Java实现扑克牌自动发牌系统

利用Java的ArrayList实现随机给三个人发扑克牌

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

class Card{
    private int rank;
    private String suit;

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

    @Override
    public String toString() {
        return "[ " + this.suit +" : "+this.rank + " ]";
    }
}

public class TestDemo {
    private static final String[] suits = {"♥","♠","♣","♦"};

    public static List<Card> buyCard() {
        ArrayList<Card> cards= new ArrayList<>();
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 13; j++) {
                cards.add(new Card(j,suits[i]));
            }
        }
        return cards;
    }

    private static void swap(List<Card> cards ,int i ,int j){
        Card tmp = cards.get(i);
        cards.set(i,cards.get(j));
        cards.set(j,tmp);
    }

    public static void shuffle(List<Card> cards){
        int size = cards.size();
        for (int i = size - 1; i > 0; i--) {
            Random random = new Random();
            int rand = random.nextInt(i);
            swap(cards,i,rand);
        }
    }
    public static void main(String[] args) {
        List<Card> cards = buyCard();
        shuffle(cards);
        //System.out.println(cards);

        ArrayList<List<Card>> hand = new ArrayList<>();
        ArrayList<Card> hand1 = new ArrayList<>();
        ArrayList<Card> hand2 = new ArrayList<>();
        ArrayList<Card> hand3 = 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 = cards.remove(0);
                hand.get(j).add(card);
            }
        }

        System.out.println("the first people's cards :" + hand1);
        System.out.println("the second people's cards :" + hand2);
        System.out.println("the third people's cards :" + hand3);
        System.out.println("the rest cards :" + cards);
    }
}