question: private static String typesString ( Class [ ] types ) { StringBuffer sb = new StringBuffer ( ) ; sb . append ( '(' ) ; for ( int i = 0 ; i < types . length ; i ++ ) { if ( i != 0 ) { sb . append ( ", " ) ; } sb . append ( Utilities . typeString ( types [ i ] ) ) ; } sb . append ( ')' ) ; return sb . toString ( ) ; }
target:  Returns a String describing the types in an argument list.