题解 | #从尾到头打印链表#
从尾到头打印链表
https://www.nowcoder.com/practice/d0267f7f55b3412ba93bd35cfa8e8035
/** * 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) { if (listNode == null) { return new ArrayList<Integer>(); } ArrayList<Integer> valList = new ArrayList<>(); while(true) { valList.add(listNode.val); if(listNode.next == null) { break; } listNode = listNode.next; } ArrayList<Integer> result = new ArrayList<>(); for(int index = valList.size() - 1; index >=0; index--) { result.add(valList.get(index)); } return result; } }
先将链表的数据拿出来, 放入集合,再对集合进行操作;