StudentClass,java文件中已有学生类Student包含属性有姓名name和年龄age，由学生类派生出本科生类Undergraduate和研究生类 Graduate。本科生包含的属性有专业specialty,研究生包含的属性有研究方向studydirection 每个类都有相关数据的输出方法，运行效果如下： 姓名：王军

年龄：23

学位：本科

专业：自动化

姓名：刘君

年龄：27

学位：硕士

研究方向：网络安全技术-StudentClass, java file contains the properties have been students in class have name Student name and age, age, derived from the class of undergraduate students and graduate classes class Undergraduate Graduate. The property contains a professional undergraduate specialty, postgraduate research attributes include studydirection each class has the data output method, run the effect is as follows: Name: Wang Jun Age: 23 Degree: Bachelor Major: Automation Name: Liu Jun Age : 27 Degree: Master' s research: network security technology