Dart中inheritance的正确方式

Question

I have two parent classes:

class Animal {
  final String name;
  final Home home;

  Animal(this.name, this.home);
}

class Home {
  final String location;

  Home(this.location);
}

And their corresponding child classes:

class Human extends Animal {
  Human(String name, Home home) : super(name, home);

  getDetails() {
    print("$name\n");
    print("${home.getLocation()}\n");
  }
}

class House extends Home {
  House(String location) : super(location);

  String getLocation() {
    return "North side of $location";
  }
}

As you can see the child class of Home , House contains a method getLocation . Also the child class of Animal , Human has a method getDetails which needs to call the getLocation method. But it says The method 'getLocation' isn't defined for the type 'Home'.

This is just an example made up by me trying to understand a real usecase of entity-model where model is a child of entity which contains additional methods like toJson / fromJson . I am unable to call second child class's(in this case House) toJson(like the getLocation method in this case) method from the first child class (in this case Human).

Answer 1

I have two parent classes:

class Animal {
  final String name;
  final Home home;

  Animal(this.name, this.home);
}

class Home {
  final String location;

  Home(this.location);
}

And their corresponding child classes:

class Human extends Animal {
  Human(String name, Home home) : super(name, home);

  getDetails() {
    print("$name\n");
    print("${home.getLocation()}\n");
  }
}

class House extends Home {
  House(String location) : super(location);

  String getLocation() {
    return "North side of $location";
  }
}

As you can see the child class of Home , House contains a method getLocation . Also the child class of Animal , Human has a method getDetails which needs to call the getLocation method. But it says The method 'getLocation' isn't defined for the type 'Home'.

This is just an example made up by me trying to understand a real usecase of entity-model where model is a child of entity which contains additional methods like toJson / fromJson . I am unable to call second child class's(in this case House) toJson(like the getLocation method in this case) method from the first child class (in this case Human).