Weird Task

import java.io.IOException;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws IOException {
        Scanner scanner = new Scanner(System.in);

        Map<String, HashMap<Integer, Double>> test = new LinkedHashMap<>();

        String name = "Ivan";
        int age = 20;
        double grade = 4.5;
        test.put(name, new HashMap<>());
        test.get(name).put(age, grade);

        name = "Pesho";
        age = 20;
        grade = 5.64;
        test.put(name, new HashMap<>());
        test.get(name).put(age, grade);

        name = "Dragan";
        age = 20;
        grade = 3.27;
        test.put(name, new HashMap<>());
        test.get(name).put(age, grade);

        // Сортиране по възраст, ако са равни да се сортират по оценка ?
        test.entrySet().stream()
                .sorted((person1, person2) -> {
                    Map<Integer, Double> person1AgeGrade = person1.getValue();
                    int person1Age = (int) person1AgeGrade.keySet().toArray()[0];
                    Double person1Grade = (Double) person1AgeGrade.values().toArray()[0];

                    Map<Integer, Double> person2AgeGrade = person2.getValue();
                    int person2Age = (int) person2AgeGrade.keySet().toArray()[0];
                    Double person2Grade = (Double) person2AgeGrade.values().toArray()[0];

                    int ageComparisonResult = Integer.compare(person1Age, person2Age); // ascending
                    if (ageComparisonResult != 0) {
                        return ageComparisonResult;
                    } else { //if equal
                        return person2Grade.compareTo(person1Grade); //descending
                    }
                }).forEach(sortedPerson -> {
            String sortedPersonName = sortedPerson.getKey();

            Map<Integer, Double> sortedPersonAgeGrade = sortedPerson.getValue();
            int sortedPersonAge = (int) sortedPersonAgeGrade.keySet().toArray()[0];
            Double sortedPersonGrade = (Double) sortedPersonAgeGrade.values().toArray()[0];

            System.out.printf("Name: %s | Age: %d | Grade: %f%n", sortedPersonName, sortedPersonAge, sortedPersonGrade);
        });
    }
}