ডার্ট অবজেক্ট ওরিয়েন্টেড প্রোগ্রামিং

class User {

  String name = "আরিফ";
  String land = "বাংলাদেশ";
}

void main() {

  User user = User();

  print(user.name);
  print(user.land);
}

class User {

  String name = "আরিফ";
  String land = "বাংলাদেশ";
}

void main() {

  User user = new User();

  print(user.name);
  print(user.land);
}

class Land {

  String land = "বাংলাদেশ";
}

class Arif extends Land {

  String name = "আরিফ";
}

void main() {

  Arif arif = Arif();

  print(arif.name);
  print(arif.land);
}

class PHP {

  static const String version = "8.2.3";
}

void main() {

  print(PHP.version);
}

abstract class User {

  String name;
  String land;

  User(this.name, this.land);
}

class Author extends User {

  Author(String name, String land)
    : super(name, land);
}

void main() {

  Author user = Author("আরিফ", "বাংলাদেশ");

  print(user.name);
  print(user.land);
}

abstract interface class User {

  void info();
}

class Author implements User {

  @override
  void info() {
    print("আরিফ - বাংলাদেশ");
  }
}

void main() {

  Author user = Author();

  user.info();
}

abstract interface class Name {

  String name();
}

abstract interface class Land {

  String land();
}

class Author implements Name, Land {

  @override
  String name() {
    return "আরিফ";
  }

  @override
  String land() {
    return "বাংলাদেশ";
  }
}

void main() {

  Author user = Author();

  print(user.name());
  print(user.land());
}

class User {

  static String name = "আরিফ";

  static String message() {
    return "হ্যালো বিশ্ব";
  }
}

void main() {

  print(User.name);
  print(User.message());
}

class User {

  final String name = "আরিফ";
}

void main() {

  User user = User();

  print(user.name);
}