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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.运动全能的中学女汉子韩梅梅，各项成绩尚可，但一提起英语就头疼得要命。《极限挑战第八季》是东方卫视推出的互动励志体验类节目，节目以“一起挑战，共向未来”为主题，通过对更多社会横截面的记录，为观众传递快乐。这些倒是省事了，越王不偏不倚，居中坐卧不宁，同时挂心两边。面色黝黑，皮肤粗糙，然深色眼影衬得双眸幽深，凛寒慑人。本剧中所涉及的故事有一半根据真实的个案改编。　　本片根据韩国漫画家许英万的原作《第七个球队》改编