Common summary

javaSE

1. traversing map

  Map <Integer, Integer> Map = new new the HashMap <Integer, Integer> (); 
        map.put ( . 1 , 2 );
         //   the entrySet traversal using (most common) and when the key value required 
        for (of Map.Entry < Integer, Integer> entry: EnumMap.entrySet ()) { 
            . the System OUT .println ( " Key = " + entry.getKey () + " , value = " + entry.getValue ()); 
        }