code: public static File createTempFile(final String ext) {
  		try {
  			File file;
  			file = File.createTempFile("jk-", "." + ext);
  			return file;
  		} catch (IOException e) {
  			JK.throww(e);
  			return null;
  		}
  	}
docs: Creates the temp file.
  
  @param ext the ext
  @return the file