{"id":46097,"date":"2025-07-30T02:21:07","date_gmt":"2025-07-29T18:21:07","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/46097.html"},"modified":"2025-07-30T02:21:07","modified_gmt":"2025-07-29T18:21:07","slug":"%e3%80%90%e7%a7%8b%e6%8b%9b%e5%bf%85%e7%9c%8b%e3%80%91java-%e9%9b%86%e5%90%88%e9%9d%a2%e8%af%95%e7%83%ad%e9%a2%98%ef%bc%88%e4%b8%80%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/46097.html","title":{"rendered":"\u3010\u79cb\u62db\u5fc5\u770b\u3011Java \u96c6\u5408\u9762\u8bd5\u70ed\u9898\uff08\u4e00\uff09"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

1.\u8bf4\u8bf4 Java \u4e2d HashMap \u7684\u539f\u7406？<\/p>\n

2.Java \u4e2d\u7684 List \u63a5\u53e3\u6709\u54ea\u4e9b\u5b9e\u73b0\u7c7b？<\/p>\n

3.Java \u4e2d ConcurrentHashMap 1.7 \u548c 1.8 \u4e4b\u95f4\u6709\u54ea\u4e9b\u533a\u522b？<\/p>\n

4.\u4e3a\u4ec0\u4e48 JDK 1.8 \u5bf9 HashMap \u8fdb\u884c\u4e86\u7ea2\u9ed1\u6811\u7684\u6539\u52a8？\u00a0<\/p>\n

5.JDK 1.8 \u5bf9 HashMap \u9664\u4e86\u7ea2\u9ed1\u6811\u8fd8\u8fdb\u884c\u4e86\u54ea\u4e9b\u6539\u52a8？\u00a0<\/p>\n

6.Java \u4e2d\u6709\u54ea\u4e9b\u96c6\u5408\u7c7b？\u8bf7\u7b80\u5355\u4ecb\u7ecd\u3002<\/p>\n

7.\u4e3a\u4ec0\u4e48 Java \u4e2d HashMap \u7684\u9ed8\u8ba4\u8d1f\u8f7d\u56e0\u5b50\u662f 0.75？<\/p>\n

8.Java \u4e2d HashMap \u7684\u6269\u5bb9\u673a\u5236\u662f\u600e\u6837\u7684？\u00a0\u00a0 \u00a0<\/p>\n

9.\u4e3a\u4ec0\u4e48 HashMap \u5728 Java \u4e2d\u6269\u5bb9\u65f6\u91c7\u7528 2 \u7684 n \u6b21\u65b9\u500d？<\/p>\n

10.\u6570\u7ec4\u548c\u94fe\u8868\u5728 Java \u4e2d\u7684\u533a\u522b\u662f\u4ec0\u4e48？<\/p>\n

\n

1.Java \u4e2d\u6709\u54ea\u4e9b\u96c6\u5408\u7c7b？\u8bf7\u7b80\u5355\u4ecb\u7ecd\u3002（\u4e2d）<\/h2>\n

（\u4e00\u822c\u7528\u4e8e\u6696\u573a，\u7b80\u5355\u8bb2\u8bb2\u5373\u53ef）<\/p>\n

Java \u96c6\u5408\u6846\u67b6（Java Collections Framework）\u662f Java \u6838\u5fc3\u5e93\u4e2d\u7528\u4e8e\u5b58\u50a8\u548c\u64cd\u4f5c\u6570\u636e\u96c6\u5408\u7684\u6807\u51c6\u67b6\u6784，\u4e3b\u8981\u5206\u4e3a\u00a0Collection（\u5355\u5143\u7d20\u96c6\u5408）\u548c\u00a0Map（\u952e\u503c\u5bf9\u96c6\u5408）\u4e24\u5927\u63a5\u53e3\u4f53\u7cfb\u3002<\/p>\n<\/p>\n

Collection：<\/p>\n

\"\"<\/p>\n

Map：<\/p>\n

\"\"<\/p>\n

\u56fe\u7247\u6765\u6e90<\/p>\n<\/p>\n

1）Collection \u63a5\u53e3（\u5355\u5143\u7d20\u96c6\u5408）<\/p>\n

List \u63a5\u53e3（\u6709\u5e8f\u3001\u53ef\u91cd\u590d）<\/p>\n\n\u7c7b\u540d\u6570\u636e\u7ed3\u6784\u7ebf\u7a0b\u5b89\u5168\u7279\u70b9<\/tr>\n\n\n\n\n\n\n
ArrayList<\/td>\n\u52a8\u6001\u6570\u7ec4<\/td>\n\u274c<\/td>\n\u968f\u673a\u8bbf\u95ee\u5feb，\u589e\u5220\u4e2d\u95f4\u5143\u7d20\u6162<\/td>\n<\/tr>\n
LinkedList<\/td>\n\u53cc\u5411\u94fe\u8868<\/td>\n\u274c<\/td>\n\u589e\u5220\u5feb，\u968f\u673a\u8bbf\u95ee\u6162；\u5b9e\u73b0\u4e86\u00a0Deque\u00a0\u63a5\u53e3<\/td>\n<\/tr>\n
Vector<\/td>\n\u52a8\u6001\u6570\u7ec4<\/td>\n\u2705<\/td>\n\u7ebf\u7a0b\u5b89\u5168\u4f46\u6027\u80fd\u5dee（\u5df2\u8fc7\u65f6）<\/td>\n<\/tr>\n
Stack<\/td>\n\u6808（\u7ee7\u627fVector）<\/td>\n\u2705<\/td>\n\u540e\u8fdb\u5148\u51fa（LIFO）<\/td>\n<\/tr>\n
CopyOnWriteArrayList<\/td>\n\u52a8\u6001\u6570\u7ec4 + \u5199\u65f6\u590d\u5236<\/td>\n\u2705<\/td>\n\u8bfb\u64cd\u4f5c\u65e0\u9501，\u5199\u64cd\u4f5c\u590d\u5236\u6574\u4e2a\u6570\u7ec4（\u9002\u5408\u8bfb\u591a\u5199\u5c11）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Set \u63a5\u53e3（\u65e0\u5e8f\u3001\u552f\u4e00）<\/p>\n\n\u7c7b\u540d\u6570\u636e\u7ed3\u6784\u7ebf\u7a0b\u5b89\u5168\u7279\u70b9<\/tr>\n\n\n\n\n\n\n
HashSet<\/td>\n\u54c8\u5e0c\u8868<\/td>\n\u274c<\/td>\n\u57fa\u4e8e\u00a0HashMap\u00a0\u5b9e\u73b0，\u67e5\u8be2\u6700\u5feb<\/td>\n<\/tr>\n
LinkedHashSet<\/td>\n\u54c8\u5e0c\u8868 + \u53cc\u5411\u94fe\u8868<\/td>\n\u274c<\/td>\n\u4fdd\u6301\u63d2\u5165\u987a\u5e8f<\/td>\n<\/tr>\n
TreeSet<\/td>\n\u7ea2\u9ed1\u6811<\/td>\n\u274c<\/td>\n\u5143\u7d20\u81ea\u52a8\u6392\u5e8f（\u9700\u5b9e\u73b0\u00a0Comparable）<\/td>\n<\/tr>\n
CopyOnWriteArraySet<\/td>\n\u6570\u7ec4 + \u5199\u65f6\u590d\u5236<\/td>\n\u2705<\/td>\n\u57fa\u4e8e\u00a0CopyOnWriteArrayList<\/td>\n<\/tr>\n
ConcurrentSkipListSet<\/td>\n\u8df3\u8868<\/td>\n\u2705<\/td>\n\u6709\u5e8f\u4e14\u7ebf\u7a0b\u5b89\u5168（\u9ad8\u5e76\u53d1\u573a\u666f）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Queue \u63a5\u53e3（\u961f\u5217）<\/p>\n\n\u7c7b\u540d\u6570\u636e\u7ed3\u6784\u7ebf\u7a0b\u5b89\u5168\u7279\u70b9<\/tr>\n\n\n\n\n\n
LinkedList<\/td>\n\u53cc\u5411\u94fe\u8868<\/td>\n\u274c<\/td>\n\u4f5c\u4e3a\u961f\u5217\u4f7f\u7528，\u652f\u6301FIFO\u64cd\u4f5c<\/td>\n<\/tr>\n
PriorityQueue<\/td>\n\u5806（\u5c0f\u9876\u5806）<\/td>\n\u274c<\/td>\n\u5143\u7d20\u6309\u4f18\u5148\u7ea7\u6392\u5e8f（\u81ea\u7136\u5e8f\u6216\u81ea\u5b9a\u4e49\u6bd4\u8f83\u5668）<\/td>\n<\/tr>\n
ArrayDeque<\/td>\n\u5faa\u73af\u6570\u7ec4<\/td>\n\u274c<\/td>\n\u53cc\u7aef\u961f\u5217，\u6027\u80fd\u4f18\u4e8e\u00a0LinkedList<\/td>\n<\/tr>\n
ConcurrentLinkedQueue<\/td>\n\u94fe\u8868<\/td>\n\u2705<\/td>\n\u65e0\u9501\u5e76\u53d1\u961f\u5217（CAS \u5b9e\u73b0）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

