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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.II. Test SurfaceKabi Ball本剧为《绝命毒师》的前传，讲述律师Saul Goodman的故事。故事紧接上季结尾，阿布奎基（Albuquerque）律师Jimmy McGill遭到哥哥Chuck的背叛，于是回到伊利诺伊州的家乡西塞罗（Cicero）与童年死党Marco（Mel Rodriguez）一起策划一系列诈骗诡计。他们成功了，但Marco在他们最后一次干脏活时突发心脏病。Marco死后，Jimmy回到了新墨西哥州，他的人生似乎有了新的意义。他拒绝了圣达菲（Santa Fe）一家大型律师事务所的工作邀请，朝着刑事辩护律师「Saul Goodman」的方向迈出了一大步，他「清白正直」的日子一去不返。他的转型……已然开始。但是制片人反复强调，你不会在本季看到一个完整的Saul Goodman，「Jimmy McGill才是该剧的灵魂人物」，「我们要描述的是他的故事」，「我们不会这么快和他道别」。可是谁想一分钟不到，陈启已经坐在了台上。Sheila Hood is an ex-cop whose marriage is on the rocks. Rather than confronting her husband about an affair, she hides surveillance cameras in her home and watches his transgressions, becoming a voyeur of her own life. Her husband, Tom Kale, is an ornithologist who begins an affair with an ex-girlfriend, Merle James, whose beauty and fragility echoes that of the birds he studies. Ray Starling, the charismatic owner of a boutique hotel, is Merle’s lover, and has dealings with her father, Mr James, a powerful oil baron who operates in the shadows but whose influence touches the whole city. Merle’s younger sister, Hazel, is also drawn to Tom, but trapped in Starling’s web of power. Calvin is an cop whose loyalty to his ex partner, Hood, is tested when mounting evidence from her own surveillance tapes connects her and Tom to Starling’s murder, and perhaps even Merle’s mysterious death.