{"id":314570,"date":"2024-05-20T23:37:01","date_gmt":"2024-05-20T15:37:01","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/314570.html"},"modified":"2024-05-20T23:37:10","modified_gmt":"2024-05-20T15:37:10","slug":"java-%e4%b8%ad-set-%e9%9b%86%e5%90%88%e7%9a%84%e7%89%b9%e7%82%b9%e6%9c%89%e5%93%aa%e4%ba%9b","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/314570.html","title":{"rendered":"java \u4e2d Set \u96c6\u5408\u7684\u7279\u70b9\u6709\u54ea\u4e9b"},"content":{"rendered":"

\"java<\/p>\n

Java \u4e2d Set \u96c6\u5408\u7684\u7279\u70b9\u5305\u62ec\uff1a\u65e0\u5e8f\u6027\u3001\u4e0d\u5141\u8bb8\u91cd\u590d\u5143\u7d20\u3001\u6027\u80fd\u4f18\u5316<\/strong>\u3002Set \u96c6\u5408\u662f\u4e00\u79cd\u4e0d\u5141\u8bb8\u542b\u6709\u91cd\u590d\u5143\u7d20\u7684\u96c6\u5408\u7c7b\u578b\uff0c\u5b83\u4e3b\u8981\u901a\u8fc7\u5143\u7d20\u7684 equals() \u548c hashCode() \u65b9\u6cd5\u6765\u786e\u5b9a\u5143\u7d20\u7684\u552f\u4e00\u6027\u3002\u5728Java\u6807\u51c6\u5e93\u4e2d\uff0cSet\u63a5\u53e3\u6709\u591a\u79cd\u5177\u4f53\u5b9e\u73b0\uff0c\u5b83\u4eec\u5404\u81ea\u9002\u7528\u4e8e\u4e0d\u540c\u7684\u4f7f\u7528\u573a\u666f\u3002\u5bf9\u4e8e\u65e0\u5e8f\u6027\uff0c\u5c3d\u7ba1Set\u5185\u90e8\u7ed3\u6784\u5e76\u4e0d\u4fdd\u8bc1\u5143\u7d20\u7684\u987a\u5e8f\uff0c\u4f46\u67d0\u4e9b\u5b9e\u73b0\uff08\u5982LinkedHashSet\uff09\u901a\u8fc7\u7ef4\u62a4\u5143\u7d20\u63d2\u5165\u7684\u987a\u5e8f\u6765\u63d0\u4f9b\u987a\u5e8f\u4fdd\u8bc1\u3002\u6027\u80fd\u4f18\u5316\u65b9\u9762\uff0cSet\u7684\u5404\u4e2a\u5b9e\u73b0\u7c7b\u5982HashSet\u4f7f\u7528\u4e86\u54c8\u5e0c\u8868\u7ed3\u6784\uff0c\u8fd9\u4f7f\u5f97\u5176\u5728\u5bf9\u96c6\u5408\u8fdb\u884c\u67e5\u627e\u3001\u6dfb\u52a0\u548c\u5220\u9664\u64cd\u4f5c\u65f6\u80fd\u591f\u4fdd\u6301\u8f83\u9ad8\u7684\u6548\u7387\u3002<\/p>\n<\/p>\n

\u8fdb\u4e00\u6b65\u6df1\u5165\u6765\u770b\uff0cSet\u63a5\u53e3\u7684\u5b9e\u73b0\u4e3b\u8981\u6709\u4e09\u7c7b\uff1aHashSet\u3001LinkedHashSet \u548c TreeSet<\/strong>\u3002\u4ee5\u4e0b\u5c06\u8be6\u60c5\u4ecb\u7ecd\u5b83\u4eec\u7684\u7279\u6027\u548c\u5178\u578b\u7528\u4f8b\u3002<\/p>\n<\/p>\n

\u4e00\u3001HASHSET<\/h3>\n<\/p>\n

HashSet\u662fSet\u63a5\u53e3\u7684\u4e00\u4e2a\u5e38\u7528\u5b9e\u73b0\u7c7b<\/strong>\uff0c\u5b83\u4f7f\u7528\u54c8\u5e0c\u8868\uff08\u5b9e\u9645\u4e0a\u662fHashMap\u5b9e\u4f8b\uff09\u5b58\u50a8\u5143\u7d20\u3002HashSet\u7684\u7279\u70b9<\/strong>\u4e3b\u8981\u4f53\u73b0\u5728\uff1a<\/p>\n<\/p>\n

