public class Undergraduate extends Student { private String degree; public Undergraduate(String name, int age, String degree) {  super(name, age);  this.degree = degree;
    } @Override  public void show() {  super.show();
        System.out.println("学位：" + degree);
    }
}
public class Student { private String name; private int age; public Student(String name, int age) {  this.name = name; this.age = age;
    } public void show(){
        System.out.println("姓名：" + name + "\n年龄：" + age);
    }
}
public class TestStudent {  public static void main(String[] args) {
        Student s1 = new Student("yhviews", 20);
        Undergraduate u1 = new Undergraduate("zeal", 22, "本科");
        s1.show();
        u1.show();
    }
}