public EncoderTestSuiteBuilder encoded(String chars){
  for (int i=0, n=chars.length(); i < n; ++i) {
    char ch=chars.charAt(i);
    _encoded.set(ch);
    _valid.clear(ch);
    _invalid.clear(ch);
  }
  return this;
}

public EncoderTestSuiteBuilder encoded ( String chars ) { for ( int i = 0 , n = chars . length ( ) ; i < n ; ++ i ) { char ch = chars . charAt ( i ) ; _encoded . set ( ch ) ; _valid . clear ( ch ) ; _invalid . clear ( ch ) ; } return this ; }
tells the builder that a set of characters is encoded .
