/*
 * This was used in class to show the use of libraries (packages).  In
 * this case the package is "java.util" and the library class we use
 * is "Vector".
 */

import java.util.*;

public class MyStack {
    Vector items;
    public MyStack() {
	items = new Vector();
    }
    public void push(Object item) {
	items.addElement(item);
    }
    public Object pop() {
	int size = items.size();
	Object obj = items.elementAt (size - 1);
	items.removeElementAt (size - 1);
	return obj;
    }
    public boolean empty() {
	return items.isEmpty();
    }
}