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

In Java 8 you can sort the list with a one-liner using Lambda expressions and Comparator.comparing:

Collections.sort(studentList, Comparator.comparing(s -> s.getBirthday()));

Alternatively you can use the method reference:

Collections.sort(studentList, Comparator.comparing(Student::getBirthday));