public static BTreeNode newNode(int data){
            BTreeNode node = new BTreeNode();
            node.keys[0] = data;
            node.isLeaf = true;
            node.n = 1;
            return node;
        }
http://www.geeksforgeeks.org/b-tree-set-1-insert-2/
http://www.geeksforgeeks.org/b-tree-set-1-introduction-2/
src/com/interview/tree/BTree.java