How to calculate number of files in a directory in java code examples

 private static int calNoOfFiles(String directoryPath)
    {
        String fileDelimiter= File.separator;
        File fd = new File(directoryPath);
        if(!fd.isFile())
        {
            String list[] = fd.list();
            for(int i = 0; i < list.length; i++)
            {
                String tempDirPath = directoryPath + fileDelimiter + list[i];
                debug(tempDirPath);
                File ftd = new File(tempDirPath);
                if(ftd.isFile())
                    noOfFiles++;
                if(ftd.isDirectory())
                    calNoOfFiles(tempDirPath);
            }

        }
        return noOfFiles;
    }