    \n
  • \u6027\u80fd<\/strong>\uff1a\u5bf9\u4e8e\u63d2\u5165\u3001\u5220\u9664\u3001\u67e5\u627e\u7b49\u64cd\u4f5c\uff0cHashSet\u80fd\u63d0\u4f9b\u5e38\u6570\u65f6\u95f4\u7684\u6027\u80fd\uff0c\u524d\u63d0\u662f\u54c8\u5e0c\u51fd\u6570\u80fd\u591f\u5c06\u5143\u7d20\u5747\u5300\u5206\u5e03\u5728\u6876\u5185\u3002<\/li>\n
  • \u65e0\u5e8f\u96c6\u5408<\/strong>\uff1a\u5c3d\u7ba1\u5b58\u50a8\u7684\u987a\u5e8f\u65e0\u6cd5\u4fdd\u8bc1\uff0c\u4f46\u6bcf\u6b21\u904d\u5386HashSet\u5f97\u5230\u7684\u5143\u7d20\u987a\u5e8f\u901a\u5e38\u662f\u4e00\u81f4\u7684\uff0c\u9664\u975e\u6709\u7ed3\u6784\u6027\u4fee\u6539\u3002<\/li>\n<\/ul>\n

    \u8be6\u7ec6\u63cf\u8ff0HashSet\u5b9e\u73b0\u65b9\u5f0f<\/strong>\uff1a\u5f53\u4f60\u5411HashSet\u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20\u65f6\uff0c\u5b83\u9996\u5148\u8ba1\u7b97\u5143\u7d20\u7684hashCode\u503c\uff0c\u8be5\u503c\u5e2e\u52a9\u5b83\u786e\u5b9a\u5143\u7d20\u5728\u5b58\u50a8\u6876\u4f4d\u6570\u7ec4\u4e2d\u7684\u4f4d\u7f6e\u3002\u82e5\u5143\u7d20\u7684hashCode\u76f8\u540c\uff0c\u5b83\u4eec\u4ecd\u53ef\u80fd\u662f\u4e0d\u540c\u7684\u5143\u7d20\uff08\u8fd9\u53eb\u505a\u54c8\u5e0c\u78b0\u649e\uff09\uff0c\u56e0\u6b64HashSet\u4f7f\u7528equals\u65b9\u6cd5\u6765\u533a\u5206\u5b83\u4eec\u3002<\/p>\n<\/p>\n

    \u4e8c\u3001LINKEDHASHSET<\/h3>\n<\/p>\n

    LinkedHashSet\u662fHashSet\u7684\u4e00\u4e2a\u5b50\u7c7b<\/strong>\uff0c\u7ee7\u627f\u4e86HashSet\u7684\u7279\u70b9\uff0c\u540c\u65f6\u5b83\u4f7f\u7528\u53cc\u5411\u94fe\u8868\u7ef4\u62a4\u5143\u7d20\u7684\u63d2\u5165\u987a\u5e8f\u3002\u56e0\u4e3aLinkedHashSet\u5177\u6709\u53ef\u9884\u77e5\u8fed\u4ee3\u987a\u5e8f\u8fd9\u4e00\u7279\u6027\uff0c\u6240\u4ee5\u5728\u904d\u5386\u987a\u5e8f\u6709\u8981\u6c42\u7684\u573a\u666f\u4e2d\u5f88\u6709\u7528\u3002<\/p>\n<\/p>\n

      \n
    • \u6709\u5e8f\u96c6\u5408<\/strong>\uff1aLinkedHashSet\u8fed\u4ee3\u7684\u987a\u5e8f\u662f\u6240\u6709\u6761\u76ee\u63d2\u5165\u987a\u5e8f\u3002<\/li>\n
    • \u7565\u5fae\u6709\u6027\u80fd\u635f\u5931<\/strong>\uff1a\u4e0eHashSet\u76f8\u6bd4\uff0cLinkedHashSet\u5728\u6027\u80fd\u4e0a\u7565\u5fae\u964d\u4f4e\uff0c\u4f46\u8fd9\u79cd\u5dee\u8ddd\u901a\u5e38\u5f88\u5c0f\u5e76\u4e14\u4e0d\u5f71\u54cd\u5176\u5e7f\u6cdb\u4f7f\u7528\u3002<\/li>\n<\/ul>\n

