loops - Resuming a Java program when the computer sleeps? -

i have java program has loop in checks new messages every twenty seconds.

example:

while (true) {     thread.sleep(20000);     newmessages(); } 

this works when computer being run. however, if user put computer sleep , wake duration of time later, whole program gets messed , no longer checks messages every twenty seconds. there way correct this?

instead of using thread.sleep can use timer.

a facility threads schedule tasks future execution in background thread. tasks may scheduled one-time execution, or repeated execution @ regular intervals.

your code might be:

final timer timer = new timer(); final timertask task = new timertask() {             @override     public void run() {         newmessages();     } };       timer.scheduleatfixedrate(task, new date(), 20000); 

timer javadoc