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Inorder traversal Iterative approach
package com.interviewbytes.trees;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Deque;
import java.util.List;
public class InorderTraversalIterative {
public List<Integer> inorderTraversal(TreeNode root) {
List<Integer> list = new ArrayList<>();
Deque<TreeNode> stack = new ArrayDeque<>();
TreeNode current = root;
while (current != null || !stack.isEmpty()) {
if (current != null) {
current = current.left;
} else {
current = stack.pop();
current = current.right;
return list;
package com.interviewbytes.trees;
public class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) {
val = x;
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