Add Two Numbers

https://leetcode.com/problems/add-two-numbers/

You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
public class Solution {
    public static ListNode addTwoNumbers(ListNode l1, ListNode l2) {
    int j=0,x,y;
    ListNode an=new ListNode(0);
    ListNode p=an;
    while(l1!=null||l2!=null){
        if(l1!=null){x=l1.val;l1=l1.next;}
        else x=0;
        if(l2!=null){y=l2.val;l2=l2.next;}
        else y=0;
        
        int re=x+y+j;
        if(re>=10){re-=10;j=1;}
        else j=0;
        ListNode node=new ListNode(re);
        p.next=node;p=node;
    }
    if(j==1){
        ListNode node=new ListNode(1);
        p.next=node;
    }
    return an.next;
        
    }
}