private void updateSuccessorList(List<IChordNode> _newList) {
        successorList.clear();
        successorList.add(fingers[1]);
        successorList.addAll(_newList);
        if (successorList.size() > r) {
            for (int i = r; i < successorList.size(); i++) {
                successorList.remove(i);
            }
        }
    }