public DateTimeFormatterBuilder append(DateTimeFormatter formatter){
  Objects.requireNonNull(formatter,"formatter");
  appendInternal(formatter.toPrinterParser(false));
  return this;
}

public DateTimeFormatterBuilder append ( DateTimeFormatter formatter ) { Objects . requireNonNull ( formatter , "formatter" ) ; appendInternal ( formatter . toPrinterParser ( false ) ) ; return this ; }
appends all the elements of a formatter to the builder . < p > this method has the same effect as appending each of the constituent parts of the formatter directly to this builder .