2）Map \u63a5\u53e3（\u952e\u503c\u5bf9\u96c6\u5408）<\/p>\n\n\u7c7b\u540d\u6570\u636e\u7ed3\u6784\u7ebf\u7a0b\u5b89\u5168\u7279\u70b9<\/tr>\n\n\n\n\n\n\n
HashMap<\/td>\n\u6570\u7ec4 + \u94fe\u8868\/\u7ea2\u9ed1\u6811<\/td>\n\u274c<\/td>\n\u6700\u5e38\u7528，\u5141\u8bb8\u00a0null\u00a0\u952e\/\u503c<\/td>\n<\/tr>\n
LinkedHashMap<\/td>\n\u54c8\u5e0c\u8868 + \u53cc\u5411\u94fe\u8868<\/td>\n\u274c<\/td>\n\u4fdd\u6301\u63d2\u5165\u987a\u5e8f\u6216\u8bbf\u95ee\u987a\u5e8f（LRU \u7f13\u5b58\u57fa\u7840）<\/td>\n<\/tr>\n
TreeMap<\/td>\n\u7ea2\u9ed1\u6811<\/td>\n\u274c<\/td>\n\u952e\u81ea\u52a8\u6392\u5e8f（\u57fa\u4e8e\u7ea2\u9ed1\u6811）<\/td>\n<\/tr>\n
Hashtable<\/td>\n\u54c8\u5e0c\u8868<\/td>\n\u2705<\/td>\n\u8fc7\u65f6，\u88ab\u00a0ConcurrentHashMap\u00a0\u53d6\u4ee3<\/td>\n<\/tr>\n
ConcurrentHashMap<\/td>\n\u6570\u7ec4 + \u94fe\u8868\/\u7ea2\u9ed1\u6811 + CAS<\/td>\n\u2705<\/td>\n\u9ad8\u5e76\u53d1\u63a8\u8350，\u5206\u6bb5\u9501\/\u6876\u9501\u4f18\u5316<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3）\u5982\u4f55\u9009\u62e9<\/p>\n

  • \n

    \u9700\u8981\u952e\u503c\u5bf9\u00a0\u2192\u00a0HashMap（\u975e\u5e76\u53d1）\u3001ConcurrentHashMap（\u5e76\u53d1）<\/p>\n<\/li>\n

  • \n

    \u9700\u8981\u6709\u5e8f\u00a0\u2192\u00a0LinkedHashMap（\u63d2\u5165\u5e8f）\u3001TreeMap（\u6392\u5e8f）<\/p>\n<\/li>\n

  • \n

    \u53bb\u91cd\u5b58\u50a8\u00a0\u2192\u00a0HashSet<\/p>\n<\/li>\n

  • \n

    \u961f\u5217\/\u6808\u00a0\u2192\u00a0ArrayDeque（\u53cc\u7aef\u961f\u5217）\u3001LinkedList（\u6808）<\/p>\n<\/li>\n

  • \n

    \u9ad8\u5e76\u53d1\u573a\u666f\u00a0\u2192\u00a0ConcurrentHashMap\u3001CopyOnWriteArrayList\u3001ConcurrentLinkedQueue<\/p>\n<\/li>\n

  • \n

    \u6392\u5e8f\u9700\u6c42\u00a0\u2192\u00a0TreeSet\u3001TreeMap\u3001PriorityQueue<\/p>\n<\/li>\n

    2.Java \u4e2d\u7684 List \u63a5\u53e3\u6709\u54ea\u4e9b\u5b9e\u73b0\u7c7b？（\u6613）<\/h2>\n

    Java \u4e2d\u7684 List \u63a5\u53e3\u662f Collection（\u5355\u5143\u7d20\u5bb9\u5668） \u7684\u5b50\u63a5\u53e3，\u8868\u793a\u6709\u5e8f\u3001\u53ef\u91cd\u590d\u7684\u96c6\u5408\u3002\u5e38\u89c1\u7684\u5b9e\u73b0\u7c7b\u5305\u62ec：ArrayList, LinkedList, Vector, Stack, CopyOnWriteArrayList\u51e0\u4e2a\u5b9e\u73b0\u7c7b\u3002<\/p>\n<\/p>\n\n\u5b9e\u73b0\u7c7b\u5e95\u5c42\u7ed3\u6784\u7ebf\u7a0b\u5b89\u5168\u9002\u7528\u573a\u666f<\/tr>\n\n\n\n\n\n\n
    ArrayList<\/td>\n\u52a8\u6001\u6570\u7ec4<\/td>\n\u274c<\/td>\n\u968f\u673a\u8bbf\u95ee\u591a，\u589e\u5220\u5c11<\/td>\n<\/tr>\n
    LinkedList<\/td>\n\u53cc\u5411\u94fe\u8868<\/td>\n\u274c<\/td>\n\u9891\u7e41\u589e\u5220，\u5c11\u91cf\u968f\u673a\u8bbf\u95ee<\/td>\n<\/tr>\n
    Vector<\/td>\n\u52a8\u6001\u6570\u7ec4<\/td>\n\u2714\ufe0f（synchronized）<\/td>\n\u9057\u7559\u4ee3\u7801，\u4e0d\u63a8\u8350\u65b0\u9879\u76ee<\/td>\n<\/tr>\n
    Stack<\/td>\n\u7ee7\u627f\u00a0Vector<\/td>\n\u2714\ufe0f<\/td>\n\u6808\u7ed3\u6784（\u63a8\u8350\u00a0Deque\u00a0\u66ff\u4ee3）<\/td>\n<\/tr>\n
    CopyOnWriteArrayList<\/td>\n\u52a8\u6001\u6570\u7ec4（COW）<\/td>\n\u2714\ufe0f<\/td>\n\u9ad8\u5e76\u53d1\u8bfb，\u4f4e\u5e76\u53d1\u5199<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    3.\u8bf4\u8bf4 Java \u4e2d HashMap \u7684\u539f\u7406？（\u4e2d）<\/h2>\n
  • HashMap\u57fa\u4e8e\u6570\u7ec4+\u94fe\u8868\/\u7ea2\u9ed1\u6811\u5b9e\u73b0\u3002<\/li>\n
  • \u5b58\u50a8\u952e\u503c\u5bf9\u65f6，\u5148\u8ba1\u7b97Key\u7684hashCode，\u518d\u6270\u52a8\u5904\u7406，\u7136\u540e(n-1)&hash\u786e\u5b9a\u6876\u4f4d\u7f6e\u3002<\/li>\n
  • \u5982\u679c\u6876\u4e3a\u7a7a\u76f4\u63a5\u653e；\u5982\u679c\u6876\u4e0d\u4e3a\u7a7a，\u5219\u904d\u5386\u94fe\u8868\/\u6811\u7528equals\u6bd4\u8f83Key：\u5b58\u5728\u5219\u8986\u76d6Value，\u4e0d\u5b58\u5728\u5219\u6dfb\u52a0\u65b0\u8282\u70b9（\u5c3e\u63d2\u6cd5）\u3002<\/li>\n
  • \u5f53\u94fe\u8868\u957f\u5ea6>8\u4e14\u6570\u7ec4\u957f\u5ea6>=64\u65f6\u94fe\u8868\u8f6c\u7ea2\u9ed1\u6811；\u6811\u8282\u70b9\u6570<=6\u65f6\u6811\u9000\u5316\u4e3a\u94fe\u8868\u3002<\/li>\n
  • \u5143\u7d20\u603b\u6570\u8d85\u8fc7\u5bb9\u91cf*\u8d1f\u8f7d\u56e0\u5b50(\u9ed8\u8ba40.75)\u65f6\u4f1a\u6269\u5bb9（\u901a\u5e382\u500d）\u5e76\u91cd\u65b0\u54c8\u5e0c\u3002<\/li>\n
  • \u67e5\u8be2\u65f6\u7c7b\u4f3c\u5b9a\u4f4d\u6876，\u518d\u904d\u5386\u94fe\u8868\/\u6811\u7528equals\u67e5\u627e\u3002<\/li>\n
  • \u5b83\u5141\u8bb8null\u952e\u503c\u3001\u65e0\u5e8f\u3001\u975e\u7ebf\u7a0b\u5b89\u5168，\u7406\u60f3\u60c5\u51b5\u4e0b\u64cd\u4f5c\u65f6\u95f4\u590d\u6742\u5ea6\u662fO(1)\u3002<\/li>\n

