/*
 * This was used in class to show inheritance.
 */
public class MyImprovedStack extends MyStack {

    public Object pop() {
	if (n <= 0) {
	    return null;
	}
	return items[--n];
    }

    public Object peek() {
	if (n <= 0) {
	    return null;
	}
	return items[n-1];
    }
}