{"id":670,"date":"2023-02-16T05:12:17","date_gmt":"2023-08-08T19:42:21","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java-hashmap-java%e4%b8%ad%e7%9a%84%e5%93%88%e5%b8%8c%e6%98%a0%e5%b0%84%e8%a1%a8%e3%80%82\/"},"modified":"2025-08-03T02:22:59","modified_gmt":"2025-08-02T18:22:59","slug":"java-hashmap-java%e4%b8%ad%e7%9a%84%e5%93%88%e5%b8%8c%e6%98%a0%e5%b0%84%e8%a1%a8%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-hashmap-java%e4%b8%ad%e7%9a%84%e5%93%88%e5%b8%8c%e6%98%a0%e5%b0%84%e8%a1%a8%e3%80%82\/","title":{"rendered":"Java HashMap\u8be6\u89e3\uff1a\u539f\u7406\u3001\u7528\u6cd5\u4e0e\u5b9e\u4f8b\u6559\u7a0b"},"content":{"rendered":"

Java\u7684HashMap\u662fJava\u4e2d\u6700\u6d41\u884c\u7684\u96c6\u5408\u7c7b\u4e4b\u4e00\u3002Java\u7684HashMap\u662f\u57fa\u4e8e\u6563\u5217\u8868\u7684\u5b9e\u73b0\u3002Java\u7684HashMap\u7ee7\u627f\u81eaAbstractMap\u7c7b\uff0c\u8be5\u7c7b\u5b9e\u73b0\u4e86Map\u63a5\u53e3\u3002<\/p>\n

Java \u54c8\u5e0c\u6620\u5c04<\/h2>\n
\n \"java\n<\/div>\n
    \n
  1. Java\u7684HashMap\u5141\u8bb8null\u952e\u548cnull\u503c\u3002<\/li>\n
  2. HashMap\u4e0d\u662f\u6709\u5e8f\u96c6\u5408\u3002\u60a8\u53ef\u4ee5\u901a\u8fc7\u952e\u96c6\u8fed\u4ee3HashMap\u6761\u76ee\uff0c\u4f46\u4e0d\u80fd\u4fdd\u8bc1\u5b83\u4eec\u6309\u7167\u6dfb\u52a0\u5230HashMap\u4e2d\u7684\u987a\u5e8f\u6392\u5217\u3002<\/li>\n
  3. HashMap\u4e0eHashtable\u51e0\u4e4e\u76f8\u4f3c\uff0c\u53ea\u662f\u5b83\u662f\u975e\u540c\u6b65\u7684\uff0c\u5e76\u4e14\u5141\u8bb8null\u952e\u548c\u503c\u3002<\/li>\n
  4. HashMap\u4f7f\u7528\u5b83\u7684\u5185\u90e8\u7c7bNode<K,V>\u6765\u5b58\u50a8\u6620\u5c04\u6761\u76ee\u3002<\/li>\n
  5. HashMap\u5c06\u6761\u76ee\u5b58\u50a8\u5230\u591a\u4e2a\u5355\u5411\u94fe\u8868\u4e2d\uff0c\u79f0\u4e3a\u6876\u6216\u7bb1\u5b50\u3002\u9ed8\u8ba4\u6876\u7684\u6570\u91cf\u662f16\uff0c\u800c\u4e14\u5b83\u603b\u662f2\u7684\u5e42\u3002<\/li>\n
  6. HashMap\u5728\u6267\u884cget\u548cput\u64cd\u4f5c\u65f6\u4f7f\u7528\u952e\u7684hashCode()\u548cequals()\u65b9\u6cd5\u3002\u56e0\u6b64\uff0cHashMap\u952e\u5bf9\u8c61\u5e94\u8be5\u63d0\u4f9b\u5bf9\u8fd9\u4e9b\u65b9\u6cd5\u7684\u826f\u597d\u5b9e\u73b0\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u4e0d\u53ef\u53d8\u7c7b\u66f4\u9002\u5408\u4f5c\u4e3a\u952e\u7684\u539f\u56e0\uff0c\u4f8b\u5982\u5b57\u7b26\u4e32\u548c\u6574\u6570\u3002<\/li>\n
  7. Java\u7684HashMap\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u5bf9\u4e8e\u591a\u7ebf\u7a0b\u73af\u5883\uff0c\u60a8\u5e94\u8be5\u4f7f\u7528ConcurrentHashMap\u7c7b\u6216\u4f7f\u7528Collections.synchronizedMap()\u65b9\u6cd5\u83b7\u53d6\u540c\u6b65\u7684\u6620\u5c04\u3002<\/li>\n<\/ol>\n

    Java HashMap\u7684\u6784\u9020\u51fd\u6570<\/h3>\n

    Java HashMap \u63d0\u4f9b\u4e86\u56db\u4e2a\u6784\u9020\u65b9\u6cd5\u3002<\/p>\n

      \n
    1. public HashMap()<\/strong>\uff1a\u8fd9\u662f\u6700\u5e38\u7528\u7684HashMap\u6784\u9020\u51fd\u6570\u3002\u8fd9\u4e2a\u6784\u9020\u51fd\u6570\u5c06\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684HashMap\uff0c\u9ed8\u8ba4\u521d\u59cb\u5bb9\u91cf\u4e3a16\uff0c\u8d1f\u8f7d\u56e0\u5b50\u4e3a0.75\u3002<\/li>\n
    2. public HashMap(int initialCapacity)<\/strong>\uff1a\u8fd9\u4e2a\u6784\u9020\u51fd\u6570\u7528\u4e8e\u6307\u5b9a\u521d\u59cb\u5bb9\u91cf\u548c0.75\u8d1f\u8f7d\u56e0\u5b50\u3002\u5982\u679c\u60a8\u77e5\u9053\u8981\u5b58\u50a8\u5728HashMap\u4e2d\u7684\u6620\u5c04\u7684\u6570\u91cf\uff0c\u8fd9\u5c06\u6709\u52a9\u4e8e\u907f\u514d\u91cd\u65b0\u54c8\u5e0c\u3002<\/li>\n
    3. public HashMap(int initialCapacity, float loadFactor)<\/strong>\uff1a\u8fd9\u4e2a\u6784\u9020\u51fd\u6570\u5c06\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684HashMap\uff0c\u5177\u6709\u6307\u5b9a\u7684\u521d\u59cb\u5bb9\u91cf\u548c\u8d1f\u8f7d\u56e0\u5b50\u3002\u5982\u679c\u60a8\u77e5\u9053\u8981\u5b58\u50a8\u5728HashMap\u4e2d\u7684\u6620\u5c04\u7684\u6700\u5927\u6570\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e2a\u6784\u9020\u51fd\u6570\u3002\u5728\u5e38\u89c1\u60c5\u51b5\u4e0b\uff0c\u60a8\u5e94\u8be5\u907f\u514d\u4f7f\u7528\u5b83\uff0c\u56e0\u4e3a\u8d1f\u8f7d\u56e0\u5b500.75\u5728\u7a7a\u95f4\u548c\u65f6\u95f4\u6210\u672c\u4e4b\u95f4\u63d0\u4f9b\u4e86\u826f\u597d\u7684\u6298\u8877\u3002<\/li>\n
    4. public HashMap(Map<? extends K, ? extends V> m)<\/strong>\uff1a\u521b\u5efa\u4e00\u4e2a\u5177\u6709\u4e0e\u6307\u5b9a\u6620\u5c04\u76f8\u540c\u6620\u5c04\u7684Map\uff0c\u8d1f\u8f7d\u56e0\u5b50\u4e3a0.75\u3002<\/li>\n<\/ol>\n

      Java HashMap \u6784\u9020\u51fd\u6570\u793a\u4f8b<\/h3>\n

      \u4ee5\u4e0b\u4ee3\u7801\u7247\u6bb5\u5c55\u793a\u4e86\u4f7f\u7528\u4ee5\u4e0a\u6240\u6709\u6784\u9020\u51fd\u6570\u7684HashMap\u793a\u4f8b\u3002<\/p>\n

