converting to ScheduledThreadPoolExecutor

java multithreading swing executorservice event-dispatch-thread

Replace

Timer timer = new Timer();

with

ScheduledExecutorService service = Executors.newSingleThreadScheduledExecutor();

and

class Task extends TimerTask

with

class Task implements Runnable

and

timer.scheduleAtFixedRate(new Task(), 0, 1000);

with

service.scheduleAtFixedRate(new Task(), 0, 1000, TimeUnit.MILLISECONDS);

BTW You should not be attempting to update the GUI on another thread. Instead you have to add a task to the Swing GUI Thread to perform the task

    SwingUtilities.invokeLater(new Runnable() {        @Override        public void run() {            textOut.setText("" + i++);        }    });

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