在BlackJack Java卡上總有一些問題ouptput

Question

所以我創建了這個使用許多不同類的BlackJack Java遊戲來學習如何使用OO進行編程。然而，我真的被困在這個特定的部分，讓代碼在手中顯示正確的卡片。它只顯示一個奇怪的字符串，例如com.game.blackjack.Hand@18e2b22，或者具有不同的字符顯示。想知道如何將其轉換爲實際的卡片價值和等級？

公共類套裝{

public static final int SPADE = 0, HEART = 1, DIAMOND = 2, CLUB = 3; 

/** 
* Maps the names for the suits as a string. 
*/ 
private Map<Integer, String> suitMap = new HashMap<Integer, String>(); 

/** 
* ID for the suit 
*/ 
private int suitId = 0; 

/** 
* sets the id for the suit to get. 
*/ 
public Suit(int suitId) { 
    suitMap.put(SPADE, "Spades"); 
    suitMap.put(HEART, "Hearts"); 
    suitMap.put(DIAMOND, "Diamonds"); 
    suitMap.put(CLUB, "Clubs"); 

    this.suitId = suitId; 
} 


public String toString() { 
    return suitMap.get(suitId); 
} 

/** 
* @param suitId 
* @return suitMap 
*/ 
public String getSuitNameById(int suitId) { 
    return suitMap.get(suitId); 
} 

/** 
* @return id of suit 
*/ 
public String getSuitName() { 
    return suitMap.get(suitId); 
} 

/** 
* @return the suitId 
*/ 
public int getSuitId() { 
    return suitId; 
} 

/** 
* @param suitId the suitId to set 
*/ 
public void setSuitId(int suitId) { 
    this.suitId = suitId; 
} 

/** 
* @return the suitMap 
*/ 
public Map<Integer, String> getSuitMap() { 
    return suitMap; 
} 

/** 
* @param suitMap the suitMap to set 
*/ 
public void setSuitMap(Map<Integer, String> suitMap) { 
    this.suitMap = suitMap; 
} 

}

公共類卡{

private boolean stateOfCard = false; 

/** 
* Gives the constant values to ace jack queen and king for being special 
* types of cards. 
*/ 
public final static int ACE = 1, JACK = 11, QUEEN = 12, KING = 13; 

/** 
* Maps names to the ace jack queen and king cards. 
*/ 
private Map<Integer, String> nameMap = new HashMap<Integer, String>(); 

/** 
* Rank or type of card (2-9, J,Q,K, A) 
*/ 
private String cardRank = null; 

/** 
* Card suit 
*/ 
private Suit suit = null; 

/** 
* Numeric value of the card 
*/ 
private int cardValue = 0; 

/** 
* Gives you the suit, cardRank, and the cardValue 
*/ 
public Card(Suit suit, String cardRank, int cardValue) { 
    nameMap.put(ACE, "Ace"); 
    nameMap.put(JACK, "Jack"); 
    nameMap.put(QUEEN, "Queen"); 
    nameMap.put(KING, "King"); 

    if (cardValue >= 11 || cardValue == 1) cardRank = nameMap.get(cardValue); 

    this.suit = suit; 
    this.cardRank = cardRank; 
    this.cardValue = cardValue; 
} 
/** 
* Displays to user the rank and suit of the card. 
*/ 
public String toString() { 
    return cardRank + " of " + suit.getSuitName(); 
} 

/** 
* @return the cardRank 
*/ 
public String getCardRank() { 
    return cardRank; 
} 

/** 
* @param cardRank the cardRank to set 
*/ 
public void setCardRank(String cardRank) { 
    this.cardRank = cardRank; 
} 

/** 
* @return the suit 
*/ 
public Suit getSuit() { 
    return suit; 
} 

/** 
* @param suit the suit to set 
*/ 
public void setSuit(Suit suit) { 
    this.suit = suit; 
} 

/** 
* @return the cardValue 
*/ 
public int getCardValue() { 
    return cardValue; 
} 

/** 
* @param cardValue the cardValue to set 
*/ 
public void setCardValue(int cardValue) { 
    this.cardValue = cardValue; 
} 

/** 
* @return the nameMap 
*/ 
public Map<Integer, String> getNameMap() { 
    return nameMap; 
} 

/** 
* @param nameMap the nameMap to set 
*/ 
public void setNameMap(Map<Integer, String> nameMap) { 
    this.nameMap = nameMap; 
} 
/** 
* @return the stateOfCard 
*/ 
public boolean isStateOfCard() { 
    return stateOfCard; 
} 

