public abstract class Road { }
public abstract class Building { }public class ClassicRoad : Road { }
public class ClassicBuilding : Building { }public class ModernRoad : Road { }
public class ModernBuilding : Building { }public abstract class FacilitiesFactory
{
    public abstract Road CreateRoad();
    public abstract Building CreateBuilding();
}public class ClassicFacilitiesFactory : FacilitiesFactory
{
    public override Road CreateRoad()
    {
        return new ClassicRoad();
    }
    public override Building CreateBuilding()
    {
        return new ClassicBuilding();
    }
}public class ModernFacilitiesFactory : FacilitiesFactory
{
    public override Road CreateRoad()
    {
        return new ModernRoad();
    }public override Building CreateBuilding()
    {
        return new ModernBuilding();
    }
}class GameManager
{
    FacilitiesFactory facilitiesFactory;
    Road road;
    Building building;public GameManager(FacilitiesFactory facilitiesFactory)
    {
        this.facilitiesFactory = facilitiesFactory;
    }public void BuildGameFacilities()
    {
        road = facilitiesFactory.CreateRoad();
        building = facilitiesFactory.CreateBuilding();
    }public void Play()
    {
        road.AAA();
        building.BBB(road);
    }
}class App
{
    public static void Main()
    {
        GameManager manager = new GameManager(new ClassicFacilitiesFactory());
        manager.BuildGameFacilities();
        manager.Play();
    }
}