public static void main(String[] args) {
        ListNode head = new ListNode(1);
        ListNode tmpHead = head;
        for (int i = 2; i <= 5; ++i){
            ListNode tmp = new ListNode(i);
            tmpHead.next = tmp;
            tmpHead = tmp;
        }

        Rotate_List rl = new Rotate_List();
        ListNode node = rl.rotateRight(head, 7);
        rl.printList(node);
    }