Node<E> forward() {
            Node<E> f = successor();
            return (f == null || f.isSpecial()) ? null : f;
        }
Node<E> forward() {
            Node<E> f = successor();
            return (f == null || f.isSpecial()) ? null : f;
        }
Node < E > forward ( ) { Node < E > f = successor ( ) ; return ( f == null || f . isSpecial ( ) ) ? null : f ; }
Returns the next node containing a nondeleted user element.
Use for forward list traversal.

@return successor, or null if no such
Returns the next node containing a nondeleted user element . Use for forward list traversal .