    （\u53c2\u8003AI）<\/p>\n

    \u6838\u5fc3\u539f\u7406：<\/p>\n

  • \n

    \u57fa\u4e8e\u54c8\u5e0c\u8868\u7684\u952e\u503c\u5bf9\u5b58\u50a8：<\/p>\n

      \n
    • \n

      \u4f7f\u7528\u6570\u7ec4（\u79f0\u4e3a\u6876\u6216bucket）\u4f5c\u4e3a\u4e3b\u5e72\u6765\u5b58\u50a8\u6570\u636e\u3002<\/p>\n<\/li>\n

    • \n

      \u6bcf\u4e2a\u6570\u7ec4\u5143\u7d20\u901a\u5e38\u662f\u4e00\u4e2a\u94fe\u8868\u7684\u5934\u8282\u70b9（Java 8\u540e\u53ef\u80fd\u53d8\u4e3a\u7ea2\u9ed1\u6811）\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

    • \n

      put\u64cd\u4f5c（\u5b58\u50a8\u952e\u503c\u5bf9）：<\/p>\n

        \n
      • \n

        \u8ba1\u7b97\u54c8\u5e0c\u503c：\u00a0\u8c03\u7528\u952e（Key）\u5bf9\u8c61\u7684hashCode()\u65b9\u6cd5\u8ba1\u7b97\u5176\u54c8\u5e0c\u503c\u3002<\/p>\n<\/li>\n

      • \n

        \u8ba1\u7b97\u6876\u4e0b\u6807：\u00a0\u5bf9\u54c8\u5e0c\u503c\u8fdb\u884c\u7279\u5b9a\u7684\u6270\u52a8\u8ba1\u7b97（Java 8\u4f7f\u7528(h = key.hashCode()) ^ (h >>> 16)\u6765\u51cf\u5c11\u78b0\u649e），\u7136\u540e\u901a\u8fc7(\u6570\u7ec4\u957f\u5ea6 – 1) & hash（\u7b49\u4ef7\u4e8ehash % \u6570\u7ec4\u957f\u5ea6，\u4f46\u6548\u7387\u66f4\u9ad8）\u786e\u5b9a\u952e\u503c\u5bf9\u5e94\u8be5\u5b58\u50a8\u5728\u54ea\u4e2a\u6876（\u6570\u7ec4\u7d22\u5f15）\u3002<\/p>\n<\/li>\n

      • \n

        \u5904\u7406\u78b0\u649e（\u54c8\u5e0c\u51b2\u7a81）：<\/p>\n

          \n
        • \n

          \u5982\u679c\u76ee\u6807\u6876\u4e3a\u7a7a：\u76f4\u63a5\u521b\u5efa\u4e00\u4e2a\u65b0\u8282\u70b9（\u5305\u542bKey, Value, hash）\u653e\u5165\u8be5\u6876\u3002<\/p>\n<\/li>\n

        • \n

          \u5982\u679c\u76ee\u6807\u6876\u4e0d\u4e3a\u7a7a（\u53d1\u751f\u78b0\u649e）：<\/p>\n

            \n
          • \n

            \u94fe\u8868：\u00a0\u904d\u5386\u6876\u4e2d\u7684\u94fe\u8868（\u6216\u6811），\u7528equals()\u65b9\u6cd5\u6bd4\u8f83\u65b0Key\u548c\u94fe\u8868\u4e2d\u6bcf\u4e2a\u8282\u70b9\u7684Key：<\/p>\n

              \n
            • \n

              \u5982\u679c\u627e\u5230\u76f8\u7b49\u7684Key：\u7528\u65b0Value\u8986\u76d6\u65e7Value\u3002<\/p>\n<\/li>\n

            • \n

              \u5982\u679c\u6ca1\u627e\u5230\u76f8\u7b49\u7684Key：\u5c06\u65b0\u8282\u70b9\u6dfb\u52a0\u5230\u94fe\u8868\u672b\u5c3e（Java 7\u662f\u5934\u63d2\u6cd5，Java 8\u6539\u4e3a\u5c3e\u63d2\u6cd5）\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

            • \n

              \u6811\u5316：\u00a0\u5f53\u94fe\u8868\u957f\u5ea6\u8d85\u8fc7\u9608\u503c（\u9ed8\u8ba4=8）\u4e14\u6570\u7ec4\u603b\u957f\u5ea6\u8fbe\u5230\u4e00\u5b9a\u5927\u5c0f（\u9ed8\u8ba4>=64）\u65f6，\u8be5\u94fe\u8868\u4f1a\u8f6c\u6362\u4e3a\u7ea2\u9ed1\u6811（TreeNode），\u4ee5\u63d0\u9ad8\u957f\u94fe\u8868\u4e0b\u7684\u67e5\u8be2\u6548\u7387（O(n) -> O(log n)）\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n

            • \n

              \u6269\u5bb9：\u00a0\u5982\u679c\u6dfb\u52a0\u5143\u7d20\u540e，\u6574\u4e2aHashMap\u4e2d\u5143\u7d20\u7684\u6570\u91cf（size）\u8d85\u8fc7\u4e86\u6570\u7ec4\u957f\u5ea6 * \u8d1f\u8f7d\u56e0\u5b50（\u9ed8\u8ba4\u8d1f\u8f7d\u56e0\u5b50loadFactor=0.75），\u5219\u89e6\u53d1\u6269\u5bb9（resize）：<\/p>\n

                \n
              • \n

                \u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u3001\u66f4\u5927\u7684\u6570\u7ec4（\u901a\u5e38\u662f\u539f\u957f\u5ea6\u76842\u500d）\u3002<\/p>\n<\/li>\n

