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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.台阶上，何坤少不得一番演讲。哦？刘邦眼珠子一动，问道：伱这么急忙地单独见寡人，可是有什么要紧事情？张良直言道：汉王，臣在关中见过了萧何和韩信，我们都以为现在的形势对我们很是不利，所以臣才匆忙赶来，有要事和汉王相商。　　3×10《Witness》：所有剧情线索都汇聚到Railly和Cole身上。Titan逼近，盟友被迫自相残杀，「见证者」站到命运的入口。5. Click to download: "Application Form for Charge Certificate Business". Doc, fill in and affix the official seal派出所民警丁捷和爱心医院呼吸科医生江箫的婚礼已多次推迟。在领导和同事们的多次催促下，他们终于放下工作，踏上了甜蜜的新婚旅程。谁知非典疫情突然爆发，出于强烈的责任感，他们毅然提前结束蜜月，立即返回了北京……壁の小説 大塚寧々 升毅