Leetcode 110. Balanced Binary Tree

Given a binary tree, determine if it is height-balanced.

For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more than 1.

public class Solution {
    public boolean isBalanced(TreeNode root) {
        if(root == null) return true;
        int left = getDepth(root.left);
        int right = getDepth(root.right);
        boolean isBalance = Math.abs(left-right)>1?false:true;
        return isBalance&&isBalanced(root.left)&&isBalanced(root.right);
    }
    private int getDepth(TreeNode root){
        if(root == null) return 0;
        //if(root.left==null&&root.right==null) return 1;
        int depth = 1;
        int leftDepth = getDepth(root.left)+1;
        int rightDepth = getDepth(root.right)+1;
        return leftDepth>rightDepth?leftDepth:rightDepth;
    }
}