Java – Remove elements in Map

 map.remove(object);

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

public class MapRemoveExample {

    public static void main(String[] args) {

        Map<Object,String> mp=new HashMap<Object, String>();

        mp.put(new Integer(2), "Two");
        mp.put(new Integer(1), "One");
        mp.put(new Integer(3), "Three");
        mp.put(new Integer(4), "Four");

        // remove map object 
        mp.remove(new Integer(3)); // remove map by object

        Set s=mp.entrySet();

        Iterator it=s.iterator();

        while(it.hasNext())
        {
            Map.Entry m =(Map.Entry)it.next();

            int key=(Integer)m.getKey();

            String value=(String)m.getValue();

            System.out.println("Key :"+key+"  Value :"+value);
        }
    }
}