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The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows:脾气火爆的篮球名教罗伊在在输掉一场大学联盟比赛后被迫降级，去执教一只屡战屡败的高中球队。在第一堂课上，罗伊眼看着孩子们输掉109分，而且似乎这还不是最坏的……罗伊只能从最基本的东西开始教起，过人、抢篮板球、漏球、投篮，他似乎带给这个球队很多魔力，熔炼工球队也在他的带领下越打越顺，而罗伊也在教授这些孩子的过程中体会到了篮球带给他的那种久违的快乐……还没吃亏够是不是？高凡问小苞谷：篮子上面系得什么东西？小苞谷很诚实地答道：是被单。无崖子误中叛徒丁春秋的毒功，被逼归隐，伺机重振雄风。丁春秋大闹少林，欲夺少林二宝“易筋经”和大还丹，并说服李秋水与之联手。少林弟子虚竹得无崖子传百年神功，独斗两大高手。危急之中，巫行云助虚竹和阿紫打败丁春秋，又点化李秋水醒悟后皈依佛门，她自己则在落日的余晖中飘散白发走向远方。阿紫得到玉玲珑成为灵鹫宫新的主人。左十七是家中的独女，自幼被父亲宠溺长大，她没心没肺、活泼开朗、爱玩爱笑，虽有些牙尖嘴利但也却不乏聪明机智，左十七朋友众多，因此在哪里都很吃得开。8. Repeat the above stages;9-4 Number of diners: In the program written to complete Exercise 9-1, add an attribute named number_served and set its default value to 0. Create an instance named restaurant from this class; Print how many people have eaten in this restaurant, then modify this value and print it again. ?