I've got a class
class A {
int a=0;
public int getVal() {
return a;
}
}
and I've to execute the function getVal periodically. How do I do it from another class b? Thanks.
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I'm writing a simple program in Java and not using Swing. So,, is there anyway to call getVal() without putting it inside run() or using the run() at all? Thanks again.P R– P R2011-09-28 18:26:26 +00:00Commented Sep 28, 2011 at 18:26
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4 Answers
Old Way
New (and preferred) Way
java.util.concurrent.Executors
Implementation
More specifically, use the ScheduledExecutorService class.
Comments
Various potential problems with java.util.Timer are listed in section 6.2.5 of "Java Concurrency in Practice." For example:
Timerbehaves poorly if aTimerTasktakes too long to run.Timerbehaves poorly if aTimerTaskthrows an unchecked exception.
The authors of that book concluded that "there is little reason to use Timer in Java 5.0 or later."
Instead, they recommend using a ScheduledExecutorService. You can construct one either via the ScheduledThreadPoolExecutor constructor or via the newScheduledThreadPool factory methods in Executors. The later option is better.
Comments
Check out the Timer class.
http://download.oracle.com/javase/1.4.2/docs/api/java/util/Timer.html
1 Comment
Guillaume
It always worked well for me, but there's also the more "modern" API ScheduledExecutorService and ScheduledFuture, which does the trick as well.
Simply just give a look on Threads in java. you can make this class runnable, and execute the function periodically, and the delay can be generated using the sleep() function. Otherwise you can make the calling function runnable.
