Could someone write detail comments or decriptions on the code that can help me to study the code? what is cards.length; Card[] player2 = readCards();Integer.toString(card)? And give me some concrete example on some method calculations. I am trying to learn java language. Thank you.

import java.util.Scanner;

public class PlayCards { public static Scanner in;

public static final String STRAIGHT_FLUSH = "STRAIGHT FLUSH"; public static final String FOUR_OF_KIND = "FOUR OF A KIND"; public static final String FULL_HOUSE = "FULL HOUSE"; public static final String FLUSH = "FLUSH"; public static final String STRAIGHT = "STRAIGHT"; public static final String THREE_OF_KIND = "THREE OF A KIND"; public static final String TWO_PAIR = "TWO PAIR"; public static final String ONE_PAIR = "ONE PAIR"; public static final String HIGH_CARD = "HIGH CARD";

public static String[] handArray = { STRAIGHT_FLUSH, FOUR_OF_KIND, FULL_HOUSE, FLUSH, STRAIGHT, THREE_OF_KIND, TWO_PAIR, ONE_PAIR, HIGH_CARD };

public static String getCardValue(int card) { if (card == 1) { return "A"; } else if (card >= 2 && card <= 10) { return Integer.toString(card); } else if (card == 11) { return "J"; } else if (card == 12) { return "Q"; } else if (card == 13) { return "K"; } else { return ""; } }

public static String getSuitValue(char suit) { if (suit == 'S') { return "Spades"; } else if (suit == 'D') { return "Diamonds"; } else if (suit == 'H') { return "Hearts"; } else if (suit == 'C') { return "Clubs"; } else { return ""; } }

public static boolean hasAPair(Card[] cards) { for (int i = 0; i < cards.length - 1; ++i) { if (cards[i].value == cards[i + 1].value) { return true; } } return false; }

public static boolean hasThreeOfAKind(Card[] cards) { for (int i = 0; i < cards.length - 2; ++i) { if (cards[i].value == cards[i + 1].value && cards[i].value == cards[i + 2].value) return true; } return false; }

public static boolean hasFourOfAKind(Card[] cards) { for (int i = 0; i < cards.length - 3; ++i) { if (cards[i].value == cards[i + 1].value && cards[i].value == cards[i + 2].value && cards[i].value == cards[i + 3].value) return true; } return false; }

public static boolean hasTwoPair(Card[] cards) { int val = -1; for (int i = 0; i < cards.length - 1; ++i) { if (cards[i].value == cards[i + 1].value && cards[i].value != val) { if (val == -1) { val = cards[i].value; } else { return true; } } } return false; }

public static boolean hasAFlush(Card[] cards) { for (int i = 0; i < cards.length - 1; ++i) { if (cards[i].suit != cards[i + 1].suit) { return false; } } return true; }

public static boolean hasStraight(Card[] cards) { if (cards[0].value == 1 && cards[1].value == 10 && cards[2].value == 11 && cards[3].value == 12 && cards[4].value == 13) { return true; } for (int i = 0; i < cards.length - 1; ++i) { if (cards[i].value != cards[i + 1].value - 1) { return false; } } return true; }

public static boolean hasAFullHouse(Card[] cards) { int pairValue = -1; for (int i = 0; i < cards.length - 1; ++i) { if (cards[i].value == cards[i + 1].value) { pairValue = cards[i].value; } } if (pairValue != -1) { for (int i = 0; i < cards.length - 2; ++i) { if (cards[i].value == cards[i + 1].value && cards[i].value == cards[i + 2].value && cards[i].value != pairValue) return true; } } return false; }

public static boolean hasStraightFlush(Card[] cards) { return hasAFlush(cards) && hasStraight(cards); }

public static String getHand(Card[] cards) { String ret = ""; for (int i = 0; i < cards.length; ++i) { ret += getCardValue(cards[i].value) + Character.toString(cards[i].suit) + " "; } return ret; }

public static String bestHand(Card[] cards){ if(hasStraightFlush(cards)){ return STRAIGHT_FLUSH; } else if(hasFourOfAKind(cards)){ return FOUR_OF_KIND; } else if(hasAFullHouse(cards)){ return FULL_HOUSE; } else if(hasAFlush(cards)){ return FLUSH; } else if(hasStraight(cards)){ return STRAIGHT; } else if(hasThreeOfAKind(cards)){ return THREE_OF_KIND; } else if(hasTwoPair(cards)){ return TWO_PAIR; } else if(hasAPair(cards)){ return ONE_PAIR; } else{ return HIGH_CARD; } } private static int findHand(String hand){ for(int i = 0; i < handArray.length; ++i){ if(handArray[i].equalsIgnoreCase(hand)) return i; } return -1; } public static int whoWon(String player1, String player2){ int ind1 = findHand(player1); int ind2 = findHand(player2); return ind1 - ind2; } public static Card[] readCards(){ Card[] cards = new Card[5]; for (int i = 0; i < 5; ++i) { cards[i] = new Card(); cards[i].value = in.nextInt(); cards[i].suit = in.next().charAt(0); } return cards; }

public static void main(String args[]) { in = new Scanner(System.in); System.out.print("Enter Player 1's cards: "); Card[] player1 = readCards(); System.out.println("Player 1's hand: " + getHand(player1)); String hand1 = bestHand(player1); System.out.println("Best Hand: " + hand1); in.nextLine(); System.out.print("Enter Player 2's cards: "); Card[] player2 = readCards(); System.out.println("Player 2's hand: " + getHand(player2)); String hand2 = bestHand(player2); System.out.println("Best Hand: " + hand2);

if(whoWon(hand1, hand2) < 0){ System.out.println("Player 1 Wins!"); } else if(whoWon(hand1, hand2) > 0){ System.out.println("Player 2 Wins!"); } else{ System.out.println("Tie!"); } }

}

class Card { public int value; public char suit; }