Method getExtension

src/org/opensourcephysics/controls/XML.java:249–259

Gets the extension of the specified file name. @param fileName the file name with or without path @return the extension, or null if none

(String fileName)

   * @return the extension, or null if none
   */
  public static String getExtension(String fileName) {
    if(fileName==null) {
      return null;
    }
    int i = fileName.lastIndexOf('.');
    int j = forwardSlash(fileName).lastIndexOf('/');
    if(i>0 && i<fileName.length()-1 && i>j) {
      return fileName.substring(i+1);
    }
    return null;
  }

  /**
   * Gets a simple class name for the specified class type.