question: @ NotNull public QueryBuilder appendPlaceholders ( int count ) { if ( count <= 0 ) throw new IllegalArgumentException ( "count must be positive, but was: " + count ) ; query . append ( '?' ) ; for ( int i = 1 ; i < count ; i ++ ) query . append ( ",?" ) ; return this ; }
target:  Adds a given amount of comma-separated place-holders. The amount must be at last 1.