《大话设计模式》读书笔记6 工厂方法模式

工厂方法（Factory Method）模式：定义一个用于创建对象的接口，让子类决定实例化哪一个类，工厂方法使一个类的实例化延迟到其子类。

工厂方法模式结构图：

工厂方法模式实现代码：

class Leifeng{public void Sweep(){Console.WriteLine("扫地");}public void Wash(){Console.WriteLine("洗衣");}public void BuyRice(){Console.WriteLine("买米");}}class Undergraduate:Leifeng{}class Volunteer:Leifeng{}interface IFactory{Leifeng CreateLeiFeng();}class UndergraduateFactory:IFactory{public Leifeng CreateLeiFeng(){return new Undergraduate();}}class VolunteerFactory:IFactory{public Leifeng CreateLeiFeng(){return new Volunteer();}}IFactory factory=new UndergraduateFactory();Leifeng student=factory.CreateLeiFeng();student.BuyRice();student.Sweep();student.Wash();