Flutter勉強会3回目の資料(抽象化クラス)

flutter_study_3rd_2.dart

void main() {
  // error
  Animal animal0 = Animal();
  
  Animal animal1 = Mike();
  print(animal1.breed);
  animal1.bark();
  
  Animal animal2 = Shiba();
  print(animal2.breed);
  animal2.bark();
}

abstract class Animal {
  Animal();
  
  // field
  String breed;
  
  // method
  void bark();
}

class Mike implements Animal {
  
  String breed = 'Cat';
  
  void bark() {
    print('meow');
  }
}

class Shiba implements Animal {
  
  get breed => 'Dog';
  set breed(String newValue) => breed = newValue;
  
  void bark() {
    print('bow-wow');
  }
}