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? 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. ?该剧主要讲述了陆军新兵郭小明和崔犇犇经过三个月的新兵集训下连当兵的故事。原本以为脱离新兵班长牛大峰“魔爪”的二人，做梦也没想到，牛大峰依然是新连队的班长。与此同时，郭小明的暗恋对象女兵舒雅和谭小美也分到了连队所在卫生队。牛大峰与卫生队队长彭小一在地方本就是情侣，因为当兵，牛大峰主动提出了分手，可未曾想彭小一竟然也投笔从戎来到了部队。就这样，猛虎连的男兵和卫生队的女兵们，演绎出了一场场让人啼笑皆非的故事。In fact, employees, experiences and students describe a role, for example, a person who is a "manager" must be an "employee". In the above design, a person cannot have multiple roles at the same time, and if he is an "employee", he can no longer be a "student". This is obviously unreasonable, because many on-the-job graduate students, even employees, are students.葫芦扯了一把板栗，恭敬地对苏文青施礼道：多谢文青叔教导。Editor of 10,000 Yuan Wang Qing's "Finland Unconditional Basic Income Experiment Series Report": Cui Yu