public class Main { public static void main(String[] args) { BinaryTreeArray binaryTree = new BinaryTreeArray(9); binaryTree.insert("N1"); binaryTree.insert("N2"); binaryTree.insert("N3"); binaryTree.insert("N4"); binaryTree.insert("N5"); binaryTree.insert("N6"); binaryTree.insert("N7"); binaryTree.insert("N8"); binaryTree.insert("N9");