Object desing problem for simple school application
- by Aragornx
I want to create simple school application that provides grades,notes,presence,etc. for students,teachers and parents. I'm trying to design objects for this problem and I'm little bit confused - because I'm not very experienced in class designing. Some of my present objects are :
class PersonalData() {
private String name;
private String surename;
private Calendar dateOfBirth;
[...]
}
class Person {
private PersonalData personalData;
}
class User extends Person {
private String login;
private char[] password;
}
class Student extends Person {
private ArrayList<Counselor> counselors = new ArrayList<>();
}
class Counselor extends Person {
private ArrayList<Student> children = new ArrayList<>();
}
class Teacher extends Person {
private ArrayList<ChoolClass> schoolClasses = new ArrayList<>();
private ArrayList<Subject> subjects = new ArrayList<>();
}
This is of course a general idea. But I'm sure it's not the best way. For example I want that one person could be a Teacher and also a Parent(Counselor) and present approach makes me to have two Person objects. I want that user after successful logging in get all roles that it has (Student or Teacher or (Teacher & Parent) ). I think I should make and use some interfaces but I'm not sure how to do this right. Maybe like this:
interface Role {
}
interface TeacherRole implements Role {
void addGrade( Student student, Grade grade, [...] );
}
class Teacher implements TeacherRole {
private Person person;
[...]
}
class User extends Person{
ArrayList<Role> roles = new ArrayList<>();
}
Please if anyone could help me to make this right or maybe just point me to some literature/article that covers practical objects design.
