import objectdraw.*;

/*
 * An empty list of balls.  This implements the ball list
 * interface, but only the isEmpty method should be used.
 */
public class EmptyBallList implements BallListInterface {

        public EmptyBallList() {}

        public boolean isEmpty() {
                return true;
        }
        
        // return null as a default value
        public FilledOval getFirst() {
                return null;
        }
        
        // return null as a default value
        public BallListInterface getRest() {
                return null;
        }
        
}