      Map<String, String> map1 = new HashMap<>();\r\n\r\nMap<String, String> map2 = new HashMap<>(2^5);\r\n\r\nMap<String, String> map3 = new HashMap<>(32,0.80f);\r\n\r\nMap<String,String> map4 = new HashMap<>(map1);\r\n<\/code><\/pre>\n
      Java HashMap \u65b9\u6cd5<\/h3>\n
      \u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0bHashMap\u5728Java\u4e2d\u7684\u91cd\u8981\u65b9\u6cd5\u3002<\/p>\n
        \n
      1. public void clear()<\/strong>\uff1a\u8fd9\u4e2aHashMap\u65b9\u6cd5\u5c06\u5220\u9664\u6240\u6709\u7684\u6620\u5c04\uff0c\u4f7fHashMap\u53d8\u4e3a\u7a7a\u3002<\/li>\n
      2. public boolean containsKey(Object key)<\/strong>\uff1a\u5982\u679c\u5b58\u5728\u8be5\u952e\uff0c\u5219\u6b64\u65b9\u6cd5\u8fd4\u56detrue\uff0c\u5426\u5219\u8fd4\u56defalse\u3002<\/li>\n
      3. public boolean containsValue(Object value)<\/strong>\uff1a\u5982\u679c\u5b58\u5728\u8be5\u503c\uff0c\u5219\u6b64HashMap\u65b9\u6cd5\u8fd4\u56detrue\uff0c\u5426\u5219\u8fd4\u56defalse\u3002<\/li>\n
      4. public Set<Map.Entry<K,V>> entrySet()<\/strong>\uff1a\u6b64\u65b9\u6cd5\u8fd4\u56deHashMap\u6620\u5c04\u7684Set\u89c6\u56fe\u3002\u8be5\u96c6\u5408\u662f\u7531\u6620\u5c04\u652f\u6301\u7684\uff0c\u56e0\u6b64\u5bf9\u6620\u5c04\u7684\u66f4\u6539\u4f1a\u53cd\u6620\u5728\u96c6\u5408\u4e2d\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002<\/li>\n
      5. public V get(Object key)<\/strong>\uff1a\u8fd4\u56de\u4e0e\u6307\u5b9a\u952e\u76f8\u5173\u8054\u7684\u503c\uff0c\u5982\u679c\u952e\u6ca1\u6709\u6620\u5c04\u4efb\u4f55\u503c\uff0c\u5219\u8fd4\u56denull\u3002<\/li>\n
      6. public boolean isEmpty()<\/strong>\uff1a\u4e00\u4e2a\u5b9e\u7528\u65b9\u6cd5\uff0c\u5982\u679c\u6ca1\u6709\u952e\u503c\u6620\u5c04\uff0c\u5219\u8fd4\u56detrue\u3002<\/li>\n
      7. public Set<K> keySet()<\/strong>\uff1a\u8fd4\u56de\u6b64\u6620\u5c04\u4e2d\u5305\u542b\u7684\u952e\u7684Set\u89c6\u56fe\u3002\u8be5\u96c6\u5408\u662f\u7531\u6620\u5c04\u652f\u6301\u7684\uff0c\u56e0\u6b64\u5bf9\u6620\u5c04\u7684\u66f4\u6539\u4f1a\u53cd\u6620\u5728\u96c6\u5408\u4e2d\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002<\/li>\n
      8. public V put(K key, V value)<\/strong>\uff1a\u5c06\u6307\u5b9a\u503c\u4e0e\u6307\u5b9a\u952e\u5728\u6b64\u6620\u5c04\u4e2d\u5173\u8054\u3002\u5982\u679c\u6620\u5c04\u5148\u524d\u5305\u542b\u952e\u7684\u6620\u5c04\uff0c\u5219\u65e7\u503c\u5c06\u88ab\u66ff\u6362\u3002<\/li>\n
      9. public void putAll(Map<? extends K, ? extends V> m)<\/strong>\uff1a\u5c06\u6307\u5b9a\u6620\u5c04\u4e2d\u7684\u6240\u6709\u6620\u5c04\u590d\u5236\u5230\u6b64\u6620\u5c04\u4e2d\u3002\u8fd9\u4e9b\u6620\u5c04\u5c06\u66ff\u6362\u8be5\u6620\u5c04\u4e2d\u5f53\u524d\u5b58\u5728\u7684\u4efb\u4f55\u952e\u7684\u6620\u5c04\u3002<\/li>\n
      10. public V remove(Object key)<\/strong>\uff1a\u5982\u679c\u5b58\u5728\uff0c\u5219\u4ece\u8be5\u6620\u5c04\u4e2d\u5220\u9664\u6307\u5b9a\u952e\u7684\u6620\u5c04\u3002<\/li>\n
      11. public int size()<\/strong>\uff1a\u8fd4\u56de\u8be5\u6620\u5c04\u4e2d\u7684\u952e\u503c\u6620\u5c04\u6570\u3002<\/li>\n
      12. public Collection<V> values()<\/strong>\uff1a\u8fd4\u56de\u6b64\u6620\u5c04\u4e2d\u5305\u542b\u7684\u503c\u7684\u96c6\u5408\u89c6\u56fe\u3002\u8be5\u96c6\u5408\u662f\u7531\u6620\u5c04\u652f\u6301\u7684\uff0c\u56e0\u6b64\u5bf9\u6620\u5c04\u7684\u66f4\u6539\u4f1a\u53cd\u6620\u5728\u96c6\u5408\u4e2d\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002<\/li>\n<\/ol>\n
        \u5728Java 8\u4e2d\uff0cHashMap\u5f15\u5165\u4e86\u8bb8\u591a\u65b0\u7684\u65b9\u6cd5\u3002<\/p>\n
          \n
        1. public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction)<\/strong>\uff1a\u5982\u679c\u6307\u5b9a\u7684\u952e\u5c1a\u672a\u4e0e\u503c\u5173\u8054\uff08\u6216\u8005\u4e0enull\u5173\u8054\uff09\uff0c\u8be5\u65b9\u6cd5\u5c06\u5c1d\u8bd5\u4f7f\u7528\u7ed9\u5b9a\u7684\u6620\u5c04\u51fd\u6570\u8ba1\u7b97\u5176\u503c\uff0c\u5e76\u5c06\u5176\u8f93\u5165\u5230HashMap\u4e2d\uff0c\u9664\u975e\u503c\u4e3aNull\u3002<\/li>\n
        2. public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction)<\/strong>\uff1a\u5982\u679c\u6307\u5b9a\u952e\u7684\u503c\u5b58\u5728\u4e14\u975enull\uff0c\u5219\u5c1d\u8bd5\u4f7f\u7528\u952e\u548c\u5176\u5f53\u524d\u6620\u5c04\u503c\u8ba1\u7b97\u65b0\u6620\u5c04\u3002<\/li>\n
        3. public V compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction)<\/strong>\uff1a\u8be5HashMap\u65b9\u6cd5\u5c1d\u8bd5\u4e3a\u6307\u5b9a\u7684\u952e\u548c\u5176\u5f53\u524d\u6620\u5c04\u503c\u8ba1\u7b97\u6620\u5c04\u3002<\/li>\n
