Iterator over HashMap

How to use iterator to go through a HashMap?

 public static void printMap(Map mp) {  
   Iterator it = mp.entrySet().iterator();  
   while (it.hasNext()) {  
     Map.Entry pair = (Map.Entry)it.next();  
     System.out.println(pair.getKey() + " = " + pair.getValue());  
     it.remove(); // avoids a ConcurrentModificationException  
   }  
 }