Weird Task with Class

import java.io.IOException;
import java.util.*;
import java.util.stream.Collectors;

public class Main {
    static class Person {
        String name;
        int age;
        double grade;

        public Person(String name, int age, double grade) {
            this.name = name;
            this.age = age;
            this.grade = grade;
        }
    }

    public static void main(String[] args) throws IOException {
        List<Person> people = new ArrayList<>();

        Person person1 = new Person("Ivan", 20, 4.5);
        Person person2 = new Person("Pesho", 20, 5.64);
        Person person3 = new Person("Dragan", 20, 3.27);

        people.add(person1);
        people.add(person2);
        people.add(person3);

        people = people
                .stream()
                .sorted((p1, p2) -> {
                    int ageComparison = Integer.compare(p1.age, p2.age);

                    if (ageComparison != 0) {
                        return ageComparison;
                    } else {
                        return Double.compare(p2.grade, p1.grade);
                    }
                }).collect(Collectors.toList());

        for (Person currentPerson : people) {
            System.out.printf("Name: %s | Age: %d | Grade: %f%n", currentPerson.name, currentPerson.age, currentPerson.grade);
        }
    }
}