        4. public void forEach(BiConsumer<? super K, ? super V> action)<\/strong>\uff1a\u8be5\u65b9\u6cd5\u5bf9\u8be5\u6620\u5c04\u4e2d\u7684\u6bcf\u4e2a\u6761\u76ee\u6267\u884c\u7ed9\u5b9a\u7684\u64cd\u4f5c\u3002<\/li>\n
        5. public V getOrDefault(Object key, V defaultValue)<\/strong>\uff1a\u4e0eget\u65b9\u6cd5\u76f8\u540c\uff0c\u53ea\u662f\u5982\u679c\u672a\u627e\u5230\u6307\u5b9a\u952e\u7684\u6620\u5c04\uff0c\u5219\u8fd4\u56dedefaultValue\u3002<\/li>\n
        6. public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction)<\/strong>\uff1a\u5982\u679c\u6307\u5b9a\u7684\u952e\u5c1a\u672a\u4e0e\u503c\u5173\u8054\u6216\u8005\u4e0enull\u5173\u8054\uff0c\u5219\u5c06\u5176\u4e0e\u7ed9\u5b9a\u7684\u975enull\u503c\u5173\u8054\u3002\u5426\u5219\uff0c\u7528\u7ed9\u5b9a\u7684\u91cd\u65b0\u6620\u5c04\u51fd\u6570\u7684\u7ed3\u679c\u66ff\u6362\u5173\u8054\u7684\u503c\uff0c\u5982\u679c\u7ed3\u679c\u4e3anull\uff0c\u5219\u79fb\u9664\u3002<\/li>\n
        7. public V putIfAbsent(K key, V value)<\/strong>\uff1a\u5982\u679c\u6307\u5b9a\u7684\u952e\u5c1a\u672a\u4e0e\u503c\u5173\u8054\uff08\u6216\u8005\u4e0enull\u5173\u8054\uff09\uff0c\u5c06\u5176\u4e0e\u7ed9\u5b9a\u503c\u5173\u8054\uff0c\u5e76\u8fd4\u56denull\uff1b\u5426\u5219\u8fd4\u56de\u5f53\u524d\u503c\u3002<\/li>\n
        8. public boolean remove(Object key, Object value)<\/strong>\uff1a\u4ec5\u5728\u6307\u5b9a\u952e\u5f53\u524d\u6620\u5c04\u5230\u6307\u5b9a\u503c\u65f6\u624d\u5220\u9664\u8be5\u6761\u76ee\u3002<\/li>\n
        9. public boolean replace(K key, V oldValue, V newValue)<\/strong>\uff1a\u4ec5\u5f53\u6307\u5b9a\u952e\u5f53\u524d\u6620\u5c04\u5230\u6307\u5b9a\u503c\u65f6\uff0c\u624d\u66ff\u6362\u8be5\u6761\u76ee\u3002<\/li>\n
        10. public V replace(K key, V value)<\/strong>\uff1a\u4ec5\u5f53\u6307\u5b9a\u952e\u5f53\u524d\u6620\u5c04\u5230\u67d0\u4e2a\u503c\u65f6\uff0c\u624d\u66ff\u6362\u8be5\u6761\u76ee\u3002<\/li>\n
        11. public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function)<\/strong>\uff1a\u4f7f\u7528\u7ed9\u5b9a\u51fd\u6570\u5bf9\u6bcf\u4e2a\u6761\u76ee\u7684\u503c\u8fdb\u884c\u66ff\u6362\u3002<\/li>\n<\/ol>\n
          Java HashMap \u793a\u4f8b<\/h3>\n
          \u8fd9\u662f\u4e00\u4e2a\u5e38\u7528\u7684HashMap\u65b9\u6cd5\u7684\u7b80\u5355Java\u7a0b\u5e8f\u3002<\/p>\n
          Java HashMap\u793a\u4f8b\u4ee3\u7801<\/h3>\n
          package com.Olivia.examples;\r\n\r\nimport java.util.Collection;\r\nimport java.util.HashMap;\r\nimport java.util.Map;\r\nimport java.util.Map.Entry;\r\nimport java.util.Set;\r\n\r\npublic class HashMapExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tMap<String, String> map = new HashMap<>();\r\n\r\n\t\tmap.put(\"1\", \"1\"); \/\/ put\u793a\u4f8b\r\n\t\tmap.put(\"2\", \"2\");\r\n\t\tmap.put(\"3\", \"3\");\r\n\t\tmap.put(\"4\", null); \/\/ null\u503c\r\n\t\tmap.put(null, \"100\"); \/\/ null\u952e\r\n\r\n\t\tString value = map.get(\"3\"); \/\/ get\u793a\u4f8b\r\n\t\tSystem.out.println(\"Key = 3, Value = \" + value);\r\n\r\n\t\tvalue = map.getOrDefault(\"5\", \"Default Value\");\r\n\t\tSystem.out.println(\"Key = 5, Value=\" + value);\r\n\r\n\t\tboolean keyExists = map.containsKey(null);\r\n\t\tboolean valueExists = map.containsValue(\"100\");\r\n\r\n\t\tSystem.out.println(\"keyExists=\" + keyExists + \", valueExists=\" + valueExists);\r\n\r\n\t\tSet<Entry<String, String>> entrySet = map.entrySet();\r\n\t\tSystem.out.println(entrySet);\r\n\r\n\t\tSystem.out.println(\"map size=\" + map.size());\r\n\r\n\t\tMap<String, String> map1 = new HashMap<>();\r\n\t\tmap1.putAll(map);\r\n\t\tSystem.out.println(\"map1 mappings= \" + map1);\r\n\r\n\t\tString nullKeyValue = map1.remove(null);\r\n\t\tSystem.out.println(\"map1 null key value = \" + nullKeyValue);\r\n\t\tSystem.out.println(\"map1 after removing null key = \" + map1);\r\n\r\n\t\tSet<String> keySet = map.keySet();\r\n\t\tSystem.out.println(\"map keys = \" + keySet);\r\n\r\n\t\tCollection<String> values = map.values();\r\n\t\tSystem.out.println(\"map values = \" + values);\r\n\r\n\t\tmap.clear();\r\n\t\tSystem.out.println(\"map is empty=\" + map.isEmpty());\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
          \u4ee5\u4e0b\u662f\u4e0a\u8ff0Java HashMap\u793a\u4f8b\u7a0b\u5e8f\u7684\u8f93\u51fa\u3002<\/p>\n
          Key = 3, Value = 3\r\nKey = 5, Value=Default Value\r\nkeyExists=true, valueExists=true\r\n[null=100, 1=1, 2=2, 3=3, 4=null]\r\nmap size=5\r\nmap1 mappings= {null=100, 1=1, 2=2, 3=3, 4=null}\r\nmap1 null key value = 100\r\nmap1 after removing null key = {1=1, 2=2, 3=3, 4=null}\r\nmap keys = [null, 1, 2, 3, 4]\r\nmap values = [100, 1, 2, 3, null]\r\nmap is empty=true\r\n<\/code><\/pre>\n
