import java.util.ArrayList; import java.util.Collections; import java.util.List; class Poker { private List hands; private List numericalValues; private List counts; public Poker(List hands) { this.hands = hands; } public List getBestHands() { List bestHands = new ArrayList<>(); bestHands.add(hands.get(0)); for (int i = 1; i < hands.size(); i++) { if (getHandRank(hands.get(i)) > getHandRank(bestHands.get(0))) { bestHands.set(0, hands.get(i)); } else if (getHandRank(hands.get(i)) == getHandRank(bestHands.get(0))) { getHandRank(bestHands.get(0)); List firstHand = counts; getHandRank(hands.get(i)); List secondHand = counts; if (firstHand.equals(secondHand)) { bestHands.add(hands.get(i)); } else { for (int j = 4; j >= 2; j--) { if (firstHand.contains(j) && secondHand.contains(j)) { if (firstHand.lastIndexOf(j) < secondHand.lastIndexOf(j)) { bestHands.set(0, hands.get(i)); break; } else if (firstHand.lastIndexOf(j) > secondHand.lastIndexOf(j)) { break; } else if (firstHand.lastIndexOf(j) == secondHand.lastIndexOf(j) && j == 2) { if (firstHand.indexOf(j) < secondHand.indexOf(j)) { bestHands.set(0, hands.get(i)); } } } } for (int k = firstHand.size() - 1; k >= 0; k--) { if (firstHand.get(k) <= 1 && secondHand.get(k) <= 1) { if (firstHand.get(k) < secondHand.get(k)) { bestHands.set(0, hands.get(i)); break; } else if (firstHand.get(k) > secondHand.get(k)) { break; } } } } } } return bestHands; } public int getHandRank(String hand) { String[] cards = hand.split(" "); List values = new ArrayList<>(); List suits = new ArrayList<>(); for (String card : cards) { if (card.length() == 2) { values.add(card.substring(0, 1)); suits.add(card.substring(1)); } else { values.add(card.substring(0, 2)); suits.add(card.substring(2)); } } for (int i = 0; i < values.size(); i++) { switch (values.get(i)) { case "J" -> values.set(i, "11"); case "Q" -> values.set(i, "12"); case "K" -> values.set(i, "13"); case "A" -> { if (values.contains("2") && values.contains("3") && values.contains("4") && values.contains("5")) { values.set(i, "1"); } else { values.set(i, "14"); } } } } numericalValues = new ArrayList<>(); for (String value : values) { numericalValues.add(Integer.valueOf(value)); } Collections.sort(numericalValues); List possibleValues = new ArrayList<>(); counts = new ArrayList<>(); for (int i = 1; i <= 14; i++) { counts.add(i - 1, countOccurrences(i)); possibleValues.add(i); } boolean isStraight = Collections.indexOfSubList(possibleValues, numericalValues) != -1; boolean isFlush = suits.stream().distinct().count() == 1; if (isStraight & isFlush) { return 8; // straight flush } else if (counts.contains(4)) { return 7; // four of a kind } else if (counts.contains(3) && counts.contains(2)) { return 6; // full house } else if (isFlush) { return 5; // flush } else if (isStraight) { return 4; // straight } else if (counts.contains(3)) { return 3; // three of a kind } else if (counts.stream().filter(value -> value == 2).count() == 2) { return 2; // two pair } else if (counts.contains(2)) { return 1; // pair } else { return 0; // high card } } public int countOccurrences(int valueToFind) { return (int) numericalValues.stream().filter(value -> value.equals(valueToFind)).count(); } }