java 二叉树的深度和高度

https://blog.youkuaiyun.com/cobbyer/article/details/107244046

	// 深度
    //(递归方式)获取以root为根节点的子树的深度:从叶子节点到达根节点的最长路径
    public int getDept(TreeNode root, int dept){
 
        if(root == null){
            return dept;
        }
        int leftDept = getDept(root.left, dept+1);
        int rightDept = getDept(root.right, dept+1);
 
        return Math.max(leftDept, rightDept);
    }

	// 高度
    /**
     * (递归方式)求树的高度:从叶子节点到达根节点的最长路径
     * @param root
     * @return
     */
    public int getTreeHeight(TreeNode root) {
    	if (root == null) {
			return 0;
		}
    	int leftHeight = getTreeHeight(root.left);
    	int rightHeight = getTreeHeight(root.right);
    	return leftHeight > rightHeight? leftHeight+1 : rightHeight+1;
    	
    }