public class Student {     public int age;     public String name;     public Student(String name,int age)     {      this.name=name;      this.age=age;     }  public void show() {   System.out.println("This student is "+this.name +", age is "+this.age);  } } public class Udergradute extends Student {  String name;  int age;  String degree;  public Udergradute(String name, int age,String degree) {   super(name, age);   this.name=name;   this.age=age;   this.degree=degree;   // TODO Auto-generated constructor stub  }  public void show() {   System.out.println("This undergradute is "+this.name +",age is "+this.age+",degree is"     + " "+this.degree);  } } public class test {  public static void main(String[] args) {  Student s1=new Student("Lemon",18);  Udergradute s2=new Udergradute("Sissy",23,"doctor");  s1.show();  s2.show();  } }