剑指offer-二叉树的深度

class TreeNode {
    int val = 0;
    TreeNode left = null;
    TreeNode right = null;

    public TreeNode(int val) {
        this.val = val;

    }

}

public class Solution {
    public int TreeDepth(TreeNode root) {
        return root == null ? 0 : Math.max(TreeDepth(root.left), TreeDepth(root.right))+1;
    }

/****************************************************/
    public static void main(String[] args) {
        TreeNode t = new TreeNode(1);
        t.left = new TreeNode(2);
        t.left.left = new TreeNode(3);
        t.left.left.left = new TreeNode(4);
        t.left.left.right = new TreeNode(5);
        Solution s = new Solution();
        System.out.println(s.TreeDepth(t));
    }
}