      \u4e09\u3001TREESET<\/h3>\n<\/p>\n

      TreeSet\u662f\u57fa\u4e8e\u7ea2\u9ed1\u6811\uff08\u4e00\u79cd\u81ea\u5e73\u8861\u7684\u4e8c\u53c9\u67e5\u627e\u6811\uff09\u5b9e\u73b0\u7684Set<\/strong>\u3002\u4e0eHashSet\u548cLinkedHashSet\u76f8\u6bd4\uff0cTreeSet\u5177\u6709\u660e\u663e\u4e0d\u540c\u7684\u7279\u70b9\uff1a<\/p>\n<\/p>\n

        \n
      • \u6709\u5e8f\u96c6\u5408<\/strong>\uff1aTreeSet\u5b58\u50a8\u7684\u5143\u7d20\u662f\u6709\u5e8f\u7684\uff0c\u6309\u7167\u81ea\u7136\u6392\u5e8f\u6216\u8005\u6839\u636e\u6784\u9020\u65f6\u63d0\u4f9b\u7684Comparator\u8fdb\u884c\u6392\u5e8f\u3002<\/li>\n
      • \u5bf9\u4e8e\u67e5\u8be2\u548c\u64cd\u4f5c\u7684\u6027\u80fd<\/strong>\uff1aTreeSet\u63d0\u4f9b\u4e86log(n)\u65f6\u95f4\u6210\u672c\u7684\u67e5\u627e\u3001\u6dfb\u52a0\u548c\u5220\u9664\u7b49\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n

        \u8be6\u7ec6\u63cf\u8ff0TreeSet\u5b9e\u73b0\u65b9\u5f0f<\/strong>\uff1aTreeSet\u4f7f\u7528\u7ea2\u9ed1\u6811\u6765\u7ef4\u62a4\u5143\u7d20\u7684\u987a\u5e8f\u3002\u5f53\u63d2\u5165\u4e00\u4e2a\u65b0\u5143\u7d20\u65f6\uff0c\u7ea2\u9ed1\u6811\u4f1a\u5728\u6811\u4e2d\u627e\u5230\u5176\u9002\u5f53\u7684\u4f4d\u7f6e\uff0c\u5e76\u5728\u5fc5\u8981\u65f6\u8fdb\u884c\u81ea\u6211\u5e73\u8861\u64cd\u4f5c\uff0c\u786e\u4fdd\u6811\u7684\u9ad8\u5ea6\u4fdd\u6301\u5728log(n)\uff0c\u4ece\u800c\u7ef4\u6301\u64cd\u4f5c\u7684\u6548\u7387\u3002<\/p>\n<\/p>\n

        \u56db\u3001SET\u96c6\u5408\u7684\u9009\u62e9<\/h3>\n<\/p>\n

        \u6839\u636e\u4e0d\u540c\u7684\u9700\u6c42\uff0c\u9009\u62e9\u5408\u9002\u7684Set\u5b9e\u73b0\u975e\u5e38\u91cd\u8981\uff1a<\/p>\n<\/p>\n

          \n
        • \u82e5\u4e0d\u5173\u5fc3\u5143\u7d20\u7684\u987a\u5e8f\uff0c\u540c\u65f6\u8981\u6c42\u9ad8\u6548\u7387\u7684\u64cd\u4f5c\uff0c\u901a\u5e38\u9009\u62e9HashSet<\/strong>\u3002<\/li>\n
        • \u82e5\u9700\u8981\u7ef4\u62a4\u5143\u7d20\u7684\u6dfb\u52a0\u987a\u5e8f\uff0c\u5219\u9009\u62e9LinkedHashSet<\/strong>\u3002<\/li>\n
        • \u800c\u9700\u8981\u5bf9\u96c6\u5408\u5143\u7d20\u8fdb\u884c\u6392\u5e8f\uff0c\u5219\u5e94\u9009\u62e9TreeSet<\/strong>\u3002<\/li>\n<\/ul>\n

          \u901a\u8fc7\u660e\u667a\u5730\u9009\u62e9\u9002\u5408\u5e94\u7528\u573a\u666f\u7684Set\u5b9e\u73b0\uff0c\u4f60\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u96c6\u5408\u65e2\u6ee1\u8db3\u529f\u80fd\u8981\u6c42\uff0c\u53c8\u80fd\u63d0\u4f9b\u4f18\u826f\u7684\u6027\u80fd\u8868\u73b0\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u4f60\u8fd8\u53ef\u80fd\u9700\u8981\u5173\u6ce8Set\u5b9e\u73b0\u7684\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\uff0c\u5c3d\u7ba1\u6807\u51c6\u5e93\u4e2d\u7684Set\u5b9e\u73b0\u901a\u5e38\u5e76\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4f46\u4f60\u53ef\u4ee5\u901a\u8fc7Collections.synchronizedSet\u65b9\u6cd5\u6216\u8005\u4f7f\u7528\u5e76\u53d1\u96c6\u5408\u7c7b\u50cfConcurrentSkipListSet\u6765\u89e3\u51b3\u5e76\u53d1\u8bbf\u95ee\u7684\u5b89\u5168\u6027\u95ee\u9898\u3002<\/p>\n<\/p>\n

