一个Adapter模式的小例子

画圆和长方形的方法是Area()，目标方法为GetArea(),所以要适配一下。

//目标接口：

interface ITarget

{

void getArea();

}

//抽象图形

public abstract class Shape

{

public abstract void Area();

}

//画圆

namespace Adapter

{

public class Circle : Shape

{

private double r;

public double R

{

get { return r; }

set { r = value; }

}

public Circle(double r)

{

this.R = r;

}

public override void Area()

{

Console.WriteLine("圆面积为{0}", 3.14 * R * R);

}

}

}

//画长方形

public class Rectangle : Shape

{

private double a, b;

public double B

{

get { return b; }

set { b = value; }

}

public double A

{

get { return a; }

set { a = value; }

}

public Rectangle(double a,double b)

{

this.A = a;

this.B = b;

}

public override void Area()

{

Console.WriteLine("长方形面积为{0}", A*B);

}

}

//类适配器

class AdapterDevice:ITarget

{

Shape _shape;

public AdapterDevice(Shape shape)

{

this._shape = shape;

}

public void getArea()

{

_shape.Area();

}

}

//客户端

class Program

{

static void Main(string[] args)

{

ITarget adapter1 = new AdapterDevice(new Circle(2));

ITarget adapter2 = new AdapterDevice(new Rectangle(2,4));

adapter1.getArea();

adapter2.getArea();

}

}