Map Interface in Java

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

public class MapImplementation {
    public MapImplementation() {
        super();
    }
   
    public static void main(String args[]){
        Map<Integer,String> map = new HashMap<Integer,String>();
       
        // Addition of element in map

        map.put(1,"Shekhar");
        map.put(2, "Gaurva");
       
        // One way to iterate map


        Set<Integer> keySet = map.keySet();

        Iterator<Integer> iterator = keySet.iterator();
       
        while(iterator.hasNext()){

            Integer key = iterator.next();
           
            String value = map.get(key);
           
            System.out.println("key "+key +" value "+value);
        }
       
        // Another  way to iterate map

        Set<Map.Entry<Integer, String>> entrySet = map.entrySet();

        Iterator<Map.Entry<Integer, String>> iterator0 = entrySet.iterator();
       
        while(iterator0.hasNext()){

            Map.Entry<Integer, String> entry = iterator0.next();

            Integer key = entry.getKey();

            String value = entry.getValue();
           
            System.out.println("key "+key +" value "+value);
        }


    }
}