Java Loop every minute

Question

I want to write a loop in Java that firs starts up and goes like this   while   x         wait one minute or two        execute code     I want to do this so that it does not use up system resources   What is actually going on in the code is that it goes to a website and checks to see if something is done  if it is not done  it should wait another minute until it checks again  and when its done it just moves on   Is their anyway to do this in java

User · Answer

If you are using a SpringBoot application it's as simple as

ScheduledProcess

@Log
@Component
public class ScheduledProcess {

    @Scheduled(fixedRate = 5000)
    public void run() {
        log.info("this runs every 5 seconds..");
    }

}

Application.class

@SpringBootApplication
// ADD THIS ANNOTATION TO YOUR APPLICATION CLASS
@EnableScheduling
public class SchedulingTasksApplication {

    public static void main(String[] args) {
        SpringApplication.run(SchedulingTasksApplication.class);
    }
}

User · Answer

ScheduledExecutorService executor   Executors newScheduledThreadPool 1   executor schedule yourRunnable  1L  TimeUnit MINUTES          when done    executor shutdown

User · Answer

ScheduledExecutorService  The Answer by Lee is close  but only runs once  The Question seems to be asking to run indefinitely until an external state changes  until the response from a web site service changes    The ScheduledExecutorService interface is part of the java util concurrent package built into Java 5 and later as a more modern replacement for the old Timer class   Here is a complete example  Call either scheduleAtFixedRate or scheduleWithFixedDelay   ScheduledExecutorService executor   Executors newScheduledThreadPool   1     Runnable r   new Runnable           Override     public void run              try       Always wrap your Runnable with a try-catch as any uncaught Exception causes the ScheduledExecutorService to silently terminate              System out println    Now      Instant now           Our task at hand in this example  Capturing the current moment in UTC              if   Boolean FALSE         Add your Boolean test here to see if the external task is fonud to be completed  as described in this Question                  executor shutdown          shutdown  politely asks ScheduledExecutorService to terminate after previously submitted tasks are executed                           catch   Exception e                 System out println    Oops  uncaught Exception surfaced at Runnable in ScheduledExecutorService                          try       executor scheduleAtFixedRate   r   0L   5L   TimeUnit SECONDS         runnable   initialDelay   period   TimeUnit       Thread sleep   TimeUnit MINUTES toMillis   1L         Let things run a minute to witness the background thread working    catch   InterruptedException ex         Logger getLogger   App class getName      log   Level SEVERE   null   ex      finally       System out println    ScheduledExecutorService expiring  Politely asking ScheduledExecutorService to terminate after previously submitted tasks are executed          executor shutdown         Expect output like this   Now  2016-12-27T02 52 14 951Z Now  2016-12-27T02 52 19 955Z Now  2016-12-27T02 52 24 951Z Now  2016-12-27T02 52 29 951Z Now  2016-12-27T02 52 34 953Z Now  2016-12-27T02 52 39 952Z Now  2016-12-27T02 52 44 951Z Now  2016-12-27T02 52 49 953Z Now  2016-12-27T02 52 54 953Z Now  2016-12-27T02 52 59 951Z Now  2016-12-27T02 53 04 952Z Now  2016-12-27T02 53 09 951Z ScheduledExecutorService expiring  Politely asking ScheduledExecutorService to terminate after previously submitted tasks are executed  Now  2016-12-27T02 53 14 951Z

User · Answer

You can use Timer  Timer timer   new Timer     timer schedule  new TimerTask         public void run               do your work            0  60 1000     When the times comes    timer cancel      To shut it down

User · Answer

Use Thread sleep long millis       Causes the currently executing thread to sleep  temporarily cease execution  for the specified number of milliseconds  subject to the precision and accuracy of system timers and schedulers  The thread does not lose ownership of any monitors     One minute would be  60 1000    60000 milliseconds     For example  this loop will print the current time once every 5 seconds       try           while  true                System out println new Date                 Thread sleep 5   1000                   catch  InterruptedException e            e printStackTrace            If your sleep period becomes too large for int  explicitly compute in long  e g  1000L

[java] Java Loop every minute

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