{"id":3285,"date":"2024-06-23T16:18:11","date_gmt":"2024-06-23T08:18:11","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=3285"},"modified":"2024-12-07T17:13:51","modified_gmt":"2024-12-07T09:13:51","slug":"java%e4%b8%ad%e7%9a%84map%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=3285","title":{"rendered":"Java\u4e2d\u7684Map\u8be6\u89e3"},"content":{"rendered":"\n

Java\u4e2d\u7684Map<\/code>\u63a5\u53e3\u662f\u952e\u503c\u5bf9\u96c6\u5408\u7684\u6838\u5fc3\u63a5\u53e3\uff0c\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u5e7f\u6cdb\u5e94\u7528\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecdMap<\/code>\u63a5\u53e3\u53ca\u5176\u5404\u79cd\u5b9e\u73b0\u3001\u91cd\u70b9\u89e3\u6790HashMap<\/code>\u7684\u5b9e\u73b0\u539f\u7406\uff0c\u5e76\u63d0\u4f9b\u4e00\u4e9b\u9ad8\u7ea7Map<\/code>\u76f8\u5173\u7684\u9762\u8bd5\u9898\u53ca\u89e3\u7b54\u3002<\/p>\n\n\n\n

\u4e00\u3001Map\u63a5\u53e3\u4ecb\u7ecd<\/h5>\n\n\n\n

Map<\/code>\u63a5\u53e3\u662fJava\u96c6\u5408\u6846\u67b6\u4e2d\u7684\u4e00\u4e2a\u6838\u5fc3\u63a5\u53e3\uff0c\u7528\u4e8e\u5b58\u50a8\u952e\u503c\u5bf9\u3002\u6bcf\u4e2a\u952e\uff08Key\uff09\u552f\u4e00\u5730\u6620\u5c04\u5230\u4e00\u4e2a\u503c\uff08Value\uff09\u3002\u5e38\u89c1\u7684\u64cd\u4f5c\u5305\u62ec\u63d2\u5165\u3001\u5220\u9664\u3001\u67e5\u627e\u3001\u904d\u5386\u7b49\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
Map\u63a5\u53e3\u7684\u5e38\u7528\u65b9\u6cd5<\/h6>\n\n\n\n
    \n
  • put(K key, V value)<\/code>: \u63d2\u5165\u6216\u66f4\u65b0\u952e\u503c\u5bf9\u3002<\/li>\n\n\n\n
  • get(Object key)<\/code>: \u6839\u636e\u952e\u83b7\u53d6\u5bf9\u5e94\u7684\u503c\u3002<\/li>\n\n\n\n
  • remove(Object key)<\/code>: \u5220\u9664\u952e\u503c\u5bf9\u3002<\/li>\n\n\n\n
  • containsKey(Object key)<\/code>: \u5224\u65ad\u662f\u5426\u5305\u542b\u6307\u5b9a\u952e\u3002<\/li>\n\n\n\n
  • containsValue(Object value)<\/code>: \u5224\u65ad\u662f\u5426\u5305\u542b\u6307\u5b9a\u503c\u3002<\/li>\n\n\n\n
  • size()<\/code>: \u8fd4\u56de\u952e\u503c\u5bf9\u6570\u91cf\u3002<\/li>\n\n\n\n
  • isEmpty()<\/code>: \u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u3002<\/li>\n\n\n\n
  • keySet()<\/code>: \u8fd4\u56de\u6240\u6709\u952e\u7684\u96c6\u5408\u3002<\/li>\n\n\n\n
  • values()<\/code>: \u8fd4\u56de\u6240\u6709\u503c\u7684\u96c6\u5408\u3002<\/li>\n\n\n\n
  • entrySet()<\/code>: \u8fd4\u56de\u6240\u6709\u952e\u503c\u5bf9\u7684\u96c6\u5408\u3002<\/li>\n<\/ul>\n\n\n\n
    \u4e8c\u3001Map\u79cd\u7c7b\u53ca\u7ed3\u6784<\/h5>\n\n\n\n

    Java\u63d0\u4f9b\u4e86\u591a\u79cdMap<\/code>\u7684\u5b9e\u73b0\u7c7b\uff0c\u6bcf\u79cd\u5b9e\u73b0\u7c7b\u5728\u6027\u80fd\u3001\u7ebf\u7a0b\u5b89\u5168\u6027\u548c\u6392\u5e8f\u65b9\u9762\u5404\u6709\u7279\u70b9\u3002\u5e38\u89c1\u7684Map<\/code>\u5b9e\u73b0\u7c7b\u6709\uff1a<\/p>\n\n\n\n