              • \n

                \u91cd\u65b0\u54c8\u5e0c：\u00a0\u904d\u5386\u6240\u6709\u65e7\u7684\u6876\u548c\u94fe\u8868\/\u6811，\u6839\u636e\u65b0\u7684\u6570\u7ec4\u957f\u5ea6\u91cd\u65b0\u8ba1\u7b97\u6bcf\u4e2a\u8282\u70b9\u7684\u6876\u4e0b\u6807，\u5e76\u5c06\u8282\u70b9\u8fc1\u79fb\u5230\u65b0\u6570\u7ec4\u4e2d\u3002<\/p>\n<\/li>\n

              • \n

                \u6811\u9000\u5316：\u00a0\u5728\u8fc1\u79fb\u8fc7\u7a0b\u4e2d，\u5982\u679c\u6811\u4e2d\u5143\u7d20\u6570\u91cf\u51cf\u5c11\u5230\u9608\u503c\u4ee5\u4e0b（\u9ed8\u8ba4<=6），\u7ea2\u9ed1\u6811\u4f1a\u9000\u5316\u4e3a\u94fe\u8868\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n

              • \n

                get\u64cd\u4f5c（\u6839\u636e\u952e\u53d6\u503c）：<\/p>\n

                  \n
                • \n

                  \u8ba1\u7b97\u54c8\u5e0c\u503c & \u6876\u4e0b\u6807：\u00a0\u4e0eput\u64cd\u4f5c\u76f8\u540c\u7684\u65b9\u5f0f\u8ba1\u7b97Key\u7684\u54c8\u5e0c\u503c\u548c\u6876\u4e0b\u6807\u3002<\/p>\n<\/li>\n

                • \n

                  \u904d\u5386\u94fe\u8868\/\u6811：<\/p>\n

                    \n
                  • \n

                    \u5982\u679c\u76ee\u6807\u6876\u4e3a\u7a7a：\u8fd4\u56denull\u3002<\/p>\n<\/li>\n

                  • \n

                    \u5982\u679c\u76ee\u6807\u6876\u4e0d\u4e3a\u7a7a：<\/p>\n

                      \n
                    • \n

                      \u5982\u679c\u6876\u4e2d\u7b2c\u4e00\u4e2a\u8282\u70b9（\u94fe\u8868\u5934\u6216\u6811\u6839）\u7684Key\u5339\u914d（equals）：\u76f4\u63a5\u8fd4\u56de\u5176Value\u3002<\/p>\n<\/li>\n

                    • \n

                      \u5426\u5219，\u904d\u5386\u8be5\u6876\u4e0a\u7684\u94fe\u8868\u6216\u7ea2\u9ed1\u6811，\u7528equals()\u65b9\u6cd5\u6bd4\u8f83\u67e5\u627e\u7684Key\u548c\u8282\u70b9\u7684Key：<\/p>\n

                        \n
                      • \n

                        \u627e\u5230\u5339\u914d\u7684Key：\u8fd4\u56de\u5bf9\u5e94Value\u3002<\/p>\n<\/li>\n

                      • \n

                        \u904d\u5386\u5b8c\u672a\u627e\u5230：\u8fd4\u56denull\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n

                      • \n

                        \u5173\u952e\u7279\u6027：<\/p>\n

                          \n
                        • \n

                          \u65e0\u5e8f：\u00a0\u8fed\u4ee3\u987a\u5e8f\u4e0d\u4fdd\u8bc1\u4e0e\u63d2\u5165\u987a\u5e8f\u4e00\u81f4，\u4e5f\u4e0d\u4fdd\u8bc1\u987a\u5e8f\u4e0d\u53d8\u3002<\/p>\n<\/li>\n

                        • \n

                          \u5141\u8bb8null\u952e\u548cnull\u503c\u3002<\/p>\n<\/li>\n

                        • \n

                          \u975e\u7ebf\u7a0b\u5b89\u5168：\u00a0\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u5e76\u53d1\u4fee\u6539\u53ef\u80fd\u5bfc\u81f4\u6b7b\u5faa\u73af（Java 7\u5934\u63d2\u6cd5\u5bfc\u81f4）\u3001\u6570\u636e\u9519\u4e71\u6216ConcurrentModificationException\u3002\u9700\u8981\u5916\u90e8\u540c\u6b65（\u5982Collections.synchronizedMap）\u6216\u4f7f\u7528ConcurrentHashMap\u3002<\/p>\n<\/li>\n

                        • \n

                          \u6027\u80fd：\u00a0\u5728\u7406\u60f3\u60c5\u51b5\u4e0b（\u65e0\u78b0\u649e\u6216\u78b0\u649e\u5c11），get\u548cput\u64cd\u4f5c\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u63a5\u8fd1O(1)\u3002\u6700\u574f\u60c5\u51b5（\u6240\u6709\u952e\u90fd\u78b0\u649e\u5230\u540c\u4e00\u4e2a\u6876，\u9000\u5316\u4e3a\u94fe\u8868）\u662fO(n)，\u6811\u5316\u540e\u63d0\u5347\u4e3aO(log n)\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

                          4.Java \u4e2d ConcurrentHashMap 1.7 \u548c 1.8 \u4e4b\u95f4\u6709\u54ea\u4e9b\u533a\u522b？（\u4e2d）<\/h2>\n

                          Java 7 \u7684 ConcurrentHashMap\u00a0\u91c7\u7528\u5206\u6bb5\u9501（Segment）\u5b9e\u73b0，\u9ed8\u8ba416\u4e2a\u6bb5，\u6bcf\u4e2a\u6bb5\u72ec\u7acb\u52a0\u9501，\u5141\u8bb8\u5e76\u53d1\u5199\u5165\u4e0d\u540c\u6bb5，\u4f46\u6269\u5bb9\u548c\u54c8\u5e0c\u51b2\u7a81\u4ecd\u53d7\u6bb5\u9650\u5236\u3002Java 8 \u5219\u629b\u5f03\u5206\u6bb5\u9501，\u6539\u7528 CAS + synchronized\u00a0\u5bf9\u5355\u4e2a\u6876（Node）\u52a0\u9501，\u5e76\u5f15\u5165\u7ea2\u9ed1\u6811\u4f18\u5316\u54c8\u5e0c\u51b2\u7a81，\u6269\u5bb9\u65f6\u652f\u6301\u591a\u7ebf\u7a0b\u534f\u540c\u8fc1\u79fb，\u5e76\u53d1\u5ea6\u66f4\u9ad8\u4e14\u5185\u5b58\u5f00\u9500\u66f4\u5c0f\u3002\u6b64\u5916，Java 8 \u65b0\u589e\u51fd\u6570\u5f0f API（\u5982 forEach\u3001compute），\u5e76\u4f18\u5316\u4e86\u7edf\u8ba1\u65b9\u6cd5（\u5982 size()\u00a0\u4f7f\u7528 CounterCell\u00a0\u5206\u6563\u8ba1\u6570\u7ade\u4e89）\u30021.8 \u7684\u5b9e\u73b0\u66f4\u7b80\u6d01\u9ad8\u6548，\u9501\u7c92\u5ea6\u66f4\u7ec6，\u9002\u5e94\u66f4\u9ad8\u5e76\u53d1\u573a\u666f\u3002<\/p>\n<\/p>\n\n\u7279\u6027JDK 1.7JDK 1.8<\/tr>\n\n\n\n\n\n\n\n
                          \u6570\u636e\u7ed3\u6784<\/td>\nSegment + HashEntry （\u6570\u7ec4+\u94fe\u8868）<\/td>\nNode \u6570\u7ec4 + \u94fe\u8868\/\u7ea2\u9ed1\u6811\u00a0<\/td>\n<\/tr>\n
                          \u9501\u7c92\u5ea6<\/td>\nSegment \u7ea7\u522b（\u7c97\u7c92\u5ea6）<\/td>\n\u6876\u7ea7\u522b（\u7ec6\u7c92\u5ea6）<\/td>\n<\/tr>\n
                          \u9501\u5b9e\u73b0<\/td>\nReentrantLock<\/td>\nCAS + synchronized\u00a0<\/td>\n<\/tr>\n
                          \u54c8\u5e0c\u51b2\u7a81\u5904\u7406<\/td>\n\u94fe\u8868（O(n)）<\/td>\n\u94fe\u8868\u8f6c\u7ea2\u9ed1\u6811（O(log n)）<\/td>\n<\/tr>\n
                          \u6269\u5bb9<\/td>\n\u5404 Segment \u72ec\u7acb\u6269\u5bb9<\/td>\n\u591a\u7ebf\u7a0b\u534f\u540c\u8fc1\u79fb\u6570\u636e<\/td>\n<\/tr>\n
                          \u9002\u7528\u573a\u666f<\/td>\n\u5199\u5c11\u8bfb\u591a<\/td>\n\u9ad8\u5e76\u53d1\u5199\u5165\u3001\u5927\u6570\u636e\u91cf\u00a0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                          5.\u4e3a\u4ec0\u4e48 JDK 1.8 \u5bf9 HashMap \u8fdb\u884c\u4e86\u7ea2\u9ed1\u6811\u7684\u6539\u52a8？\u00a0（\u4e2d）<\/h2>\n

