(Python3 代码实现)《大话设计模式》五：工厂方法模式

• 模式特点：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。这使得一个类的实例化延迟到其子类。
• 程序实例：基类雷锋类，派生出学生类和志愿者类，由这两种子类完成“学雷锋”工作。子类的创建由雷锋工厂的对应的子类完成。
• 代码特点：无

class LeiFeng:
    def Sweep(self):
        print("LeiFeng sweep")


class Student(LeiFeng):
    def Sweep(self):
        print("Student sweep")


class Volenter(LeiFeng):
    def Sweep(self):
        print("Volenter sweep")


class LeiFengFactory:
    def CreateLeiFeng(self):
        temp = LeiFeng()
        return temp


class StudentFactory(LeiFengFactory):
    def CreateLeiFeng(self):
        temp = Student()
        return temp


class VolenterFactory(LeiFengFactory):
    def CreateLeiFeng(self):
        temp = Volenter()
        return temp


if __name__ == "__main__":
    sf = StudentFactory()
    s = sf.CreateLeiFeng()
    s.Sweep()
    sdf = VolenterFactory()
    sd = sdf.CreateLeiFeng()
    sd.Sweep()