Фабричный метод (Factory Method)

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Код

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MazeCommon;

namespace MazeGameFactoryMethod
{
    class MazeGame
    {
        public Maze CreateMaze()
        {
            Maze aMaze = MakeMaze();
            Room r1 = MakeRoom(1);
            Room r2 = MakeRoom(2);
            Door d = MakeDoor(r1, r2);

            aMaze.AddRoom(r1);
            aMaze.AddRoom(r2);

            r1.SetSide(Direction.North, MakeWall());
            r1.SetSide(Direction.East, d);
            r1.SetSide(Direction.South, MakeWall());
            r1.SetSide(Direction.West, MakeWall());
            r2.SetSide(Direction.North, MakeWall());
            r2.SetSide(Direction.East, MakeWall());
            r2.SetSide(Direction.South, MakeWall());
            r2.SetSide(Direction.West, d);

            return aMaze;
        }
        public virtual Maze MakeMaze()
	{ 
            return new Maze(); 
        }
        public virtual Wall MakeWall()
	{ 
            return new Wall(); 
        }
        public virtual Room MakeRoom(int n)
        { 
            return new Room(n); 
        }
        public virtual Door MakeDoor(Room r1, Room r2)
        { 
            return new Door(r1, r2); 
        }
    };

    class ProgramFactoryMethod
    {
        static void Main(string[] args)
        {
            Console.WriteLine("FactoryMethod");
            var game = new MazeGame();
            Maze m = game.CreateMaze();
        }
    }
}