AlarmClock.java

import java.io.File;
import java.io.IOException;
import java.time.LocalTime;
import java.util.Scanner;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;

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();

                int hours = now.getHour();
                int minutes = now.getMinute();
                int seconds = now.getSecond();

                System.out.printf("\r%02d:%02d:%02d", hours, minutes, seconds);
            } 
            catch (InterruptedException e) {
                System.out.println("Thread was interrupted");
            }
        }
        System.out.println("\nALARM RINGING");
        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");
        }
    }
}