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四川巫山，一个因三峡工程而即将被淹没的小镇。拖着幼儿寡居的旅馆职工陈青打算再婚，一直照顾她们母子并和她有着暖昧关系的旅馆经理老莫想为她讨个公道，缠着正为婚事奔波的民警小吴要揭发一起强奸案，并找到了强奸犯--长江信号工麦强。受害人陈青否认发生过任何事，而麦强在朋友眼中是个不折不扣的柳下惠，连送上门的女人都不动邪念，会犯下这种事吗？毛海峰闻言，转头望向虚弱的杨长帆：你看，这个人也没有看清楚状况，你们觉得能谈条件，其实呢？毛海峰转而冲庞取义喊道：好吧。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.众人听了精神大振：这条路上来往运送物资的队伍频繁，这些人根本不敢久留，只要能拖住他们，就有胜算。日子是平淡些，久了就习惯了。洪庆心里一惊，冷汗就下来了，羞愧低头道：李老爹没说。