如何在方法中使用作为属性类对象并使用它。飞镖

Question

class Hotel {
  static final Map<String, List<String>> mapInformation = {
    'Americana Hotel': [
      '4.3*', 
      '\$4000 / Night', 
    ],
  };

  String getPrice(String favouriteElementsName) {
    return mapInformation[favouriteElementsName]?.elementAt(1) ??
        'It may need fixes';
  }

  String getRating(String favouriteElementsName) {
    return mapInformation[favouriteElementsName]?.elementAt(0) ??
        'It may need fixes';
  }
}

class Home {
  static final Map<String, List<String>> mapInformation = {
    'Beachside Resort': [
      '2.2*', 
      '\$2200 / Night', 
    ],
  };

  String getPrice(String favouriteElementsName) {
    return mapInformation[favouriteElementsName]?.elementAt(1) ??
        'It may need fixes';
  }

  String getRating(String favouriteElementsName) {
    return mapInformation[favouriteElementsName]?.elementAt(0) ??
        'It may need fixes';
  }
}

class Favourite {
  final LinkedHashMap<String, dynamic> favouriteElementsInLinkedHashMap =
      LinkedHashMap();

  void changePrice(String favouriteElementKey, Object obj) {
    obj.mapInformation[favouriteElementKey]?[1] = '\$5000 / Night';
    var str1 = obj.getPrice(favouriteElementKey);
    var str2 = obj.getRating(favouriteElementKey);
  }

  void main() {
    var fav = Favourite();
    favouriteElementsInLinkedHashMap['Americana Hotel'] = Hotel;
    favouriteElementsInLinkedHashMap['Beachside Resort'] = Home;

    for (var mapKey in favouriteElementsInLinkedHashMap.keys) {
      fav.changePrice(
          mapKey, favouriteElementsInLinkedHashMap[mapKey]);
    }
  }
}

有方法changePrice，当我使用mapInformation时它给我一个错误，有什么办法，我如何在方法changePrice中使用mapInformation，getPrice，getRating。有很多类别，如酒店和家庭。所以我不能在方法changePrice中使用if,else。

Answer 1

创建一个定义这些方法的抽象类：

abstract class Accommodation {
  String getPrice(String favouriteElementsName);
  String getRating(String favouriteElementsName);
}

现在

Hotel

和

Home

都应该扩展该抽象类，并用

@override

注释重写方法：

class Hotel extends Accommodation {
  @override
  String getPrice(String favouriteElementsName) {
    // ...
  }

  // Do the same for other overriding methods
}

class Home extends Accommodation {
  // Do the same as Hotel
}

更改

obj

参数的类型：

void changePrice(String favouriteElementKey, Accommodation obj) {
  // ...
}