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  1. import java.util.HashMap;
  2. import java.util.Map;
  3.  
  4. class Ideone {
  5.     public static <K, V> Map<K, V> mapDifference(Map<? extends K, ? extends V> left, Map<? extends K, ? extends V> right) {
  6.         Map<K, V> difference = new HashMap<>();
  7.         difference.putAll(left);
  8.         difference.putAll(right);
  9.         difference.entrySet().removeAll(right.entrySet());
  10.         return difference;
  11.     }
  12.  
  13.     public static void main(String[] args) {
  14.         Map<String, String> map1 = new HashMap<>();
  15.         Map<String, String> map2 = new HashMap<>();
  16.  
  17.         map1.put("a", "1");
  18.         map1.put("b", "2");
  19.         map1.put("key3", "44");
  20.  
  21.         map2.put("b", "2");
  22.         map2.put("d", "4");
  23.         map2.put("third key", "44");
  24.  
  25.         System.out.println(mapDifference(map2, map1));
  26.     }
  27. }
Success #stdin #stdout 0.04s 4386816KB
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Standard input is empty
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{third key=44, d=4}
https://ideone.com/xvySsC
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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