Javaでコレクションをフィルタリングする方法

public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
    Predicate<Integer> streamsPredicate = item -> item % 2 == 0;

    return baseCollection.stream()
      .filter(streamsPredicate)
      .collect(Collectors.toList());
}

public Map<Integer, List<Integer>> findEvenNumbersAfterGrouping(
  Collection<Integer> baseCollection) {

    Function<Integer, Integer> getQuantityOfDigits = item -> (int) Math.log10(item) + 1;

    return baseCollection.stream()
      .collect(groupingBy(
        getQuantityOfDigits,
        filtering(item -> item % 2 == 0, toList())));
}

<dependency>
    <groupId>org.eclipse.collections</groupId>
    <artifactId>eclipse-collections</artifactId>
    <version>9.2.0</version>
</dependency>

public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
    Predicate<Integer> eclipsePredicate
      = item -> item % 2 == 0;

    Collection<Integer> filteredList = Lists.mutable
      .ofAll(baseCollection)
      .select(eclipsePredicate);

    return filteredList;
}

Collection<Integer> filteredList
 = Iterate.select(baseCollection, eclipsePredicate);

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-collections4</artifactId>
    <version>4.2</version>
</dependency>

public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
    Predicate<Integer> apachePredicate = item -> item % 2 == 0;

    CollectionUtils.filter(baseCollection, apachePredicate);
    return baseCollection;
}

<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>25.1-jre</version>
</dependency>

public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
    Predicate<Integer> guavaPredicate = item -> item % 2 == 0;

    return Collections2.filter(baseCollection, guavaPredicate);
}