public static List<String> readLines(String dateiname) {
        List<String> result = new ArrayList<>();
        File file = new File(dateiname);
        try (FileReader fileReader = new FileReader(file); BufferedReader bufferedReader = new BufferedReader(fileReader);) {
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                result.add(line);
            }
        } catch (FileNotFoundException fnfEx) {
            fnfEx.printStackTrace(System.err);
        } catch (IOException ioEx) {
            ioEx.printStackTrace(System.err);
        } finally {
            return result;
        }
    }