洗牌算法，去除大小王

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

public class Test  {
    public static void main(String[] args) {
	  //买牌
     CardDemo cardDemo=new CardDemo();
     List<Card> cardList=cardDemo.buycard();
     //洗牌
     cardDemo.wash(cardList);
        System.out.println(cardList);
     //玩牌3个人每人发5张
        List<List<Card>> ret = cardDemo.play(cardList);
        for (int i = 0; i < ret.size(); i++) {
            System.out.println("第"+(i+1)+"个人的牌"+ret.get(i));
        }
        System.out.println(cardList);
    }
}

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: czt20
 * Date: 2025 -12-07
 * Time: 21:36
 */
public class CardDemo {
    String[] suits = {"♣", "♠", "♦", "♥"};

    public List<Card> buycard() {
        List<Card> cardList = new ArrayList();
        for (int i = 1; i <= 13; i++) {
            for (int j = 0; j < 4; j++) {
                int rank = i;
                String suit = suits[j];
                Card card = new Card(suit, rank);
                cardList.add(card);
            }
        }
        return cardList;
    }

    public void wash(List<Card> cardList){
       Random random =new Random();
        for (int i = cardList.size()-1; i >0 ; i--) {
            int index= random.nextInt(i);
            swap(cardList,i,index);
        }
    }
    private void swap(List<Card> cardList,int i,int j){
        Card m=cardList.get(i);
        cardList.set(i,cardList.get(j));
        cardList.set(j,m);
    }

    public  List<List<Card>> play(List<Card> cardList ){
        List<Card>  hand1 = new ArrayList<>();
        List<Card>  hand2 = new ArrayList<>();
        List<Card>  hand3 = new ArrayList<>();

        List<List<Card>>  hand =new ArrayList<>();
        hand.add(hand1);
        hand.add(hand2);
        hand.add(hand3);
        for (int i = 0; i < 5; i++) {
            for (int j = 0; j < 3 ; j++) {
                Card card = cardList.remove(0);
                hand.get(j).add(card);

            }
        }
     return  hand;
    }
}

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: czt20
 * Date: 2025 -12-07
 * Time: 21:34
 */
public class Card {
    private String suit;
    private int rank;

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

    @Override
    public String toString() {
       /* return "Card{" +
                "suit='" + suit + '\'' +
                ", rank=" + rank +
                '}';
        */
        return "{"+suit+rank+"} ";
    }
}