设计一个学生类Student

设计一个学生类Student

其属性有：姓名(name)、年龄(age)、学历(education),由Student类派生出本科生类Undergraduate和研究生类Graduate，本科生类增加属性：专业(specialty),研究生类增加属性：研究方向(direction)。每个类都有构造方法和用于输出属性信息的show()方法，在测试类TestExtends中测试输出。

public class Test2 {    // TODO 自动生成的构造函数存根          public static void main(String agsp[]){              Student 小王;        小王 = new Student("小王",18,"高中");          小王.show();              System.out.print("——————————————————————————————");              System.out.println();              Undergraduate 小明;            小明 = new Undergraduate("小明",22,"大学本科","软件工程");              小明.show();              System.out.print("——————————————————————————————");              System.out.println();              Graduate 小李;              小李 = new Graduate("小李",25,"研究生","云计算");              小李.show();          }      }  class Student{     //创建学生类Student     private String name;    //姓名      private int age;    //年龄     private String education;   //学历     Student(String name, int age, String education) { //构造方法          this.name = name;         this.age = age;         this.education = education;         }    public void show() {        System.out.println("姓名："+name+"  "+"年龄："+age+"  "+"学历："+education);         }    } class Undergraduate extends Student{   //由学生类派生本科生类       private String specialty;    Undergraduate(String name, int age, String education,String spe) {        super(name, age, education);        this.specialty = spe;        }     public void show() {        super.show();        System.out.println("专业："+specialty);        }    }class Graduate extends Student{   //由学生类派生研究生 类    private String direction;      Graduate(String name, int age, String education,String dir) {      super(name, age, education);      this.direction=dir;      }    public void show() {            super.show();           System.out.println("研究方向："+direction);       }        }