输入个链表的头结点，从尾到头反过来打印出每个结点的值

输入个链表的头结点，从尾到头反过来打印出每个结点的值

 public static void printListInverselyUsingIteration(ListNode root) {
        Stack<ListNode> stack = new Stack<>();
        while (root != null) {
            stack.push(root);
            root = root.nxt;
        }
        ListNode tmp;
        while (!stack.isEmpty()) {
            tmp = stack.pop();
            System.out.print(tmp.val + " ");
        }
    }