ScheduledThreadPoolExecutor with one scheduled task(Runnable) keeps reporting back job counter + 1 all the time

Question

I get an ever increasing(like 1,2,3,4,5,6,7...) task count when I print s.getTaskCount(). I don't understand why.

public class MyTask implements Runnable
{
    public void run()
    {
       System.out.println("whatever....");
    }
 }


ScheduledThreadPoolExecutor s = new ScheduledThreadPoolExecutor(3);
s.scheduleAtFixedRate(new MyTask(), 0, 10, TimeUnit.SECONDS);


while(1>0)
{
    try
    {
        System.out.println("TASK COUNT: "+s.getTaskCount());
        Thread.sleep(60000);
    }
    catch(InterruptedException e)
    {
        System.out.println(e);
    }
}

Answer 1

ScheduledThreadPoolExecutor.getTaskCount() states in the documentation:

Returns the approximate total number of tasks that have been scheduled for execution. Because the states of tasks and threads may change dynamically during computation, the returned value is only an approximation, but one that does not ever decrease across successive calls

So, getTaskCount() returns the total number of tasks that have been executed by the pool.

I'm not sure what your goal is, but if you want the number of tasks currently being executed, try getActiveCount().