public void WriteAFile(File filename) {
        try {
            BufferedWriter writer = new BufferedWriter(new FileWriter(filename));
            Scanner sc = new Scanner(System.in);
            String input, content;
            while (sc.hasNext()) {
                input = sc.next();
                if (input.equalsIgnoreCase("exit")) {
                    System.out.println("üres bevitel!");
                    break;
                }
                writer.write(input);
                writer.newLine();
            }
            writer.close();
        } catch (IOException ex) {
            System.out.println("Van baj!");
        }
    }
}