using System;

using System.Collections;



public class Director

{

    public void Construct( Builder builder )

    {

        builder.BuildWall();

        builder.BuildRoom();

        builder.BuildDoor();

    }

}



public abstract class Builder

{

    public abstract void BuildWall();

    public abstract void BuildRoom();

    public abstract void BuildDoor();

    public abstract GameScene GetResult();

}



public class GameBuilder : Builder

{

    private GameScene g;



    public override void BuildWall()

    {

        g = new GameScene();

        g.Add( "Wall" );

    }

    public override void BuildRoom()

    {

        g.Add( "Room" );

    }

    public override void BuildDoor()

    {

        g.Add( "Door" );

    }

    public override GameScene GetResult()

    {

        return g;

    }

}



public class GameScene

{

    ArrayList parts = new ArrayList();

    public void Add( string part )

    {

        parts.Add( part );

    }

    public void Display()

    {

        Console.WriteLine( " GameScene Parts：" );

        foreach( string part in parts )

            Console.WriteLine( part );

    }

}