ReverseLinkedList.java

/**
 * 206. Reverse Linked List
 * @author LBW
 */
public class ReverseLinkedList {
    public ListNode reverseList(ListNode head) {
        if (head == null || head.next == null)
            return head;
        ListNode prev = null, cur = head;
        while (cur != null) {
            ListNode tmp = cur.next;
            cur.next = prev;
            prev = cur;
            cur = tmp;
        }
        return prev;
    }

    public static void main(String[] args) {
        ListNode head = new ListNode(1);
        head.next = new ListNode(2);
        head.next.next = new ListNode(3);
        head.next.next.next = new ListNode(4);
        head.next.next.next = new ListNode(5);
        ReverseLinkedList reverseLinkedList = new ReverseLinkedList();
        reverseLinkedList.reverseList(head);
    }
}