package exercise1; class Student1{     String name;     int age;           Student1(String name,int age){         this.name=name;         this.age=age;     }     public void show(){         System.out.println("name: "+name+" "+"age: "+age);     } } class Undergrate extends Student1{      String degree;           Undergrate(String name, int age,String degree) {         super(name, age);         this.degree = degree;         // TODO Auto-generated constructor stub     }     public void show(){         System.out.println("name: "+name+" "+"age: "+age+" "+"degree: "+degree);     }      } public class StudentThree{     public static void main(String[] args){         Student1 student = new Student1("Bob", 16);         student.show();         Undergrate undergrate = new Undergrate("Alice", 24, "shuoshi");         undergrate.show();     } }