How to apply multiple predicates to a java.util.Stream?

Question

How can I apply multiple predicates to a java.util.Stream\'s filter() method?

This is what I do now, but I don\'t really like it. I have a

Answer 1

I've managed to solve such a problem, if a user wants to apply a list of predicates in one filter operation, a list which can be dynamic and not given, that should be reduced into one predicate - like this:

public class TestPredicates {
    public static void main(String[] args) {
        List numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
        System.out.println(numbers.stream()
                .filter(combineFilters(x -> x > 2, x -> x < 9, x -> x % 2 == 1))
                .collect(Collectors.toList()));
    }

    public static  Predicate combineFilters(Predicate... predicates) {

        Predicate p = Stream.of(predicates).reduce(x -> true, Predicate::and);
        return p;

    }
}

Note that this will combine them with an "AND" logic operator. To combine with an "OR" the reduce line should be:

Predicate p = Stream.of(predicates).reduce(x -> false, Predicate::or);