分析
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/** * Definition for ListNode.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int val) {
* this.val = val;
* this.next = null;
* }
* }
*/ public class Solution {
/**
* @param head: The head of linked list.
* @return: The new head of reversed linked list.
*/
public ListNode reverse(ListNode head) {
// write your code here
if(head == null) return null;
ListNode last = null;
while(head.next != null){
ListNode tmp = head.next;
head.next = last;
last = head;
head = tmp;
}
head.next = last;
return head;
}
} |