2 Add Two Numbers.JAVA

class Solution {
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode dummy = new ListNode(0);
        ListNode res = dummy;
        int carry = 0;
        while(l1 != null && l2 != null){
            int value = l1.val + l2.val + carry;
            carry = value / 10;
            dummy.next = new ListNode(value % 10);
            dummy = dummy.next;
            l1 = l1.next;
            l2 = l2.next;
        }
        while(l1 != null){
            int value = l1.val + carry;
            carry = value / 10;
            dummy.next = new ListNode(value % 10);
            dummy = dummy.next;
            l1 = l1.next;
        }
         while(l2 != null){
            int value = l2.val + carry;
            carry = value / 10;
            dummy.next = new ListNode(value % 10);
            dummy = dummy.next;
            l2 = l2.next;
        }
        if(carry != 0){
            dummy.next = new ListNode(carry);
        }
        return res.next;
    }
}