Insert Node in Sorted Linked List

题目：

Insert a node in a sorted linked list.

Given list = 1->4->6->8 and val = 5.
Return 1->4->5->6->8.

分析：

注意一下添加在最后的时候怎么处理

解法：

public class Solution {
    /**
     * @param head: The head of linked list.
     * @param val: an integer
     * @return: The head of new linked list
     */
    public ListNode insertNode(ListNode head, int val) { 
        // Write your code here
        ListNode dummy = new ListNode(-1);
        dummy.next = head;
        ListNode curr = dummy;
        while (curr != null) {
            if (curr.next == null || curr.next.val > val) {
                ListNode temp = new ListNode(val);
                temp.next = curr.next;
                curr.next = temp;
                break;
            }
            curr = curr.next;
        }
        return dummy.next;
    }  
}