PROGRAM CODE:

import java.util.Scanner;

public class BirthdayComparisonDemo
{
    public static void main(String[] args) 
    {
        // Create a Scanner object to read user input
        Scanner scanner = new Scanner(System.in);

        // Prompt for and read the birthdays of person 1 (month and day)
        System.out.println("Person 1 Birthday");
        System.out.print("Enter the month (1-12): ");
        int month1 = scanner.nextInt();
        System.out.print("Enter the day (1-31): ");
        int day1 = scanner.nextInt();

        // Prompt for and read the birthdays of person 2 (month and day)
        System.out.println("\nPerson 2 Birthday");
        System.out.print("Enter the month (1-12): ");
        int month2 = scanner.nextInt();
        System.out.print("Enter the day (1-31): ");
        int day2 = scanner.nextInt();

        // Prompt for and read today's date (month and day)
        System.out.println("\nToday's Date");
        System.out.print("Enter the month (1-12): ");
        int todayMonth = scanner.nextInt();
        System.out.print("Enter the day (1-31): ");
        int todayDay = scanner.nextInt();

        // Calculate the absolute day of the year for each date using the formula
        int absoluteDay1 = calculateAbsoluteDay(month1, day1);
        int absoluteDay2 = calculateAbsoluteDay(month2, day2);
        int todayAbsoluteDay = calculateAbsoluteDay(todayMonth, todayDay);

        // Calculate the number of days remaining until each person's birthday
        int daysRemaining1 = absoluteDay1 - todayAbsoluteDay;
        int daysRemaining2 = absoluteDay2 - todayAbsoluteDay;

        // Determine which birthday is sooner
        String soonerBirthday;
        if (daysRemaining1 < 0) 
        {
            soonerBirthday = "Person 1";
        } else if (daysRemaining2 < 0) 
        {
            soonerBirthday = "Person 2";
        } else if (daysRemaining1 == daysRemaining2)
        {
            soonerBirthday = "Both persons have birthdays on the same day.";
        } else 
        {
            soonerBirthday = (daysRemaining1 < daysRemaining2) ? "Person 1" : "Person 2";
        }

        // Output the results
        System.out.println("\nDays Remaining Until Birthdays:");
        System.out.println("Person 1: " + daysRemaining1);
        System.out.println("Person 2: " + daysRemaining2);
        System.out.println("Sooner Birthday: " + soonerBirthday);
    }

    // Method to calculate the absolute day of the year for a given date (month and day)
    private static int calculateAbsoluteDay(int month, int day) {
        int[] daysInMonth = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        int absoluteDay = 0;

        // Sum the days of the months preceding the given month
        for (int i = 1; i < month; i++) {
            absoluteDay += daysInMonth[i];
        }

        // Add the days of the given month
        absoluteDay += day;

        return absoluteDay;
    }
}

OUTPUT:

Person 1 Birthday
Enter the month (1-12): 4
Enter the day (1-31): 15

Person 2 Birthday
Enter the month (1-12): 3
Enter the day (1-31): 20

Today's Date
Enter the month (1-12): 3
Enter the day (1-31): 10

Days Remaining Until Birthdays:
Person 1: 36
Person 2: 10
Sooner Birthday: Person 2