question: static Type [ ] mapKeyAndValueTypes ( Type context , Class < ? > contextRawType ) { if ( context == Properties . class ) return new Type [ ] { String . class , String . class } ; Type mapType = getSupertype ( context , contextRawType , Map . class ) ; if ( mapType instanceof ParameterizedType ) { ParameterizedType mapParameterizedType = ( ParameterizedType ) mapType ; return mapParameterizedType . getActualTypeArguments ( ) ; } return new Type [ ] { Object . class , Object . class } ; }
target:  Returns a two element array containing this map's key and value types in positions 0 and 1 respectively.