题目描述
输入一个链表,反转链表后,输出链表的所有元素。
/*
public class ListNode {
int val;
ListNode next = null;
ListNode(int val) {
this.val = val;
}
}*/
import java.util.Stack;
public class Solution {
public ListNode ReverseList(ListNode head) {
ListNode pre = null;
ListNode next = null;
while(head != null)
{
next = head.next;
head.next = pre;
pre = head;
head = next;
}
return pre;
}
}