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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.该剧讲述了主人公们分享在英宝高中发生的秘密的故事。于是乎一动不动，轻轻将披风揽过去。System.out.println ("observer2 has received! ");朱丽珠在危机中刚逃过豺狼，又误入虎口，命运虽跌宕起伏，却也因此明白了责任的重要性，反而理解了严望佳。严望佳也在拯救朱丽珠的历险中，明白了朱丽珠对自己的良苦用心，尝试着真正打开心扉走出失恋的痛苦。与此同时在此番历险中，女孩们成功逃离险境，在当地警方的协助下，拯救了许多被绑架挟持的无辜女孩。为了挽救最后的幸存女孩，一位潜心于一项突破性研究计划的儿童临床医学家凯瑟琳·迪恩，受命用现代高科技进入到昏迷杀手的大脑当中。她进入杀人凶手的灵魂无疑是一次奇异未知并且充满危险的旅程，当她进入后，一个FBI探员紧随其后，同时间赛跑去揭开层层线索，查找那个失踪女孩的下落。不幸的是，事情并没有像预期那样的顺利，凯瑟琳·迪恩发现她被困在了这个杀手的思维世界里，真正有欲罢不能的感觉。郑氏却没有出声。