Reading and writing a text file in ascending order. ( Small/annoying error- nearly completed)

Question

    Collections.sort(orderedStudents, new Comparator<Student>() {
        public int compare(Student s1, Student s2) {
            return s2.getAggregate().compareTo(s1.getAggregate());
        }
    });

This is the method i used.

Answer 1

The problem is the getAggregate method:

public Double getAggregate(){
    double d = 0;
    double aggregatescore = d/marks.size();
    return aggregatescore;
}

Since d is set to be zero, this method will return always 0, so the Collections.sort(...) method will do nothing