Return readable file size with selected value measure

  

/**
 * Methods for files and folders treatment.
 * 
 * @author Cyril JOUI
 */
public final class FileUtil {
  /**
   * @param fileSize
   *          file size to convert and format to string.
   * @return return readable file size with selected value measure
   */
  public static String getReadableFileSize(final long fileSize) {
    double l = fileSize * 1D;
    String s = "";
    if (l < 1000) {
      s = fileSize + " B";
    } else {
      l = l / 1024D;
      if (l < 1000) {
        s = l + " KB";
      } else {
        l = l / 1024D;
        if (l < 1000) {
          s = l + " MB";
        } else {
          l = l / 1024D;
          s = l + " GB";
        }
      }
    }
    return (s.length() - s.indexOf('.') <= 3 ? s : s.substring(0, s.indexOf('.') + 3))
        + s.substring(s.indexOf(" "), s.length());
  }

}

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Return readable file size with selected value measure : File Commands « File Input Output « Java

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