      \n
    1. HashMap<\/strong>\uff1a\u57fa\u4e8e\u54c8\u5e0c\u8868\u5b9e\u73b0\uff0c\u952e\u503c\u5bf9\u65e0\u5e8f\uff0c\u5141\u8bb8null\u952e\u548cnull\u503c\u3002<\/li>\n\n\n\n
    2. LinkedHashMap<\/strong>\uff1a\u57fa\u4e8e\u54c8\u5e0c\u8868\u548c\u94fe\u8868\u5b9e\u73b0\uff0c\u4fdd\u6301\u63d2\u5165\u987a\u5e8f\u6216\u8bbf\u95ee\u987a\u5e8f\u3002<\/li>\n\n\n\n
    3. TreeMap<\/strong>\uff1a\u57fa\u4e8e\u7ea2\u9ed1\u6811\u5b9e\u73b0\uff0c\u952e\u503c\u5bf9\u6309\u952e\u7684\u81ea\u7136\u987a\u5e8f\u6216\u81ea\u5b9a\u4e49\u987a\u5e8f\u6392\u5e8f\u3002<\/li>\n\n\n\n
    4. Hashtable<\/strong>\uff1a\u53e4\u8001\u7684\u5b9e\u73b0\u7c7b\uff0c\u7ebf\u7a0b\u5b89\u5168\uff0c\u4e0d\u5141\u8bb8null\u952e\u548cnull\u503c\u3002<\/li>\n\n\n\n
    5. ConcurrentHashMap<\/strong>\uff1a\u7ebf\u7a0b\u5b89\u5168\u7684\u54c8\u5e0c\u8868\u5b9e\u73b0\uff0c\u9002\u7528\u4e8e\u9ad8\u5e76\u53d1\u73af\u5883\u3002<\/li>\n<\/ol>\n\n\n\n
      \u4e09\u3001HashMap\u5b9e\u73b0\u539f\u7406\u8be6\u89e3<\/h5>\n\n\n\n

      HashMap<\/code>\u662fJava\u4e2d\u6700\u5e38\u7528\u7684Map<\/code>\u5b9e\u73b0\u7c7b\u4e4b\u4e00\uff0c\u57fa\u4e8e\u54c8\u5e0c\u8868\u5b9e\u73b0\u3002\u4e0b\u9762\u8be6\u7ec6\u89e3\u6790HashMap<\/code>\u7684\u5185\u90e8\u7ed3\u6784\u548c\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n\n\n\n

      1. \u6570\u636e\u7ed3\u6784<\/h6>\n\n\n\n

      HashMap<\/code>\u5185\u90e8\u4f7f\u7528\u6570\u7ec4\u548c\u94fe\u8868\uff08\u6216\u7ea2\u9ed1\u6811\uff09\u6765\u5b58\u50a8\u6570\u636e\uff1a<\/p>\n\n\n\n

        \n
      • \u6570\u7ec4<\/strong>\uff1aNode<K,V>[] table<\/code>\uff0c\u5b58\u50a8\u952e\u503c\u5bf9\u7684\u94fe\u8868\u6216\u7ea2\u9ed1\u6811\u7684\u5934\u8282\u70b9\u3002<\/li>\n\n\n\n
      • \u94fe\u8868<\/strong>\uff1a\u89e3\u51b3\u54c8\u5e0c\u51b2\u7a81\uff0c\u5f53\u591a\u4e2a\u952e\u7684\u54c8\u5e0c\u503c\u76f8\u540c\u65f6\uff0c\u91c7\u7528\u94fe\u8868\u5b58\u50a8\u3002<\/li>\n\n\n\n
      • \u7ea2\u9ed1\u6811<\/strong>\uff1a\u5f53\u94fe\u8868\u957f\u5ea6\u8d85\u8fc7\u9608\u503c\uff08\u9ed8\u8ba48\uff09\u65f6\uff0c\u94fe\u8868\u8f6c\u6362\u4e3a\u7ea2\u9ed1\u6811\uff0c\u63d0\u5347\u67e5\u627e\u6027\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n
        2. \u54c8\u5e0c\u51fd\u6570<\/h6>\n\n\n\n

        HashMap<\/code>\u901a\u8fc7\u952e\u7684hashCode()<\/code>\u65b9\u6cd5\u8ba1\u7b97\u54c8\u5e0c\u503c\uff0c\u5e76\u901a\u8fc7(n-1) & hash<\/code>\u8ba1\u7b97\u6570\u7ec4\u7d22\u5f15\uff0c\u5176\u4e2dn<\/code>\u662f\u6570\u7ec4\u957f\u5ea6\u3002<\/p>\n\n\n\n

        3. \u63d2\u5165\u64cd\u4f5c<\/h6>\n\n\n\n

        HashMap<\/code>\u7684\u63d2\u5165\u64cd\u4f5c\u5305\u62ec\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n\n\n\n

