技术问答hashmap鐨刾utall鏂规硶鎬庝箞浣跨敤 - 扬州沐宇科技

HashMap鐨刾utAll()鏂规硶鐢ㄤ簬灏嗗彟涓€涓狹ap鐨勬墍鏈夐敭鍊煎娣诲姞鍒板綋鍓岺ashMap涓€?/p>

浣跨敤putAll()鏂规硶鐨勮娉曞涓嬶細

HashMap.putAll(Map<? extends K, ? extends V> map)

鍏朵腑锛?code>map涓鸿娣诲姞鍒板綋鍓岺ashMap涓殑鍙︿竴涓狹ap銆?/p>

浠ヤ笅鏄娇鐢╬utAll()鏂规硶鐨勭ず渚嬶細

HashMap<String, Integer> map1 = new HashMap<>();
map1.put("A", 1);
map1.put("B", 2);

HashMap<String, Integer> map2 = new HashMap<>();
map2.put("C", 3);
map2.put("D", 4);

map1.putAll(map2); // 灏唌ap2涓殑閿€煎娣诲姞鍒癿ap1涓?/span>

System.out.println(map1); // 杈撳嚭: {A=1, B=2, C=3, D=4}

鍦ㄤ笂杩扮ず渚嬩腑锛岄鍏堝垱寤轰簡涓や釜HashMap瀵硅薄map1鍜?code>map2锛岀劧鍚庝娇鐢╬ut()鏂规硶鍚?code>map1鍜?code>map2涓坊鍔犻敭鍊煎銆傛渶鍚庯紝浣跨敤putAll()鏂规硶灏?code>map2涓殑閿€煎娣诲姞鍒?code>map1涓紝浠庤€屽疄鐜板悎骞朵袱涓狧ashMap鐨勬晥鏋溿€?/p>