code: public static String getIndexedFormat(int index, String format) {
  		if (index < 1)
  			throw new IllegalArgumentException();
  		if (format == null)
  			throw new NullPointerException();
  		if (format.length() == 0)
  			throw new IllegalArgumentException();
  		return String.format(INDEXED_FORMAT, index, format);
  	}
docs: Returns an indexed format by placing the specified index before the given
  format.
  
  @param index
  Desired index for the given format
  @param format
  Format to be indexed
  @return The format <code>format</code> indexed with <code>index</code>