My First Full-Fledged Project

This project helps people find overlapping free time in their schedules.

🕒 How It Works:

  1. Enter your availability for a given day (e.g., 4-6pm and 8-10pm).
  2. Enter a second person’s availability (e.g., 5-9pm).
  3. The program prints a time spreadsheet and calculates when everyone is available.
  4. Works for up to four people at once.

🔧 Workings & Caveats:

  • Utilized a 2-D Array to process user-provided schedules.
  • Handling AM/PM time conversions (especially 10, 11, and 12) was challenging.
  • Coded entirely inside a JVM.

📽 Demo Video:

Unfortunately, the source code was lost due to it being stored on my school’s virtual machine.
However, a sample run of the program was recorded:

🔗 Watch on YouTube

Recreation:

Here’s a recreation by ChatGPT (which negates the advanced user experience that I had crafted):

import java.util.*;

public class FreeTimeCalculator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        boolean[] timeSlots = new boolean[24]; // each hour of the day

        Arrays.fill(timeSlots, true); // Start with all available

        for (int person = 1; person <= 4; person++) {
            System.out.println("Enter availability for Person " + person + " (e.g., 4-6,8-10 or 'x' to skip): ");
            String input = scanner.nextLine();
            if (input.equalsIgnoreCase("x")) break;

            boolean[] personSlots = new boolean[24];
            Arrays.fill(personSlots, false);

            String[] ranges = input.split(",");
            for (String range : ranges) {
                String[] hours = range.split("-");
                int start = Integer.parseInt(hours[0].trim());
                int end = Integer.parseInt(hours[1].trim());
                for (int i = start; i < end; i++) {
                    personSlots[i] = true;
                }
            }

            for (int i = 0; i < 24; i++) {
                timeSlots[i] = timeSlots[i] && personSlots[i];
            }
        }

        System.out.println("\nShared Free Time:");
        boolean found = false;
        for (int i = 0; i < 24; i++) {
            if (timeSlots[i]) {
                System.out.print(i + ":00 ");
                found = true;
            }
        }
        if (!found) {
            System.out.println("No common availability.");
        }
    }
}