1.定义一张牌

class Card {
    public int rank;//点数
    public String suit;//花色
 
    public Card(int rank, String suit) {
        this.rank = rank;
        this.suit = suit;
    }
 
    @Override
    public String toString() {
                return suit+" "+rank;
    }
}

2.定义一副牌

//一个数组存放牌的花色
    public static final String [] suits = {"♥", "♠", "♣", "♦"};
//循环一副牌出来
    public List<Card> buyDeskCard() {
        List<Card> cards = new ArrayList<>();
        for (int i = 1; i <= 13; i++) {
            for (int j = 0; j < 4; j++) {
                Card card = new Card(i,suits[j]);
                cards.add(card);
            }
        }
        return cards;
    }

3.洗牌

//循环 让 i 存这个牌的数组从后到前开始循环，让 i 从 0 到 i-1 的某一个数组下标的牌交换，交换完成后i-- ，一直循环完成后，洗牌也就完成了、

//洗牌
    public void shuffle(List<Card> cards) {
 
        for (int i = cards.size()-1; i > 0; i--) {
            //产生随机数
            Random random = new Random();
            int index = random.nextInt(i);
            //交换
            swap(cards,index,i);
        }
    }
//交换
    private void swap(List<Card> cards, int i, int j) {
        Card tmp = cards.get(i);
        cards.set(i,cards.get(j));
        cards.set(j,tmp);
    }

4.发牌

//如果是三个人每个人拿五张牌，这样发牌的话

//发牌也就是将洗好的牌从数组中删除

//而且发牌也要考虑，这张牌发给了谁，要能对应上

    public List<List<Card>> test(List<Card> cards) {
        //new三个人出来
        List<Card> hand1 = new ArrayList<>();
        List<Card> hand2 = new ArrayList<>();
        List<Card> hand3 = new ArrayList<>();
 
        List<List<Card>> hands = new ArrayList<>();
        hands.add(hand1);
        hands.add(hand2);
        hands.add(hand3);
        //轮流拿五张牌
        for (int i = 0; i < 5; i++) {
            for (int j = 0; j < 3; j++) {
                Card card = cards.remove(0);
                hands.get(j).add(card);
            }
        }
        return hands;
    }

5.整体代码

 class Card {
    public int rank; // 牌面值
    public String suit; // 花色
    @Override
    public String toString() {
        return String.format("[%s %d]", suit, rank);
    }
}

public class CardDemo {
    public static final String[] SUITS = {"♠", "♥", "♣", "♦"}; // 买一副牌
    private static List<Card> buyDeck() {
        List<Card> deck = new ArrayList<>(52);
        for (int i = 0; i < 4; i++) {
            for (int j = 1; j <= 13; j++) {
                String suit = SUITS[i];
                int rank = j;
                Card card = new Card();
                card.rank = rank;
                card.suit = suit;
                deck.add(card);
            }
        }
        return deck;
    }

private static void swap(List<Card> deck, int i, int j) { Card t = deck.get(i);
        deck.set(i, deck.get(j));
        deck.set(j, t); }
private static void shuffle(List<Card> deck) {
        Random random = new Random(20190905);
        for (int i = deck.size() - 1; i > 0; i--) {
        int r = random.nextInt(i);
        swap(deck, i, r);
        }
        }
public static void main(String[] args) { List<Card> deck = buyDeck(); System.out.println("刚买回来的牌:"); System.out.println(deck); shuffle(deck); System.out.println("洗过的牌:"); System.out.println(deck);
        List<List<Card>> hands = new ArrayList<>();
        hands.add(new ArrayList<>());
        hands.add(new ArrayList<>());
        hands.add(new ArrayList<>());
        for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 3; j++) {
        hands.get(j).add(deck.remove(0));
        }
        }
        System.out.println("剩余的牌:");
        System.out.println(deck);
        System.out.println("A 手中的牌:");
        System.out.println(hands.get(0));
        System.out.println("B 手中的牌:");
        System.out.println(hands.get(1));
        System.out.println("C 手中的牌:");
        System.out.println(hands.get(2));
        }
}