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二更求粉。The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.某商业部门的贾主任是家庭妇女华家芳的丈夫，他极力反对妻子学理发， 家芳趁其外出的机会，参加了理发行业的工作。一天，家芳接获丈夫将于当天回家的信件，心慌意乱，以致在为顾客服务时，发型走样，遭到顾客的责难。Successville is a surreal place with a high celebrity homicide count. DI Sleet enlists the help of a genuine celebrity sidekick to solve the latest high profile murder.本剧讲述了被不应该出现于世的那个东西迷惑的人们，与追查前所未有怪异事件的考古学家们发生的一系列故事。1Maybe I am a. Forget it, I wish everyone an early brush to the night talk egret ~