python 工廠類設計模式
例：麥當勞自助點餐臺一類的點餐系統。在觸控顯示屏上，有三類可以選擇的餐品：漢堡，小食，飲料。當我們選擇好自己的食物，支付完成，訂單就生成了。
1.漢堡以2種為例
class burger(object):
name = ""
price = 0.0
def getprice(self):
return self.price
def setprice(self, price):
self.price = price
def getname(self):
return self.name
class cheeseburger(burger):
def __init__(self):
self.name = "cheese burger"
self.price = 10.0
class spicychickenburger(burger):
def __init__(self):
self.name = "spicy chicken burger"
self.price = 15.0
class snack(object):
name = ""
price = 0.0
type = 'snack'
def getprice(self):
return self.price
def setprice(self, price):
self.pirce = price
def getname(self):
return self.name
class chips(snack):
def __init__(self):
self.name = 'chips'
self.price = 6.0
class chickenwings(snack):
def __init__(self):
self.name = "chicken wings"
self.price = 12.0
class beverage(object):
name = ""
price = 0.0
type = "beverage"
def getprice(self):
return self.price
def setprice(self, price):
self.price = price
def getname(self):
return self.name
class coke(beverage):
def __init__(self):
self.name = 'coke'
self.price = 4.0
class milk(beverage):
def __init__(self):
self.name = 'milk'
self.price = 5.0
class foodfactory(object):
type = ""
def createfood(self, foodclass):
print(self. type, "factory produce a instance")
foodins = foodclass()
return foodins
class burge***ctory(foodfactory):
def __init__(self):
self.type = "burger"
class snackfactory(foodfactory):
def __init__(self):
self.type = "snack"
class beveragefactory(foodfactory):
def __init__(self):
self.type = "beverage"
if __name__ == '__main__':
burger_factory = burge***ctory()
snack_factory = snackfactory()
beverage_factory = beveragefactory()
cheese_burger = burger_factory.createfood(cheeseburger)
print(cheese_burger.getname(), cheese_burger.getprice())
chicken_wings = snack_factory.createfood(chickenwings)
print(chicken_wings.getname(), chicken_wings.getprice())
coke_drink = beverage_factory.createfood(coke)
print(coke_drink.getname(), coke_drink.getprice())
burger factory produce a instance
cheese burger 10.0
snack factory produce a instance
chicken wings 12.0
beverage factory produce a instance
coke 4.0
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