CC150 OOD question BlackJack

version 5 chapter 8 question 1

https://github.com/gaylemcd/ctci/tree/master/java/Chapter%208/Question8_1

题目是设计纸牌的数据结构，并且实现blackjack游戏

首先确认设计为标准可拓展的cards

standard 52 card set, It includes thirteen ranks of each of the four French suits, clubs (♣), diamonds (♦), hearts (♥) and spades (♠), with reversible "court" or face cards

1 Suit  纸牌有四种类型（花色）

/**Suit for card*/public enum Suit{Club (0);Diamon(1);Heart(2);Spade(3);private int value;private Suit(int v){value = v;}public int getValue(){return value;}public static Suit getSuitFromValue(int value){switch(value){case 0 :return Suit.Club;case 1:return Suit.Diamon;case 2 :return Suit.Heart;case 3:return Suit.Spade;default:return null;}}}

（2） card 类

abstract card class

//card abstact class can be extendpublic abstract class Card{/* number or face that's on card a number 2 through 10,   or 11 for Jack, 12 for Queen, 13 for King, or 1 for Ace  */ protected in faceValue; protected Suit suit; private boolean available = true; public Card(int c, Suit s) {faceValue = c;suit = s;}public abstract int value();public Suit suit() { return suit; }/* returns whether or not the card is available to be given out to someone */public boolean isAvailable() {return available;}public void markUnavailable() {available = false;}public void markAvailable() {available = true;}public void print() {String[] faceValues = {"A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"};System.out.print(faceValues[faceValue - 1]);switch (suit) {case Club:System.out.print("c");break;case Heart:System.out.print("h");break;case Diamond:System.out.print("d");break;case Spade:System.out.print("s");break;}System.out.print(" ");}}

//Deckpublic class Deck<T extends Card>{private ArrayList<T> cards; // all cards, dealt or notprivate int dealtIndex = 0; // mark first undealt cardpublic Deck(){}public void setDeckOfCards(ArrayList<T> deckOfCards){cards = deckOfCards;}/*********** shuffle cards *************************/public void shuffle() {for (int i = 0; i < cards.size(); i++) {int j = randomIntInRange(i, cards.size() - i - 1);//swap with a random cardT card1 = cards.get(i);T card2 = cards.get(j);cards.set(i, card2);cards.set(j, card1);}}public int remainingCards() {return cards.size() - dealtIndex;}/************************************/public T[] dealHand(int number){if(remainingCards() < number){return null;}T[] hand = (T[]) new Card[number];int count = 0;while(count < number){T card = dealCard();if(card != null){hand[count] = card;count++;}}return hand;}public T dealCard() {if (remainingCards() == 0) {return null;}T card = cards.get(dealtIndex);card.markUnavailable();dealtIndex++;return card;}public void print() {for (Card card : cards) {card.print();}}public static int randomInt(int n) {return (int) (Math.random() * n);}public static int randomIntInRange(int min, int max) {return randomInt(max + 1 - min) + min;}}

//card in Hand for playerpublic class Hand <T extends Card> {protected ArrayList<T> cards = new ArrayList<T>();public int score() {int score = 0;for (T card : cards) {score += card.value();}return score;}public void addCard(T card) {cards.add(card);}public void print() {for (Card card : cards) {card.print();}}}

// for blackjack game face cards are 10 and ace is 11public class BlackJackCard extends Card {public BlackJackCard(int c, Suit s){super(c, s);}public int value(){//implement this functionif (isAce()) { // Acereturn 1; } else if (faceValue >= 11 && faceValue <= 13) { // Face cardreturn 10;} else { // Number cardreturn faceValue;}}public int minValue() {if (isAce()) { // Acereturn 1; } else {return value();}}public int maxValue() {if (isAce()) { // Acereturn 11; } else {return value();}}public boolean isAce() { return faceValue == 1;} public boolean isFaceCard() {return faceValue >= 11 && faceValue <= 13;}}

