设计模式二:抽象工厂模式
什么是抽象工厂模式
抽象工厂模式是工厂方法模式的一种泛化。当应用许多工厂方法时,将创建一系列对象的过程合并在一起会更合理,此时便引入了抽象工厂。
优点
1.让对象的创建更容易追踪
2.对象创建与使用解耦
3.提供优化内存占用和应用性能的潜力
4.通过改变激活的工厂方法动态地改变应用行为(例如应用切换风格)
实例代码
class MP3:
def __init__(self):
self.machine = 'MP3'
def __str__(self):
return self.machine
def play(self,play_file):
print('Use {} play the {} : {}'.format(self,play_file,play_file.getdata()))
class music:
def __str__(self):
return 'lalalalala.mp3'
def getdata(self):
return 'lalalalala'
class Listen_Factory:
def __init__(self):
print(self)
def __str__(self):
return '------Listen to the music ------'
def make_machine(self):
return MP3()
def play_file(self):
return music()
class MP4:
def __init__(self):
self.machine = 'MP4'
def __str__(self):
return self.machine
def play(self,play_file):
print('Use {} play the {} : {}'.format(self,play_file,play_file.getdata()))
class movie:
def __str__(self):
return 'dididididi.mp4'
def getdata(self):
return 'dididididi'
class Watch_Factory:
def __init__(self):
print(self)
def __str__(self):
return '------Watch a movie ------'
def make_machine(self):
return MP4()
def play_file(self):
return movie()
class Relax_Factory:
def __init__(self,choose):
self.machine = choose.make_machine()
self.play_file = choose.play_file()
def play(self):
self.machine.play(self.play_file)
def main():
print('Which one do you like?')
print('1. Listen to music')
print('2. Watch a movie')
opt = input('Select the number\n')
opt = int(opt)
choose = Listen_Factory if opt ==1 else Watch_Factory
relax = Relax_Factory(choose())
relax.play()
if __name__ == "__main__":
main()