Question

Programming language: JAVA

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 monthly appointment, check whether the day of the month matches. Ask the user to enter a date to check (for example, 2006 10 5), and ask to user if they want to check against OneTime, Day or Month appointment. Based on what the user selected, OccursOn inside each of the sub class should run and display any matching appointment and associated descriptions.For OneTime subclass, OccursOn need three inputs (Year, Month and Day) to validate, for Day subclass, OccursOn needs one input (Day) to validate, and for Month subclass, OccursOn need one input (Month) to validate. OccursOn is different for different subclasses. There should be appointments already created and you are simply asking the users for a date to check against them.

Answer 1

Below is your code, Let me know in comments if you face any issue

Appointment.java

import java.util.Date;

public class Appointment {
   protected String description;
   protected Date date;

   public Appointment(String description, Date date) {
       this.description = description;
       this.date = date;
   }

   public String getDescription() {
       return description;
   }

   public void setDescription(String description) {
       this.description = description;
   }

   public Date getDate() {
       return date;
   }

   public void setDate(Date date) {
       this.date = date;
   }

}

OneTime.java

import java.util.Calendar;
import java.util.Date;

public class OneTime extends Appointment {
   public OneTime(String description, Date date) {
       super(description, date);
   }

   public boolean OccursOn(int year, int month, int day) {
       Calendar cal = Calendar.getInstance();
       cal.setTime(this.date);
       if (cal.get(Calendar.YEAR) == year && cal.get(Calendar.MONTH) == month
               && cal.get(Calendar.DAY_OF_MONTH) == day) {
           return true;
       } else {
           return false;
       }
   }
}

Daily.java

import java.util.Calendar;
import java.util.Date;

public class Daily extends Appointment {
   public Daily(String description, Date date) {
       super(description, date);
   }

   public boolean OccursOn(int day) {
       Calendar cal = Calendar.getInstance();
       cal.setTime(this.date);

       if (cal.get(Calendar.DAY_OF_MONTH) == day) {
           return true;
       } else {
           return false;
       }
   }
}

Monthly.java

import java.util.Calendar;
import java.util.Date;

public class Monthly extends Appointment {
   public Monthly(String description, Date date) {
       super(description, date);
   }

   public boolean OccursOn(int month) {
       Calendar cal = Calendar.getInstance();
       cal.setTime(this.date);

       if (cal.get(Calendar.MONTH) == month ) {
           return true;
       } else {
           return false;
       }
   }
}

AppointmentTester.java

import java.util.ArrayList;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.Scanner;

public class AppointmentTester {
   public static void main(String[] args) {
       List<Appointment> appointments = new ArrayList<>();
       appointments.add(new Appointment("see the dentist",
               new GregorianCalendar(2006, 10, 5).getTime()));
       appointments.add(new Appointment("passport office visit",
               new GregorianCalendar(2006, 11, 11).getTime()));
       appointments.add(new Appointment("Monthly Bank visit on First day",
               new GregorianCalendar(2006, 1, 1).getTime()));
       appointments.add(new Appointment("Yearly checkup in December",
               new GregorianCalendar(2006, 11, 1).getTime()));
       appointments.add(new Appointment("Salary day, last day of month",
               new GregorianCalendar(2006, 11, 31).getTime()));

       Scanner sc = new Scanner(System.in);
       System.out.print("Enter a date in format (YYYY MM DD): ");
       int year = Integer.parseInt(sc.next());
       int month = Integer.parseInt(sc.next());
       int day = Integer.parseInt(sc.next());
       System.out.print("Select one option below:" + "\n1. One Time"
               + "\n2. Day or date of the month"
               + "\n3. Monthly or month of the year"
               + "\nSelect one option (1,2,3): ");
       String choice = sc.next();
       sc.close();

       List<Appointment> occuringApps = new ArrayList<Appointment>();
       if (choice.equals("1")) {
           for (Appointment appointment : appointments) {
               OneTime app = new OneTime(appointment.description,
                       appointment.date);
               if (app.OccursOn(year, month, day)) {
                   occuringApps.add(appointment);
               }
           }
       } else if (choice.equals("2")) {
           for (Appointment appointment : appointments) {
               Daily app = new Daily(appointment.description, appointment.date);
               if (app.OccursOn(day)) {
                   occuringApps.add(appointment);
               }
           }
       } else if (choice.equals("3")) {
           for (Appointment appointment : appointments) {
               Monthly app = new Monthly(appointment.description,
                       appointment.date);
               if (app.OccursOn(month)) {
                   occuringApps.add(appointment);
               }
           }
       } else {
           System.out.println("Wrong Choice . Please start over. ");
           return;
       }
       if (occuringApps.size() > 0) {
           System.out.println("Below are your appointments: ");
           for (Appointment appointment : occuringApps) {
               System.out.println(appointment.description);
           }
       } else {
           System.out.println("No appointments on given date.");
       }
   }
}

Output

Enter a date in format (YYYY MM DD): 2006 11 5
Select one option below:
1. One Time
2. Day or date of the month
3. Monthly or month of the year
Select one option (1,2,3): 3
Below are your appointments:
passport office visit
Yearly checkup in December
Salary day, last day of month