public interface ListInterface
{
	//1. Tell the students this is the same interface discussed
	//   in class. I removed all the functions except display()
	//   and isEmpty()to demostrate the DoubleEndedList
	//   (a.k.a, DEList) described on pages 143-148 and given
	//   as a project on page 149 problem #2.

    public boolean isEmpty();
	public void display();
} // end ListInterface