          \n
        1. \u8ba1\u7b97\u952e\u7684\u54c8\u5e0c\u503c\u3002<\/li>\n\n\n\n
        2. \u6839\u636e\u54c8\u5e0c\u503c\u8ba1\u7b97\u6570\u7ec4\u7d22\u5f15\u3002<\/li>\n\n\n\n
        3. \u5982\u679c\u7d22\u5f15\u4f4d\u7f6e\u4e3a\u7a7a\uff0c\u5219\u521b\u5efa\u65b0\u8282\u70b9\u5e76\u63d2\u5165\u3002<\/li>\n\n\n\n
        4. \u5982\u679c\u7d22\u5f15\u4f4d\u7f6e\u4e0d\u4e3a\u7a7a\uff0c\u904d\u5386\u94fe\u8868\u6216\u7ea2\u9ed1\u6811\uff0c\u68c0\u67e5\u662f\u5426\u5b58\u5728\u76f8\u540c\u7684\u952e\u3002<\/li>\n\n\n\n
        5. \u5982\u679c\u5b58\u5728\u76f8\u540c\u7684\u952e\uff0c\u5219\u66f4\u65b0\u503c\uff1b\u5426\u5219\uff0c\u63d2\u5165\u65b0\u8282\u70b9\u3002<\/li>\n\n\n\n
        6. \u5982\u679c\u94fe\u8868\u957f\u5ea6\u8d85\u8fc7\u9608\u503c\uff0c\u5219\u8f6c\u6362\u4e3a\u7ea2\u9ed1\u6811\u3002<\/li>\n<\/ol>\n\n\n\n
          4. \u6269\u5bb9\u673a\u5236<\/h6>\n\n\n\n

          \u5f53HashMap<\/code>\u7684\u8d1f\u8f7d\u56e0\u5b50\u8d85\u8fc7\u9608\u503c\uff08\u9ed8\u8ba40.75\uff09\u65f6\uff0c\u4f1a\u8fdb\u884c\u6269\u5bb9\uff0c\u5bb9\u91cf\u7ffb\u500d\uff0c\u5e76\u91cd\u65b0\u8ba1\u7b97\u6240\u6709\u952e\u7684\u6570\u7ec4\u7d22\u5f15\u3002<\/p>\n\n\n\n

          5. \u4ee3\u7801\u793a\u4f8b<\/h6>\n\n\n\n

          \u4ee5\u4e0b\u662fHashMap<\/code>\u7684\u7b80\u5316\u5b9e\u73b0\u4ee3\u7801\uff1a<\/p>\n\n\n\n

