private class Abecadlo implements Runnable {

        @Override
        public void run() {
            while (true) {
                //for (int i = 0; 10 < i; i++) {
                    System.out.println("Size of array: " + stringToShow);
                    stringsToShow.add(response);
               // }
            }
        }
    }

    public void setStringToShow(String stringToShow) {

        this.response = stringToShow;

        displayText.setText(response);
        System.out.println("GUI says: " + stringToShow + "\n");
    }