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

Main.java:12: error: cannot find symbol
    public ListNode reverseList(ListNode head) {
                                ^
  symbol:   class ListNode
  location: class Solution
Main.java:12: error: cannot find symbol
    public ListNode reverseList(ListNode head) {
           ^
  symbol:   class ListNode
  location: class Solution
Main.java:15: error: cannot find symbol
        ListNode cur = head;
        ^
  symbol:   class ListNode
  location: class Solution
Main.java:16: error: cannot find symbol
        ListNode prev = null;
        ^
  symbol:   class ListNode
  location: class Solution
Main.java:17: error: cannot find symbol
        ListNode next = null;
        ^
  symbol:   class ListNode
  location: class Solution
5 errors

Standard output is empty