AtomicInteger

/**
     * @param args
     */
    public static void main(String[] args) {
        final AtomicInteger TotalMapedFiles = new AtomicInteger(0);
        System.out.println(TotalMapedFiles);
        System.out.println(TotalMapedFiles.incrementAndGet());
        System.out.println(TotalMapedFiles);

    }

0
1
1