Question

for this; i want the “Continuous” button to start rollthedice(), and the “Stop” button to stop it, but then when i hit the “Continuous” button again i want it to start rollthedice() again, back and forth

scheduler = new ScheduledThreadPoolExecutor(1);

ScheduledFuture now = null;

Runnable runner = new Runnable(){
    public void run()
    {
        rollthedice();
    }
};


if(e.getSource()==continuous)
{

    now = scheduler.scheduleAtFixedRate(runner, 0, 500, TimeUnit.MILLISECONDS);
}
if(e.getSource()==stop)
{

    now.cancel(true);

}

Answer 1

what you are missing is this Assignment to ScheduledFuture now

now = scheduler.scheduleAtFixedRate(runner, 0, 500,
                TimeUnit.MILLISECONDS);

Then you can call now.cancel(true);

Just move below declarations at class level i.e. you can move above your actionPerformed method. It works fine after that.

ScheduledThreadPoolExecutor scheduler = new ScheduledThreadPoolExecutor(1);
ScheduledFuture<?> now = null;