inheritance-problem 

readme.md

inheritance-problem 

Created with <3 with dartpad.dev.

main.dart

// 1. User는 Name(String)을 가진다.
// 2. Teacher는 id(int)를 가진다.
// 3. Teacher는 User이다.
// 4. Student는 gpa(String or double)학점을 가진다.
// 5. Student는 User이다.
// 6. Member는 email을 가진다.
// 7. Member는 Teacher와 Student를 가진다.

abstract class User{
  late String name;
}

class Teacher extends User{
  Teacher({required this.id, required String name}){
    super.name = name;
  }
  
  final int id;
}

class Student<T> extends User{
  T? gpa;
  Student({required String name, required this.gpa}) {
    super.name = name;
  }
}

class Member<T extends User>{
  Member({
    required this.email,
    required this.user,
  });
  
  T user;
  String email;
}


// Q2. -- use inheritance with generic ---
void main() {
  
    Member<Teacher> member1 = Member<Teacher>(
      email: 'a@a.com',
      user: Teacher(id: 1, name: '선생1'),
    );
    Member<Student> member2 = Member<Student>(
      email: 'b@b.com',
      user: Student(gpa: 'B', name: '학생1'),
    );
  
    Member<Student> member3 = Member<Student>(
      email: 'c@c.com',
      user: Student(gpa: 80, name: '학생2'),
    );


    print('${member1.user.name}, ${member1.user.id}');
    print('${member2.user.name}, ${member2.user.gpa ?? 'GD'}');
    print('${member3.user.name}, ${member3.user.gpa ?? 'GD'}');
}