Vehicle Example

main.dart

class Vehicle {
  //Defaults to car
  String get type => "car";
  void drive() {
    print("You're driving a $type.");
  }
}

class Tractor implements Vehicle {
  @override
  String get type => 'tractor';

  @override
  void drive() {
    print("You're driving a $type.");
  }
}

void main() {
  final car = Vehicle();
  car.drive();

  final tractor = Tractor();
  tractor.drive();
}