          HashMap\u5728Java\u4e2d\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/h3>\n
          \n    \"Java\n<\/div>\n
          Java HashMap \u52a0\u8f7d\u56e0\u5b50<\/h3>\n
          \u8d1f\u8f7d\u56e0\u5b50\u7528\u4e8e\u786e\u5b9a\u4f55\u65f6\u91cd\u65b0\u54c8\u5e0c\u54c8\u5e0c\u6620\u5c04\u8868\uff0c\u5e76\u589e\u52a0\u6876\u7684\u5927\u5c0f\u3002\u6876\u6216\u5bb9\u91cf\u7684\u9ed8\u8ba4\u503c\u662f16\uff0c\u8d1f\u8f7d\u56e0\u5b50\u4e3a0.75\u3002\u91cd\u65b0\u54c8\u5e0c\u7684\u9608\u503c\u662f\u901a\u8fc7\u5c06\u5bb9\u91cf\u548c\u8d1f\u8f7d\u56e0\u5b50\u76f8\u4e58\u6765\u8ba1\u7b97\u7684\u3002\u56e0\u6b64\uff0c\u9ed8\u8ba4\u9608\u503c\u4e3a12\u3002\u5f53\u54c8\u5e0c\u6620\u5c04\u8868\u8d85\u8fc712\u4e2a\u6620\u5c04\u65f6\uff0c\u5c06\u8fdb\u884c\u91cd\u65b0\u54c8\u5e0c\uff0c\u5e76\u5c06\u6876\u7684\u6570\u91cf\u589e\u52a0\u52302\u7684\u4e0b\u4e00\u4e2a\u5e42\u537332\u3002\u8bf7\u6ce8\u610f\uff0c\u54c8\u5e0c\u6620\u5c04\u8868\u7684\u5bb9\u91cf\u59cb\u7ec8\u4e3a2\u7684\u5e42\u3002\u9ed8\u8ba4\u8d1f\u8f7d\u56e0\u5b500.75\u5728\u7a7a\u95f4\u548c\u65f6\u95f4\u590d\u6742\u6027\u4e4b\u95f4\u63d0\u4f9b\u4e86\u826f\u597d\u7684\u6743\u8861\u3002\u4f46\u662f\uff0c\u6839\u636e\u60a8\u7684\u9700\u6c42\uff0c\u60a8\u53ef\u4ee5\u5c06\u5176\u8bbe\u7f6e\u4e3a\u4e0d\u540c\u7684\u503c\u3002\u5982\u679c\u60a8\u60f3\u8282\u7701\u7a7a\u95f4\uff0c\u53ef\u4ee5\u5c06\u5176\u589e\u52a0\u52300.80\u62160.90\uff0c\u4f46\u8fd9\u6837\u4f1a\u4f7f\u83b7\u53d6\/\u653e\u7f6e\u64cd\u4f5c\u7684\u65f6\u95f4\u66f4\u957f\u3002<\/p>\n
          Java HashMap\u7684\u952e\u96c6\u5408<\/h3>\n
          Java HashMap \u7684 keySet \u65b9\u6cd5\u8fd4\u56de HashMap \u4e2d\u952e\u7684 Set \u89c6\u56fe\u3002\u8fd9\u4e2a Set \u89c6\u56fe\u662f\u7531 HashMap \u652f\u6301\u7684\uff0cHashMap \u4e2d\u7684\u4efb\u4f55\u66f4\u6539\u90fd\u4f1a\u53cd\u6620\u5728 Set \u4e2d\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u7a0b\u5e8f\u793a\u4f8b\uff0c\u5c55\u793a\u4e86 HashMap keySet \u7684\u7528\u6cd5\uff0c\u5e76\u4ecb\u7ecd\u4e86\u5982\u679c\u60f3\u8981\u4e00\u4e2a\u975e\u7531 map \u652f\u6301\u7684\u81ea\u5df1\u7684 keySet \u65b9\u6cd5\u5e94\u8be5\u600e\u4e48\u505a\u3002<\/p>\n
          package com.Olivia.examples;\r\n\r\nimport java.util.HashMap;\r\nimport java.util.HashSet;\r\nimport java.util.Map;\r\nimport java.util.Set;\r\n\r\npublic class HashMapKeySetExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tMap<String, String> map = new HashMap<>();\r\n\t\tmap.put(\"1\", \"1\");\r\n\t\tmap.put(\"2\", \"2\");\r\n\t\tmap.put(\"3\", \"3\");\r\n\r\n\t\tSet<String> keySet = map.keySet();\r\n\t\tSystem.out.println(keySet);\r\n\r\n\t\tmap.put(\"4\", \"4\");\r\n\t\tSystem.out.println(keySet); \/\/ keySet\u7531Map\u652f\u6301\r\n\r\n\t\tkeySet.remove(\"1\");\r\n\t\tSystem.out.println(map); \/\/ map\u4e5f\u88ab\u4fee\u6539\r\n\r\n\t\tkeySet = new HashSet<>(map.keySet()); \/\/ \u5c06\u952e\u590d\u5236\u5230\u65b0\u7684Set\u4e2d\r\n\t\tmap.put(\"5\", \"5\");\r\n\t\tSystem.out.println(keySet); \/\/ keySet\u672a\u88ab\u4fee\u6539\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
          \u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u6e05\u695a\u5730\u8868\u660e\u4e86keySet\u662f\u7531map\u652f\u6301\u7684\u3002<\/p>\n
          [1, 2, 3]\r\n[1, 2, 3, 4]\r\n{2=2, 3=3, 4=4}\r\n[2, 3, 4]\r\n<\/code><\/pre>\n
          Java HashMap\u7684\u503c<\/h3>\n
          Java\u7684HashMap\u7684values\u65b9\u6cd5\u8fd4\u56de\u4e86Map\u4e2d\u503c\u7684\u4e00\u4e2aCollection\u89c6\u56fe\u3002\u8fd9\u4e2a\u96c6\u5408\u662f\u7531HashMap\u652f\u6301\u7684\uff0c\u6240\u4ee5HashMap\u4e2d\u7684\u4efb\u4f55\u53d8\u5316\u90fd\u4f1a\u5728values\u96c6\u5408\u4e2d\u53cd\u6620\u51fa\u6765\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002\u4e0b\u9762\u7684\u4e00\u4e2a\u7b80\u5355\u4f8b\u5b50\u8bc1\u5b9e\u4e86HashMap values\u96c6\u5408\u7684\u8fd9\u79cd\u884c\u4e3a\u3002<\/p>\n
          package com.Olivia.examples;\r\n\r\nimport java.util.Collection;\r\nimport java.util.HashMap;\r\nimport java.util.Map;\r\n\r\npublic class HashMapValuesExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tMap<String, String> map = new HashMap<>();\r\n\t\tmap.put(\"1\", \"1\");\r\n\t\tmap.put(\"2\", \"2\");\r\n\t\tmap.put(\"3\", null);\r\n\t\tmap.put(\"4\", null);\r\n\t\tmap.put(null, \"100\");\r\n\r\n\t\tCollection<String> values = map.values();\r\n\t\tSystem.out.println(\"map values = \" + values);\r\n\r\n\t\tmap.remove(null);\r\n\t\tSystem.out.println(\"map values after removing null key = \" + values);\r\n\r\n\t\tmap.put(\"5\", \"5\");\r\n\t\tSystem.out.println(\"map values after put = \" + values);\r\n\r\n\t\tSystem.out.println(map);\r\n\t\tvalues.remove(\"1\"); \/\/ \u66f4\u6539values\u96c6\u5408\r\n\t\tSystem.out.println(map); \/\/ map\u4e5f\u88ab\u66f4\u65b0\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
