public final ByteArrayBuilder append(String string,Charset charset) throws UnsupportedEncodingException {
  return append(string.getBytes(charset.name()));
}

public final ByteArrayBuilder append ( String string , Charset charset ) throws UnsupportedEncodingException { return append ( string . getBytes ( charset . name ( ) ) ) ; }
convenience method for append ( byte [ ] ) combined with a stringbuffer of specified charset
