Collecting in seperate classes

Question

I have a class that sets up one appointment called Appointment, and this needs to pass each Appointment to another class called AppointmentDiary, which stores the appointments in an ArrayList.
My question is how do I make a collection of Appointments in a different class AppointmentDiary, my code is below:
import java.util.*;
class Person {
protected String email_id;
protected String firstName;
protected String surname;
public Person() {
Person p=new Person();
public Person(String email_id, String firstName, String surname) {
this.email_id=email_id;
this.firstName=firstName;
this.surname=surname;
public String getName() {
return firstName + " " + surname;
class Manager extends Person {
private int room;
public Manager(String email_id, String firstName, String surname, int room) {
super(email_id, firstName, surname);
this.room=room;
public String getName() {
return super.getName();
public int getRoom()
return room;
class Employee extends Person {
public Student(String email_id, String firstName, String surname) {
super(email_id, firstName, surname);
public String getName() {
return super.getName();
class Appointment{
private int slot;
private String purpose;
Employee e=new Employee("js","John", "Smith");
Manager m=new Manager("jb","Jane", "Bennet", 21);
public Appointment(int slot, String purpose) {
this.slot=slot;
this.purpose=purpose;
public String getStudent() {
return s.getName();
public String getAppointment()
return s.getName() + " Has a meeting with " + l.getName() + " at " + slot + " Purpose: " + purpose + " in room " + l.getRoom();
class AppointmentDiary {
private Appointment collection;
class TestAppointment {
public static void main(String[] args) {
Appointment a=new Appointment(12, "Meeting");
System.out.println(a.getAppointment());
Thanks

Answer 1

import java.util.Vector;
Vector appointmentList = new Vector();
appointmentList.addElement(appointment);
//then to get them out
for(int i =0; i <appointmentList.size();i++){ //it may be length()
Appointment whatever = (Appointment)appointmentList.elementAt(i);
System.out.println(whatever.getAppointment);