public synchronized void save() {
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(new File(path));
            this.prop.store(fos, Calendar.getInstance().toString());
            fos.flush();

        } catch (FileNotFoundException e) {
            Logger.error(e.getMessage(), e);
        } catch (IOException e) {
            Logger.error(e.getMessage(), e);
        } finally {
            if (fos != null)
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
        }
    }