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或许其中有很多自己不知道的情况的，若是其他的地方，范依兰未必会想这么多。Actively create an object with the new keywordHa ha刘邦不由的轻轻点点头。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.南宋末，侠士张真盗玺离京，亡命之际误伤了乘花轿出嫁的柳婉容。容垂危之际幸得樵夫天生相救。但却惹来闲言，容未婚夫杨凭虎因而悔约退婚。容父柳鹤亭为存颜面，令容往道观斋守一生，容伤心投河恰为生所救，二人避居山野互生情愫。此时，生亦救了伤重的真，真感生诚实忠厚，乃将玉玺相托，后容为生诞一下子，此事被凭虎所知，虎妒恨之下竟扮作山贼将生打成重伤，容扶生及幼子往求父，但亭见死不救，最后生重伤身亡，容亦因此殉夫自尽，死前将儿子交托婢女抚养。二十年后，容子凌岸枫长大成人，与好友石松出镇谋生，并先后认识了虎之女杨千千以及用客栈掩饰身分的反元义军江腾、敖非洇，江、敖等混入镇内主要是为刺杀蒙古王爷布木耳，枫初暗恋敖，但敖的美貌亦引来柳彦龙的追求。另一方面，枫在偶然机会下遇上外公亭，并得亭器重收为徒。此时玉玺流落民间的消息传出，耳与江等均落力追查，到底凌岸枫如何查出自己的身世秘密呢？玉玺又会落在谁人之手呢？Next, we are going to implement the Validator class, which is used here as Context and is responsible for receiving the user's request and delegating it to the strategy object, as follows: