Работа с Map Java 8

Map<Boolean, List<Car>> carsByPicked = new HashMap<>();
 
Map<String, List<Car>> carsByBrand = new HashMap<>();
 
List<Car> carsToRemove = carsByPicked.get(true);
 
List<String> brands = new ArrayList<String>(carsByBrand.keySet());
 
keys.forEach(brand -> carsByBrand.computeIfPresent(brand,(brands, cars) -> 
cars.removeIf(car -> carsToRemove.contains(car) || cars.size() == 0) ? null : cars)); 
 
carsByBrand.replaceAll((brand, cars) -> {cars.removeAll(carsToRemove); return cars;});

        final Map<Key, List<Value>> filtered = map.entrySet().stream()
                .filter(entry -> !entry.getValue().isEmpty())
                .collect(Collectors.toMap(entry -> entry.getKey(), entry -> entry.getValue()));

        map.entrySet().removeIf(entry -> entry.getValue().isEmpty());

map.replaceAll((key, val) -> getUpdatedListFor(key)); // где getUpdatedListFor BiFunction