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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.一个年轻的母亲Cora Tanner（Jessica Biel饰）在公众犯下一件令人吃惊的暴力行为，但无人知道她的动机。而一位流氓似的调查员对她的动机陷入执着，在他的调查过程，他与对方一同走进她的内心深处，在这悲惨的「旅程」将发掘出隐藏在她过去的暴力秘密。Bill Pullman饰演Harry Ambrose，是个感性﹑顽强的侦探，他发现自己着迷于Cora的案件中，幷且深信这案件有着被深藏在背后的真相，因此开始调查Cora的生活。宋紫，一个俏皮可爱的喵女孩，陆吾，一个外冷内热的帅气男孩，他们因为猫咪而经历了一场不打不相识的相遇。二人力求在喵星人和人类之间寻找一个相爱的支点，整个过程充满了人类与爱宠之间的治愈，令人暖意倍生，同时二人的日常相处也趣味横生，笑点不断。曹氏见了招手道：红椒。Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.那会儿，郑家比李家富，青木又比爹年轻，还识字，人品也不错，爹觉得，你娘要是嫁了他，肯定比嫁给爹过得好。