Java - How to find intersection of two or more collections?

Java Collections Java 

Following example shows how to find intersection of multiple collections.

public class CollectionIntersection {

    public static <T, C extends Collection<T>> C findIntersection(C newCollection,
                                                                  Collection<T>... collections) {
        boolean first = true;
        for (Collection<T> collection : collections) {
            if (first) {
                newCollection.addAll(collection);
                first = false;
            } else {
                newCollection.retainAll(collection);
            }
        }
        return newCollection;
    }

    public static void main(String[] args) {
        List<Integer> l1 = List.of(1, 3, 5, 7, 9, 11, 13);
        List<Integer> l2 = List.of(1, 2, 3, 5, 8, 13);
        List<Integer> l3 = List.of(2, 3, 5, 7, 11, 13);
        Set<Integer> intersection = findIntersection(new HashSet<>(), l1, l2, l3);
        System.out.println(intersection);
    }
}

[3, 5, 13]