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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.The utility model has the following advantages:1937年，战争全面爆发，正在教会学校英语专科学习的孪生兄弟于明阳、于明辉毅然退学，满怀热情地考取了南京中央陆军军官学校，以报效祖国。生性文弱，颇具儒雅之气的明阳潜心学习，成绩优异；而明辉性情刚烈，尚武轻文，沉醉于舞刀弄棒，拳脚功夫，对书面军事知识毫无兴趣，受到教官的一次次处罚，终于在一次剧烈冲突中失手将教官打成重伤，惹下大祸的明辉在哥哥明阳的帮助下逃出军校，在苏北参加了中共苏北游击队，后改编为新四军。因于明辉作战勇猛，武艺超群，被选进了专门执行秘密任务的侦察队。到了侦察队后，除进行艰苦训练，还要在反战同盟教官的指导下练习各种武器，开车，接发电报等。其次还要学习英文、日文。于明辉有英语基础，又兼备武功，很快便提拔为队长，带队执行锄奸、猎杀日寇、搜取情报等任务，屡立战功，在根据地小有名气。于明阳1939年从军校毕业，因成绩突出被国防部报送到美国西点军校继续深造英王皱眉，示意身边人去看个究竟，并安抚百姓。徐公，总要做点什么。