java 编程 设计一个学生类

public class Student {
String name;
int age;
public Student(String name, int age) {
this.name = name;
this.age = age;
}
public void show(){
System.out.println("学生name="+name+";学生age="+age);
}
}
class Undergraduate extends Student{

String degree;
public Undergraduate(String name, int age,String degree) {
super(name, age);
this.degree = degree;
}
public void show (){
System.out.println("学生name="+name+";学生age="+age+";学生degree="+degree);
}

}