Method getFileExtension

corpus/java/training/guava/io/Files.java:754–759

Returns the file extension for the given file name, or the empty string if the file has no extension. The result does not include the '.'. @since 11.0

(String fullName)

   * @since 11.0
   */
  public static String getFileExtension(String fullName) {
    checkNotNull(fullName);
    String fileName = new File(fullName).getName();
    int dotIndex = fileName.lastIndexOf('.');
    return (dotIndex == -1) ? "" : fileName.substring(dotIndex + 1);
  }

  /**
   * Returns the file name without its