/** 
* @param stateOfCard the stateOfCard to set 
*/ 
public void setStateOfCard(boolean stateOfCard) { 
    this.stateOfCard = stateOfCard; 
} 

}

公共類甲板{

/** 
* Deck of cards created 
*/ 
private ArrayList<Card> deck = new ArrayList<Card>(); 

/** 
* Keeps track of the cards that are dealt and no longer available 
*/ 
private List<Card> cardUsed = new ArrayList<Card>(); 

/** 
* The array of cards in a set. Can be shuffled and drawn from. Deck of any #. 
* @param cards 
*/ 
public Deck(int numCards) { 
    this.createDeck(numCards, 4); 
} 

/** 
* creates a deck that has cards in it with 4 suits of each 13 cards. 
* @param numCards 
* @param numSuits 
*/ 
private void createDeck(int numCards, int numSuits) { 
    deck = new ArrayList<Card>(); 
    cardUsed = new ArrayList<Card>(); 
    if ((numCards % numSuits) > 0) return; 
    for (int i=0; i < numSuits; i++) { 

     for(int j=1; j <= (numCards/numSuits); j++) { 
      deck.add(new Card(new Suit(i), j + "", j)); 
     } 
    } 
} 

/** 
* Deals a card to the hand. Sends dealt card to the cardUsed list so that 
* a used card will not be drawn again unless deck is shuffled. 
* @return dealtCard 
*/ 
public Card dealCard() { 

    Card dealtCard = null; 
    if (deck.size() == 0){ 
     deck.addAll(cardUsed); 
     this.shuffle(); 
     cardUsed = new ArrayList<Card>(); 
    } 

    dealtCard = deck.get(0); 
    deck.remove(0); 
    cardUsed.add(dealtCard); 

    return dealtCard; 
} 

/** 
* Shuffles the cards after every round. 
*/ 
public void shuffle() { 
    Collections.shuffle(deck); 
} 

/** 
* @return the deck 
*/ 
public ArrayList<Card> getDeck() { 
    return deck; 
} 

/** 
* @param deck the deck to set 
*/ 
public void setDeck(ArrayList<Card> deck) { 
    this.deck = deck; 
} 

/** 
* Returns the number of used cards 
* @return 
*/ 
public int getNumUsedCards() { 
    return cardUsed.size(); 
} 

/** 
* @return the cardUsed 
*/ 
public List<Card> getCardUsed() { 
    return cardUsed; 
} 

/** 
* @param cardUsed the cardUsed to set 
*/ 
public void setCardUsed(List<Card> cardUsed) { 
    this.cardUsed = cardUsed; 
} 

}

公共類手{

private ArrayList<Card> hand = new ArrayList<Card>(); 
int total = 0; 

/** 
* A list of cards that can be defined as hand. Player has a list of these 
* cards in a hand. 
*/ 
public Hand(){ 

} 

public boolean isAce() { 


    return false; 
} 

public boolean discardHand(){ 
    if (hand.isEmpty()) { 
     hand = new ArrayList<Card>(); 
    } 
    return false; 
} 
/** 
* Adds the card to the hand in a list of cards. 
* @param c 
*/ 
public void addCard(Card c) { 
    this.hand.add(c); 
} 

/** 
* Gets the place value of the card in the hand. 
* @param index 
* @return index of card in hand 
*/ 
public Card getPosition(int index){ 
    return hand.get(index); 
} 

/** 
* Gets how many cards are in the player's hand. 
* @return hand size 
*/ 
public int handCardCount(){ 
    return hand.size(); 
} 

/** 
* @return the total 
*/ 
public int getTotal() { 
    return total; 
} 

/** 
* @param total the total to set 
*/ 
public void setTotal(int total) { 
    this.total = total; 
} 

/** 
* @return the hand 
*/ 
public ArrayList<Card> getHand() { 
    return hand; 
} 

/** 
* @param hand the hand to set 
*/ 
public void setHand(ArrayList<Card> hand) { 
    this.hand = hand; 
} 

}

公共類播放器擴展人{

private Hand myCards = new Hand(); 
private int playerCashAmount = 100; 

public Player() { 

} 

public Player(String name) { 
    this.name = name; 
} 

/** 
* Gets the name of the user from the parent class 
*/ 
public String getName() { 
    return super.getName(); 
} 


