public class DequeFromList extends ListReferenceBased
    implements DequeInterface{
    public DequeFromList(){
	super();
    }
    public Object peekFirst(){
	return get(0);
    }
    public Object removeFirst(){
	Object ret = get(0);
	remove(0);
	return ret;
    }
    public void addFirst (Object o){
	add(0,o);
    }
    public Object peekLast(){
	return get(size()-1);
    }
    public Object removeLast(){
	Object ret = get(size()-1);
	remove (size()-1);
	return ret;
    }
    public void addLast (Object o){
	add (size(),o);
    }
}