模拟发牌

import java.util.*;

public class Demo {
        public static void main(String[] args) {
            //花色♠♣♥♦
            List<String> colors = new ArrayList<>();
            colors.add("♠");
            colors.add("♣");
            colors.add("♥");
            colors.add("♦");

            //数字345678910JQKA2
            List<String> numbers = new ArrayList<>();
            Collections.addAll(numbers,"3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A", "2");

            //大小王： 大☻ 小☻
            //定义Map，用数字来记录每一张牌
            Map<Integer, String> map = new HashMap<>();
            Integer squence = 0;//牌的顺序
            //加入其它牌
            for (String number : numbers) {
                for (String color : colors) {
                    //一副牌54张，序号范围在[0,51]之间
                    if (squence <= 51) {
                        map.put(squence, number + "(" + color + ")");
                        squence++;
                    }
                }
            }
            map.put(squence, "小☻");
            squence++;
            map.put(squence, "大☻");
            squence++;
            //使用0~53来记录每一张牌
            List<Integer> cards = new ArrayList<>(map.keySet());
            Collections.shuffle(cards);
            System.out.println(cards);

            //三个玩家和底牌
            List<Integer> player1 = new ArrayList<Integer>();
            List<Integer> player2 = new ArrayList<Integer>();
            List<Integer> player3 = new ArrayList<Integer>();
            List<Integer> end = new ArrayList<Integer>();

            //发牌
            for (int index = 0; index < cards.size(); index++) {
                if (index < 51) {
                    int mod = index % 3;//index除以3的余数
                    int card = cards.get(index);
                    if (mod == 1) {
                        player1.add(card);
                    } else if (mod == 2) {
                        player2.add(card);
                    } else {
                        player3.add(card);
                    }
                } else {
                    end.add(cards.get(index));
                }
            }

            System.out.println(player1);
            System.out.println(player2);
            System.out.println(player3);
            System.out.println(end);
            //排序
            Collections.sort(player1);
            Collections.sort(player2);
            Collections.sort(player3);
            Collections.sort(end);

            //各自手上的牌
            List<String> player1Cards = new ArrayList<>();
            List<String> player2Cards = new ArrayList<>();
            List<String> player3Cards = new ArrayList<>();
            List<String> endCards = new ArrayList<>();

            for (Integer key : player1) {
                player1Cards.add(map.get(key));
            }
            for (Integer key : player2) {
                player2Cards.add(map.get(key));
            }
            for (Integer key : player3) {
                player3Cards.add(map.get(key));
            }
            for (Integer key : end) {
                endCards.add(map.get(key));
            }

            //看牌
            System.out.println("玩家1：" + player1Cards);
            System.out.println("玩家2：" + player2Cards);
            System.out.println("玩家3：" + player3Cards);
            System.out.println("底牌  ：" + endCards);
        }
    }