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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.　　“Halt and catch fire”是一个早期电脑指令，执行后使计算机进入竞争状态。创新与探索，挑战与机遇，自负与贪婪，乔·麦克米伦，将引领这家不起眼的小公司，成为奔腾年代的新领头羊。[Miscellaneous Sentences]……已经临近八点，越来越多的人因为各种各样的理由，打开电视机，按到江南卫视台，耐心地等着。某社团老大乘车夜归途中遭人枪杀，凶手不知去向。该社团围绕继承人问题展开争论，为避免出现分裂与争执，社团元老马公（午马 饰）与王律师（黄霑 饰）商议，委托老大之名指定正直勤奋的阿修（李修贤 饰）为帮会继承人。岑港虽易守难攻，但终不是长久栖身之地。只觉陷入巨大的漩涡，分不清方向。