question: public static String toTypeString ( Object [ ] arguments , int maxSize ) { if ( arguments == null ) { return "null" ; } StringBuilder argBuf = new StringBuilder ( ) ; for ( int i = 0 ; i < arguments . length ; i ++ ) { if ( maxSize != - 1 && argBuf . length ( ) > maxSize ) { argBuf . append ( "..." ) ; break ; } else { if ( i > 0 ) { argBuf . append ( ", " ) ; } argBuf . append ( arguments [ i ] != null ? typeName ( arguments [ i ] ) : "null" ) ; } } return argBuf . toString ( ) ; }
target:  A helper method to format the arguments types as a comma-separated list.