Remove Duplicates from Sorted List

Given a sorted linked list, delete all duplicates such that each element appear only once.

public class Solution {
    public ListNode deleteDuplicates(ListNode head) {
        ListNode cur =head;
        while(cur!=null&&cur.next!=null){
            if(cur.val==cur.next.val){
                cur.next = cur.next.next;
            }
            else{
                cur = cur.next;
            }
        }
        return head;
    }
}