Factory Methods

最新推荐文章于 2024-02-23 11:18:34 发布

lidanny

最新推荐文章于 2024-02-23 11:18:34 发布

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分类专栏：设计模式文章标签： methods class

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本文介绍了一种使用工厂模式创建迷宫游戏的方法。通过定义一系列的工厂方法，不同的迷宫游戏可以创建出不同类型的房间、门和墙等组件。具体实现包括基本的MazeGame类及扩展此类的BombMazeGame和EnhantedMazeGame。

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package designPattern;

//creator
class MazeGame{
   public Maze CreateMaze()
   {
       Maze aMaze = MakeMaze();

       Room r1 = MakeRoom(1);
       Room r2 = MakeRoom(2);

       Door theDoor = MakeDoor(r1, r2);

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

       r1.SetSide(North, MakeWall());
       r1.SetSide(East, theDoor);
       r1.SetSide(South, MakeWall());
       r1.SetSide(West, MakeWall());

       r2.SetSide(North, MakeWall());
       r2.SetSide(East, MakeWall());
       r2.SetSide(South, MakeWall());
       r2.SetSide(West, theDoor);
   }

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

//concrete creator
class BombMazeGame extends MazeGame{
   public Wall MakeWall()
   {
       //concrete product
       return new BombWall();
   }
   public Room MakeRoom(int n)
   {
       return new BombRoom(n);
   }
}

//concrete creator
class EnhantedMazeGame extends MazeGame{
   public Wall MakeRoom(int n)
   {
       return new EnhantedRoom(n, CastSpell());
   }
   public Door MakeDoor(Room r1, Room r2){
       return new DoorNeedingSpell(r1, r2);
   }
   protected Spell CastSpell();
}

public class FactoryMethods {

}