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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.皇城南门楼上也是旌旗招展，簇拥着正中龙风雉羽、华盖垂缨，永平帝早已率文武百官等候多时了。After withdrawing from the Red Mansions Dream League, Gu Xiqian did not withdraw from the network in the first place, but ordered an energy card for him under the urging of the mecha Zhinao, which climbed out of the cockpit. Yes...CBS于凌晨公布了2012年秋季时间档期表。CBS最值得关注的变化为：星期一的旗舰剧集《好汉两个半》（Two And A Half Men）被移动到星期四与另一部旗舰剧集《生活大爆炸》（The Big Bang Theory）作伴充满了阳光和活力的夏天到来了！为了应付炎热的天气和即将到来了秋冬，汀克贝儿（梅·惠特曼 Mae Whitman 饰）和她的仙子朋友们此刻正忙得不亦乐乎。虽然身为仙子，但也有着各自不同的喜恶，汀克贝儿和薇迪亚（Pamela Segall 配音）就一直看对方不太入眼，这不，为了一点小事，两人又吵了起来啦。#星际迷航：发现号##Star Trek Discovery#发现号才播了几集就获得第二季续订，新闻稿称这部剧为CBS网络平台吸引了破纪录的注册用户。因为江别鹤收到消息有人要杀他，于是江别鹤灵机一动，把小鱼儿扮成他自己，一来借刺客之手杀掉小鱼儿，二来也能趁机逮住那个刺客。