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test16.java
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package byteDance;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
/**
* Created by lizeyang on 2020/5/13.
* 二叉树非递归中序遍历
*/
public class test16 {
public static List<Integer> test(TreeNode root) {
List<Integer> list = new ArrayList<>();
if (root == null) {
return list;
}
Stack<TreeNode> stack = new Stack<>();
while (!stack.isEmpty() || root != null) {
if (root != null) {
stack.push(root);
root = root.left;
} else {
root = stack.pop();
list.add(root.val);
root = root.right;
}
}
return list;
}
public static void main(String[] args) {
TreeNode root = new TreeNode(5);
root.left = new TreeNode(4);
root.right = new TreeNode(8);
root.left.left = new TreeNode(3);
root.right.left = new TreeNode(7);
root.right.left.left = new TreeNode(6);
root.right.right = new TreeNode(9);
List<Integer> res = test(root);
for (int i = 0; i < res.size(); i++) {
System.out.print(res.get(i) + " ");
}
}
}