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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.1968年，北京的钟跃民和好友袁军、郑桐等整日游荡在大街上，为单调的生活寻求着刺激。在一场钟跃民看来似乎平常的不能再平常的恶作剧中，高雅、纯情、浪漫的周晓白无意中闯进了钟跃民的生活，二人的生活悄无声息的改变着。晓白的高雅、浪漫唤醒了潜藏在跃民内心深处的一种久违了的渴望。在袁军、郑桐等童年伙伴的戏弄下，钟跃民向晓白展开了充满嬉闹而又看似认真的追求。格里罗饰演的司机在一场失败的银行抢劫案后驾车逃逸，意识到自己被出卖了，家人的生命也危在旦夕。在生死时速的逃命过程中，他要试图找出叛徒完成自我救赎，而唯一能相信的人是他14岁的女儿。《九星天辰诀》讲述了男主角叶辰因一把神奇的飞刀穿越到异世大陆，突破重重艰难险阻，最终参悟了至高心法“星衍飞刀”及练气法门“九星天辰诀”，成为生命祖神的故事。同名网剧以主角叶辰的视角，辅以爱情元素为佐料，用无厘头的方式表现出了他在除妖之路上发生的一幕幕啼笑皆非的桥段。白川的行为是杀人还是过失致死连日被议论中，已经被议论的安乐死法案的成立带有现实意义。在那个背后策划日本的医疗改革的团体，更加使用反对派的医生和宣传媒体安排安乐死法案的阻止的康代。白川不久就被急流吞没了。随后张良命令在彭城召集逃回来的汉军士卒。2. Transcription of "Yi-ology Design Pattern 1.4 How to Learn Design Pattern" Guo Zhixue People's Posts and Telecommunications Publishing House