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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.　　老一代运动员退役，新一代以更开放和包容的姿态站上舞台，在冰面上，两代运动员完成了体育精神的接力和传承，而陈冕也已经做好准备，代表中国站上2022年北京冬奥会的赛场。System.out.println ("this is original method! ");你说送了谁，我们去找他买，或者我们以后再还一只狗给他。一个预科学校的学生，对高纯度可卡因走私万美元到1984在美国的真实故事。预科生的连接记录一批私立学校的学生谁跑药品配送作业在上世纪80年代初的功勋。故事的主角托比，下层阶级的奖学金的学生，他利用自己的名声和药物的获取与受欢迎的孩子交朋友，最终让他培养一个贩毒网络。托比得到的远超过他的头他带他的朋友到哥伦比亚贩毒集团的危险的世界。范鄂林附和道：她是鬼迷心窍了，大爷不过是图个新鲜，暂时宠信他而已……过两年年老色衰，什么都不是。