111. Minimum Depth of Binary Tree java solutions

Given a binary tree, find its minimum depth.

The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.

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/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
public class Solution {
    public int minDepth(TreeNode root) {
        if(root == null) return 0;
        if(root.left == null) return 1 + minDepth(root.right);
        if(root.right == null) return 1 + minDepth(root.left);
        return Math.min(minDepth(root.left),minDepth(root.right)) + 1;
    }
}