          \u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u5982\u4e0b\u3002<\/p>\n
          map values = [100, 1, 2, null, null]\r\nmap values after removing null key = [1, 2, null, null]\r\nmap values after put = [1, 2, null, null, 5]\r\n{1=1, 2=2, 3=null, 4=null, 5=5}\r\n{2=2, 3=null, 4=null, 5=5}\r\n<\/code><\/pre>\n
          Java HashMap\u7684entrySet<\/h3>\n
          Java\u7684HashMap\u7684entrySet\u65b9\u6cd5\u8fd4\u56de\u6620\u5c04\u7684Set\u89c6\u56fe\u3002\u8fd9\u4e2aentrySet\u662f\u7531HashMap\u652f\u6301\u7684\uff0c\u6240\u4ee5\u5bf9map\u7684\u4efb\u4f55\u66f4\u6539\u90fd\u4f1a\u53cd\u6620\u5728entry set\u4e2d\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002\u8bf7\u770b\u4e0b\u9762\u7684HashMap entrySet\u793a\u4f8b\u7a0b\u5e8f\u3002<\/p>\n
          \u8fd9\u662f\u6587\u7ae0\u300aJava HashMap – Java\u4e2d\u7684\u54c8\u5e0c\u6620\u5c04\u8868\u300b\u7684\u7b2c3\u90e8\u5206\uff08\u51715\u90e8\u5206\uff09\u3002<\/p>\n
          package com.Olivia.examples;\r\n\r\nimport java.util.AbstractMap;\r\nimport java.util.HashMap;\r\nimport java.util.Iterator;\r\nimport java.util.Map;\r\nimport java.util.Map.Entry;\r\nimport java.util.Set;\r\n\r\npublic class HashMapEntrySetExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tMap<String, String> map = new HashMap<>();\r\n\t\tmap.put(\"1\", \"1\");\r\n\t\tmap.put(\"2\", null);\r\n\t\tmap.put(null, \"100\");\r\n\r\n\t\tSet<Entry<String,String>> entrySet = map.entrySet();\r\n\t\tIterator<Entry<String, String>> iterator = entrySet.iterator();\r\n\t\tEntry<String, String> next = null;\r\n\t\t\r\n\t\tSystem.out.println(\"\u5904\u7406\u524d\u7684map = \"+map);\r\n\t\tSystem.out.println(\"\u5904\u7406\u524d\u7684entrySet = \"+entrySet);\r\n\t\twhile(iterator.hasNext()){\r\n\t\t\tnext = iterator.next();\r\n\t\t\tSystem.out.println(\"\u6b63\u5728\u5904\u7406: \"+next.getValue());\r\n\t\t\tif(next.getKey() == null) iterator.remove();\r\n\t\t}\r\n\t\t\r\n\t\tSystem.out.println(\"\u5904\u7406\u540e\u7684map = \"+map);\r\n\t\tSystem.out.println(\"\u5904\u7406\u540e\u7684entrySet = \"+entrySet);\r\n\t\t\r\n\t\tEntry<String, String> simpleEntry = new AbstractMap.SimpleEntry<String, String>(\"1\",\"1\");\r\n\t\tentrySet.remove(simpleEntry);\r\n\t\tSystem.out.println(\"\u79fb\u9664Entry\u540e\u7684map = \"+map);\r\n\t\tSystem.out.println(\"\u79fb\u9664Entry\u540e\u7684entrySet = \"+entrySet);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
          \u4ee5\u4e0b\u662f\u7531\u4e0a\u8ff0\u7a0b\u5e8f\u751f\u6210\u7684\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n
          \u5904\u7406\u524d\u7684map = {null=100, 1=1, 2=null}\r\n\u5904\u7406\u524d\u7684entrySet = [null=100, 1=1, 2=null]\r\n\u6b63\u5728\u5904\u7406: 100\r\n\u6b63\u5728\u5904\u7406: 1\r\n\u6b63\u5728\u5904\u7406: null\r\n\u5904\u7406\u540e\u7684map = {1=1, 2=null}\r\n\u5904\u7406\u540e\u7684entrySet = [1=1, 2=null]\r\n\u79fb\u9664Entry\u540e\u7684map = {2=null}\r\n\u79fb\u9664Entry\u540e\u7684entrySet = [2=null]\r\n<\/code><\/pre>\n
          Java HashMap\u7684putIfAbsent\u65b9\u6cd5<\/h3>\n
          \u4ee5\u4e0b\u662fJava 8\u4e2d\u5f15\u5165\u7684HashMap putIfAbsent\u65b9\u6cd5\u7684\u7b80\u5355\u793a\u4f8b\u3002<\/p>\n
          package com.Olivia.examples;\r\n\r\nimport java.util.HashMap;\r\nimport java.util.Map;\r\n\r\npublic class HashMapPutIfAbsentExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tMap<String, String> map = new HashMap<>();\r\n\t\tmap.put(\"1\", \"1\");\r\n\t\tmap.put(\"2\", null);\r\n\t\tmap.put(null, \"100\");\r\n\r\n\t\tSystem.out.println(\"putIfAbsent\u64cd\u4f5c\u524d\u7684map = \"+map);\r\n\t\tString value = map.putIfAbsent(\"1\", \"4\");\r\n\t\tSystem.out.println(\"putIfAbsent\u64cd\u4f5c\u540e\u7684map = \"+map);\r\n\t\tSystem.out.println(\"putIfAbsent\u8fd4\u56de\u503c: \"+value);\r\n\t\t\r\n\t\tSystem.out.println(\"putIfAbsent\u64cd\u4f5c\u524d\u7684map = \"+map);\r\n\t\tvalue = map.putIfAbsent(\"3\", \"3\");\r\n\t\tSystem.out.println(\"putIfAbsent\u64cd\u4f5c\u540e\u7684map = \"+map);\r\n\t\tSystem.out.println(\"putIfAbsent\u8fd4\u56de\u503c: \"+value);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
          \u4e0a\u8ff0\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\uff1a<\/p>\n
          putIfAbsent\u64cd\u4f5c\u524d\u7684map = {null=100, 1=1, 2=null}\r\nputIfAbsent\u64cd\u4f5c\u540e\u7684map = {null=100, 1=1, 2=null}\r\nputIfAbsent\u8fd4\u56de\u503c: 1\r\nputIfAbsent\u64cd\u4f5c\u524d\u7684map = {null=100, 1=1, 2=null}\r\nputIfAbsent\u64cd\u4f5c\u540e\u7684map = {null=100, 1=1, 2=null, 3=3}\r\nputIfAbsent\u8fd4\u56de\u503c: null\r\n<\/code><\/pre>\n
