#1: Validate that the month is valid (01 - 12), and the day is valid (01 -31) for a new appointment.

#2: Validate that the time is valid (hour 00 - 23; minutes 00 - 59) for a new appointment.

#3: Validate that an appointment does not conflict in time with an already existent appointment in the array of appointments.

4: Another Loop...

Prompt user to enter a date so that all appointments that fall on that date can be displayed. Upon displaying the information (or a not found message), ask the user if they wish to check for appointments on another date? If so, repeat the same method calls.

import java.util.ArrayList;

import java.util.Scanner;

abstract class Appointment{ // abstract class declaration

private String description; // variable declaration

private String lastName; // variable declaration

private int hours=0; // variable declaration and assign hours as 0

private int minutes=0; // variable declaration and assign minutes as 0

public void setDescription(String description){ // called method

this.description = description; // since parameter and member same use this to assign parameter

}

public void setLastName(String lastName){ // called method

this.lastName = lastName; // since parameter and member same use this to assign parameter

}

public void setHours(int hours){ // called method

this.hours = hours; // since parameter and member same use this to assign parameter

}

public void setMinutes(int minutes){ // called method

this.minutes = minutes; // since parameter and member same use this to assign parameter

}

public String getDescription(){ // called method

return this.description; // return descripton what we assign from parameter

}

public String getLastName(){ // called method

return this.lastName; // return lastName what we assign from parameter

}

public int getHours(){ // called method

return this.hours; // retuen hours what we assign from parameter

}

public int getMinutes(){ // called method

return this.minutes; // retuen minutes what we assign from parameter

}

abstract public boolean occursOn(int year,int month,int day); // calling method

}

class Onetime extends Appointment{ // derived class

/* members declaration*/

private int year;

private int month;

private int day;

public void setYear(int year) { // called method

this.year=year; // since parameter and member same use this to assign parameter

}

public void setMonth(int month) { // called method

this.month=month; // since parameter and member same use this to assign parameter

}

public void setDay(int day) { // called method

this.day=day; // since parameter and member same use this to assign parameter

}

public int getYear() { // called method

return this.year; // since parameter and member same use this to assign parameter

}

public int getMonth() { // called method

return this.month; // since parameter and member same use this to assign parameter

}

public int getDay() { // called method

return this.day; // since parameter and member same use this to assign parameter

}

@Override

public boolean occursOn(int year, int month, int day) {

// method to check overide or same data

if(this.year==year && this.month==month && this.day==day) // check overide or same data

return true; // if exist return true

return false; // if not return false

}

}

class Daily extends Appointment{ // DERIVED CLASS

@Override

public boolean occursOn(int year, int month, int day) {

// TODO Auto-generated method stub

return true;

}

}

class Monthly extends Appointment{ // DERIVED CLASS

private int day; // member declaration

public void setDay(int day) { // called method

this.day=day;

}

public int getDay() { // called method

return this.day; // since parameter and member same use this to assign parameter

}

@Override

public boolean occursOn(int year, int month, int day) {

// called method

if(this.day==day) // check same day or not

return true; // same day return true

return false; // not same day return false

}

}

public class TestAppointment { // class declaration

static Scanner sc= new Scanner(System.in); // scanner to accept data

public static void main(String[] args) { // main function

ArrayList al = new ArrayList(); // array list declaration

System.out.println("How many appointments do you with to make?");

int num = sc.nextInt(); // Accept number of appointments

for(int i = 1;i<=num;i++) { // Loop to appoint ment menu selections

System.out.println("Please make a selection:");

System.out.println("1. One Time Appointment");

System.out.println("2. Daily Appointment");

System.out.println("3. Monthly Appointment");

int selection = sc.nextInt(); // Accept the selection

al.add(makeAppointment(selection)); // add the appointments to array llist

}

System.out.println("*******Thank you for making all your appointments*********");

char choice='y'; // variable declaration

while(choice=='y') {

System.out.println("What is the date you wish to look up in your Appointment's Calendar");

