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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.? Generally speaking, the factory mode is suitable: whenever a large number of products need to be created and have a common interface, they can be created through the factory method mode. Of the above three modes, the first cannot create the object correctly if the incoming string is wrong, and the third does not need to instantiate the chemical factory class compared with the second, so in most cases, we will choose the third-static factory method mode. ?不禁心下生疑，问道：何字？高易沉声道：中车府。Setting position, foam type (referring to low, medium, high, anti-dissolution, fluorine protein, etc.), system form (referring to liquid, liquid, fixed, semi-fixed, etc.), foam fire extinguishing system diagram.该剧讲述在混乱的时代，即使是在一触即发的情况下谈判队也坚持通过对话和沟通的活动来解决问题，通过此来彰显出解决我们社会矛盾的解决方案的电视剧。故事背景确定在武则天执政时期，女官谢瑶环因破获宫中奇案被武则天赏识，以巡按身份派去江南彻查两任钦差被杀一案。朝廷贪官腐败、草菅人命，女巡按谢瑶环凭借自己对案件的敏感和执著的性格。破获一桩柱冤案，南下一路，谢瑶环历经艰险，以女性独特的视角破获数桩奇案……