rapper一姐潮水

尹旭收回有些失礼的目光，笑道：说起来入夜之后来叨扰还真有些不好意思。故而两人都越王尹旭可谓是敌意颇多，越国和东瓯、闽越之间的矛盾已经存在了，摩擦与冲突是必然的。老妇摇头道：汪滶平庸，亡夫只求其一生平安。当然了任何事情都是有两面性的，为了起到震慑的作用，所以不得不快刀斩乱麻。In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.