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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7.     import java.time.ZoneId;
  8.     import java.time.ZonedDateTime;
  9.     import java.time.format.DateTimeFormatter;
  10.     import java.time.format.FormatStyle;
  11.     import java.util.Locale;
  12.     import java.util.concurrent.Executors;
  13.     import java.util.concurrent.ScheduledExecutorService;
  14.     import java.util.concurrent.ScheduledFuture;
  15.     import java.util.concurrent.TimeUnit;
  16.  
  17. /* Name of the class has to be "Main" only if the class is public. */
  18. class Ideone
  19. {
  20.  
  21.  
  22.  public static void main ( String[] args ) {
  23.             Ideone app = new Ideone ();
  24.             app.doIt ();
  25.         }
  26.  
  27.         private void doIt () {
  28.             System.out.println ( "INFO - Ideone::doIt - Running." );
  29.             BeeperControl bc = new BeeperControl ();
  30.             bc.beepRegularly ();  // Ask that object to launch the background thread to tell time repeatedly.
  31.             try {
  32.                 Thread.sleep ( TimeUnit.MINUTES.toMillis ( 5 ) ); // Run for five minutes and then shutdown this main thread and the background thread too.
  33.                 bc.halt ();  // Ask that object to stop the background thread.
  34.             } catch ( InterruptedException ex ) { // This main thread is either being woken-from-sleep or stopped.
  35.                 System.out.println ( "INFO - Ideone::doIt - main thread of Ideone app interrupted." );
  36.                 bc.halt ();  // Ask that object to stop the background thread.
  37.             }
  38.         }
  39.  
  40.         class BeeperControl {
  41.  
  42.             private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool ( 1 );
  43.             private final ZoneId zoneId = ZoneId.of ( "America/Montreal" );
  44.             private final Locale locale = Locale.CANADA_FRENCH;
  45.             //private final DateTimeFormatter formatter = DateTimeFormatter.ofLocalizedDateTime ( FormatStyle.MEDIUM ).withLocale ( this.locale );
  46.             private final DateTimeFormatter formatter = DateTimeFormatter.ofPattern ( "hh:mm:ss a" , this.locale );
  47.  
  48.             public void beepRegularly () {
  49.                 // Define task to be performed.
  50.                 final Runnable beeper = new Runnable () {
  51.                     public void run () {
  52.                         try {
  53.                             ZonedDateTime zdt = ZonedDateTime.now ( zoneId );
  54.                             System.out.println ( "Now: " + zdt.format ( formatter ) );
  55.                         } catch ( Exception e ) {
  56.                             // Always surround your task code with a try-catch, as any uncaught exception causes the scheduler to cease silently.
  57.                             System.out.println ( "Exception unexpectedly reached 'run' method. " + e.getLocalizedMessage () );
  58.                         }
  59.                     }
  60.                 };
  61.                 // Start performing that task every so often.
  62.                 System.out.println ( "INFO - BeeperControl::beepRegularly - Scheduling the executor service to run now. Runs indefinitely." );
  63.                 final ScheduledFuture<?> beeperHandle = scheduler.scheduleAtFixedRate ( beeper , 0 , 5 , TimeUnit.SECONDS ); // (Runnable command, long initialDelay, long period, TimeUnit unit)
  64.             }
  65.  
  66.             public void halt () {
  67.                 System.out.println ( "INFO - BeeperControl::halt - shutting down the ScheduledExecutorService." );
  68.                 scheduler.shutdown ();  // Initiates an orderly shutdown in which previously submitted tasks are executed, but no new tasks will be accepted.
  69.                 // scheduler.shutdownNow(); // Attempts to stop all actively executing tasks, halts the processing of waiting tasks, and returns a list of the tasks that were awaiting execution.
  70.             }
  71.         }
  72.  
  73. }
Time limit exceeded #stdin #stdout 5s 1106432KB
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INFO - Ideone::doIt - Running.
INFO - BeeperControl::beepRegularly - Scheduling the executor service to run now. Runs indefinitely.
Now: 04:27:40 AM
Now: 04:27:45 AM
Now: 04:27:50 AM
https://ideone.com/lGBdt6
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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