What will be the output of the following Java program?

import java.util.*;
class Maps 
{
    public static void main(String args[]) 
    {
        TreeMap obj = new TreeMap();
        obj.put("A", new Integer(1));
        obj.put("B", new Integer(2));
        obj.put("C", new Integer(3));
        System.out.println(obj.entrySet());
    }
}