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剑刃出鞘，如一泓秋水，寒意阵阵，剑刃极为锋利，青芒闪动。详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.道光十九年，道光帝为除“三害”，命林则徐赴广州禁烟，两江总督陶澍整顿盐政，又命户部侍郎爱新觉罗•铁麟为仓场总督，赴通州漕运码头铲除日益猖獗、积重难返的漕弊。漕运码头上官衙林立，文武交织，三教九流，盘根错节，形成了一个贪污腐败、危机四布、黑幕重重的独立王国。铁麟乃宗室贵胄，为了不负圣恩，重塑先祖辉煌，他口衔天宪，上任伊始即大刀阔斧地清弊惩奸，以期建功立名。户部尚书王鼎对铲除漕弊早有准备，几年前就在坐粮厅安插了心腹，并收集了武英殿大学士穆彰阿一手遮天，贪污漕粮巨款的确凿证据。然而，线人黄槐岸的神秘失踪、坐粮厅汉厅承许良年的阴险歹毒、青帮头目周三爷的呼风唤雨，通州知州夏雨轩的运筹巧计，服侍铁麟的奶妈韩小月的神秘身世以及江湖巫医唐大姑的若隐若现，却将漕运码头搅得雾障迷离，悬疑丛生。就在铁麟舍身舍名力挽沉疴之际，其爱女甘戎及不肖子甘瑞又从黑白两道搅进了漕运码头，从而引发了一系列怪异诡秘乃至人命大案。漕运码头上，一场针锋相对的生死搏杀就此展开。9-8 Permissions: Write a class named Privileges that has only one attribute-Privileges, which stores the list of strings mentioned in Exercise 9-7. Move the method show_privileges () into this class. In the Admin class, a Privileges instance is used as its property. Create an Admin instance and use the method show_privileges () to display its permissions. ?　　故事以1934年的白洋淀为背景，以嘎子梦想参加八路，梦想得到一支属于自己的真枪展开。奶奶为了保护八路老钟牺牲了，嘎子只身上县城找传说中的罗金保，打鬼子替奶奶报仇。在县城结识了集贤居少掌柜佟乐，嘎子仇没报，反而陷入鬼子追杀。在佟乐和一个神秘便衣的帮助下，脱离险境。