Java 8 stream groupingBy

Tell me how to convert:

Map<String, List<Pet>> pets = petList
            .stream()
            .collect(Collectors.groupingBy(Pet::getType));

In 

Map<String, PetsHouse>

Using stream? Or do I bother too much and decide without using streams?

PetHouse - it's just a kind of wrapper over the sheet

List<Pet> petList;
PetHouse house = new PetHouse(petList);
Author: JVic, 2018-01-10
Source

2 answers

Everything is solved:

Map<String, List<Pet>> pets = petList
        .stream()
        .collect(Collectors.groupingBy(
            Pet::getType,
            Collectors.collectingAndThen(Collectors.toList(), PetHouse::new)
        ));
 4
Author: Alex Chermenin, 2018-01-10 13:39:52 
Map<String, PetHouse> m = pets.entrySet().stream()
            .collect(Collectors.toMap(Entry::getKey, e -> new PetHouse(e.getValue())));
 5
Author: Nikolai, 2018-01-10 13:23:51