编写三个类，图书类、学生类和测试类，可以处理简单的书籍借阅情况，包括借书和还书等。图书类的数据成员包括书名、书号和借书学生等；方法包括借书、还书和显示书籍信息等。学生类的数据成员包括姓名、学号和所借书籍等；方法包括显示学生信息等。测试类是一个应用程序，在该程序中创建图书类和学生类对象，完成图书的借阅和归还。(Write three classes, books, students and test class, can handle simple books borrowing, including borrowing books and return books. Data members of class books including the title, number and library students; methods including the library, books and book information display etc.. Students' data members include name, number of students and books borrowed, etc. the methods include displaying students' information and so on. Test class is an application program, which creates books and student objects in the program to complete book lending and return.)