final JTextField field;
public void onButtonClick() {
    Thread thread = new Thread(new Runnable() {
        @Override
        public void run() {
            //__IO OPERAISHN__
            field.setText("ALLO YOBA");
            //__IO OPERAISHN__
            field.setText("ETO TI?");
            //__IO OPERAISHN__
            field.setText("PSShhh");
        }
    });
    thread.start();
}