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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.另一个黑名单叫「赵书维」，他是个好人，但他好到让人误会、误解、失望，就是个问题了——五年前，全世界都以为「他和郭勤勤在一起」了，但他却只当郭勤勤是最好的朋友！电影讲述了张静依（赵丽颖饰）、陈伊诺（吴映洁饰）、梁小艺（班嘉佳饰）三个性格各异的女孩携手走过人生中最美好的十年，朝着各自的人生目标懵懂成长的故事。笑泪交织，引人入境。? ? ? We all know that C source is very powerful. Our great Linux is written by C source. It is different from Java. Java is object-oriented programming, C is process-oriented, what is process-oriented and what is object-oriented programming? I think since you read this article, you must understand. Then we also know that Java needs JDK virtual machines to work. The reason why Java is very cross-platform is not its own advantage, but that JDK can be installed on different platforms. JAVA runs on JDK, so his cross-platform is very strong, so popularize common sense. Then the C source is actually the same. The C source runs on the machine, so we all know that the machine has a big characteristic, that is, it can only read the machine code, so the C source we have written cannot be directly known to him, and it can only be compiled.说罢，不等杨蓉回答，陈启赶紧离开。"Then our artillery group resumed its fire support to position 142 after destroying the Vietnamese artillery group. Will the situation be much better then?" I asked.　　但是没想到殷雄一生桃花不断，总是经常遇到一些令人血脉喷张、难以招架的优质女人，都差点使得殷雄落入美人陷阱里。