          Java HashMap \u7684 forEach \u65b9\u6cd5<\/h3>\n
          \u5728Java 8\u4e2d\u5f15\u5165\u4e86HashMap\u7684forEach\u65b9\u6cd5\u3002\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u6709\u7528\u7684\u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u5728\u6620\u5c04\u8868\u4e2d\u7684\u6bcf\u4e2a\u6761\u76ee\u4e0a\u6267\u884c\u7ed9\u5b9a\u7684\u64cd\u4f5c\uff0c\u76f4\u5230\u6240\u6709\u6761\u76ee\u90fd\u88ab\u5904\u7406\u5b8c\u6216\u64cd\u4f5c\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n
          package com.Olivia.examples;\r\n\r\nimport java.util.HashMap;\r\nimport java.util.Map;\r\nimport java.util.function.BiConsumer;\r\n\r\npublic class HashMapForEachExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tMap<String, String> map = new HashMap<>();\r\n\t\tmap.put(\"1\", \"1\");\r\n\t\tmap.put(\"2\", null);\r\n\t\tmap.put(null, \"100\");\r\n\r\n\t\tBiConsumer<String, String> action = new MyBiConsumer();\r\n\t\tmap.forEach(action);\r\n\t\t\r\n\t\t\/\/lambda\u8868\u8fbe\u5f0f\u793a\u4f8b\r\n\t\tSystem.out.println(\"\\nHashMap forEach lambda\u8868\u8fbe\u5f0f\u793a\u4f8b\\n\");\r\n\t\tmap.forEach((k,v) -> {System.out.println(\"\u952e = \"+k+\", \u503c = \"+v);});\r\n\t}\r\n\r\n}\r\n\r\nclass MyBiConsumer implements BiConsumer<String, String> {\r\n\r\n\t@Override\r\n\tpublic void accept(String t, String u) {\r\n\t\tSystem.out.println(\"\u952e = \" + t);\r\n\t\tSystem.out.println(\"\u6b63\u5728\u5904\u7406\u7684\u503c = \" + u);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
          \u4ee5\u4e0aHashMap forEach\u793a\u4f8b\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\uff1a<\/p>\n
          \u952e = null\r\n\u6b63\u5728\u5904\u7406\u7684\u503c = 100\r\n\u952e = 1\r\n\u6b63\u5728\u5904\u7406\u7684\u503c = 1\r\n\u952e = 2\r\n\u6b63\u5728\u5904\u7406\u7684\u503c = null\r\n\r\nHashMap forEach lambda\u8868\u8fbe\u5f0f\u793a\u4f8b\r\n\r\n\u952e = null, \u503c = 100\r\n\u952e = 1, \u503c = 1\r\n\u952e = 2, \u503c = null\r\n<\/code><\/pre>\n
          Java\u7684HashMap\u4e2d\u7684replaceAll\u65b9\u6cd5<\/h3>\n
          HashMap\u7684replaceAll\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u5c06\u6bcf\u4e2a\u6761\u76ee\u7684\u503c\u66ff\u6362\u4e3a\u5bf9\u8be5\u6761\u76ee\u8c03\u7528\u7ed9\u5b9a\u51fd\u6570\u7684\u7ed3\u679c\u3002\u6b64\u65b9\u6cd5\u5728Java 8\u4e2d\u6dfb\u52a0\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528lambda\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u6b64\u65b9\u6cd5\u7684\u53c2\u6570\u3002<\/p>\n
          package com.Olivia.examples;\r\n\r\nimport java.util.HashMap;\r\nimport java.util.Map;\r\nimport java.util.function.BiFunction;\r\n\r\npublic class HashMapReplaceAllExample {\r\n\r\n    public static void main(String[] args) {\r\n        Map<String, String> map = new HashMap<>();\r\n        map.put(\"1\", \"1\");\r\n        map.put(\"2\", \"2\");\r\n        map.put(null, \"100\");\r\n\r\n        System.out.println(\"replaceAll\u4e4b\u524d\u7684\u6620\u5c04 = \" + map);\r\n        BiFunction<String, String, String> function = new MyBiFunction();\r\n        map.replaceAll(function);\r\n        System.out.println(\"replaceAll\u4e4b\u540e\u7684\u6620\u5c04 = \" + map);\r\n\r\n        \/\/ \u4f7f\u7528lambda\u8868\u8fbe\u5f0f\u7684replaceAll\r\n        map.replaceAll((k, v) -> {\r\n            if (k != null) return k + v;\r\n            else return v;});\r\n        System.out.println(\"\u4f7f\u7528lambda\u8868\u8fbe\u5f0freplaceAll\u540e\u7684\u6620\u5c04 = \" + map);\r\n\r\n    }\r\n\r\n}\r\n\r\nclass MyBiFunction implements BiFunction<String, String, String> {\r\n\r\n    @Override\r\n    public String apply(String t, String u) {\r\n        if (t != null)\r\n            return t + u;\r\n        else\r\n            return u;\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n
          \u4ee5\u4e0aHashMap replaceAll\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\uff1a<\/p>\n
          replaceAll\u4e4b\u524d\u7684\u6620\u5c04 = {null=100, 1=1, 2=2}\r\nreplaceAll\u4e4b\u540e\u7684\u6620\u5c04 = {null=100, 1=11, 2=22}\r\n\u4f7f\u7528lambda\u8868\u8fbe\u5f0freplaceAll\u540e\u7684\u6620\u5c04 = {null=100, 1=111, 2=222}\r\n<\/code><\/pre>\n
          Java HashMap \u7684 computeIfAbsent \u65b9\u6cd5<\/h3>\n
          HashMap \u7684 computeIfAbsent \u65b9\u6cd5\u4ec5\u5728\u6620\u5c04\u4e2d\u4e0d\u5b58\u5728\u952e\u65f6\u8ba1\u7b97\u503c\u3002\u5728\u8ba1\u7b97\u5b8c\u503c\u4e4b\u540e\uff0c\u5982\u679c\u503c\u4e0d\u4e3a\u7a7a\uff0c\u5219\u5c06\u5176\u653e\u5165\u6620\u5c04\u4e2d\u3002<\/p>\n
