public class Edge<E>
{
    private final Node<E> from;
    private final Node<E> too;
    private final String id;
    
    public Edge(Node<E> f, Node<E> t, String id)
    {
	from=f;
	too=t;
	this.id=id;
    }
    public Node<E> getFrom()
    {
	return from;
    }
    public Node<E>getToo()
    {
	return too;
    }
    public String toString()
    {
	return String.format("<%s  F:%s  T:%s>", this.id, from.toString(), too.toString());
    }
}