HandPowerRanker can't detect A-5 Straight.

[garzy]

This is because A can be maximun (T,J,Q,K,A) an minimum (A,2,3,4,5). You must search explicity for A-5 Straight if in your Straight check you found an Ace.

Replace getStraightNumber method whith this two.

private CardNumber getStraightNumber(List cardNumbers) {
CardNumber straightNumber = null;
int straightCount = 1;
int prevPower = 0;
Collections.sort(cardNumbers, cardNumberComparator);
boolean aceFounded = false;
for (CardNumber cardNumber : cardNumbers) {
if (cardNumber == CardNumber.ACE) {
aceFounded = true;
}
if (cardNumber.getPower() == prevPower + 1) {
straightCount++;
if (straightCount >= 5) {
straightNumber = cardNumber;
}
} else {
straightCount = 1;
}
prevPower = cardNumber.getPower();
}
if (straightNumber == null && aceFounded) {
return getLowestStraightNumberWithAce(cardNumbers.subList(0, cardNumbers.size() - 1));
}
return straightNumber;
}

private CardNumber getLowestStraightNumberWithAce(List<CardNumber> fromTwoList) {
    CardNumber straightNumber = null;
    int straightCount = 1;
    int prevPower = 1; // ACE
    for (CardNumber cardNumber : fromTwoList) {
        if (cardNumber.getPower() == prevPower + 1) {
            straightCount++;
            if (straightCount >= 5) {
                straightNumber = cardNumber;
            }
        } else {
            straightCount = 1;
        }
        prevPower = cardNumber.getPower();
    }
    return straightNumber;
}

(@see http://stackoverflow.com/questions/530208/function-to-determine-whether-a-poker-hand-is-a-straight)

[garzy]

Refixed method:

private static List getLowestStraightNumberWithAce(List fromTwoList) {
List result = new ArrayList<>();
result.add(CardNumber.ACE);
int prevPower = 1; // ACE
for (CardNumber cardNumber : fromTwoList) {
if (cardNumber.getPower() == prevPower + 1) {
result.add(cardNumber);
prevPower = cardNumber.getPower();
}
}
if (result.size() < 5) {
return null;
}
Collections.reverse(result); // mayor to minor (5,4,3,2,A)
return result;
}

[AdrianAcala]

Just to let you know, the code hasn't been updated in 3 years and there's a pull request in July 2015. This project is pretty dead. No license either, which sucks.