class X {

    class Node {

        Node skipForward2(Predicate<Node> skipWhile) {
            Node node = this;
            while (skipWhile.test(node)) {
            Node next = node.nextNode();
            if (next == null) break;
            node = next;
          }
          return node;
        }

        Node nextNode() {
      return null;
    }
  }
}