Convert a HashMap

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Collectors.counting() returns long values for each key in this method:

private static Map<Integer, Long> countDuplicates(HashSet<Card> cards) {
    return cards.stream().collect(Collectors.groupingBy(Card::getRankNumber, Collectors.counting()));
}

Is there a way to cast or convert the resulting Map from Map<Integer, Long> to Map<Integer, Integer>? Direct casting gives this exception:

Type mismatch: cannot convert from Map<Integer,Integer> to Map<Integer,Long>

Note: The implementation of my class guarantees that cards has five objects in it, so there is no chance of overflow.



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