CODEWITHSUNDEEP
javajava-stream
Georgi Michev
Georgi Michev

Reputation: 894

Filter internal list of objects in a stream of List

I have List of Person objects

public class Person {
    private String name;
    private List<Animal> animals;
}

Which have list of animal objects:

public class Animal {
    private String name;
}

I am trying to create a new list out of it and I am trying to extract only those Person who have a specific name

List<Person> filteredPeople = people.stream()
                .filter(e -> e.getName().equals("John")).collect(Collectors.toList());

Is it possible to add one more filter and how do I access the Animal list inside the person so I can filter by the animal name - for example if any the Animals(inside Person) name is "Lucky" to also put this Person object inside the new list?

Looks like this is not a valid idea:

.filter(e -> e.getAnimals().stream().filter(f -> f.getName().equals("lucky")))

Upvotes: 0

Views: 613

Answers (1)

Saurabh Chaudhari
Saurabh Chaudhari

Reputation: 76

You can achieve this by

persons.stream()
    .filter(p -> p.getName.equals("John") || p.getAnimals().stream().anyMatch(a -> a.getName.equals("lucky")))
    .collect(Collectors.toList())

Upvotes: 1

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