根据下面要求，编写一个Java应用程序：

　　①定义类StuCard，用到类成员变量(人数)和实例成员变量：学号、姓名、性别、专业、年级、籍贯等

　　②初始化的时候用到构造方法，提供两个以上构造方法

　　③多个类（业务类StuCard和测试主类），用到包的概念，且分别放到不同的包中

　　④用到类成员访问权限，要求类成员变量为Public，实例成员变量为Private

　　⑤制作公有的set和get方法与外界通过消息调用的方式通信

　　⑥在主类中实现对业务类StuCard的读、写、修改属性等功能

-According to the following requirements, write a Java application: ① defined classes StuCard, use the class member variables (the number) and instance member variables: student number, name, gender, major, grade, place of origin, etc. ② constructor initializes when used, provide two or more constructors ③ multiple classes (business class StuCard and test the main class), the concept of package used, and were placed in a different package ④ use class member access required class member variables Public, examples member variables Private ⑤ making public the set and get methods with the outside world by way of a message calling communication ⑥ achieve business class StuCard read in the main class, write, modify properties and other functions