java how to sort custom objects in descending orde

ArrayList<StudentInformation> infos = new ArrayList<StudentInformation>();
// fill array
Collections.sort(infos, (s1, s2) ->
    Integer.compare(s2.getBirthYear(), s1.getBirthYear()));

ArrayList<StudentInformation> infos = new ArrayList<StudentInformation>();
// fill array
Collections.sort(infos, 
    Comparator.comparingInt(StudentInformation::getBirthYear).reversed());