“Lista do mapy listy Java 8” Kod odpowiedzi

Lista do mapy listy Java 8

   Map<String,Set<String>> map =  list.stream().
           collect(Collectors.groupingBy(
                    Student::getName,
                    Collectors.mapping(e->getNum(e.getAddr()), Collectors.toSet())
                ));

   System.out.println("Map : "+map);