How to awake a Thread every second, Java

Question

I'm trying to launch a thread that needs to execute a task every second. So what I did from now is making a loop on this code:

// execute my task
..

lastScan.setTime(lastScan.getTime() + 1000);
long timeToSleep = (lastScan.getTime() - new Date().getTime());
try {
    Thread.sleep(timeToSleep);
} catch (InterruptedException e) {
    e.printStackTrace();
}

This works, but I was wondering if there is something more elegant, and maybe more safe, for example a function that awake my thread when the current Date reach a given time.

Thanks in advance for your suggestions.

Answer 1

Try using ScheduledExecutorService :

ScheduledExecutorService es = Executors.newScheduledThreadPool(10); //number of threads

From there, the class has different methods for passing Runnable objects for which you can run on a timed delay in a separate thread

Answer 2

I would go with :

 ScheduledThreadPoolExecutor

Scheduled Pool

Answer 3

看一下Java Timer类，这将帮助您更优雅地进行定时循环。

Answer 4

You can use Timer and TimerTask, This is a sample code that prints the same line every 5 seconds

import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;

public class TimeReminder {
    Timer timer;

    public TimeReminder(int seconds) {
        timer = new Timer(); //At this line a new Thread will be created
        timer.schedule(new RemindTask(), Calendar.getInstance().getTime(), seconds * 1000);
    }

    class RemindTask extends TimerTask {

        @Override
        public void run() {
            System.out.println("ReminderTask is completed by Java timer");
        }
    }

    public static void main(String args[]) {

        new TimeReminder(5);
        System.out.println("Timertask is scheduled with Java timer.");
    }
}