声明两个接口，Show和Print，以完成通过接口实现多重继承。

构造class userInformation类作为extends的父类，其中定义f方法、g方法和showOut方法，分别实现方法的继承，重载，重写。

构造类telephoneCardUser，通过该类extends userInformation 以及implements Show,Print两个接口来实现本次实验的目的。-A statement both interfaces, Show and Print, in order to achieve multiple inheritance through interface implementation. Category as a class userInformation structure extends the parent class, one of the definition of f methods, g and showOut methods, implementation methods, respectively, inheritance, overloading, rewrite. Construction category telephoneCardUser, and extends userInformation through such implements Show, Print two interfaces to achieve the purpose of this experiment.