（LinkedList） Remove Linked List Elements

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

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
public class Solution {
    public ListNode removeElements(ListNode head, int val) {
             while(head!=null && head.val==val)
                head=head.next;
              if(head==null) 
                return head;
              ListNode cur=head;
              while(cur!=null && cur.next!=null){
                  if(cur.next.val==val){
                       cur.next=cur.next.next;
                  }
                  else
                    cur=cur.next;
              }
           return head;
  }
     }