Let's code an alarm clock with Java! ⏰

#java #javatutorial #javacourse This is a beginner's project to help us learn and understand Object Oriented Programming and Threading. We will only be using topics we have discussed in past videos in this series. import java.time.LocalTime; import java.time.format.DateTimeFormatter; import java.time.format.DateTimeParseException; import java.util.Scanner; public class Main { public static void main(String[] args) { // JAVA ALARM CLOCK Scanner scanner = new Scanner(System.in); DateTimeFormatter formatter = DateTimeFormatter.ofPattern("HH:mm:ss"); LocalTime alarmTime = null; String filePath = "A Caring Friend.wav"; while(alarmTime == null){ try{ System.out.print("Enter an alarm time (HH:MM:SS): "); String inputTime = scanner.nextLine(); alarmTime = LocalTime.parse(inputTime, formatter); System.out.println("Alarm set for " + alarmTime); } catch(DateTimeParseException e){ System.out.println("Invalid format. Please use HH:MM:SS"); } } AlarmClock alarmClock = new AlarmClock(alarmTime, filePath, scanner); Thread alarmThread = new Thread(alarmClock); alarmThread.start(); } } import javax.sound.sampled.*; import java.awt.*; import java.io.File; import java.io.IOException; import java.time.LocalTime; import java.util.Scanner; public class AlarmClock implements Runnable{ private final LocalTime alarmTime; private final String filePath; private final Scanner scanner; AlarmClock(LocalTime alarmTime, String filePath, Scanner scanner){ this.alarmTime = alarmTime; this.filePath = filePath; this.scanner = scanner; } @Override public void run(){ while(LocalTime.now().isBefore(alarmTime)){ try { Thread.sleep(1000); LocalTime now = LocalTime.now(); System.out.printf("\r%02d:%02d:%02d", now.getHour(), now.getMinute(), now.getSecond()); } catch (InterruptedException e) { System.out.println("Thread was interrupted"); } } System.out.println("\n*ALARM NOISES*"); playSound(filePath); } private void playSound(String filePath){ File audioFile = new File(filePath); try(AudioInputStream audioStream = AudioSystem.getAudioInputStream(audioFile)){ Clip clip = AudioSystem.getClip(); clip.open(audioStream); clip.start(); System.out.print("Press *Enter* to stop the alarm: "); scanner.nextLine(); clip.stop(); scanner.close(); } catch(UnsupportedAudioFileException e){ System.out.println("Audio file format is not supported"); } catch(LineUnavailableException e){ System.out.println("Audio is unavailable"); } catch(IOException e){ System.out.println("Error reading audio file"); } } }