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23 lines
872 B
23 lines
872 B
8 months ago
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# 装饰器模式允许我们在不修改原有类的基础上，动态地添加额外的功能。
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# 就增加功能来说，装饰器模式比生成子类更为灵活。
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# 餐吧的顾客可以选择为他们的咖啡添加额外的调料。
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class Beverage:
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def __init__(self, description):
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self.description = description
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self.price = 0.0
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def cost(self):
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return self.price
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class CondimentDecorator(Beverage): # 进行装饰
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def __init__(self, beverage, description, price_increase):
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self.beverage = beverage
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self.description = f"{beverage.description}, {description}"
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self.price_increase = price_increase
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def cost(self):
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return self.beverage.cost() + self.price_increase
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# 使用装饰器模式
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coffee = Beverage("Espresso")
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coffee_with_chocolate = CondimentDecorator(coffee, "Chocolate", 0.50)
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