                          JDK 1.8 \u5728 HashMap \u4e2d\u5f15\u5165\u7ea2\u9ed1\u6811，\u4e3b\u8981\u662f\u4e3a\u4e86\u89e3\u51b3\u54c8\u5e0c\u51b2\u7a81\u4e25\u91cd\u65f6\u957f\u94fe\u8868\u5bfc\u81f4\u7684\u67e5\u8be2\u6027\u80fd\u9000\u5316（O(n)）\u95ee\u9898\u3002\u5f53\u5355\u4e2a\u6876\u7684\u94fe\u8868\u957f\u5ea6>=8\u4e14\u6570\u7ec4\u957f\u5ea6>=64\u65f6，\u94fe\u8868\u4f1a\u8f6c\u6362\u4e3a\u7ea2\u9ed1\u6811，\u5c06\u6700\u574f\u60c5\u51b5\u4e0b\u7684\u64cd\u4f5c\u65f6\u95f4\u590d\u6742\u5ea6\u4ece O(n) \u4f18\u5316\u5230 O(log n)，\u663e\u8457\u63d0\u5347\u4e86\u9ad8\u51b2\u7a81\u573a\u666f\u4e0b\u7684\u6027\u80fd\u548c\u5bb9\u5668\u7684\u6297\u653b\u51fb（\u9632\u54c8\u5e0c\u78b0\u649eDoS）\u80fd\u529b\u3002\u5f53\u94fe\u8868\u957f\u5ea6<=6\u65f6，\u7ea2\u9ed1\u6811\u4f1a\u91cd\u65b0\u9000\u5316\u4e3a\u94fe\u8868，\u4fdd\u8bc1\u4f4e\u51b2\u7a81\u65f6\u94fe\u8868\u7684\u6548\u7387\u4f18\u52bf\u3002<\/p>\n<\/p>\n\n\u6570\u636e\u7ed3\u6784\u67e5\u627e\u65f6\u95f4\u590d\u6742\u5ea6\u63d2\u5165\u65f6\u95f4\u590d\u6742\u5ea6\u9002\u7528\u573a\u666f<\/tr>\n\n\n\n
                          \u94fe\u8868<\/td>\nO(n)<\/td>\nO(1)<\/td>\n\u51b2\u7a81\u8f83\u5c11<\/td>\n<\/tr>\n
                          \u7ea2\u9ed1\u6811<\/td>\nO(log n)<\/td>\nO(log n)<\/td>\n\u51b2\u7a81\u4e25\u91cd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
                            \n
                          • \n

                            \u4e3a\u4ec0\u4e48\u9608\u503c\u662f8？<\/p>\n

                              \n
                            • \n

                              \u6839\u636e\u6cca\u677e\u5206\u5e03，\u54c8\u5e0c\u51b2\u7a81\u8fbe\u52308\u7684\u6982\u7387\u5c0f\u4e8e\u5343\u4e07\u5206\u4e4b\u4e00<\/p>\n<\/li>\n

                            • \n

                              \u6811\u8282\u70b9\u5360\u7528\u7a7a\u95f4\u662f\u666e\u901a\u8282\u70b9\u7684\u4e24\u500d，\u5e73\u8861\u6027\u80fd\u4e0e\u5f00\u9500<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

                            • \n

                              \u4e3a\u4ec0\u4e48\u9700\u8981\u6700\u5c0f\u6811\u5316\u5bb9\u91cf64？<\/p>\n

                                \n
                              • \n

                                \u907f\u514d\u65e9\u671f\u5c0f\u89c4\u6a21\u54c8\u5e0c\u8868\u7684\u4e0d\u5fc5\u8981\u6811\u5316<\/p>\n<\/li>\n

                              • \n

                                \u4f18\u5148\u901a\u8fc7\u6570\u7ec4\u6269\u5bb9\u5206\u6563\u8282\u70b9<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                6.JDK 1.8 \u5bf9 HashMap \u9664\u4e86\u7ea2\u9ed1\u6811\u8fd8\u8fdb\u884c\u4e86\u54ea\u4e9b\u6539\u52a8？\u00a0（\u4e2d）<\/h2>\n

                                1）\u54c8\u5e0c\u51fd\u6570\u4f18\u5316<\/p>\n

                                  \n
                                • \n

                                  \u6270\u52a8\u7b97\u6cd5\u5347\u7ea7：\u8ba1\u7b97\u7d22\u5f15\u65f6，\u65b0\u589e\u4e00\u6b65\u00a0hash = key.hashCode() ^ (key.hashCode() >>> 16)，\u5c06\u9ad816\u4f4d\u4e0e\u4f4e16\u4f4d\u5f02\u6216\u6df7\u5408，\u663e\u8457\u51cf\u5c11\u54c8\u5e0c\u51b2\u7a81，\u4f7f\u5143\u7d20\u5206\u5e03\u66f4\u5747\u53002410\u3002<\/p>\n<\/li>\n<\/ul>\n

                                  2）\u94fe\u8868\u63d2\u5165\u65b9\u5f0f\u6539\u53d8<\/p>\n

                                    \n
                                  • \n

                                    \u5934\u63d2\u6cd5 \u2192 \u5c3e\u63d2\u6cd5：JDK 1.7 \u4f7f\u7528\u5934\u63d2\u6cd5（\u6613\u5bfc\u81f4\u591a\u7ebf\u7a0b\u6269\u5bb9\u6b7b\u5faa\u73af），1.8 \u6539\u4e3a\u5c3e\u63d2\u6cd5，\u907f\u514d\u94fe\u8868\u5012\u7f6e，\u63d0\u5347\u5e76\u53d1\u5b89\u5168\u6027（\u5c3d\u7ba1\u4ecd\u975e\u7ebf\u7a0b\u5b89\u5168）710\u3002<\/p>\n<\/li>\n<\/ul>\n

                                    3）\u6269\u5bb9\u673a\u5236\u91cd\u6784<\/p>\n

                                      \n
                                    • \n

                                      \u4f4d\u7f6e\u91cd\u8ba1\u7b97\u4f18\u5316：\u6269\u5bb9\u65f6\u4e0d\u518d\u5168\u91cf\u91cd\u65b0\u54c8\u5e0c，\u800c\u662f\u901a\u8fc7\u00a0(e.hash & oldCap) == 0\u00a0\u5224\u65ad\u5143\u7d20\u4f4d\u7f6e：<\/p>\n

                                        \n
                                      • \n

                                        \u82e5\u4e3a\u00a00，\u7d22\u5f15\u4e0d\u53d8；<\/p>\n<\/li>\n

                                      • \n

                                        \u82e5\u4e3a\u00a01，\u65b0\u7d22\u5f15 = \u539f\u7d22\u5f15 + \u65e7\u5bb9\u91cf479\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

