I have input of Ids

List<Integer> idList = List.of(100, 101, 102, 103, 104);

from DB i got list of Objects

@Getter
@Builder
public class CustomObject {
   private int id;
}

List<CustomObject> fromDB = List.of(
    CustomObject.builder().id(102).build(), 
    CustomObject.builder().id(104).build()
);

I want to see difference between input IDs with response from DB CustomObject list
If response from DB does not contains id from input i want to see this difference

List<Integer> listOfID = fromDB.stream().map(CustomObject::getId).toList();

String list = idList.stream().filter(element -> !listOfID.contains(element)).map(String::valueOf).collect(Collectors.joining(", "));
System.out.println("RESULT: " + list);

RESULT: 100, 101, 103

I don’t have a big experience on Stream API is it possible to simplify my implementation?