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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.该剧讲述了抗日战争爆发后，在柏林军事学院接受魔鬼训练的孟云霄（王新军饰演）搭军机去前线，被日机击落，落在了凤凰山。他临危不惧，反而当上了“大当家”，把凤凰山的土匪改造成为一支抗日劲旅。凤凰山原女匪首火凤凰（李彩桦饰演）对孟云霄渐生爱意，同时八路军的文化教员李姝蔚（秦海璐饰演）也被孟云霄多次相救，渐生好感。孟云霄同晋绥军师长郭万铭在多次交手后形成亦敌亦友的关系。在强大的敌人面前，两人摒弃前嫌，共御外侮。孟云霄逐步向八路军靠拢，将凤凰山的军队改编为“八路军太行山抗日纵队”，和日军展开了最后的生死较量，最终迎来了抗日战争的胜利。sean“圣科罗尔”。作为漫画家、插图画家活跃在这个领域，Return arrayInt;这一天，吴琳琳和往常一样，一边和人讨论着武侠小说，一边刷微-博。等从外婆家回来，这雪肯定化光了。青山咧嘴憨笑，说他二舅舅就在村里，大舅舅那大哥和葫芦会去，自己可以不出门，就在姐姐这玩。