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/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
class Solution {
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        int carry = 0;
        ListNode root = new ListNode(0);
        ListNode tempNode = root;
        int temp = 0;
        while(l1!=null && l2!=null){
            temp = l1.val + l2.val + carry;
            tempNode.next = new ListNode(temp%10);
            carry = temp/10;
            tempNode = tempNode.next;
            l1 = l1.next;
            l2 = l2.next;
        }
 
        while(l1!=null){
            temp = l1.val + carry;
            tempNode.next = new ListNode(temp%10);
            carry = temp/10;
            tempNode = tempNode.next;
            l1 = l1.next;
        }
 
        while(l2!=null){
            temp = l2.val + carry;
            tempNode.next = new ListNode(temp%10);
            carry = temp/10;
            tempNode = tempNode.next;
            l2 = l2.next;
        }
 
        while(carry!=0){
            tempNode.next = new ListNode(carry);
            carry/=10;
            tempNode = tempNode.next;
        }
 
        return root.next;
    }
}

Main.java:10: error: cannot find symbol
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
                                  ^
  symbol:   class ListNode
  location: class Solution
Main.java:10: error: cannot find symbol
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
                                               ^
  symbol:   class ListNode
  location: class Solution
Main.java:10: error: cannot find symbol
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
           ^
  symbol:   class ListNode
  location: class Solution
Main.java:12: error: cannot find symbol
        ListNode root = new ListNode(0);
        ^
  symbol:   class ListNode
  location: class Solution
Main.java:12: error: cannot find symbol
        ListNode root = new ListNode(0);
                            ^
  symbol:   class ListNode
  location: class Solution
Main.java:13: error: cannot find symbol
        ListNode tempNode = root;
        ^
  symbol:   class ListNode
  location: class Solution
Main.java:17: error: cannot find symbol
            tempNode.next = new ListNode(temp%10);
                                ^
  symbol:   class ListNode
  location: class Solution
Main.java:26: error: cannot find symbol
            tempNode.next = new ListNode(temp%10);
                                ^
  symbol:   class ListNode
  location: class Solution
Main.java:34: error: cannot find symbol
            tempNode.next = new ListNode(temp%10);
                                ^
  symbol:   class ListNode
  location: class Solution
Main.java:41: error: cannot find symbol
            tempNode.next = new ListNode(carry);
                                ^
  symbol:   class ListNode
  location: class Solution
10 errors

Standard output is empty