public class Students {
    private String name;
    private String surname;
    private int years;

    public Students(String name, String surname, int years) {
        this.name = name;
        this.surname = surname;
        this.years = years;
    }

    public String getName() {
        return name;
    }

    public String getSurname() {
        return surname;
    }

    public int getYears() {
        return years;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Students students = (Students) o;
        return years == students.years &&
                Objects.equals(name, students.name) &&
                Objects.equals(surname, students.surname);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, surname, years);
    }

    @Override
    public String toString() {
        return "Students{" +
                "name='" + name + '\'' +
                ", surname='" + surname + '\'' +
                ", years=" + years +
                '}';
    }
}

class Numbers {


    public Numbers() {

    }


    public double sredniaOcen() {
        int sum = 0;
        for (int i = 0; i < arrayList.size(); i++) {
            sum += arrayList.get(i);
        }
        double avg = sum / arrayList.size();
        return avg;
    }

    ArrayList<Integer> arrayList = new ArrayList<Integer>();

    public boolean addToArrayList(int number) {

        return arrayList.add(number);

    }

}

class App10 {
    public static void main(String[] args) {
        Students students1 = new Students("aaa", "kowalski", 1992);
        Students students2 = new Students("Kasia", "alski", 1992);
        Students students3 = new Students("Basia", "ski", 1992);
        Students students4 = new Students("aaaTOmasz", "kow", 1992);


        Numbers numbers1 = new Numbers();
        numbers1.addToArrayList(1);
        numbers1.addToArrayList(2);
        numbers1.addToArrayList(5);
        numbers1.addToArrayList(6);

        Numbers numbers2 = new Numbers();
        numbers2.addToArrayList(5);
        numbers2.addToArrayList(5);
        numbers2.addToArrayList(5);
        numbers2.addToArrayList(5);


        Numbers numbers3 = new Numbers();
        numbers3.addToArrayList(3);
        numbers3.addToArrayList(4);
        numbers3.addToArrayList(6);
        numbers3.addToArrayList(1);

        Numbers numbers4 = new Numbers();
        numbers4.addToArrayList(6);
        numbers4.addToArrayList(6);
        numbers4.addToArrayList(1);
        numbers4.addToArrayList(6);
        numbers4.addToArrayList(2);
        numbers4.addToArrayList(6);
        numbers4.addToArrayList(1);


        List<Integer> oceny = new LinkedList<Integer>();

        Map<Students, Numbers> studentsNumbersMap = new HashMap<Students, Numbers>();

        studentsNumbersMap.put(students1, numbers1);
        studentsNumbersMap.put(students2, numbers2);
        studentsNumbersMap.put(students3, numbers3);
        studentsNumbersMap.put(students4, numbers4);

        for (Map.Entry<Students, Numbers> entry : studentsNumbersMap.entrySet()) {
            System.out.println("Uczen nazwya sie : " + entry.getKey().toString() +
                    " a jego średnia to : " + entry.getValue().sredniaOcen());

        }

    }
}