import java.util.HashMap;

public class MapEx
{
    public void doExample()    {
	HashMap<Integer, String> m = new HashMap<>();
	System.out.println(m.isEmpty() + " " + m.toString());
	System.out.println(m.put(5,"A") + " " + m.toString());
	System.out.println(m.put(7,"B") + " " + m.toString());
	System.out.println(m.put(2,"E") + " " + m.toString());
	System.out.println(m.put(8,"A") + " " + m.toString());
	System.out.println(m.put(2,"Q") + " " + m.toString());

	System.out.println(m.get(7) + " " + m.toString());
	System.out.println(m.get(4) + " " + m.toString());
	System.out.println(m.remove(2) + " " + m.toString());
	System.out.println(m.remove(5) + " " + m.toString());
	System.out.println(m.isEmpty() + " " + m.toString());
	System.out.println(m.entrySet() + " " + m.toString());
	System.out.println(m.values() + " " + m.toString());
    }
    public static void main(String[] args)
    {
	(new MapEx()).doExample();
    }
}