package a; public class Student{ private int age; private String name; public Student(String name,int age){ this.name=name; this.age=age; } protected void study(){ System.out.println(this.name+" is studying"); } public String toString(){ return this.name+this.age; } } package b; public class JuniorStudent extends Student{ private String id; public JuniorStudent(String name,int age){ super(name,age); } public void setId(String id){ this.id=id; } public String getId(){ return this.id; } public void test(){ study(); } }