          package com.Olivia.examples;\r\n\r\nimport java.util.HashMap;\r\nimport java.util.Map;\r\nimport java.util.function.Function;\r\n\r\npublic class HashMapComputeIfAbsent {\r\n\r\n    public static void main(String[] args) {\r\n        Map<String, String> map = new HashMap<>();\r\n        map.put(\"1\", \"10\");\r\n        map.put(\"2\", \"20\");\r\n        map.put(null, \"100\");\r\n\r\n        Function<String, String> function = new MyFunction();\r\n        map.computeIfAbsent(\"3\", function); \/\/ \u952e\u4e0d\u5b58\u5728\r\n        map.computeIfAbsent(\"2\", function); \/\/ \u952e\u5df2\u5b58\u5728\r\n        \r\n        \/\/ lambda\u65b9\u5f0f\r\n        map.computeIfAbsent(\"4\", v -> {return v;});\r\n        map.computeIfAbsent(\"5\", v -> {return null;}); \/\/ null\u503c\u4e0d\u4f1a\u88ab\u63d2\u5165\r\n        System.out.println(map);\r\n    }\r\n\r\n}\r\n\r\nclass MyFunction implements Function<String, String> {\r\n\r\n    @Override\r\n    public String apply(String t) {\r\n        return t;\r\n    }\r\n    \r\n}\r\n<\/code><\/pre>\n
          \u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u662f\uff1a<\/p>\n
          {null=100, 1=10, 2=20, 3=3, 4=4}\r\n<\/code><\/pre>\n
          Java HashMap \u7684 computeIfPresent \u65b9\u6cd5<\/h3>\n
          Java HashMap \u7684 computeIfPresent \u65b9\u6cd5\u4f1a\u91cd\u65b0\u8ba1\u7b97\u503c\uff0c\u5982\u679c\u6307\u5b9a\u7684\u952e\u5b58\u5728\u4e14\u503c\u4e0d\u4e3a null\u3002\u5982\u679c\u51fd\u6570\u8fd4\u56de null\uff0c\u6620\u5c04\u5c06\u88ab\u79fb\u9664\u3002<\/p>\n
          package com.Olivia.examples;\r\n\r\nimport java.util.HashMap;\r\nimport java.util.Map;\r\nimport java.util.function.BiFunction;\r\n\r\npublic class HashMapComputeIfPresentExample {\r\n\r\n    public static void main(String[] args) {\r\n        Map<String, String> map = new HashMap<>();\r\n        map.put(\"1\", \"10\");\r\n        map.put(\"2\", \"20\");\r\n        map.put(null, \"100\");\r\n        map.put(\"10\", null);\r\n\r\n        System.out.println(\"computeIfPresent\u4e4b\u524d\u7684\u6620\u5c04 = \" + map);\r\n        BiFunction<String, String, String> function = new MyBiFunction1();\r\n        for (String key : map.keySet()) {\r\n            map.computeIfPresent(key, function);\r\n        }\r\n        \r\n        System.out.println(\"computeIfPresent\u4e4b\u540e\u7684\u6620\u5c04 = \" + map);\r\n        map.computeIfPresent(\"1\", (k,v) -> {return null;}); \/\/ \u6620\u5c04\u5c06\u88ab\u79fb\u9664\r\n        System.out.println(\"computeIfPresent\u4e4b\u540e\u7684\u6620\u5c04 = \" + map);\r\n\r\n    }\r\n\r\n}\r\n\r\nclass MyBiFunction1 implements BiFunction<String, String, String> {\r\n\r\n    @Override\r\n    public String apply(String t, String u) {\r\n        return t + u;\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n
          HashMap\u7684computeIfPresent\u793a\u4f8b\u4ea7\u751f\u7684\u8f93\u51fa\u662f\uff1a<\/p>\n
          computeIfPresent\u4e4b\u524d\u7684\u6620\u5c04 = {null=100, 1=10, 2=20, 10=null}\r\ncomputeIfPresent\u4e4b\u540e\u7684\u6620\u5c04 = {null=null100, 1=110, 2=220, 10=null}\r\ncomputeIfPresent\u4e4b\u540e\u7684\u6620\u5c04 = {null=null100, 2=220, 10=null}\r\n<\/code><\/pre>\n
          Java HashMap \u7684 compute \u65b9\u6cd5<\/h3>\n
          \u5982\u679c\u60a8\u60f3\u5bf9\u6240\u6709\u57fa\u4e8e\u952e\u548c\u503c\u7684\u6620\u5c04\u5e94\u7528\u4e00\u4e2a\u51fd\u6570\uff0c\u90a3\u4e48\u5e94\u8be5\u4f7f\u7528 compute \u65b9\u6cd5\u3002\u5982\u679c\u4f7f\u7528\u8be5\u65b9\u6cd5\u65f6\u4e0d\u5b58\u5728\u6620\u5c04\uff0ccompute \u51fd\u6570\u7684\u503c\u5c06\u4e3a null\u3002<\/p>\n
          package com.Olivia.examples;\r\n\r\nimport java.util.HashMap;\r\nimport java.util.Map;\r\n\r\npublic class HashMapComputeExample {\r\n\r\n    public static void main(String[] args) {\r\n        Map<String, String> map = new HashMap<>();\r\n        map.put(\"1\", \"1\");\r\n        map.put(\"2\", \"2\");\r\n        map.put(null, \"10\");\r\n        map.put(\"10\", null);\r\n\r\n        System.out.println(\"compute\u4e4b\u524d\u7684\u6620\u5c04 = \"+map);\r\n        for (String key : map.keySet()) {\r\n            map.compute(key, (k,v) -> {return k+v;});\r\n        }\r\n        map.compute(\"5\", (k,v) -> {return k+v;}); \/\/ \u952e\u4e0d\u5b58\u5728\uff0cv = null\r\n        System.out.println(\"compute\u4e4b\u540e\u7684\u6620\u5c04 = \"+map);\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n
          HashMap\u8ba1\u7b97\u793a\u4f8b\u7684\u8f93\u51fa\u662f\uff1a<\/p>\n
