n\n
    \u6838\u5fc3\u4f18\u5316\uff1aJDK17 \u7528 compareTo()<\/code> \u7edf\u4e00\u5b57\u7b26\u6bd4\u8f83\u903b\u8f91\uff0c\u540c\u65f6\u901a\u8fc7 instanceof String s<\/code> \u7b80\u5316\u7c7b\u578b\u8f6c\u6362\uff0c\u6027\u80fd\u548c\u53ef\u8bfb\u6027\u66f4\u4f18\u3002<\/p>\n\n\n\n
    \u4e09\u3001\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\uff1a\u4e3a\u4ec0\u4e48\u4e0d\u63a8\u8350 new String()<\/code>\uff1f<\/h2>\n\n\n\n
    \u8981\u5f7b\u5e95\u7406\u89e3\u5224\u65ad\u903b\u8f91\uff0c\u5fc5\u987b\u5148\u641e\u61c2 \u5b57\u7b26\u4e32\u5e38\u91cf\u6c60<\/strong>\uff08String Constant Pool\uff09\uff1a<\/p>\n\n\n\n
      \n
    • \u76f4\u63a5\u8d4b\u503c\uff1aString s = \"\u4e91\u626c\"<\/code> \u2192 \u4f18\u5148\u4ece\u5e38\u91cf\u6c60\u83b7\u53d6\u5bf9\u8c61\uff0c\u82e5\u4e0d\u5b58\u5728\u5219\u521b\u5efa\u5e76\u7f13\u5b58<\/li>\n\n\n\n
    • new \u5173\u952e\u5b57\uff1aString s = new String(\"\u4e91\u626c\")<\/code> \u2192 \u5fc5\u7136\u5728\u5806\u5185\u5b58\u521b\u5efa\u65b0\u5bf9\u8c61\uff0c\u540c\u65f6\u5e38\u91cf\u6c60\u4f1a\u540c\u6b65\u521b\u5efa\u8be5\u5b57\u7b26\u4e32\uff08\u82e5\u672a\u5b58\u5728\uff09<\/li>\n<\/ul>\n\n\n\n
      \u793a\u610f\u56fe\uff1a<\/p>\n\n\n\n
      \u5e38\u91cf\u6c60\uff1a[\"\u4e91\u626c\"]\n\u5806\u5185\u5b58\uff1anew String(\"\u4e91\u626c\") \u2192 \u65b0\u5730\u5740\n<\/code><\/pre>\n\n\n\n
      \u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48 new String(\"\u4e91\u626c\") == \"\u4e91\u626c\"<\/code> \u4f1a\u8fd4\u56de false<\/code>\u2014\u2014 \u4e24\u8005\u5185\u5b58\u5730\u5740\u5b8c\u5168\u4e0d\u540c\uff01<\/p>\n\n\n\n
      \u56db\u3001\u5b9e\u6218\u4f8b\u9898\uff1a6 \u79cd\u573a\u666f\u5168\u8986\u76d6<\/h2>\n\n\n\n
      \u76f4\u63a5\u4e0a\u4ee3\u7801\uff0c\u7ed3\u5408\u6ce8\u91ca\u7406\u89e3\uff1a<\/p>\n\n\n\n
      public class StringEqualsTest {\n    public static void main(String[] args) {\n        \/\/ 1. new String \u4e0e\u5e38\u91cf\u6c60\u5b57\u7b26\u4e32\u6bd4\u8f83\uff08\u5185\u5bb9\u76f8\u540c\uff0c\u5730\u5740\u4e0d\u540c\uff09\n        System.out.println(new String(\"\u4e91\u626c\").equals(\"\u4e91\u626c\")); \/\/ true\uff08equals \u6bd4\u5185\u5bb9\uff09\n        \n        \/\/ 2. new String \u4e0e\u5e38\u91cf\u6c60\u5b57\u7b26\u4e32\u7528 == \u6bd4\u8f83\n        System.out.println(new String(\"\u4e91\u626c\") == \"\u4e91\u626c\"); \/\/ false\uff08\u5730\u5740\u4e0d\u540c\uff09\n        \n        \/\/ 3. \u4e24\u4e2a new String \u6bd4\u8f83\uff08\u5806\u4e2d\u4e24\u4e2a\u4e0d\u540c\u5bf9\u8c61\uff09\n        System.out.println(new String(\"\u4e91\u626c\") == new String(\"\u4e91\u626c\")); \/\/ false\uff08\u5730\u5740\u4e0d\u540c\uff09\n        \n        \/\/ 4. \u5e38\u91cf\u6c60\u5b57\u7b26\u4e32\u76f4\u63a5\u6bd4\u8f83\uff08\u540c\u4e00\u5bf9\u8c61\uff09\n        System.out.println(\"\u4e91\u626c\" == \"\u4e91\u626c\"); \/\/ true\uff08\u5e38\u91cf\u6c60\u7f13\u5b58\u590d\u7528\uff09\n        \n        \/\/ 5. \u5e38\u91cf\u5b57\u7b26\u4e32\u62fc\u63a5\uff08\u7f16\u8bd1\u5668\u4f18\u5316\u4e3a\u5b8c\u6574\u5b57\u7b26\u4e32\uff09\n        System.out.println(\"\u4e91\u626c\" == \"\u4e91\" + \"\u626c\"); \/\/ true\uff08\u7f16\u8bd1\u540e\u4e3a \"\u4e91\u626c\"\uff09\n        \n        \/\/ 6. intern() \u65b9\u6cd5\uff1a\u5c06\u5806\u4e2d\u5b57\u7b26\u4e32\u5165\u6c60\u5e76\u8fd4\u56de\u5e38\u91cf\u6c60\u5f15\u7528\n        System.out.println(new String(\"\u4e91\u626c\").intern() == \"\u4e91\u626c\"); \/\/ true\uff08intern() \u8fd4\u56de\u5e38\u91cf\u6c60\u5bf9\u8c61\uff09\n    }\n}<\/code><\/pre>\n\n\n\n
      \"\"<\/figure>\n\n\n\n
      \u8fd0\u884c\u7ed3\u679c\uff1atrue false false true true true<\/code>\uff0c\u5b8c\u5168\u7b26\u5408\u9884\u671f\uff01<\/p>\n\n\n\n
      \u4e94\u3001\u8fdb\u9636\u65b9\u6848\uff1a\u66f4\u4f18\u96c5\u7684\u5b57\u7b26\u4e32\u6bd4\u8f83<\/h2>\n\n\n\n
      \u9664\u4e86 String.equals()<\/code>\uff0c\u8fd8\u6709\u4e24\u4e2a\u573a\u666f\u5316\u66f4\u5f3a\u7684\u65b9\u6848\uff0c\u907f\u514d\u8e29\u5751\u540c\u65f6\u63d0\u5347\u4ee3\u7801\u5065\u58ee\u6027\u3002<\/p>\n\n\n\n
      5.1 Objects.equals ()\uff1a\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38<\/h3>\n\n\n\n
      \u76f4\u63a5\u7528 a.equals(b)<\/code> \u65f6\uff0c\u82e5 a<\/code> \u4e3a null<\/code> \u4f1a\u629b\u51fa NullPointerException<\/code>\uff0c\u800c Objects.equals()<\/code> \u5b8c\u7f8e\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff1a<\/p>\n\n\n\n
      import java.util.Objects;\n\npublic class ObjectsEqualsTest {\n    public static void main(String[] args) {\n        String a = null;\n        String b = \"\u4e91\u626c\";\n        \n        \/\/ \u98ce\u9669\uff1aa \u4e3a null \u65f6\u629b\u51fa\u7a7a\u6307\u9488\n        \/\/ System.out.println(a.equals(b)); \n        \n        \/\/ \u5b89\u5168\uff1a\u65e0\u9700\u5224\u7a7a\uff0c\u76f4\u63a5\u6bd4\u8f83\n        System.out.println(Objects.equals(a, b)); \/\/ false\n        System.out.println(Objects.equals(\"\u4e91\u626c\", b)); \/\/ true\n    }\n}<\/code><\/pre>\n\n\n\n
      \"\"<\/figure>\n\n\n\n
      \u5176\u6e90\u7801\u903b\u8f91\uff08\u7b80\u5355\u9ad8\u6548\uff09\uff1a<\/p>\n\n\n\n
      public static boolean equals(Object a, Object b) {\n    return (a == b) || (a != null && a.equals(b));\n}\n<\/code><\/pre>\n\n\n\n
      5.2 String.contentEquals ()\uff1a\u517c\u5bb9\u6240\u6709\u5b57\u7b26\u5e8f\u5217<\/h3>\n\n\n\n
      \u5982\u679c\u9700\u8981\u6bd4\u8f83 String<\/code> \u4e0e StringBuffer<\/code>\u3001StringBuilder<\/code> \u7b49 CharSequence<\/code> \u5b9e\u73b0\u7c7b\uff0ccontentEquals()<\/code> \u662f\u6700\u4f18\u9009\u62e9\uff08\u81ea\u52a8\u5904\u7406\u540c\u6b65\u548c\u7c7b\u578b\u9002\u914d\uff09\uff1a<\/p>\n\n\n\n
