The question I need help with is the following: Improve the appointment book pro

Question

The question I need help with is the following:

Improve the appointment book program by letting the user save the appointment data to a file and reload the data from a file. The saving part is straightforward: Make a method save. Save the type, description, and date to a file. The loading part is not so easy. First determine the type of the appointment to be loaded, create an object of that type, and then call a load method to load the data.

The following is the appointment book program question that they are referring to. I do not need help solving this, but it may be useful as a reference:

Implement a superclass Appointment and subclasses Onetime, Daily, and Monthly. An appointment has a description (for example, "see the dentist") and a date. Write a method occursOn (int year, int month, int day) that checks whether the appointment occurs on that date. For Example, for a montbhyl appointment, you must check whether the day of the month matches. Then fill an array of Appointment objects with a mixture of appointments. Have the user enter a date and print out all appointments that occur on that date.

Explanation / Answer

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Appointment
{
private String description;
private Date date;
public Appointment(String description, int year, int month, int day) throws ParseException
{
this.description = description;
DateFormat dateFormatter = new SimpleDateFormat(String.format("yyyy-MM-dd"));
this.date = dateFormatter.parse(String.format("%d-%d-%d", year, month, day));
}
public boolean occursOn(int year, int month, int day) throws ParseException
{
DateFormat dateFormatter = new SimpleDateFormat(String.format("yyyy-MM-dd"));
Date checkedDate = dateFormatter.parse(String.format("%d-%d-%d", year, month, day));
return checkedDate.equals(this.date);
}
public void print()
{
System.out.println(String.format("Appointment: %s Date: %s", this.description, this.date.toString()));
}
public Date getDate()
{
return this.date;
}
}

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