用java写一个纸牌游戏

好的，这里是一个简单的Java纸牌游戏示例，它实现了黑杰克（Blackjack）游戏：

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

public class BlackjackGame {
    private static final int BLACKJACK = 21;
    private static final int DEALER_STAND_VALUE = 17;

    private List<Card> deck;
    private List<Card> playerHand;
    private List<Card> dealerHand;
    private Scanner scanner;

    public BlackjackGame() {
        deck = new ArrayList<>();
        playerHand = new ArrayList<>();
        dealerHand = new ArrayList<>();
        scanner = new Scanner(System.in);
    }

    public void play() {
        System.out.println("Welcome to Blackjack!");
        while (true) {
            // 初始化
            deck.clear();
            playerHand.clear();
            dealerHand.clear();
            createDeck();
            shuffleDeck();
            dealCards();

            // 玩家回合
            playerTurn();

            // 庄家回合
            dealerTurn();

            // 结算
            int playerScore = calculateScore(playerHand);
            int dealerScore = calculateScore(dealerHand);
            System.out.println("Player's hand: " + playerHand + " (" + playerScore + ")");
            System.out.println("Dealer's hand: " + dealerHand + " (" + dealerScore + ")");
            if (playerScore == BLACKJACK) {
                System.out.println("Congratulations! You win!");
            } else if (playerScore > BLACKJACK) {
                System.out.println("Bust! You lose!");
            } else if (dealerScore > BLACKJACK) {
                System.out.println("Dealer busts! You win!");
            } else if (playerScore == dealerScore) {
                System.out.println("Push!");
            } else if (playerScore > dealerScore) {
                System.out.println("You win!");
            } else {
                System.out.println("You lose!");
            }

            // 询问是否继续游戏
            System.out.print("Play again? (y/n) ");
            String answer = scanner.nextLine();
            if (!answer.equalsIgnoreCase("y")) {
                break;
            }
        }
        System.out.println("Thanks for playing!");
        scanner.close();
    }

    private void createDeck() {
        for (Suit suit : Suit.values()) {
            for (Rank rank : Rank.values()) {
                deck.add(new Card(suit, rank));
            }
        }
    }

    private void shuffleDeck() {
        Collections.shuffle(deck);
    }

    private void dealCards() {
        playerHand.add(dealCard());
        dealerHand.add(dealCard());
        playerHand.add(dealCard());
        dealerHand.add(dealCard());
    }

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

    private int calculateScore(List<Card> hand) {
        int score = 0;
        int aceCount = 0;
        for (Card card : hand) {
            if (card.getRank().getValue() == 1) {
                aceCount++;
                score += 11;
            } else if (card.getRank().getValue() >= 10) {
                score += 10;
            } else {
                score += card.getRank().getValue();
            }
        }
        while (score > BLACKJACK && aceCount > 0) {
            score -= 10;
            aceCount--;
        }
        return score;
    }

    private void playerTurn() {
        while (true) {
            int score = calculateScore(playerHand);
            System.out.println("Player's hand: " + playerHand + " (" + score + ")");
            if (score == BLACKJACK) {
                break;
            } else if (score > BLACKJACK) {
                break;
            }
            System.out.print("Hit or stand? (h/s) ");
            String answer = scanner.nextLine();
            if (answer.equalsIgnoreCase("h")) {
                playerHand.add(dealCard());
            } else {
                break;
            }
        }
    }

    private void dealerTurn() {
        while (calculateScore(dealerHand) < DEALER_STAND_VALUE) {
            dealerHand.add(dealCard());
        }
    }

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

enum Suit {
    CLUBS, DIAMONDS, HEARTS, SPADES
}

enum Rank {
    ACE(1), 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 int value;

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

    public int getValue() {
        return value;
    }
}

class Card {
    private Suit suit;
    private 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;
    }
}

这个代码实现了一个简单的黑杰克游戏，玩家可以选择是否要 “hit”（抽一张牌）或 “stand”（不抽牌）。计分规则是将 A 点数计为 11，除此之外，点数大于 10 的牌都计为 10。当玩家或庄家的点数超过 21 时，该玩家输掉游戏。