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I want to filter a java.util.Collection based on a predicate.

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You can solve this problem using stream and lambdaj one-liner codes:

Using Streams:

In all the events, we’ll have to define this condition as a Predicate object:

public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {

    Predicate<Integer> streamsPredicate = item -> item % 2 == 0;

    return baseCollection.stream()





Using Lambdaj:

lambdaj allows filtering collections without writing loops or inner classes:

List<Person> beerDrinkers = select(persons, having(on(Person.class).getAge(),


Happy Learning….!!

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