用Java写21点游戏代码完整版

以下是一个简单的 Java 21 点游戏代码，可能与您的需求略有不同。该代码使用控制台作为用户界面，可在 IDE 中直接运行。

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class TwentyOneGame {
    private List<Card> deck;
    private List<Card> playerHand;
    private List<Card> dealerHand;
    private int playerScore;
    private int dealerScore;
    private boolean isPlayerWinner;

    public TwentyOneGame() {
        deck = new ArrayList<>();
        playerHand = new ArrayList<>();
        dealerHand = new ArrayList<>();
        playerScore = 0;
        dealerScore = 0;
        isPlayerWinner = false;

        // Initialize deck with 52 cards
        for (Card.Suit suit : Card.Suit.values()) {
            for (Card.Rank rank : Card.Rank.values()) {
                deck.add(new Card(suit, rank));
            }
        }
    }

    public void start() {
        // Shuffle deck
        shuffleDeck();

        // Deal initial hands
        dealInitialHands();

        // Check if player has blackjack
        if (playerScore == 21) {
            System.out.println("Congratulations, you have Blackjack!");
            isPlayerWinner = true;
            return;
        }

        // Player turn
        while (playerScore < 21) {
            System.out.println("Your hand: " + playerHand);
            System.out.println("Your score: " + playerScore);

            System.out.print("Do you want to hit? (Y/N): ");
            Scanner scanner = new Scanner(System.in);
            String input = scanner.nextLine();

            if (input.equalsIgnoreCase("Y")) {
                playerHand.add(drawCard());
                playerScore = getHandScore(playerHand);
            } else {
                break;
            }
        }

        // Dealer turn
        while (dealerScore < 17) {
            dealerHand.add(drawCard());
            dealerScore = getHandScore(dealerHand);
        }

        // Check winner
        if (playerScore > 21) {
            System.out.println("You busted, dealer wins!");
        } else if (dealerScore > 21) {
            System.out.println("Dealer busted, you win!");
            isPlayerWinner = true;
        } else if (playerScore == dealerScore) {
            System.out.println("It's a tie!");
        } else if (playerScore > dealerScore) {
            System.out.println("You win!");
            isPlayerWinner = true;
        } else {
            System.out.println("Dealer wins!");
        }
    }

    private void shuffleDeck() {
        for (int i = 0; i < deck.size(); i++) {
            int randomIndex = (int) (Math.random() * deck.size());
            Card temp = deck.get(i);
            deck.set(i, deck.get(randomIndex));
            deck.set(randomIndex, temp);
        }
    }

    private void dealInitialHands() {
        playerHand.add(drawCard());
        dealerHand.add(drawCard());
        playerHand.add(drawCard());
        dealerHand.add(drawCard());

        playerScore = getHandScore(playerHand);
        dealerScore = getHandScore(dealerHand);

        System.out.println("Dealer's hand: [" + dealerHand.get(0) + ", **]");
        System.out.println("Your hand: " + playerHand);
        System.out.println("Your score: " + playerScore);
    }

    private Card drawCard() {
        return deck.remove(0);
    }

    private int getHandScore(List<Card> hand) {
        int score = 0;
        boolean hasAce = false;

        for (Card card : hand) {
            if (card.getRank() == Card.Rank.ACE) {
                score += 11;
                hasAce = true;
            } else {
                score += card.getRank().getValue();
            }
        }

        if (score > 21 && hasAce) {
            score -= 10;
        }

        return score;
    }

    private static class Card {
        private final Suit suit;
        private final Rank rank;

        public Card(Suit suit, Rank rank) {
            this.suit = suit;
            this.rank = rank;
        }

        public Suit getSuit() {
            return suit;
        }

        public Rank getRank() {
            return rank;
        }

        @Override
        public String toString() {
            return rank + " of " + suit;
        }

        public enum Suit {
            CLUBS,
            DIAMONDS,
            HEARTS,
            SPADES
        }

        public enum Rank {
            ACE(11),
            TWO(2),
            THREE(3),
            FOUR(4),
            FIVE(5),
            SIX(6),
            SEVEN(7),
            EIGHT(8),
            NINE(9),
            TEN(10),
            JACK(10),
            QUEEN(10),
            KING(10);

            private final int value;

            Rank(int value) {
                this.value = value;
            }

            public int getValue() {
                return value;
            }
        }
    }

    public static void main(String[] args) {
        TwentyOneGame game = new TwentyOneGame();
        game.start();
    }
}

该代码包含一个 `TwentyOneGame` 类，该类用于管理游戏，并使用 `Card` 类来表示每个卡片。 `start()` 方法启动游戏，并处理游戏的逻辑。该代码还使用 `Scanner` 类从控制台获取用户输入。