C#面向对象设计模式纵横谈——12. Flyweight享元模式

主讲：李建忠

来源：http://www.microsoft.com/china/msdn/events/webcasts/shared/webcast/consyscourse/CsharpOOD.aspx

 

 

Flyweightclass Font    //(12 bytes+8 bytes=20 bytes)*n

{

    string fontName;    //4 bytes

    int size;    //4 bytes

    Color color;    //4 bytes



    //重写Font.Equals

}



class Charactor

{

    char c;    //16bit,2 bytes 比引用（指针4 bytes）的开销小，没有必要对char进行共享

    Font f;    //开销大

    private static Hashtable fontTable;



    Font CFont

    {

        get

        {

	    return f;

        }

	set

	{

	    if(fontTable.Keys.Exist(f))

	    {

	        this.f=fontTable.Keys(f);

	    }

	    else

	    {

	        fontTable.Keys.Add(value);

	        this.f=value;

	    }

	}

    }

}



class System

{

    public static void Main()

    {

        ArrayList list=new ArrayList(1000000);



	Font f1=new Font("宋体",5,Color.Red);

	Font f2=new Font("宋体",5,Color.Red);



	Charactor c=new Charactor();

        c.c='a';

	c.CFont=f1;



	Charactor c=new Charactor();

        c.c='a';

	c.CFont=f2;



    }

}