Remove Duplicates from Sorted List.JAVA

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