question: instantiate specified class , either alias or fully-qualified class name . concode_field_sep PlaceHolder placeHolder concode_field_sep Class<? extends Builder> lookup
target: Builder function ( String arg0 ) { Class < ? extends Builder > loc0 = lookup ( arg0 ) ; if ( loc0 == null ) { loc0 = ( Class < ? extends Builder > ) Class . forName ( arg0 ) ; } return loc0 . newInstance ( ) ; }