ReverseLinkedList_206

https://leetcode.com/problems/reverse-linked-list/

image.png

（图片来源https://leetcode.com/problems/reverse-linked-list/

）

public ListNode reverseList(ListNode head) {
        /* iterative solution */
        ListNode newHead = null;
        while (head != null) {
            ListNode next = head.next;
            head.next = newHead;
            newHead = head;
            head = next;
        }
        return newHead;
    }