Example

School.java

public class School {
    private final String _name;
    private final Stream<Student> _students;

    public School(String schoolName, Stream<Student> students){
        _name = schoolName;
        _students = students;
    }
  
    public String get_name() {
        return _name;
    }

    public Stream<Student> get_students() {
        return _students;
    }

    public void set_address(String test_address) {
        // set imaginary address
    }
}

Student.java

public class Student {
    private final String _name;
    private final int _year;
    private final int _height;

    public Student(String name, int year, int height) {
        _name = name;
        _year = year;
        _height = height;
    }

    public int get_year() {
        return _year;
    }

    public String get_name() {
        return _name;
    }

    public int get_height() {
        return _height;
    }
}