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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.This site has collected and sorted out a large number of exercises and answers, please use the site to find out当年，日寇铁蹄踏上了古城邯郸，在赵武灵王丛台上，日军大佐浅田芳雄对记者口吐狂言：要实现对占领区的军事打击、经济控制，要全面推行奴化中国的文化渗透。因兵燹水火而停办三年的邯郸庙会，在侵略者和汉奸的阴谋策划下而恢复。久负盛名的平调、落子名角“盖九州”、“七岁红”、“水仙花”等登台唱...一语提醒了板栗。2022年，格外大的「提高hoshi」！Column Title: Happy Play Garden俩个戴帽子的多爪软体动物