                                      • \n

                                        \u6548\u7387\u63d0\u5347：\u907f\u514d\u4e86\u91cd\u65b0\u8ba1\u7b97\u54c8\u5e0c，\u4ec5\u9700\u4e00\u6b21\u4f4d\u64cd\u4f5c，\u6269\u5bb9\u6027\u80fd\u5927\u5e45\u63d0\u9ad8\u3002<\/p>\n<\/li>\n<\/ul>\n

                                        4）\u6811\u5316\u6761\u4ef6\u7cbe\u7ec6\u5316<\/p>\n

                                          \n
                                        • \n

                                          \u94fe\u8868\u8f6c\u7ea2\u9ed1\u6811\u9700\u540c\u65f6\u6ee1\u8db3：<\/p>\n

                                            \n
                                          • \n

                                            \u94fe\u8868\u957f\u5ea6 \u2265\u00a0TREEIFY_THRESHOLD（\u9ed8\u8ba48）；<\/p>\n<\/li>\n

                                          • \n

                                            \u6876\u6570\u7ec4\u5bb9\u91cf \u2265\u00a0MIN_TREEIFY_CAPACITY（\u9ed8\u8ba464）\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

                                          • \n

                                            \u5426\u5219\u4f18\u5148\u6269\u5bb9\u800c\u975e\u6811\u5316，\u907f\u514d\u5c0f\u8868\u4e0d\u5fc5\u8981\u7684\u6811\u7ed3\u6784\u5f00\u9500569\u3002<\/p>\n<\/li>\n<\/ul>\n

                                            5）\u5e76\u53d1\u6027\u80fd\u589e\u5f3a<\/p>\n

                                              \n
                                            • \n

                                              \u867d\u4ecd\u975e\u7ebf\u7a0b\u5b89\u5168，\u4f46\u5185\u90e8\u5b9e\u73b0\u91c7\u7528\u00a0CAS \u601d\u60f3（\u5982\u00a0size\u00a0\u7edf\u8ba1\u901a\u8fc7\u00a0CounterCell\u00a0\u5206\u6563\u7ade\u4e89），\u51cf\u5c11\u9501\u51b2\u7a8112\u3002<\/p>\n<\/li>\n<\/ul>\n\n\u7279\u6027JDK 1.7JDK 1.8<\/tr>\n\n\n\n\n\n\n
                                              \u6570\u636e\u7ed3\u6784<\/td>\n\u6570\u7ec4 + \u94fe\u8868<\/td>\n\u6570\u7ec4 + \u94fe\u8868 + \u7ea2\u9ed1\u6811<\/td>\n<\/tr>\n
                                              \u54c8\u5e0c\u8ba1\u7b97<\/td>\n\u76f4\u63a5\u53d6\u6a21<\/td>\n\u9ad8\u4f4d\u6270\u52a8\u540e\u53d6\u6a21<\/td>\n<\/tr>\n
                                              \u63d2\u5165\u65b9\u5f0f<\/td>\n\u5934\u63d2\u6cd5<\/td>\n\u5c3e\u63d2\u6cd5<\/td>\n<\/tr>\n
                                              \u6269\u5bb9\u5f00\u9500<\/td>\n\u5168\u91cf\u91cd\u54c8\u5e0c<\/td>\n\u4f4d\u8fd0\u7b97\u5224\u65ad\u65b0\u4f4d\u7f6e<\/td>\n<\/tr>\n
                                              \u6811\u5316\u903b\u8f91<\/td>\n\u65e0<\/td>\n\u957f\u5ea6 \u22658 \u4e14\u5bb9\u91cf \u226564 \u624d\u6811\u5316<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                              7.\u4e3a\u4ec0\u4e48 Java \u4e2d HashMap \u7684\u9ed8\u8ba4\u8d1f\u8f7d\u56e0\u5b50\u662f 0.75？（\u4e2d）<\/h2>\n

                                              Java \u4e2d\u00a0HashMap\u00a0\u7684\u9ed8\u8ba4\u8d1f\u8f7d\u56e0\u5b50（Load Factor）\u8bbe\u4e3a\u00a00.75\u00a0\u662f\u7ecf\u8fc7\u4e25\u8c28\u6743\u8861\u7684\u7ed3\u679c，\u4e3b\u8981\u76ee\u7684\u662f\u5728\u00a0\u65f6\u95f4\u6548\u7387（\u67e5\u8be2\u6027\u80fd）\u00a0\u548c\u00a0\u7a7a\u95f4\u6548\u7387（\u5185\u5b58\u5229\u7528\u7387）\u00a0\u4e4b\u95f4\u53d6\u5f97\u6700\u4f73\u5e73\u8861\u3002\u65e2\u4fdd\u969c\u64cd\u4f5c\u6548\u7387，\u53c8\u907f\u514d\u5185\u5b58\u6d6a\u8d39，\u9002\u5408\u7edd\u5927\u591a\u6570\u573a\u666f\u3002<\/p>\n<\/p>\n\n\u8d1f\u8f7d\u56e0\u5b50\u67e5\u8be2\u6027\u80fd\u5185\u5b58\u5229\u7528\u7387\u9002\u7528\u573a\u666f<\/tr>\n\n\n\n\n
                                              0.5<\/td>\n\u2705 \u6781\u9ad8（\u51b2\u7a81\u5c11）<\/td>\n\u274c \u4f4e（\u6d6a\u8d39 50%）<\/td>\n\u5185\u5b58\u5145\u8db3\u3001\u5b9e\u65f6\u7cfb\u7edf<\/td>\n<\/tr>\n
                                              0.75<\/td>\n\u2705\u5e73\u8861（\u63a5\u8fd1 O(1)）<\/td>\n\u2705 \u8f83\u9ad8（\u95f2\u7f6e 25%）<\/td>\n\u9ed8\u8ba4\u573a\u666f<\/td>\n<\/tr>\n
                                              1.0<\/td>\n\u274c \u5dee（\u51b2\u7a81\u9891\u7e41）<\/td>\n\u2705 \u9ad8（\u65e0\u6d6a\u8d39）<\/td>\n\u5185\u5b58\u7d27\u5f20\u3001\u4f4e\u9891\u8bbf\u95ee<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                              8.Java \u4e2d HashMap \u7684\u6269\u5bb9\u673a\u5236\u662f\u600e\u6837\u7684？（\u4e2d）\u00a0\u00a0 \u00a0<\/h2>\n

                                              HashMap \u5728\u5143\u7d20\u6570\u8d85\u8fc7\u00a0\u5bb9\u91cf\u00d70.75\u00a0\u65f6\u89e6\u53d1\u6269\u5bb9，\u65b0\u5bb9\u91cf\u4e3a\u5f53\u524d\u5bb9\u91cf\u7684\u4e24\u500d\u3002JDK 1.8\u00a0\u540e\u901a\u8fc7\u00a0\u9ad8\u4f4d\u6bd4\u7279\u5224\u65ad\u8282\u70b9\u65b0\u4f4d\u7f6e（\u514d\u91cd\u7b97\u54c8\u5e0c），\u7528\u00a0\u5c3e\u63d2\u6cd5\u62c6\u5206\u94fe\u8868\/\u6811\u00a0\u8fc1\u79fb\u6570\u636e，\u907f\u514d\u6b7b\u5faa\u73af\u5e76\u63d0\u5347\u6548\u7387\u3002<\/p>\n<\/p>\n

                                              \u5177\u4f53\u6b65\u9aa4：<\/p>\n

                                            • \n

                                              \u521b\u5efa\u65b0\u6570\u7ec4： \u65b0\u5bb9\u91cf =\u00a0\u65e7\u5bb9\u91cf\u7684 2 \u500d（\u5982 16 \u2192 32），\u4fdd\u8bc1\u5bb9\u91cf\u59cb\u7ec8\u4e3a 2 \u7684\u5e42（\u4fbf\u4e8e\u4f4d\u8fd0\u7b97\u4f18\u5316）\u3002<\/p>\n<\/li>\n

