I have a problem with conversion List Object to Map String, List Object. I'm looking for Map with a keys name of all components in cars, and a value is represented by cars with this component
public class Car {
private String model;
private List<String> components;
// getters and setters
}
I write a solution but looking for a better stream solution.
public Map<String, List<Car>> componentsInCar() {
HashSet<String> components = new HashSet<>();
cars.stream().forEach(x -> x.getComponents().stream().forEachOrdered(components::add));
Map<String, List<Car>> mapCarsComponents = new HashMap<>();
for (String keys : components) {
mapCarsComponents.put(keys,
cars.stream().filter(c -> c.getComponents().contains(keys)).collect(Collectors.toList()));
}
return mapCarsComponents;
}