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  1. class MyMap extends java.util.HashMap{
  2.      @Override
  3.      public void putAll(java.util.Map mapToAdd){
  4.           java.util.Iterator iterKeys = keySet().iterator();
  5.           while(iterKeys.hasNext()){
  6.                String currentKey = (String)iterKeys.next();
  7.                if(mapToAdd.containsKey(currentKey)){
  8.                     mapToAdd.put(currentKey, new Integer(Integer.parseInt(get(currentKey).toString()) + Integer.parseInt(mapToAdd.get(currentKey).toString())));
  9.                }else{
  10.                     mapToAdd.put(currentKey, get(currentKey));
  11.                }
  12.           }
  13.           super.putAll(mapToAdd);
  14.      }
  15.      public static void main(String args[]){
  16.          MyMap m1 = new MyMap();
  17.          m1.put("One", new Integer(1));
  18.          m1.put("Two", new Integer(2));
  19.          m1.put("Three", new Integer(3));
  20.          MyMap m2 = new MyMap();
  21.          m2.put("One", new Integer(4));
  22.          m2.put("Two", new Integer(5));
  23.          m2.put("Three", new Integer(6));
  24.          m1.putAll(m2);
  25.          System.out.println(m1);
  26.      }
  27. }
Success #stdin #stdout 0.07s 380224KB
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Standard input is empty
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{Three=9, One=5, Two=7}
https://ideone.com/2BHYUr
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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