public class Demo
{
    public static void main(String[] args)
    {
	MyQueue<Integer> s = new ListQueue<Integer>();

	s.enqueue(1);
	s.enqueue(2);
	s.enqueue(3);
	s.enqueue(4);
	System.out.println( s );
	System.out.println( s.dequeue() );
	System.out.println( s );
	System.out.println( s.dequeue() );
	System.out.println( s );
	System.out.println( s.dequeue() );
	System.out.println( s );
	System.out.println( s.dequeue() );
	System.out.println( s );
    }

}