                                            • \n

                                              \u8fc1\u79fb\u6570\u636e： \u904d\u5386\u65e7\u6570\u7ec4\u7684\u6bcf\u4e2a\u6876（Bucket），\u91cd\u65b0\u5206\u914d\u6bcf\u4e2a\u8282\u70b9\u5230\u65b0\u6570\u7ec4：<\/p>\n

                                                \n
                                              • \n

                                                JDK 1.8 \u4f18\u5316\u5173\u952e：\u901a\u8fc7\u00a0e.hash & oldCap(\u539f\u6570\u7ec4\u957f\u5ea6\u7684\u4e8c\u8fdb\u5236\u6570)\u00a0\u9ad8\u4f4d\u6bd4\u7279\u5224\u65ad\u4f4d\u7f6e（\u65e0\u9700\u91cd\u7b97\u54c8\u5e0c，\u598216\u4e3a10000，\u770b e.hash \u7b2c\u4e94\u4f4d\u662f\u5426\u4e3a1）：<\/p>\n

                                                  \n
                                                • \n

                                                  \u7ed3\u679c\u4e3a 0\u00a0\u2192 \u8282\u70b9\u7559\u5728\u539f\u7d22\u5f15\u4f4d\u7f6e（index\u00a0\u4e0d\u53d8）\u3002<\/p>\n<\/li>\n

                                                • \n

                                                  \u7ed3\u679c\u4e3a 1\u00a0\u2192 \u8282\u70b9\u8fc1\u79fb\u5230\u65b0\u7d22\u5f15 = \u539f\u7d22\u5f15 + \u65e7\u5bb9\u91cf（index + oldCap）\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

                                                • \n

                                                  \u94fe\u8868\u62c6\u5206：\u82e5\u6876\u4e2d\u662f\u94fe\u8868，\u6309\u9ad8\u4f4d\u7ed3\u679c\u62c6\u5206\u4e3a\u4e24\u4e2a\u94fe\u8868（\u539f\u4f4d\u7f6e\u94fe\u8868 + \u65b0\u4f4d\u7f6e\u94fe\u8868），\u4fdd\u6301\u987a\u5e8f（\u5c3e\u63d2\u6cd5）\u3002<\/p>\n<\/li>\n

                                                • \n

                                                  \u7ea2\u9ed1\u6811\u62c6\u5206：\u82e5\u6876\u4e2d\u662f\u7ea2\u9ed1\u6811，\u6309\u76f8\u540c\u903b\u8f91\u62c6\u5206，\u82e5\u62c6\u5206\u540e\u8282\u70b9\u6570 \u22646，\u5219\u9000\u5316\u4e3a\u94fe\u8868\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

                                                • \n

                                                  \u66f4\u65b0\u5f15\u7528： \u5c06\u65b0\u6570\u7ec4\u8bbe\u7f6e\u4e3a\u00a0HashMap\u00a0\u7684\u5e95\u5c42\u5b58\u50a8，\u65e7\u6570\u7ec4\u88ab GC \u56de\u6536\u3002<\/p>\n<\/li>\n

                                                • \n

                                                  \u91cd\u65b0\u8ba1\u7b97\u9608\u503c： \u65b0\u9608\u503c = \u65b0\u5bb9\u91cf \u00d7 \u8d1f\u8f7d\u56e0\u5b50（\u5982 32 \u00d7 0.75 = 24）\u3002<\/p>\n<\/li>\n\n\u64cd\u4f5cJDK 1.7JDK 1.8<\/tr>\n\n\n\n\n
                                                  \u54c8\u5e0c\u91cd\u8ba1\u7b97<\/td>\n\u6240\u6709\u8282\u70b9\u91cd\u65b0\u8ba1\u7b97\u00a0hash<\/td>\n\u514d\u91cd\u7b97（\u7528\u00a0e.hash & oldCap\u00a0\u5224\u65ad）<\/td>\n<\/tr>\n
                                                  \u94fe\u8868\u8fc1\u79fb<\/td>\n\u5934\u63d2\u6cd5（\u53ef\u80fd\u6b7b\u5faa\u73af）<\/td>\n\u5c3e\u63d2\u6cd5（\u907f\u514d\u95ed\u73af）<\/td>\n<\/tr>\n
                                                  \u8fc1\u79fb\u6548\u7387<\/td>\n\u5355\u8282\u70b9\u904d\u5386\u8fc1\u79fb<\/td>\n\u6309\u9ad8\u4f4d\u7ed3\u679c\u6279\u91cf\u8fc1\u79fb\u94fe\u8868\/\u6811<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                  9.\u4e3a\u4ec0\u4e48 HashMap \u5728 Java \u4e2d\u6269\u5bb9\u65f6\u91c7\u7528 2 \u7684 n \u6b21\u65b9\u500d？（\u4e2d）<\/h2>\n

                                                  HashMap \u91c7\u7528 2 \u7684 n \u6b21\u65b9\u5bb9\u91cf，\u6838\u5fc3\u662f\u901a\u8fc7\u00a0(n-1) & hash\u00a0\u4f4d\u8fd0\u7b97\u66ff\u4ee3\u53d6\u6a21，\u6781\u5927\u63d0\u5347\u8ba1\u7b97\u6876\u4e0b\u6807\u7684\u6548\u7387；\u540c\u65f6\u652f\u6301\u6269\u5bb9\u65f6\u514d\u91cd\u7b97\u54c8\u5e0c（\u4ec5\u9700\u9ad8\u4f4d\u6bd4\u7279\u5224\u65ad\u65b0\u4f4d\u7f6e\u00a0n & hash\u00a0），\u964d\u4f4e\u8fc1\u79fb\u5f00\u9500，\u5e76\u63d0\u5347\u54c8\u5e0c\u5206\u5e03\u7684\u5747\u5300\u6027，\u662f\u6027\u80fd\u4e0e\u8bbe\u8ba1\u4f18\u96c5\u6027\u7684\u53cc\u91cd\u4f18\u5316\u3002<\/p>\n<\/p>\n

                                                  \u5177\u4f53\u5206\u6790：<\/p>\n

                                                • \n

                                                  \u9ad8\u6548\u8ba1\u7b97\u6876\u4e0b\u6807（\u6838\u5fc3\u4f18\u5316）<\/p>\n

                                                    \n
                                                  • \n

                                                    \u5b9a\u4f4d\u6876\u4e0b\u6807\u516c\u5f0f：index = (n – 1) & hash（n\u00a0\u4e3a\u6570\u7ec4\u957f\u5ea6）\u3002<\/p>\n<\/li>\n

                                                  • \n

                                                    \u5f53\u00a0n\u00a0\u4e3a 2 \u7684\u5e42\u65f6：n – 1\u00a0\u7684\u4e8c\u8fdb\u5236\u5168\u4e3a\u00a01（\u4f8b\u5982\u00a016-1=15 \u2192 1111）\u3002<\/p>\n<\/li>\n

                                                  • \n

                                                    \u4f4d\u8fd0\u7b97\u66ff\u4ee3\u53d6\u6a21：(n-1) & hash\u00a0\u7b49\u4ef7\u4e8e\u00a0hash % n，\u4f46\u4f4d\u8fd0\u7b97\u6bd4\u53d6\u6a21\u5feb 10 \u500d\u4ee5\u4e0a（CPU \u6307\u4ee4\u7ea7\u4f18\u5316）\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

