Tracking

public class File extends Thread {

    ArrayList<String> example;
    String name;

    File(String name) {
        this.name = name;
        this.example = new ArrayList<String>();
        this.setDaemon(true);
    }

    public static ArrayList<String> readFile(String name) throws FileNotFoundException {
        Scanner scanner = null;
        scanner = new Scanner(new BufferedReader(new FileReader(name)));
        ArrayList<String> fileList = new ArrayList<String>();
        while (scanner.hasNextLine()) {
            fileList.add(scanner.nextLine());
        }
        scanner.close();
        return fileList;
    }

    public void observeFiles() throws FileNotFoundException, InterruptedException {
        ArrayList<String> baseFile;
        ArrayList<String> observableFile;
        boolean b = true;
        while (b) {
            baseFile = File.readFile(name);
            Thread.sleep(5000);
            observableFile = File.readFile(name);
            if (!baseFile.equals(observableFile)) {

                System.out.println(
                        "File has been changed. Do you want to send a message by e-mail? Enter 1 to send a message or 2 to continue tracking");
                boolean c = true;
                while (c) {
                    try {
                        Scanner scanner = new Scanner(System.in);
                        int input = scanner.nextInt();
                        switch (input) {
                        case 1:
                            System.out.println("Enter adress");
                            String adress = scanner.nextLine();
                            MailSender mailsender = new MailSender();
                            mailsender.setProperties();
                            mailsender.sendMessage(adress);
                            return;
                        case 2:
                            return;
                        default:
                            System.out.print("Wrong input!" + "\n");

                            break;
                        }
                    } catch (InputMismatchException ex) {
                        System.out.print("Wrong input!");

                    }
                }
            } else {
                System.out.println("There are no changes in the file " + name);
            }
            baseFile.clear();
            baseFile.addAll(observableFile);
        }
    }

    public void run() {
        try {
            this.observeFiles();
        } catch (FileNotFoundException ex) {
            System.out.print("There are no files with such name!");
            return;
        } catch (InterruptedException ex) {
            System.out.print("Tracking has been stopped");
            return;
        }
    }

}

    public static void main(String[] args) {

        Menu menu = new Menu();
        Scanner sc = new Scanner(System.in);

        menu.addEntry(new MenuEntry("Start tracking file") {
            @Override
            public void run() {
                System.out.print("Enter the file name" + "\n");
                String entry = sc.nextLine();
                File file = new File(entry);
                file.start();
            }
        });

        menu.addEntry(new MenuEntry("Stop tracking file") {
            @Override
            public void run() {
            }
        });
        menu.run();
        sc.close();

    }
}