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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 addTwoNumbers(ListNode l1, ListNode l2) {
 
        int carry = 0;
 
        ListNode t1 = l1;
        ListNode t2 = l2;
 
        ListNode dummy = new ListNode(-1);
        ListNode mover = dummy;
 
 
        while (t1 != null || t2 != null || carry != 0) {
 
            int val1 = 0;
 
            if (t1 != null)
                val1 = t1.val;
 
 
            int val2 = 0;
 
            if (t2 != null)
                val2 = t2.val;
 
 
            int sum = val1 + val2 + carry;
 
            int data = sum % 10;
 
            ListNode newNode = new ListNode(data);
 
            mover.next = newNode;
            mover = mover.next;
 
 
            carry = sum / 10;
 
 
            if (t1 != null)
                t1 = t1.next;
 
            if (t2 != null)
                t2 = t2.next;
        }
 
 
        return dummy.next;
    }
}

Main.java:12: error: cannot find symbol
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
                                  ^
  symbol:   class ListNode
  location: class Solution
Main.java:12: error: cannot find symbol
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
                                               ^
  symbol:   class ListNode
  location: class Solution
Main.java:12: error: cannot find symbol
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
           ^
  symbol:   class ListNode
  location: class Solution
Main.java:16: error: cannot find symbol
        ListNode t1 = l1;
        ^
  symbol:   class ListNode
  location: class Solution
Main.java:17: error: cannot find symbol
        ListNode t2 = l2;
        ^
  symbol:   class ListNode
  location: class Solution
Main.java:19: error: cannot find symbol
        ListNode dummy = new ListNode(-1);
        ^
  symbol:   class ListNode
  location: class Solution
Main.java:19: error: cannot find symbol
        ListNode dummy = new ListNode(-1);
                             ^
  symbol:   class ListNode
  location: class Solution
Main.java:20: error: cannot find symbol
        ListNode mover = dummy;
        ^
  symbol:   class ListNode
  location: class Solution
Main.java:41: error: cannot find symbol
            ListNode newNode = new ListNode(data);
            ^
  symbol:   class ListNode
  location: class Solution
Main.java:41: error: cannot find symbol
            ListNode newNode = new ListNode(data);
                                   ^
  symbol:   class ListNode
  location: class Solution
10 errors

Standard output is empty