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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.[Truth] On February 25, Xinhua News Agency issued a document entitled "Where did the northeast village where the ceremony collapsed and the music broke?" -Behind a fictitious report, "the article said: The reporter went deep into the place where the incident took place and found that the" diary of returning home "was not a" work of returning home ". The" time, characters and place "depicted in the article were fictitious. Reporters learned from the Propaganda Department of Liaoning Provincial Party Committee that this article is a fiction.Attackers can use ICMP/IGMP flood attacks and UDP flood attacks to directly launch distributed denial of service attacks that consume network broadband resources. However, this attack method is not only low, but also easy to find the source of the attack. Although attackers can hide by forging the source IP address, a better way is to use reflection attack technology.范依兰说道：李相是要杀了项羽报仇？对于李斯报仇的方式，范依兰还是颇有疑问的。安啦，安啦。This article is collected and sorted out by "Industrial Intelligence Officer" (Public ID: AI-CPS). Please indicate the source for reprinting!