This project forked from hcsp/discount-strategy-pattern
Java basic practice for beginners: polymorphism
请完成PriceCalculator中的挑战，使用策略模式进行重构，使业务与打折策略分离。
注：重构指的是在不改变原先代码功能的前提下，将原先的代码变得更精炼、可维护性更强。
在提交Pull Request之前，你应当在本地确保所有代码已经编译通过，并且通过了测试(mvn clean test)
注意！我们只允许你修改以下文件，对其他文件的修改会被拒绝：
完成题目有困难？不妨来看看写代码啦的相应课程吧！
回到写代码啦的题目，继续挑战！
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