Reverse Linked List

public class Solution {
public ListNode reverseList(ListNode head) {
if(head==null || head.next==null)   return head;
ListNode dummy = new ListNode(-1);
dummy.next = head;
ListNode cur = head.next;
while(cur != null)
{
ListNode next = cur.next;
cur.next = dummy.next;
dummy.next = cur;
cur = next;
}
head.next = null;
return dummy.next;
}
}