// Test class
public class StackExceptionDemo
{
   public static void main( String[] args )
   {
      int   x;
      Stack s;		//Stack interface reference 

      s = new ArrayStack( 6 );	// Will cause underflow, to see overflow simply make the size of array less than 4

      try
      {
         x = 4; s.push(x); System.out.println("push(" + x + ");");
         x = 7; s.push(x); System.out.println("push(" + x + ");");
         x = 8; s.push(x); System.out.println("push(" + x + ");");
         x = 9; s.push(x); System.out.println("push(" + x + ");");

         x = s.pop(); System.out.println("pop() ---> " + x );
         x = s.pop(); System.out.println("pop() ---> " + x );
         x = s.pop(); System.out.println("pop() ---> " + x );
         x = s.pop(); System.out.println("pop() ---> " + x );
         x = s.pop(); System.out.println("pop() ---> " + x );
      }
      catch ( StackException e )
      {
         System.out.println("Error detected: " + e.getMessage() );
	 //System.exit(1);
      }
   }
}