How to sort an attribute of an object using Collections

Question

Good day!

I have an object student with the following attributes:

class Student
    String name
    Date birthday

I used arrayList

Answer 1

You need to write a custom comparator.

Something like:

Collections.sort(studentList, new Comparator() {

    public int compare(Strudent a, Strudent b) {
        return a.birthday.compareTo(b.birthday);
    }

});