System.out.print("Enter the month: ");

int month=sc.nextInt(); // Acceept the month

System.out.print("Enter the day: ");

int day=sc.nextInt(); // Acceept the day

System.out.print("Enter the year: ");

int year=sc.nextInt(); // Acceept the year

System.out.println("On "+month+"/"+day+"/"+year+" you have the following appointments:"); // print the appointments

for(Appointment a:al) { // Loop to run for all appointments

boolean isPresent=checkAppointment(a,year,month,day); // calling method

if(isPresent) { // check appointment exist

System.out.println(a.getDescription()+" with "+a.getLastName()+" at "+a.getHours()+":"+a.getMinutes()); // print appointment details

}

}

System.out.println("Do you wish to look up another date?");

choice=sc.next().charAt(0); // accept choice

}

System.out.println("Thank you for using Appointment Calendar.");

}

public static Appointment makeAppointment(int selection) { // called method

/* variable declaration*/

Appointment app=null;

String description="";

String lastName="";

int hours=0;

int minutes = 0;

int day=0;

int year=0;

int month=0;

sc.nextLine();

switch (selection) { // switch statement to selection

case 1:

Onetime onetime=new Onetime();

System.out.println("What is the description of your appointment?");

description = sc.nextLine(); // Accept description for appointment

System.out.println("What is your person's name?");

lastName = sc.nextLine(); // Accept person's name

System.out.println("What is the year of your appointment?(2017-2018)");

year = sc.nextInt(); // Accept year

System.out.println("What is the month of your appointment?(1-12)");

month = sc.nextInt(); // Accept month

System.out.println("What is the day of your appointment?(1-31)");

day = sc.nextInt(); // Accept day

System.out.println("What is the hour of your appointment?(1-31)");

hours = sc.nextInt(); // Accept hours

System.out.println("What is the minutes of your appointment?(1-31)");

minutes = sc.nextInt(); // Accept minutes

/*calling methods*/

onetime.setDescription(description);

onetime.setHours(hours);

onetime.setLastName(lastName);

onetime.setMonth(month);

onetime.setMinutes(minutes);

onetime.setYear(year);

onetime.setDay(day);

System.out.println("Appointment added with "+lastName+" on "+month+"/"+day+"/"+year+" at "+hours+":"+minutes); // print appointment holder details

System.out.println();

return onetime;

case 2:

Daily daily = new Daily();

System.out.println("What is the description of your appointment?");

description = sc.nextLine(); // Accept description

System.out.println("What is your person's name?");

lastName = sc.nextLine(); // Accept lastName

System.out.println("What is the hour of your appointment?(1-31)");

hours = sc.nextInt(); // Accept hours

System.out.println("What is the minutes of your appointment?(1-31)");

minutes = sc.nextInt(); // Accept minutes

/* calling methods*/

daily.setDescription(description);

daily.setHours(hours);

daily.setLastName(lastName);

daily.setMinutes(minutes);

System.out.println("Appointment added with "+lastName+" Daily at "+hours+":"+minutes); // print appointment holder details

System.out.println();

return daily;

case 3:

Monthly monthly = new Monthly();

System.out.println("What is the description of your appointment?");

description = sc.nextLine(); // Accept description

System.out.println("What is your person's name?");

lastName = sc.nextLine(); // Accept lastName

System.out.println("What day of the month is your appointment?(1-12)");

day = sc.nextInt(); // Accept day

System.out.println("What is the hour of your appointment?(1-31)");

hours = sc.nextInt(); // Accept hours

System.out.println("What is the minutes of your appointment?(1-31)");

minutes = sc.nextInt(); // Accept minutes

/* calling methods*/

monthly.setDescription(description);

monthly.setHours(hours);

monthly.setLastName(lastName);

monthly.setMinutes(minutes);

monthly.setDay(day);

System.out.println("Appointment added with "+lastName+" Monthly on day "+day+" at "+hours+":"+minutes);

// print appointment holder details

System.out.println();

return monthly;

default:

System.out.println("Invalid Choice..!!");

return app;

}

}

public static boolean checkAppointment(Appointment a, int year, int month, int day) { // calling method to check appointments

return a.occursOn(year, month, day); // pass details

}

}