Java Интерфейс Collection

class Collective {
 
    int id;
    String name;
    int age;
    String teaching;
    int classNumber;
 
    public Collective(int teacherID, String teacherName, int teacherAge, String teaching) {
        this.id = teacherID;
        this.name = teacherName;
        this.age = teacherAge;
        this.teaching = teaching;
    }
 
    public Collective(int studentID, String studentName, int studentAge, int classNumber) {
        this.id = studentID;
        this.name = studentName;
        this.age = studentAge;
        this.classNumber = classNumber;
    }
}
 
class SchoolTeam {
 
    public static void main(String[] args) {
        ArrayList<Collective> team = new ArrayList<>();
        team.add(new Collective(1, "Сергеев", 42, "география"));
        team.add(new Collective(2, "Юлианова", 12, 7));
        team.add(new Collective(3, "Борисов", 40, "математика"));
        team.add(new Collective(4, "Грачёв", 13, 8));
        team.add(new Collective(5, "Семёнова", 49, "литература"));
        team.add(new Collective(6, "Осипов", 14, 9));
        team.add(new Collective(7, "Данилова", 29, "физика"));
        team.add(new Collective(9, "Архипова", 11, 6));
        Collections.sort(team, (Collective team1, Collective team2) -> team1.name.compareTo(team2.name));
        team.stream().forEach((temp) -> {
            System.out.println(temp.name);
        });
        int max = team.get(0).age;
        String name = null;
        for (Collective temp : team) {
            if (max < temp.age) {
                max = temp.age;
                name = temp.name;
            }
        }
        System.out.println("Больше всего лет " + name + " - " + max);
    }
}