Queue queue = new Queue();
queue.push( "bat" );
queue.push( "cat" );
queue.push( "dog" );
System.out.println( "queue = " + queue );
System.out.println();
System.out.println( "Non-destructively enumerate the Queue." );
Enumeration e = queue.elements();
while ( e.hasMoreElements() )
System.out.println( e.nextElement() );
System.out.println();
System.out.println( "Pop and print each element." );
while ( !queue.isEmpty() )
System.out.println( queue.pop() );
