《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();