java21点扑克牌小游戏

好的，我可以为您提供一个简单的Java 21点扑克牌小游戏的示例代码。

首先，您需要创建一个名为`Blackjack`的Java类，并使用以下代码：

import java.util.*;

public class Blackjack {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        Deck deck = new Deck();
        deck.shuffle();
        System.out.println("Welcome to Blackjack!");
        System.out.print("Enter your name: ");
        String playerName = input.nextLine();
        Player player = new Player(playerName);
        Dealer dealer = new Dealer();
        System.out.println("Dealing cards...");
        player.addCard(deck.dealCard());
        dealer.addCard(deck.dealCard());
        player.addCard(deck.dealCard());
        dealer.addCard(deck.dealCard());
        System.out.println(player);
        System.out.println(dealer);
        boolean playerBust = false;
        boolean dealerBust = false;
        while (true) {
            System.out.print("Would you like to hit or stand? ");
            String choice = input.nextLine();
            if (choice.equalsIgnoreCase("hit")) {
                player.addCard(deck.dealCard());
                System.out.println(player);
                if (player.getScore() > 21) {
                    System.out.println("Bust! You lose.");
                    playerBust = true;
                    break;
                }
            } else if (choice.equalsIgnoreCase("stand")) {
                break;
            }
        }
        if (!playerBust) {
            while (dealer.getScore() < 17) {
                dealer.addCard(deck.dealCard());
                System.out.println(dealer);
                if (dealer.getScore() > 21) {
                    System.out.println("Dealer busts! You win.");
                    dealerBust = true;
                    break;
                }
            }
            if (!dealerBust) {
                if (player.getScore() > dealer.getScore()) {
                    System.out.println("You win!");
                } else if (player.getScore() < dealer.getScore()) {
                    System.out.println("You lose.");
                } else {
                    System.out.println("It's a tie.");
                }
            }
        }
    }
}

这个示例代码使用了三个类：`Player`，`Dealer`和`Deck`。您需要在程序中创建这些类的实例。下面是这些类的代码：

import java.util.*;

public class Player {
    private String name;
    private List<Card> hand;

    public Player(String name) {
        this.name = name;
        this.hand = new ArrayList<Card>();
    }

    public void addCard(Card card) {
        this.hand.add(card);
    }

    public int getScore() {
        int score = 0;
        for (Card card : this.hand) {
            score += card.getValue();
        }
        for (Card card : this.hand) {
            if (card.getValue() == 11 && score > 21) {
                score -= 10;
            }
        }
        return score;
    }

    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(this.name);
        sb.append(": ");
        for (Card card : this.hand) {
            sb.append(card);
            sb.append(", ");
        }
        sb.delete(sb.length() - 2, sb.length());
        sb.append(" (");
        sb.append(this.getScore());
        sb.append(")");
        return sb.toString();
    }
}

import java.util.*;

public class Dealer {
    private List<Card> hand;

    public Dealer() {
        this.hand = new ArrayList<Card>();
    }

    public void addCard(Card card) {
        this.hand.add(card);
    }

    public int getScore() {
        int score = 0;
        for (Card card : this.hand) {
            score += card.getValue();
        }
        for (Card card : this.hand) {
            if (card.getValue() == 11 && score > 21) {
                score -= 10;
            }
        }
        return score;
    }

    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("Dealer: ");
        sb.append(this.hand.get(0));
        sb.append(", [Hidden]");
        return sb.toString();
    }
}

import java.util.*;

public class Deck {
    private List<Card> cards;

    public Deck() {
        String[] suits = {"Hearts", "Diamonds", "Clubs", "Spades"};
        String[] ranks = {"Ace", "2", "3", "4", "5", "6", "7", "8", "9", "10", "Jack", "Queen", "King"};
        this.cards = new ArrayList<Card>();
        for (String suit : suits) {
            for (String rank : ranks) {
                int value = Integer.parseInt(rank);
                if (rank.equals("Ace")) {
                    value = 11;
                } else if (rank.equals("Jack") || rank.equals("Queen") || rank.equals("King")) {
                    value = 10;
                }
                Card card = new Card(suit, rank, value);
                this.cards.add(card);
            }
        }
    }

    public void shuffle() {
        Collections.shuffle(this.cards);
    }

    public Card dealCard() {
        return this.cards.remove(0);
    }
}

这些类中的`Card`类也需要定义，这个类表示一张扑克牌：

public class Card {
    private String suit;
    private String rank;
    private int value;

    public Card(String suit, String rank, int value) {
        this.suit = suit;
        this.rank = rank;
        this.value = value;
    }

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

    public String toString() {
        return this.rank + " of " + this.suit;
    }
}

当您运行这个程序时，它将提示您输入您的姓名，然后开始发牌。您可以选择要“hit”或“stand”。如果您的得分超过21分，则会输掉比赛。如果您选择“stand”，则荷官将继续抽牌，直到得分达到17分或更高。如果荷官超过21分，则您将赢得比赛。否则，将比较您和荷官的得分，得分更高的人将赢得比赛。