《漂亮的家教3》

天启老师，我最喜欢你的武侠了。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.再现了在以毛泽东同志为首的中国第一代领导人指挥下，华东野战军在齐鲁大地上进行的一场中国革命史上前所未有的城市攻坚战，夺取了济南，从而拉开了“三大战役”的决战序幕.....　　尹平安调至其兄生前驻守的警局，方正暗中授其枪法，使其枪法大进。同时，平安在一次办案中结识敖明，二人坠入爱河，当平安查出敖明是杀手，且怀疑其是杀兄仇人时心中困扰不已。After studying the design pattern during this period of time, I still have a lot of feelings, because when I am writing code now, I often think about whether I can use any design pattern to refactor here. Therefore, after learning the design pattern, I feel that it will slowly affect the way you think about writing code. Here is a summary of the design patterns. First, all the design patterns can be sorted out. Second, an index can be made to help everyone collect.我们会解决顾客的任何“困扰”！