question: public static < T > String joinAnd ( final String delimiter , final String lastDelimiter , final Collection < T > objs ) { if ( objs == null || objs . isEmpty ( ) ) return "" ; final Iterator < T > iter = objs . iterator ( ) ; final StringBuilder buffer = new StringBuilder ( ) ; while ( iter . hasNext ( ) ) { final T obj = iter . next ( ) ; if ( notEmpty ( obj ) ) { if ( buffer . length ( ) != 0 ) { buffer . append ( iter . hasNext ( ) ? delimiter : lastDelimiter ) ; } buffer . append ( Strings . toString ( obj ) ) ; } } return buffer . toString ( ) ; }
target:  Like join, but allows for a distinct final delimiter. For english sentences such as "Alice, Bob and Charlie" use ", " and " and " as the delimiters.