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If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.　　此剧采用一剧上下两部的形式，上半部剧的主题是＇贝塔项目＇，讲述2017年外星人题材的奇幻悬疑故事。红椒立时双目放光，真的？娘，你真是太好了。1. Return to + PONG.Understand the basic principle of using single mode to realize pop-up window.开朗乐观的女孩林多美（赵韩樱子 饰）仿佛是被上苍眷顾的幸运儿，她相貌美丽，性格和善，家境优渥，并受过良好教育，如果不是遇到那个曾被她视作真命天子的陈笑飞（蒋毅 饰），她的人生也许会更加令人欣羡。在她和陈走入婚礼殿堂的第四个年头，哥哥林多俊（李泰 饰）也终于决定和女友文馨（海陆 饰）携手终生。文馨拥有不幸的童年和悲伤的恋爱经历，磨难让她的性格朝向错误的方向发展。婚后文馨意外发现，妹夫陈笑飞竟然就是她当年的初恋男友。严重的心理落差加上旧情复燃，让癫狂的种子生根发芽。另一方面，陈在林家的公司中并未得到重用赏识，这也让他心中萌生不满。一群心怀济世理想的少年人在刺客学苑中苦修武艺，纷纷盼望完成学苑试炼，离苑行侠仗义。排行第一的学霸少女韩小楚首个获得试炼机会，眼看就能出师，却被吊儿郎当的废柴同学龙辟邪干扰，于最终试炼中失利。紧接着，一系列惊悚事件接连发生：试炼突然变成危及性命的追杀、废柴龙辟邪其实是武功绝顶的高手、追杀他们的人是学苑教师，而当死里逃生的韩小楚一觉醒来，却发现她唯一可以依靠的龙辟邪神秘失踪