LeetCode 206. Reverse Linked List (Tag:LinkedList)

/**
* Definition for singly-linked list.
* public class ListNode {
*     int val;
*     ListNode next;
*     ListNode(int x) { val = x; }
* }
*/class Solution {public ListNode reverseList(ListNode head) {
    ListNode current = head;
    ListNode prev = null;
    while(current != null) {
        ListNode next = current.next;
        current.next = prev;
        prev = current;
        current = next;
    }
    return prev;}}