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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.花开了！你还在！如果，青春可以重来，也许，只是也许~~~　　他的确赢得了其他人（包括与他同行的另外三位特工）的尊重，但……他的这次行动是未经授权的。Second: Report林盆（古巨基饰）自幼被一村妇所救，并与村妇之子林碟一起成长。二人个性各有不同，但感情深厚，情同亲兄弟。一次，林盆误打误撞救了三绝谷掌门君子剑夏侯谆，并因此被纳为三绝谷大弟子。林盆最初喜不自胜，但后来逐渐发觉夏侯谆原来金玉其外，败絮其中。反而，被千夫所指的烈火神枪慕容白，其行为正义凛然。Public interface Subject {老管家把手一缩，讪笑道：这不好吧。