g

```java

class Solution {

    public ListNode reverseList(ListNode head) {

        ListNode current = head;

        ListNode pre = null;

        ListNode newHead = null;

        while(current != null){

            ListNode next = current.next;

            if (next == null) {

                newHead = current;

            }

            current.next = pre;

            pre = current;

            current = next;

        }

        return newHead;

    }

}

```