/** 
* @return the playerCashAmount 
*/ 
public int getPlayerCashAmount() { 
    return playerCashAmount; 
} 

/** 
* @param playerCashAmount the playerCashAmount to set 
*/ 
public void setPlayerCashAmount(int playerCashAmount) { 
    this.playerCashAmount = playerCashAmount; 
} 

/** 
* @return the myCards 
*/ 
public Hand getMyCards() { 
    return myCards; 
} 

/** 
* @param myCards the myCards to set 
*/ 
public void setMyCards(Hand myCards) { 
    this.myCards = myCards; 
} 

}

公共類經銷商擴展人{

private String dealCards = null; 
private String playCards = null; 
private String shuffleDeck = null; 
private Hand computerCards = new Hand(); 

/** 
* 
*/ 
public Dealer() { 

} 

/** 
* @return the dealCards 
*/ 
public String getDealCards() { 
    return dealCards; 
} 

/** 
* @param dealCards the dealCards to set 
*/ 
public void setDealCards(String dealCards) { 
    this.dealCards = dealCards; 
} 

/** 
* @return the playCards 
*/ 
public String getPlayCards() { 
    return playCards; 
} 

/** 
* @param playCards the playCards to set 
*/ 
public void setPlayCards(String playCards) { 
    this.playCards = playCards; 
} 

/** 
* @return the shuffleDeck 
*/ 
public String getShuffleDeck() { 
    return shuffleDeck; 
} 

/** 
* @param shuffleDeck the shuffleDeck to set 
*/ 
public void setShuffleDeck(String shuffleDeck) { 
    this.shuffleDeck = shuffleDeck; 
} 

/** 
* @return the computerCards 
*/ 
public Hand getComputerCards() { 
    return computerCards; 
} 

/** 
* @param computerCards the computerCards to set 
*/ 
public void setComputerCards(Hand computerCards) { 
    this.computerCards = computerCards; 
} 

}

公共類Person {

保護的字符串名稱= NULL; 手h =新手（）;

/** 
* 
*/ 
public Person() { 

} 

/** 
* @return the name 
*/ 
public String getName() { 
    return name; 
} 

/** 
* @param name the name to set 
*/ 
public void setName(String name) { 
    this.name = name; 
} 

/** 
* @return the h 
*/ 
public Hand getH() { 
    return h; 
} 

/** 
* @param h the h to set 
*/ 
public void setH(Hand h) { 
    this.h = h; 
} 

}

公共類GameEngine {

static Scanner in = new Scanner(System.in); 
private Dealer dealer = null; 
List<Player> players = new ArrayList<Player>(); 
Hand h = new Hand(); 
Person p = new Player(); 
Player pl = new Player(); 
int bet = 0; 
Deck d = null; 
int num = 0; 

public GameEngine() { 

} 

/** 
* Plays the game by creating a new instance of the gameplay class. 
* @param args 
*/ 
public static void main(String[] args) { 
    GameEngine ge = new GameEngine(); 
    ge.gamePlay(); 
} 

/** 
* Game of BlackJack, runs all the methods that it will call to. 
*/ 
public void gamePlay() { 
    // States the title of the game. 
    //this.welcomeToGame(); 

    // Shuffles the deck and creates the number of cards for it. 
    this.deckStart(); 

    // Prompts user for number of players. 
    //this.howManyPlayers(num); 

    // Displays welcome message and asks for user's name. 
    //this.greetUser(); 

    // Deal initial cards 
    this.beginCardDeal(); 

    // Place bet on the current round. 
    //this.betAmount(pl, bet); 

    // Evaluate, get player choice (stay or hit or bust) 
    //this.evaluatePlayer(); 

    // Evaluate if bust. 
    //this.isBust(); 

    // Deal more cards to each user. 
    //this.takeHitOrStay(); 

    // All players bust/stay. 


    // Evaluate winner. 


