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One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.先生教训的是，今日本官无权分田。真诚率真的天齐国第一女捕快郝可爱和隐藏身份的宰相之子高子琛共同探案、寻找真相。草草问了几句后，暂时将陈离收押，然后赶紧派人去王府送信，并通知大理寺正卿张杨。该剧改编自同名漫画，讲述拥有外貌自卑情结通过化妆变成女神的周京与怀着不为人知的伤痛的修豪相遇后分享彼此的秘密渐渐成长恢复自尊心的爱情喜剧。Mkvirtualenv zqxt: create runtime environment zqxt