Creating, Inserting and Modifying Hash Map

 /*  
 Creating, Inserting, Iterating and Modifying HashMap  
 */  
 import java.util.*;   
 class HashMapCreat  
 {  
 public static void main(String[]args)  
      {  
           HashMap<Integer,String> words = new HashMap<Integer,String>();   
           // constructing HashMap   
           words.put(1,"one");   
           words.put(2,"Two");   
           System.out.println(words); // printing all   
           Set e = words.entrySet();  
           // Iterating through HashMap.  
           for(Iterator i = e.iterator();i.hasNext();)  
                {  
                     Map.Entry me = (Map.Entry)i.next();   
                     System.out.print(me.getKey()+"=");   
                     System.out.println(me.getValue());  
                }  
          // Duplicates   
           Object o = words.put(2,"Two");   
           if(o !=null)  
             System.out.println("Noo....");  
           else   
                System.out.println("Added");  
           System.out.println(words); // printing all   
           // Modifications   
           words.put(1,"ONE");  
           System.out.println(words);  
     }  
 }