An example of how to traverse a map.

how_to_traverse_map.java

  public static void main(String[]args){
        Map<Integer, String> map = new HashMap<Integer, String>();
        map.put(5, "pac");
        map.put(6, "got");

        //
        // Iterator
        //
        System.out.println("Iterator way");
        Iterator it = map.entrySet().iterator();
        while (it.hasNext()) {
            Map.Entry pairs = (Map.Entry)it.next();
            System.out.println(pairs.getKey() + " " + pairs.getValue());
        }

        //
        // For loop
        //
        System.out.println("For-loop way");
        for(Integer key : map.keySet()) {
            System.out.println(key + " " + map.get(key));
        }
   }