删除链表中的元素

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
public class Solution {
    /**
     * @param head a ListNode
     * @param val an integer
     * @return a ListNode
     */
    public ListNode removeElements(ListNode head, int val) {
        // Write your code here
        ListNode res = head;
        if(head==null) return null;
        while(head.next!=null){
            if(head.next.val==val){
                if(head.next.next!=null){
                    head.next = head.next.next;
                }else{
                    head.next=null;
                    break;
                }
            }else{
                head = head.next;
            }
        }
       if(head.val==val) return head.next;
       return res;
    }
   
}