leetcode:Add Two Numbers(java)

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package Leetcode;



/**
 * 题目：
 *      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.
 *Example:
 *      Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
 *      Output: 7 -> 0 -> 8
 *      Explanation: 342 + 465 = 807.
 */
public class AddTwoNumbers_1008 {
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode temp1 = l1;
        ListNode temp2 = l2;
        ListNode result = null;
        ListNode current = null;
        int carray = 0;

        while (temp1 != null || temp2 != null || carray != 0) {
            //是否有进位
            int sum = carray;

            //相加
            sum += temp1 != null ? temp1.val : 0;
            sum += temp2 != null ? temp2.val : 0;

            carray = sum / 10;

            if (result == null) {
                result = new ListNode(sum % 10);
                current = result;
            }
            else {
                current.next = new ListNode(sum % 10);
                current = current.next;
            }
            temp1 = temp1 != null ? temp1.next : null;
            temp2 = temp2 != null ? temp2.next : null;
        }
        return result;
    }

    public static void main(String[] args) {
        ListNode node1 = new ListNode(2);
        ListNode node2 = new ListNode(4);
        ListNode node3 = new ListNode(3);
        node1.next = node2;
        node2.next = node3;

        ListNode node4 = new ListNode(5);
        ListNode node5 = new ListNode(6);
        ListNode node6 = new ListNode(4);
        node4.next = node5;
        node5.next = node6;

        AddTwoNumbers_1008 test = new AddTwoNumbers_1008();
        ListNode result = null;
        result = test.addTwoNumbers(node1, node4);
        while (result != null){
            System.out.print(result.val+" ");
            result = result.next;
        }
    }
}

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