BooleanFilter.java

import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.List;

public class BooleanFilter {

    public static void main(String... args) {
        IntegerFilter rp = new IntegerFilter();
        rp.doWork();
    }

    public void doWork() {
        List<Integer> randoms = buildList();
        randoms.stream().filter(this::isNumberEven).forEach(
                p -> {
                    System.out.println(String.format("%d is even", p));
                });
    }

    private boolean isNumberEven(Integer number) {
        return number.intValue() % 2 == 0;
    }

    private List<Integer> buildList() {
        SecureRandom rand = new SecureRandom();
        List<Integer> randoms = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            randoms.add(rand.nextInt());
        }
        return randoms;
    }
}