class Student {
     String name;  int age;   public Student(String co_name,int co_age){  name = co_name;  age = co_age;    }
  public void show(){
        System.out.println("我的名字是"+name+":"+age+"years old!");    }
} class Undergradute extends Student{
    String degree;  public Undergradute(String co_name,int co_age,String getDegree){  super(co_name,co_age);    degree = getDegree;  }  public void show(){
        System.out.println("我是"+name+",今年"+age+"岁,学位是"+degree);  }
} class Test{  public static void main(String[] args){
        Student stu1 = new Student("明仔",23);    Student stu2 = new Student("红红",22);    Student stu3 = new Undergradute("继伟",30,"本科");    Student stu4 = new Undergradute("小霞",28,"研究生");     stu1.show();    stu2.show();  stu3.show();  stu4.show();  }
}