牛客网 - 剑指Offer - 考点：链表 题目：从尾到头打印链表

题目描述

输入为链表的表头

输出为需要打印的“新链表”的表头

/**
*    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> a = new ArrayList<Integer>();
ListNode temp = listNode;
while(temp != null){
a.add(new Integer(temp.val));
temp = temp.next;
}
Integer b ;
for(int i=0; i<a.size()/2;i++){
b = a.get(i);
a.set(i, a.get(a.size()-i-1));
a.set(a.size()-i-1,b);
}
return a;

}
}