203. Remove Linked List Elements java solutions

Remove all elements from a linked list of integers that have value val.

Example
Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6
Return: 1 --> 2 --> 3 --> 4 --> 5

Credits:
Special thanks to @mithmatt for adding this problem and creating all test cases.

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 1 /**
 2  * Definition for singly-linked list.
 3  * public class ListNode {
 4  *     int val;
 5  *     ListNode next;
 6  *     ListNode(int x) { val = x; }
 7  * }
 8  */
 9 public class Solution {
10     public ListNode removeElements(ListNode head, int val) {
11         if(head == null) return head;
12         ListNode ans = new ListNode(-1);
13         ListNode tmp = new ListNode(-1);
14         ans.next = tmp;
15         ListNode cur = head;
16         while(cur != null){
17             if(cur.val != val) {
18                 tmp.next = cur;
19                 tmp = tmp.next;
20             }
21             cur = cur.next;
22         }
23         tmp.next = null;
24         return ans.next.next;
25     }
26 }