wait - How to delay in Java? -

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• i exception when using thread.sleep(x) or wait() 11 answers

i trying in java , need wait / delay amount of seconds in while loop.

while (true) {     if (i == 3) {         = 0;     }      ceva[i].setselected(true);     //need wait here     ceva[i].setselected(false);     //need wait here     i++; } 

i want build step sequencer , i'm new java. suggestions ? thanks!

if want pause use java.util.concurrent.timeunit:

timeunit.seconds.sleep(1); 

to sleep 1 second or

timeunit.minutes.sleep(1); 

to sleep minute.

as loop, presents inherent problem - drift. every time run code , sleep drifting little bit running, say, every second. if issue don't use sleep.

further, sleep isn't flexible when comes control.

for running task every second or @ 1 second delay strongly recommend scheduledexecutorservice , either scheduleatfixedrate or schedulewithfixeddelay.

for example, run method mytask every second (java 8):

public static void main(string[] args) {     final scheduledexecutorservice executorservice = executors.newsinglethreadscheduledexecutor();     executorservice.scheduleatfixedrate(app::mytask, 0, 1, timeunit.seconds); }  private static void mytask() {     system.out.println("running"); } 

and in java 7:

public static void main(string[] args) {     final scheduledexecutorservice executorservice = executors.newsinglethreadscheduledexecutor();     executorservice.scheduleatfixedrate(new runnable() {         @override         public void run() {             mytask();         }     }, 0, 1, timeunit.seconds); }  private static void mytask() {     system.out.println("running"); }