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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.　　原来，警方已然发出警告，正在这个神秘的小岛上通缉一对你还要追究我们责任？李聪云的脸都快气白了。Let's take a look at these four chu animals　　一色老师擅长研究犯罪，经常协助在查案中走进死胡同的镰仓警察破案。因为牵扯到魔怪与幽灵，所以镰仓的案件用平常手段是无法解决的。而精通心灵搜查的一色老师便因此成了名侦探。某天，警方托一色老师调查大富翁被杀案。那件案子看起来不是人类所能犯下的。你怎么到这了？怎么没跟爹娘一起，跟他们走散了？香荽先尽力撒了几滴泪。The Interface Segmentation Principle (ISP) means that it is better to use multiple specialized interfaces than to use a single total interface. That is to say, don't let a single interface take on too many responsibilities, but should separate each responsibility into multiple specialized interfaces for interface separation. Too bloated an interface is a kind of pollution to the interface.