Merge Nodes in Between Zeros

给一个linkedlist, 里面的数字由0分割, 求0之间的数字的和的list.

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public ListNode mergeNodes(ListNode head) {
        ListNode resDummy = new ListNode();
        ListNode res = resDummy;
        int tmp = 0;
        while(head != null && head.next != null){
            if(head.next.val == 0){
                res.next = new ListNode(tmp);
                res = res.next;
                tmp = 0;
            }else
            {
                tmp += head.next.val;
            }
            head = head.next;
        }
        return resDummy.next;
    }
}