I want to know how to use methods furnished below in this program???

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

public class MapInterfaceExample implements Map<String, String>
{
    public static void main(String[] args)
    {
        Map<String,String> PNA = new HashMap<String, String>();
    	
     	PNA.put("BTM/BWL", "Virender sehwag");
        PNA.put("BWL", "Zaheer khan");
        PNA.put("WKR", "M S Dhoni");
        PNA.put("BTM", "Sachin tendulkar");
                   	
        System.out.println(PNA);
    }

@Override
	public void clear() 
	{
	
	}

@Override
	public boolean containsKey(Object key) 
	{
		return false;
	}

@Override
	public boolean containsValue(Object value) 
	{
		return false;
	}

@Override
	public Set<java.util.Map.Entry<String, String>> entrySet() 
	{
		return null;
	}

@Override
	public String get(Object key) 
	{
		return null;
	}

@Override
	public boolean isEmpty() 
	{
		return false;
	}

@Override
	public Set<String> keySet() 
	{
		return null;
	}

@Override
	public String put(String key, String value) 
	{
		put("BWL","Praveen kumar");
		put("FLD","Suresh raina");
		return null;
	}

@Override
	public void putAll(Map<? extends String, ? extends String> m) 
	{
	
	}

@Override
	public String remove(Object key) 
	{
		return null;
	}

@Override
	public int size() 
	{
		return 0;
	}

@Override
	public Collection<String> values() 
	{
		return null;
	}
}

Welcome to the Ranch

Your question is not clear. You can use the methods by calling them on an instance of your MapInterfaceExample class. But they do nothing useful.

Do you mean how would you implement them?

Be warned, your current implementation of put will lead to a StackOverflowError. When you call put, it calls put, which calls put, which calls put, etc.

yes Mr Campbell i want to know how to implement them!!!

personally, i would comment all of them out but one, and implement it first. implement it, test it, test it some more, then test it again. Note that when testing, you often have to write 'throw-away' code - code that is used ONLY for testing, but won't then be in your final program.

Which method you do first is sort of dependent on a few things. You can't really test your clear() method if there is nothing in the collection, so it doesn't make sense to implement it first...and Rob is right - your put() method has problems.