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Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.3. Add verification codeThis Break　　陈重意识到自己将伤害这辈子对自己最重要的两个人，一个是同床共枕的老婆，一个是生死与共的兄弟。但他并没有意识到，故事，才开了一个头儿而已。后来他重返朝堂，告老后又在小青山办了这个书院，天下皆知，他难道不知道？知道了又怎忍心不来探望？今日四弟七十寿辰，他难道就忘了？若是没忘记，就算没接到你的书信，也该自己赶来。寻求着自己失去的愿望，环伊吕波的故事开始了——。她在战场上拼了几年，抓这样的宵小之辈简直易如反掌，因此那人就倒霉了。