msuganthan

  static class BTreePrinter {

    public static <T extends Comparable<?>> void printNode(Node root) {
      int maxLevel = BTreePrinter.maxLevel(root);

      printNodeInternal(Collections.singletonList(root), 1, maxLevel);
    }

    private static <T extends Comparable<?>> void printNodeInternal(List<Node> nodes, int level, int maxLevel) {
      if (nodes.isEmpty() || BTreePrinter.isAllElementsNull(nodes))