      public class ContentEqualsTest {\n    public static void main(String[] args) {\n        String s = \"\u4e91\u626c\";\n        StringBuffer sb = new StringBuffer(\"\u4e91\u626c\");\n        StringBuilder sbd = new StringBuilder(\"\u4e91\u626c\");\n        \n        \/\/ \u652f\u6301 StringBuffer\uff08\u81ea\u52a8\u540c\u6b65\uff09\n        System.out.println(s.contentEquals(sb)); \/\/ true\n        \/\/ \u652f\u6301 StringBuilder\n        System.out.println(s.contentEquals(sbd)); \/\/ true\n        \/\/ \u652f\u6301 String\uff08\u7b49\u4ef7\u4e8e equals()\uff09\n        System.out.println(s.contentEquals(\"\u4e91\u626c\")); \/\/ true\n    }\n}<\/code><\/pre>\n\n\n\n
      \"\"<\/figure>\n\n\n\n
      JDK17 \u6e90\u7801\u4f18\u5316\uff1a\u5bf9 StringBuffer<\/code> \u81ea\u52a8\u52a0\u9501\u540c\u6b65\uff0c\u907f\u514d\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\uff0c\u65e0\u9700\u624b\u52a8\u5904\u7406\u3002<\/p>\n\n\n\n
      \u516d\u3001\u6838\u5fc3\u603b\u7ed3\uff1a\u5982\u4f55\u9009\u62e9\u6bd4\u8f83\u65b9\u5f0f\uff1f<\/h2>\n\n\n\n
      \u573a\u666f<\/th>\u63a8\u8350\u65b9\u6848<\/th>\u6ce8\u610f\u4e8b\u9879<\/th><\/tr><\/thead>
      \u4e24\u4e2a String \u6bd4\u8f83\u5185\u5bb9<\/td>Objects.equals(a, b)<\/code><\/td>\u907f\u514d\u7a7a\u6307\u9488\uff0c\u6700\u5e38\u7528<\/td><\/tr>
      \u6bd4\u8f83 String \u4e0e CharSequence<\/td>contentEquals()<\/code><\/td>\u517c\u5bb9 StringBuffer\/StringBuilder<\/td><\/tr>
      \u5224\u65ad\u662f\u5426\u662f\u540c\u4e00\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61<\/td>==<\/code><\/td>\u4ec5\u7528\u4e8e\u5e38\u91cf\u6c60\u590d\u7528\u573a\u666f\uff08\u8c28\u614e\u4f7f\u7528\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \u6700\u540e\u8bb0\u4f4f\uff1a\u5b57\u7b26\u4e32\u6bd4\u8f83\uff0c\u4f18\u5148\u7528 Objects.equals()<\/code>\uff0c\u9664\u975e\u660e\u786e\u9700\u8981\u5224\u65ad\u5bf9\u8c61\u8eab\u4efd\uff08\u5730\u5740\uff09\uff0c\u5426\u5219\u575a\u51b3\u4e0d\u7528 ==<\/code>\uff01<\/strong><\/p>\n\n\n\n
      \u4ee5\u4e0a\u5c31\u662f\u5b57\u7b26\u4e32\u76f8\u7b49\u5224\u65ad\u7684\u5b8c\u6574\u77e5\u8bc6\u70b9\u5566\uff5e \u5b9e\u9645\u5f00\u53d1\u4e2d\u4f60\u8fd8\u9047\u5230\u8fc7\u54ea\u4e9b\u76f8\u5173\u5751\uff1f\u6216\u8005\u6709\u5176\u4ed6\u573a\u666f\u60f3\u8865\u5145\uff1f\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u7559\u8a00\u8ba8\u8bba\uff0c\u6211\u4f1a\u7b2c\u4e00\u65f6\u95f4\u56de\u590d\uff01\u5982\u679c\u9700\u8981\u83b7\u53d6\u6587\u4e2d\u5b8c\u6574\u4ee3\u7801\u793a\u4f8b\uff0c\u4e5f\u53ef\u4ee5\u79c1\u4fe1\u6211\u54e6\uff5e<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\uff5e \u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u5b57\u7b26\u4e32\u76f8\u7b49\u5224\u65ad\u662f\u9ad8\u9891\u573a\u666f\uff0c\u4f46\u4e0d\u5c11\u540c\u5b66\u4f1a\u5728 == \u548c equals() \u4e4b\u95f4\u8e29\u5751<\/p>\n
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