Uploaded December 2024 | Updated September 2026, 1 week ago

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#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");
}
}
}