Add Two Numbers

题目描述：

You are given two non-empty linked lists representing two non-negative integers. 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.

You may assume the two numbers do not contain any leading zero, except the number 0 itself.

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

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public ListNode addTwoNumbers(ListNode l1, ListNode l2) {    ListNode fake = new ListNode(0);    ListNode t=fake, t1=l1, t2=l2;    int a1, a2, r = 0;    while (t1!=null || t2!=null || r!=0) {        a1 = t1==null ? 0:t1.val;        a2 = t2==null ? 0:t2.val;        r += a1 + a2;        t.next = new ListNode(r%10);        r /= 10;        t = t.next;        if (t1!=null) t1 = t1.next;        if (t2!=null) t2 = t2.next;    }    return fake.next;}