          public class HashMap<K, V> extends AbstractMap<K, V> implements Map<K, V>, Cloneable, Serializable {\n    \/\/ \u9ed8\u8ba4\u521d\u59cb\u5bb9\u91cf\n    static final int DEFAULT_INITIAL_CAPACITY = 1 << 4; \/\/ 16\n\n    \/\/ \u6700\u5927\u5bb9\u91cf\n    static final int MAXIMUM_CAPACITY = 1 << 30;\n\n    \/\/ \u9ed8\u8ba4\u8d1f\u8f7d\u56e0\u5b50\n    static final float DEFAULT_LOAD_FACTOR = 0.75f;\n\n    \/\/ \u8f6c\u6362\u4e3a\u7ea2\u9ed1\u6811\u7684\u9608\u503c\n    static final int TREEIFY_THRESHOLD = 8;\n\n    \/\/ \u54c8\u5e0c\u8868\u6570\u7ec4\n    transient Node<K, V>[] table;\n\n    \/\/ \u952e\u503c\u5bf9\u6570\u91cf\n    transient int size;\n\n    \/\/ \u54c8\u5e0c\u8868\u7684\u9608\u503c\n    int threshold;\n\n    \/\/ \u8d1f\u8f7d\u56e0\u5b50\n    final float loadFactor;\n\n    \/\/ \u8282\u70b9\u5185\u90e8\u7c7b\n    static class Node<K, V> implements Map.Entry<K, V> {\n        final int hash;\n        final K key;\n        V value;\n        Node<K, V> next;\n\n        Node(int hash, K key, V value, Node<K, V> next) {\n            this.hash = hash;\n            this.key = key;\n            this.value = value;\n            this.next = next;\n        }\n    }\n\n    \/\/ \u5176\u4ed6\u65b9\u6cd5\u7701\u7565...\n}<\/code><\/pre>\n\n\n\n
          \u56db\u3001\u9ad8\u7ea7Map\u5e38\u89c1\u9762\u8bd5\u9898\u53ca\u8be6\u7ec6\u89e3\u7b54<\/h5>\n\n\n\n
          1. HashMap\u548cHashtable\u7684\u533a\u522b<\/h6>\n\n\n\n
            \n
          • \u7ebf\u7a0b\u5b89\u5168<\/strong>\uff1aHashMap<\/code>\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\uff0cHashtable<\/code>\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/li>\n\n\n\n
          • \u6027\u80fd<\/strong>\uff1a\u7531\u4e8e\u7ebf\u7a0b\u5b89\u5168\u7684\u5f00\u9500\uff0cHashMap<\/code>\u6027\u80fd\u901a\u5e38\u4f18\u4e8eHashtable<\/code>\u3002<\/li>\n\n\n\n
          • null\u503c<\/strong>\uff1aHashMap<\/code>\u5141\u8bb8null\u952e\u548cnull\u503c\uff0cHashtable<\/code>\u4e0d\u5141\u8bb8\u3002<\/li>\n<\/ul>\n\n\n\n
            2. HashMap\u7684\u6269\u5bb9\u673a\u5236<\/h6>\n\n\n\n
            \u5f53HashMap<\/code>\u7684\u5927\u5c0f\u8d85\u8fc7\u9608\u503c\u65f6\uff0c\u4f1a\u8fdb\u884c\u6269\u5bb9\u3002\u6269\u5bb9\u65f6\uff0cHashMap<\/code>\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\uff0c\u5176\u5927\u5c0f\u662f\u65e7\u6570\u7ec4\u7684\u4e24\u500d\uff0c\u7136\u540e\u5c06\u65e7\u6570\u7ec4\u4e2d\u7684\u6240\u6709\u952e\u503c\u5bf9\u91cd\u65b0\u8ba1\u7b97\u54c8\u5e0c\u503c\u5e76\u653e\u5165\u65b0\u6570\u7ec4\u4e2d\u3002<\/p>\n\n\n\n
            3. ConcurrentHashMap\u7684\u5b9e\u73b0\u539f\u7406<\/h6>\n\n\n\n
            ConcurrentHashMap<\/code>\u4f7f\u7528\u5206\u6bb5\u9501\uff08Segment\uff09\u673a\u5236\u6765\u5b9e\u73b0\u5e76\u53d1\u63a7\u5236\uff0c\u6bcf\u4e2aSegment\u662f\u4e00\u4e2a\u5c0f\u7684HashMap<\/code>\u3002\u8fd9\u79cd\u65b9\u5f0f\u5141\u8bb8\u591a\u4e2a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\u4e0d\u540c\u7684Segment\uff0c\u63d0\u9ad8\u4e86\u5e76\u53d1\u6027\u80fd\u3002<\/p>\n\n\n\n
            4. \u5982\u4f55\u907f\u514dHashMap\u7684\u6b7b\u5faa\u73af\u95ee\u9898<\/h6>\n\n\n\n
            \u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u4f7f\u7528HashMap<\/code>\u65f6\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6b7b\u5faa\u73af\u3002\u89e3\u51b3\u65b9\u6848\u662f\u4f7f\u7528\u7ebf\u7a0b\u5b89\u5168\u7684\u96c6\u5408\u7c7b\uff0c\u5982ConcurrentHashMap<\/code>\u3002<\/p>\n\n\n\n
            \u4e94\u3001\u6ce8\u610f\u4e8b\u9879<\/h5>\n\n\n\n
              \n
            • \u7ebf\u7a0b\u5b89\u5168<\/strong>\uff1a\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\uff0c\u4f7f\u7528HashMap<\/code>\u9700\u8981\u5916\u90e8\u540c\u6b65\u63a7\u5236\uff0c\u5efa\u8bae\u4f7f\u7528ConcurrentHashMap<\/code>\u3002<\/li>\n\n\n\n
            • \u8d1f\u8f7d\u56e0\u5b50<\/strong>\uff1a\u8c03\u6574\u8d1f\u8f7d\u56e0\u5b50\u548c\u521d\u59cb\u5bb9\u91cf\u53ef\u4ee5\u63d0\u5347\u6027\u80fd\uff0c\u4f46\u4e5f\u9700\u8981\u6743\u8861\u5185\u5b58\u4f7f\u7528\u548c\u6269\u5bb9\u6210\u672c\u3002<\/li>\n\n\n\n
            • \u81ea\u5b9a\u4e49\u5bf9\u8c61\u4f5c\u4e3a\u952e<\/strong>\uff1a\u4f7f\u7528\u81ea\u5b9a\u4e49\u5bf9\u8c61\u4f5c\u4e3a\u952e\u65f6\uff0c\u9700\u8981\u6b63\u786e\u91cd\u5199hashCode<\/code>\u548cequals<\/code>\u65b9\u6cd5\uff0c\u4ee5\u4fdd\u8bc1\u6b63\u786e\u6027\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
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