ReverseLinkedList.java

package com.leetcode;

public class ReverseLinkedList {

    //https://leetcode.com/problems/reverse-linked-list/
    class Solution {
        public ListNode reverseList(ListNode head) {

            ListNode prev = null;
            while(head!= null){
                ListNode next = head.next;
                head.next = prev;
                prev = head;
                head = next;
            }
            return prev;

        }
    }

    public class ListNode {
        int val;
        ListNode next;

        ListNode() {
        }

        ListNode(int val) {
            this.val = val;
        }

        ListNode(int val, ListNode next) {
            this.val = val;
            this.next = next;
        }
    }
}