          \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

          1. Set\u96c6\u5408\u662f\u65e0\u5e8f\u7684<\/strong>\uff1aSet\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u662f\u65e0\u5e8f\u7684\uff0c\u5373\u63d2\u5165\u5143\u7d20\u7684\u987a\u5e8f\u4e0e\u5143\u7d20\u5728\u96c6\u5408\u4e2d\u7684\u6392\u5217\u987a\u5e8f\u65e0\u5173\u3002<\/p>\n

          2. Set\u96c6\u5408\u4e0d\u5141\u8bb8\u91cd\u590d\u5143\u7d20<\/strong>\uff1aSet\u96c6\u5408\u4e2d\u4e0d\u5141\u8bb8\u5b58\u5728\u91cd\u590d\u7684\u5143\u7d20\uff0c\u5373\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u552f\u4e00\u7684\u3002<\/p>\n

          3. Set\u96c6\u5408\u53ef\u4ee5\u5b58\u50a8\u4e0d\u540c\u7c7b\u578b\u7684\u5143\u7d20<\/strong>\uff1a\u5728Java\u4e2d\uff0cSet\u96c6\u5408\u53ef\u4ee5\u5b58\u50a8\u4e0d\u540c\u7c7b\u578b\u7684\u5143\u7d20\uff0c\u5373\u53ef\u4ee5\u5c06\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\u6dfb\u52a0\u5230Set\u96c6\u5408\u4e2d\u3002<\/p>\n

            \n
          1. \n

            Set\u96c6\u5408\u53ef\u4ee5\u4f7f\u7528\u8fed\u4ee3\u5668\u8fdb\u884c\u904d\u5386\uff1a\u901a\u8fc7\u4f7f\u7528\u8fed\u4ee3\u5668\uff0c\u53ef\u4ee5\u4fbf\u5229Set\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5143\u7d20\uff0c\u4ece\u800c\u5bf9\u96c6\u5408\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<\/li>\n

          2. \n

            Set\u96c6\u5408\u5177\u6709\u9ad8\u6548\u7684\u67e5\u627e\u7279\u6027\uff1aSet\u96c6\u5408\u5185\u90e8\u4f7f\u7528\u4e86\u54c8\u5e0c\u7b97\u6cd5\uff0c\u56e0\u6b64\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u5143\u7d20\u7684\u5feb\u901f\u67e5\u627e\u548c\u5b9a\u4f4d\u3002<\/p>\n<\/li>\n

          3. \n

            Set\u96c6\u5408\u5e38\u7528\u7684\u5b9e\u73b0\u7c7b\u6709HashSet\u548cTreeSet\uff1aHashSet\u662f\u57fa\u4e8e\u54c8\u5e0c\u8868\u5b9e\u73b0\u7684\uff0c\u5177\u6709\u5feb\u901f\u7684\u63d2\u5165\u548c\u67e5\u627e\u7279\u6027\uff1bTreeSet\u662f\u57fa\u4e8e\u7ea2\u9ed1\u6811\u5b9e\u73b0\u7684\uff0c\u53ef\u4ee5\u5bf9\u5143\u7d20\u8fdb\u884c\u6709\u5e8f\u6392\u5217\u3002<\/p>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"Java \u4e2d Set \u96c6\u5408\u7684\u7279\u70b9\u5305\u62ec\uff1a\u65e0\u5e8f\u6027\u3001\u4e0d\u5141\u8bb8\u91cd\u590d\u5143\u7d20\u3001\u6027\u80fd\u4f18\u5316\u3002Set \u96c6\u5408\u662f\u4e00\u79cd\u4e0d\u5141\u8bb8\u542b\u6709\u91cd\u590d\u5143\u7d20\u7684 […]","protected":false},"author":3,"featured_media":314576,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/314570"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=314570"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/314570\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/314576"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=314570"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=314570"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=314570"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}