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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.神童安托瓦内特和她的妹妹艾米莉，因为试图吹嘘的非法石油钻井计划，导致一个超级火山的猛烈爆发。一个关于友情、爱情，也关于80、90后们的故事。四个爱玩游戏的大学男生以轻松搞笑的风格演绎着一个个令人捧腹的故事，你能在他们的表演中找到自己的影子，或许他们的故事就是你的现实。他们是谁，他们和你一样，是热爱游戏、热爱生活的“好青年”……还有，经过眉县县城的时候，去悦来客栈找一位周菡姑娘，她主仆二人要去青山书院求学，你一路上照应她些。这家酒吧叫Horace and Pete，开了一百年，这一个世纪由历代的Horace和Pete来经营。这家年迈的酒馆在光鲜的布鲁克林似乎已经过气了，现在的主人也如同这家疲倦的酒馆一样。Horace离过婚，没有固定女友，跟子女处理不好关系；Pete一辈子都在这家酒吧里，有精神疾病，一旦停药就会失控。还有他们的叔叔、姐姐、前妻、爷爷的前女友、不定期的床伴以及定期的老顾客，构成了属于这家酒馆的百年江湖。讲述了年轻警官闻涛由于一个无心之过，导致战友牺牲。因为心怀内疚，他毅然决定接替战友充当卧底。一路风雨，没想到越接近事实的真相，危险越大。当他最后撕开事实的面纱时，却发现了残酷的真相。亲情与法，孰轻孰重，闻涛在战斗中成熟起来。