Example of inheritance and polymorphism in Dart

main.dart

void main() {
  Car nissan = Car();
  ElectricCar opel = ElectricCar();
  FlyingCar vw = FlyingCar();
  print(nissan.numberOfSeats);
  nissan.drive();
  print(opel.numberOfSeats);
  opel.drive();
  vw.drive();
  
}

class Car {
  int numberOfSeats = 5; //properties
  void drive() {
    print('It\'s driving with LPG');
  }
}

class ElectricCar extends Car {
  @override //it override drive method from car class
  void drive() {
    print('It\'s driving with electricity');
  }
}

class FlyingCar extends ElectricCar {
  @override
  void drive() {
    super.drive(); //parent method
    print('Wow! It\'s flying!');
  }
}