} 

/** 
* Initializes the deck and shuffles it. 
*/ 
public void deckStart() { 
    d = new Deck(52); 
    d.shuffle(); 
} 

/** 
* Displays welcome message to the player. 
*/ 
public void welcomeToGame(){ 
    System.out.println("This is BlackJack (Double Exposure)\n\n"); 
} 

/** 
* Asks for name input and then welcomes them with name. 
*/ 
public void greetUser() { 
    System.out.print("Enter your name: "); 
    p.setName(in.next()); 
    System.out.println("Welcome, " + p.getName() + "."); 
} 

/** 
* Prompts user to input how many opponents they would like to face in the game of BlackJack. 
* @param num 
*/ 
public void howManyPlayers(int num) { 
    players = new ArrayList<Player>(); 
    System.out.print("How many other players would you like for this game? Enter here: "); 
    num = in.nextInt(); 
    for (int i=0; i < num; i++) { 
     players.add(new Player("Player " + i)); 
     System.out.println(players); 
    } 
} 

/** 
* Asks the player how much money they will bet on the hand. 
* @param pl 
* @param bet 
*/ 
public void betAmount(Player pl, int bet) { 
    while (bet == 0 || bet > pl.getPlayerCashAmount()) { 
     System.out.print("You have $" + pl.getPlayerCashAmount() + " as of now. Please enter a bet amount: "); 
     bet = in.nextInt(); 
     System.out.println("You are going to bet $" + bet + "."); 
     if (bet < 0 || bet > pl.getPlayerCashAmount()) 
      System.out.println("\nYour answer must be between $0 and $" + pl.getPlayerCashAmount()); 
     else if (bet == pl.getPlayerCashAmount()) 
      System.out.println("All in!"); 
    } 
} 

/** 
* Deals the cards to each of the players. 
*/ 
public void beginCardDeal() { 
    for (int x = 0; x < 2; x++) { 
     System.out.print("\nDealer is dealing a card. . . \n"); 
     d.dealCard(); 
     System.out.println("\nYour hand: " + pl.getMyCards()); 
     //System.out.println("New hand value test::: " + pl.getMyCards().addCard(d.dealCard())); 
    } 
} 

/** 
* Checks to see if the player's hand value is over 21. If yes then player 
* loses that round. 
*/ 
public void isBust(){ 
    if (h.getTotal() > 21) { 
     System.out.println("Sorry, you have gone over 21 and busted."); 
     int money = pl.getPlayerCashAmount() - bet; 
     System.out.println("You lost $"+bet+", and now you have "+money); 
    } 
} 

/** 
* Counts the total value of cards each player holds in their hand. 
*/ 
public void evaluatePlayer(){ 
    System.out.println("Your hand value is: "); 
    System.out.println(pl.getMyCards().getTotal()); 

} 

public String takeHitOrStay(){ 
    while (pl.getMyCards().getTotal() < 21){ 
     System.out.println("Would you like to hit[h] or stay[s]? "); 
     String choice = in.next(); 
     if (choice.equalsIgnoreCase("h")){ 
      pl.getMyCards(); 
      //System.out.println(pl.getMyCards()); 
      if (choice.equalsIgnoreCase("s")){ 
       System.out.println("Null"); 
       //finish this. 
      } 
     } 
     return choice; 
    } 
    return null; 
} 

/** 
* @return the deck 
*/ 
public Deck getDeck() { 
    return d; 
} 

/** 
* @param deck the deck to set 
*/ 
public void setDeck(Deck deck) { 
    this.d = deck; 
} 

/** 
* @return the player 
*/ 
public Player getPlayer() { 
    return pl; 
} 

/** 
* @param player the player to set 
*/ 
public void setPlayer(Player player) { 
    this.pl = player; 
} 

/** 
* @return the dealer 
*/ 
public Dealer getDealer() { 
    return dealer; 
} 

/** 
* @param dealer the dealer to set 
*/ 
public void setDealer(Dealer dealer) { 
    this.dealer = dealer; 
} 

}

我遇到的新問題是，我得到的結果是，現在空黑桃或0黑桃作爲輸出。我在Hand類中添加了toString（）函數。

public String toString(){ 
    return c.getCardValue() + " of " + s.getSuitName(); 
} 

所以這已被添加到手，並清除了我的第一個問題，只獲得每個輸出的哈希碼。關於爲什麼我將黑桃作爲輸出項的任何想法？

Answer 1

您已在多個課程上覆蓋toString，但尚未在Hand課程上覆蓋。覆蓋Hand上的toString以提供您自己的自定義字符串轉換，否則您將獲得Object執行toString，這將使用類名稱，@符號和對象的地址。

引述的Javadoc：Object類

toString方法返回由 其中物體是一個實例，所述-SIGN 字符`的類的名稱的字符串@」，以及該對象的散列 代碼的無符號十六進制表示。換句話說，該方法返回一個字符串等於 ，它的值：

的getClass（）的getName（）+ '@' + Integer.toHexString（hashCode（）方法）