Delete Nodes From Linked List Present in Array

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public ListNode modifiedList(int[] nums, ListNode head) {
        HashSet<Integer> set = new HashSet<>();
        for(int num : nums) {
            set.add(num);
        }

        ListNode dummy = new ListNode(-1);
        dummy.next = head;
        ListNode temp = dummy;

        while(temp.next!=null) {
            if(set.contains(temp.next.val)) {
                temp.next = temp.next.next;
            }
            else temp = temp.next;
        }
        return dummy.next;
    }
}