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package stack; import java.util.NoSuchElementException; import java.util.Vector; /** *

A MyStringStack

* is a class that implements a simple (LIFO) stack object. It makes use of the Vector {@link java.util.Vector} *

It has four basic operations: * push() to push an element onto the stack * pop() to retrieve the last pushed element * isEmpty() to verify whether the stack has no more elements * clear() to empty the stack. *

* @author Swarnalatha Ashok * @version 1.0 2008-07-16 * @since JDK 1.5 */ public class MyStringStack { private Vector v = new Vector (); public void push (String newElement) { if (newElement != null) v.add (newElement); } /** * Returns a String object that was pushed the last on the stack. *

This method always returns a valid String.

*

If there is no element it throws a NoSuchElementException exception.

* * @return the String on top of the stack * @throws NoSuchElementException if there are no elements on the stack * @see String */ public String pop() throws NoSuchElementException { //throw new NoSuchElementException(); String result = v.lastElement(); v.remove(result); System.out.println("hello"); return result; //return v.lastElement(); } public boolean isEmpty() { return v.isEmpty(); } public void clear() { v = new Vector (); } }
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