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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.张雷被父亲的老战友周志强抚养长大，并把他也培养成为了一名公安民警。　　HBO亚洲原创黑暗悬疑影集　《白衣校花与大长腿2》于2015年在第一季的姐妹篇，《白衣校花与大长腿2》主要讲述了男女主角的相处法则。因为女主阮清恬遭到不明身份的人绑架，男主任浩铭为了她的安全开始进行全天候“监视”，但脾气倔强的阮清恬无法忍受这样的保护，导致两人冲突频发，当这些冲突让两人的心越走越近时，男女主又遭到了各方势力的破坏和阻扰……虐心的爱情、悬疑的剧情，加上唯美的画风、劲爆的打戏，真是让人一看就欲罢不能！[女主的丈夫为了夺取女主的财产，让人将女主和孩子绑架，女主和孩子在一个小岛上被身为岛主的男主所救，渐渐与男主坠入情网。讲述日本战国时代末期发生的一场“决定天下”的战役，交战双方为德川家康领下的东军以及石田三成领导组成的西军。最终，在西军将领小早川秀秋叛变的情况下，这场战争在一天内即分出了胜负，德川家康取得了统治权，三年后成立德川幕府。