                                                  • \n

                                                    \u6269\u5bb9\u65f6\u514d\u91cd\u7b97\u54c8\u5e0c（JDK 1.8 \u4f18\u5316）<\/p>\n

                                                      \n
                                                    • \n

                                                      \u6269\u5bb9\u540e\u65b0\u4e0b\u6807 =\u00a0\u539f\u4f4d\u7f6e\u00a0\u6216\u00a0\u539f\u4f4d\u7f6e + \u65e7\u5bb9\u91cf（index\u00a0\u6216\u00a0index + oldCap）\u3002<\/p>\n<\/li>\n

                                                    • \n

                                                      \u5224\u65ad\u903b\u8f91：\u76f4\u63a5\u901a\u8fc7\u00a0e.hash & oldCap\u00a0\u7684\u9ad8\u4f4d\u6bd4\u7279（0 \u6216 1）\u51b3\u5b9a\u4f4d\u7f6e，\u65e0\u9700\u91cd\u65b0\u8ba1\u7b97\u00a0hash\u00a0\u503c\u3002<\/p>\n<\/li>\n

                                                    • \n

                                                      \u4f8b\u5982：\u65e7\u5bb9\u91cf\u00a016（\u4e8c\u8fdb\u5236\u00a010000），\u82e5\u00a0e.hash & 16 = 0\u00a0\u5219\u4f4d\u7f6e\u4e0d\u53d8，\u5426\u5219\u65b0\u4f4d\u7f6e = \u539f\u4f4d\u7f6e + 16\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n

                                                    • \n

                                                      \u51cf\u5c11\u54c8\u5e0c\u51b2\u7a81，\u5206\u5e03\u66f4\u5747\u5300<\/p>\n

                                                        \n
                                                      • \n

                                                        \u5982\u679c\u00a0length\u00a0\u4e0d\u662f 2 \u7684\u5e42\u6b21\u65b9，(length – 1)\u00a0\u7684\u4e8c\u8fdb\u5236\u4f1a\u6709\u00a00\u00a0\u4f4d（\u5982\u00a0length = 15\u00a0\u2192\u00a01110），\u5bfc\u81f4\u67d0\u4e9b\u00a0index\u00a0\u6c38\u8fdc\u65e0\u6cd5\u88ab\u8ba1\u7b97\u5230（\u59820001），\u589e\u52a0\u54c8\u5e0c\u51b2\u7a81\u6982\u7387\u3002<\/p>\n<\/li>\n

                                                      • \n

                                                        2 \u7684\u5e42\u6b21\u65b9\u957f\u5ea6\u80fd\u66f4\u5747\u5300\u5206\u5e03\u5143\u7d20（(n-1) & hash），\u786e\u4fdd\u54c8\u5e0c\u503c\u7684\u6240\u6709\u6709\u6548\u4f4d\u90fd\u53c2\u4e0e\u8ba1\u7b97，\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n\n\u7279\u60272^n \u5bb9\u91cf\u975e 2^n \u5bb9\u91cf<\/tr>\n\n\n\n\n\n
                                                        \u8ba1\u7b97\u6876\u4f4d\u7f6e\u901f\u5ea6<\/td>\n1 CPU \u5468\u671f<\/td>\n10+ CPU \u5468\u671f<\/td>\n<\/tr>\n
                                                        \u54c8\u5e0c\u5206\u5e03\u5747\u5300\u6027<\/td>\n\u6700\u4f18（\u5168\u4f4e\u4f4d\u53c2\u4e0e）<\/td>\n\u90e8\u5206\u6876\u4f4d\u4e0d\u53ef\u7528<\/td>\n<\/tr>\n
                                                        \u6269\u5bb9\u5143\u7d20\u8fc1\u79fb<\/td>\n\u4f4d\u5224\u65ad（O(1)）<\/td>\n\u5168\u91cf\u91cd\u54c8\u5e0c（O(n)）<\/td>\n<\/tr>\n
                                                        \u5185\u5b58\u5229\u7528\u7387<\/td>\n100% \u6709\u6548<\/td>\n\u6700\u9ad8 87.5%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                        10.\u6570\u7ec4\u548c\u94fe\u8868\u5728 Java \u4e2d\u7684\u533a\u522b\u662f\u4ec0\u4e48？（\u4e2d）<\/h2>\n

                                                        \u6570\u7ec4\u57fa\u4e8e\u8fde\u7eed\u7684\u5185\u5b58\u5757，\u4e14\u5927\u5c0f\u56fa\u5b9a，\u652f\u6301\u00a0O(1) \u968f\u673a\u8bbf\u95ee\u4f46\u589e\u5220\u6210\u672c\u9ad8；\u94fe\u8868\u57fa\u4e8e\u8282\u70b9，\u901a\u8fc7\u6307\u9488\u52a8\u6001\u94fe\u63a5，\u589e\u5220 O(1)\u00a0\u4f46\u8bbf\u95ee\u9700 O(n)\u3002\u5728 Java \u4e2d，ArrayList\u00a0\u57fa\u4e8e\u6570\u7ec4\u9002\u5408\u8bfb\u591a\u5199\u5c11，LinkedList\u00a0\u57fa\u4e8e\u94fe\u8868\u9002\u5408\u9891\u7e41\u589e\u5220\u573a\u666f\u3002<\/p>\n<\/p>\n\n\u7279\u6027\u6570\u7ec4\u94fe\u8868<\/tr>\n\n\n\n\n\n\n\n
                                                        \u5185\u5b58\u7ed3\u6784<\/td>\n\u8fde\u7eed\u5185\u5b58\u5757<\/td>\n\u975e\u8fde\u7eed\u5185\u5b58（\u8282\u70b9\u5206\u6563\u5b58\u50a8）<\/td>\n<\/tr>\n
                                                        \u8bbf\u95ee\u6548\u7387<\/td>\nO(1)（\u901a\u8fc7\u4e0b\u6807\u76f4\u63a5\u5bfb\u5740）<\/td>\nO(n)（\u9700\u4ece\u5934\u904d\u5386）<\/td>\n<\/tr>\n
                                                        \u589e\u5220\u6548\u7387<\/td>\nO(n)（\u9700\u79fb\u52a8\u540e\u7eed\u5143\u7d20）<\/td>\nO(1)（\u4ec5\u4fee\u6539\u6307\u9488，\u65e0\u9700\u79fb\u52a8）<\/td>\n<\/tr>\n
                                                        \u5185\u5b58\u5360\u7528<\/td>\n\u56fa\u5b9a\u5927\u5c0f（\u521d\u59cb\u5316\u540e\u4e0d\u53ef\u53d8）<\/td>\n\u52a8\u6001\u6269\u5bb9（\u6309\u9700\u589e\u5220\u8282\u70b9）<\/td>\n<\/tr>\n
                                                        \u5185\u5b58\u5f00\u9500<\/td>\n\u4ec5\u5b58\u50a8\u6570\u636e<\/td>\n\u989d\u5916\u5b58\u50a8\u6307\u9488（next\/prev）<\/td>\n<\/tr>\n
                                                        \u9002\u7528\u573a\u666f<\/td>\n\u9891\u7e41\u968f\u673a\u8bbf\u95ee\u3001\u6570\u636e\u91cf\u56fa\u5b9a<\/td>\n\u9891\u7e41\u589e\u5220\u3001\u6570\u636e\u91cf\u52a8\u6001\u53d8\u5316<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                        \u672c\u6587\u5230\u6b64\u7ed3\u675f，\u5982\u679c\u5bf9\u4f60\u6709\u5e2e\u52a9，\u53ef\u4ee5\u70b9\u4e2a\u8d5e~<\/p>\n

                                                        \u540e\u7eed\u4f1a\u5728\u5408\u96c6\u91cc\u6301\u7eed\u66f4\u65b0 Java \u76f8\u5173\u7684\u9762\u8bd5\u9898，\u6b22\u8fce\u5173\u6ce8~<\/p>\n

                                                        \u795d\u5404\u4f4d\u90fd\u80fd\u62ff\u5230\u6ee1\u610f\u7684offer~<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"

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