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import java.util.Calendar;
import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class AlarmClock {

    public static void main(String[] args) {
        ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);

        Calendar alarmTime = Calendar.getInstance();
        alarmTime.set(Calendar.HOUR_OF_DAY, 8);
        alarmTime.set(Calendar.MINUTE, 0);
        alarmTime.set(Calendar.SECOND, 0);

        long initialDelay = alarmTime.getTimeInMillis() - System.currentTimeMillis();
        if (initialDelay < 0) {
            initialDelay += 24 * 60 * 60 * 1000; // If the alarm time is in the past, add a day
        }

        scheduler.scheduleAtFixedRate(() -> {
            System.out.println("Wake up! It's time to get up!");
        }, initialDelay, 24 * 60 * 60 * 1000, TimeUnit.MILLISECONDS);
    }
}

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