private void getAllowedIds(String stringFromFile) {
    try {
        String [] tempArray = stringFromFile.split(",");
        for (int i = 0; i < tempArray.length; i++) {
            allowedIds.add(Integer.parseInt(tempArray[i]));
        }
    }catch (NumberFormatException e) {
        System.out.println("The string contained non-integers.");
        e.printStackTrace();
    }catch (Exception n) {
        //for catching any other exceptions
        n.printStackTrace();
    }
}