从尾到头打印链表

/***    public class ListNode {*        int val;*        ListNode next = null;**        ListNode(int val) {*            this.val = val;*        }*    }**/import java.util.ArrayList;public class Solution {    public ArrayList<Integer> printListFromTailToHead(ListNode listNode) {        ArrayList<Integer> list = new ArrayList<Integer>();        while (listNode != null) {            list.add(0, listNode.val);            listNode = listNode.next;        }        return list;    }}