          compute\u4e4b\u524d\u7684\u6620\u5c04 = {null=10, 1=1, 2=2, 10=null}\r\ncompute\u4e4b\u540e\u7684\u6620\u5c04 = {null=null10, 1=11, 2=22, 5=5null, 10=10null}\r\n<\/code><\/pre>\n
          Java HashMap \u7684 merge \u65b9\u6cd5<\/h3>\n
          \u5982\u679c\u6307\u5b9a\u7684\u952e\u4e0d\u5b58\u5728\u6216\u4e0enull\u76f8\u5173\u8054\uff0c\u5219\u5c06\u5176\u4e0e\u7ed9\u5b9a\u7684\u975enull\u503c\u76f8\u5173\u8054\u3002\u5426\u5219\uff0c\u7528\u7ed9\u5b9a\u7684\u91cd\u6620\u5c04\u51fd\u6570\u7684\u7ed3\u679c\u66ff\u6362\u76f8\u5173\u8054\u7684\u503c\uff0c\u5982\u679c\u7ed3\u679c\u4e3anull\uff0c\u5219\u5220\u9664\u3002<\/p>\n
          package com.Olivia.examples;\r\n\r\nimport java.util.HashMap;\r\nimport java.util.Map;\r\nimport java.util.Map.Entry;\r\n\r\npublic class HashMapMergeExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tMap<String, String> map = new HashMap<>();\r\n\t\tmap.put(\"1\", \"1\");\r\n\t\tmap.put(\"2\", \"2\");\r\n\t\tmap.put(null, \"10\");\r\n\t\tmap.put(\"10\", null);\r\n\r\n\t\tfor (Entry<String, String> entry : map.entrySet()) {\r\n\t\t\tString key = entry.getKey();\r\n\t\t\tString value = entry.getValue();\r\n\t\t\t\/\/ \u5982\u679c\u952e\u6216\u503c\u4e3anull\uff0cmerge\u65b9\u6cd5\u4f1a\u629b\u51faNullPointerException\r\n\t\t\tif(key != null && value != null) \r\n\t\t\tmap.merge(entry.getKey(), entry.getValue(), \r\n\t\t\t\t\t(k, v) -> {return k + v;});\r\n\t\t}\r\n\t\tSystem.out.println(map);\r\n\t\t\r\n\t\tmap.merge(\"5\", \"5\", (k, v) -> {return k + v;}); \/\/ \u952e\u4e0d\u5b58\u5728\r\n\t\tSystem.out.println(map);\r\n\t\t\r\n\t\tmap.merge(\"1\", \"1\", (k, v) -> {return null;}); \/\/ \u65b9\u6cd5\u8fd4\u56denull\uff0c\u56e0\u6b64\u5220\u9664\u8be5\u6761\u76ee\r\n\t\tSystem.out.println(map);\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
          \u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n
          {null=10, 1=11, 2=22, 10=null}\r\n{null=10, 1=11, 2=22, 5=5, 10=null}\r\n{null=10, 2=22, 5=5, 10=null}\r\n<\/code><\/pre>\n
          \u4ee5\u4e0a\u5c31\u662f\u5173\u4e8eJava\u4e2dHashMap\u7684\u5168\u90e8\u5185\u5bb9\uff0c\u5e0c\u671b\u6ca1\u6709\u9057\u6f0f\u4efb\u4f55\u91cd\u8981\u4fe1\u606f\u3002\u5982\u679c\u60a8\u89c9\u5f97\u8fd9\u7bc7\u6587\u7ae0\u6709\u5e2e\u52a9\uff0c\u8bf7\u4e0e\u4ed6\u4eba\u5206\u4eab\u3002\u53c2\u8003\u8d44\u6599\uff1aJava API\u6587\u6863\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
          Java\u7684HashMap\u662fJava\u4e2d\u6700\u6d41\u884c\u7684\u96c6\u5408\u7c7b\u4e4b\u4e00\u3002Java\u7684HashMap\u662f\u57fa\u4e8e\u6563\u5217\u8868\u7684\u5b9e\u73b0\u3002Java\u7684 […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1864,180,1156,1318,252],"class_list":{"0":"post-670","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java-hashmap","8":"tag-java","10":"tag-1318","11":"tag-252"},"yoast_head":"\nJava HashMap\u8be6\u89e3\uff1a\u539f\u7406\u3001\u7528\u6cd5\u4e0e\u5b9e\u4f8b\u6559\u7a0b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u672c\u6587\u8be6\u7ec6\u89e3\u6790Java HashMap\u7684\u539f\u7406\u3001\u5b9e\u73b0\u673a\u5236\u4e0e\u4f7f\u7528\u65b9\u6cd5\u3002\u901a\u8fc7\u5b9e\u4f8b\u6f14\u793aHashMap\u7684\u5e38\u7528\u64cd\u4f5c\uff0c\u5305\u62ec\u6dfb\u52a0\u3001\u5220\u9664\u3001\u904d\u5386\u7b49\u3002\u6df1\u5165\u63a2\u8ba8HashMap\u7684\u6027\u80fd\u7279\u70b9\u3001\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u53ca\u89e3\u51b3\u65b9\u6848\uff0c\u52a9\u60a8\u5168\u9762\u638c\u63e1Java\u4e2d\u54c8\u5e0c\u6620\u5c04\u8868\u7684\u5e94\u7528\u6280\u5de7\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java-hashmap-java\u4e2d\u7684\u54c8\u5e0c\u6620\u5c04\u8868\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java HashMap\u8be6\u89e3\uff1a\u539f\u7406\u3001\u7528\u6cd5\u4e0e\u5b9e\u4f8b\u6559\u7a0b\" \/>\n<meta property=\"og:description\" content=\"\u672c\u6587\u8be6\u7ec6\u89e3\u6790Java HashMap\u7684\u539f\u7406\u3001\u5b9e\u73b0\u673a\u5236\u4e0e\u4f7f\u7528\u65b9\u6cd5\u3002\u901a\u8fc7\u5b9e\u4f8b\u6f14\u793aHashMap\u7684\u5e38\u7528\u64cd\u4f5c\uff0c\u5305\u62ec\u6dfb\u52a0\u3001\u5220\u9664\u3001\u904d\u5386\u7b49\u3002\u6df1\u5165\u63a2\u8ba8HashMap\u7684\u6027\u80fd\u7279\u70b9\u3001\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u53ca\u89e3\u51b3\u65b9\u6848\uff0c\u52a9\u60a8\u5168\u9762\u638c\u63e1Java\u4e2d\u54c8\u5e0c\u6620\u5c04\u8868\u7684\u5e94\u7528\u6280\u5de7\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java-hashmap-java\u4e2d\u7684\u54c8\u5e0c\u6620\u5c04\u8868\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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