public class BlackJackHand extends Hand<BlackJackCard> {public BlackJackHand() {}public int score() {ArrayList<Integer> scores = possibleScores();int maxUnder = Integer.MIN_VALUE;int minOver = Integer.MAX_VALUE;for (int score : scores) {if (score > 21 && score < minOver) {minOver = score;} else if (score <= 21 && score > maxUnder) {maxUnder = score;}}return maxUnder == Integer.MIN_VALUE ? minOver : maxUnder;}private ArrayList<Integer> possibleScores() {ArrayList<Integer> scores = new ArrayList<Integer>();if (cards.size() == 0) {return scores;}for (BlackJackCard card : cards) {addCardToScoreList(card, scores);}return scores;}private void addCardToScoreList(BlackJackCard card, ArrayList<Integer> scores) {if (scores.size() == 0) {scores.add(0);} int length = scores.size();for (int i = 0; i < length; i++) {int score = scores.get(i);scores.set(i, score + card.minValue());if (card.minValue() != card.maxValue()) {scores.add(score + card.maxValue());}}}public boolean busted() {return score() > 21;}public boolean is21() {return score() == 21;}public boolean isBlackJack() {if (cards.size() != 2) {return false;}BlackJackCard first = cards.get(0);BlackJackCard second = cards.get(1);return (first.isAce() && second.isFaceCard()) || (second.isAce() && first.isFaceCard());}}

Core part: the game systempublic class BlackJackGameAutomator {     private Deck<BlackJackCard> deck;     private BlackJackHand[] hands;     private static final int HIT_UNTIL = 16;     public BlackJackGameAutomator(int numPlayers) {          hands = new BlackJackHand[numPlayers];          for (int i = 0; i < numPlayers; i++) {               hands[i] = new BlackJackHand();          }     }     public boolean dealInitial(){          //each person get two card          for(BlackJackHand hand : hands){               BlackJackCard card1 = deck.dealCard();               BlackJackCard card2 = deck.dealCard();               if (card1 == null || card2 == null) {                    return false;               }               hand.addCard(card1);               hand.addCard(card2);          }          return true;     }     public ArrayList<Integer> getBlackJacks() {          ArrayList<Integer> winners = new ArrayList<Integer>();          for (int i = 0; i < hands.length; i++) {               if (hands[i].isBlackJack()) {                    winners.add(i);               }          }          return winners;     }     public boolean playHand(int i) {          BlackJackHand hand = hands[i];          return playHand(hand);     }     public boolean playHand(BlackJackHand hand) {          while (hand.score() < HIT_UNTIL) {          //get one more card               BlackJackCard card = deck.dealCard();               if (card == null) {                    return false;               }               hand.addCard(card);          }          return true;     }     public boolean playAllHands() {          for (BlackJackHand hand : hands) {               if (!playHand(hand)) {                    return false;               }          }          return true;     }     public ArrayList<Integer> getWinners() {          ArrayList<Integer> winners = new ArrayList<Integer>();          int winningScore = 0;          for (int i = 0; i < hands.length; i++) {               BlackJackHand hand = hands[i];               if (!hand.busted()) {//<=21                    if (hand.score() > winningScore) {                         winningScore = hand.score();                         winners.clear();                         winners.add(i);                    } else if (hand.score() == winningScore) {                         winners.add(i);                    }               }          }          //winner with max score          return winners;     }     public void initializeDeck() {          ArrayList<BlackJackCard> cards = new ArrayList<BlackJackCard>();          //generate 52 cards , 13 in each suit          for (int i = 1; i <= 13; i++) {               //loop each suit               for (int j = 0; j <= 3; j++) {                    Suit suit = Suit.getSuitFromValue(j);                    BlackJackCard card = new BlackJackCard(i, suit);                    cards.add(card);               }          }                    deck = new Deck<BlackJackCard>();          deck.setDeckOfCards(cards); // add all cards          deck.shuffle();     //shuffle all cards     }          public void printHandsAndScore() {          for (int i = 0; i < hands.length; i++) {               System.out.print("Hand " + i + " (" + hands[i].score() + "): ");               hands[i].print();               System.out.println("");          }     }}Test function:public static void main(String[] args) {               int numHands = 5;                    BlackJackGameAutomator automator = new BlackJackGameAutomator(numHands);          automator.initializeDeck();          boolean success = automator.dealInitial();          if (!success) {               System.out.println("Error. Out of cards.");          } else {               System.out.println("-- Initial --");               automator.printHandsAndScore();               ArrayList<Integer> blackjacks = automator.getBlackJacks();               if (blackjacks.size() > 0) {                    System.out.print("Blackjack at ");                    for (int i : blackjacks) {                         System.out.print(i + ", ");                    }                    System.out.println("");               } else {                    success = automator.playAllHands();                    if (!success) {                         System.out.println("Error. Out of cards.");                    } else {                         System.out.println("\n-- Completed Game --");                         automator.printHandsAndScore();                                                  ArrayList<Integer> winners = automator.getWinners();                         if (winners.size() > 0) {                              System.out.print("Winners: ");                              for (int i : winners) {                                   System.out.print(i + ", ");                              }                              System.out.println("");                         } else {                              System.out.println("Draw. All players have busted.");                         }                    }               }          }     }