/**
 * @author Muhammad Bagus Istighfar
 * @version 28-10-20
 */
import java.util.*;
public class Hashmap
{
    public static void main(String args[])
    {
    HashMap<Integer,String> hm=new HashMap<Integer,String>();
        hm.put(100,"Bagus");
        hm.put(101,"Ibram");
        hm.put(102,"Eka");
        hm.put(null, "Nova");
       
    for(Map.Entry m:hm.entrySet())
    {
        System.out.println(m.getKey()+" "+m.getValue());
        }
    }
}