斗地主发牌并按大小排序

写这个代码的思路是
1.先创建54张牌的牌库，并给每张牌一个索引（使用map）
2.洗牌
3.取3张底牌，然后把牌发给3个玩家
4.根据索引排序，来实现玩家手牌的排序
代码如下

package com.zhongruan;

import java.util.*;

public class DouDiZhu1 {
    public static Map qupai(){
        Map map=new HashMap<>();
        String[] s1={"♣","♠","♥","◇"};
        String[] s2={"3","4","5","6","7","8","9","10","J","Q","k","A","2"};
        int index=-1;
        for (String i:s2){
            for (String j:s1){
                map.put(++index,i+j);
            }
        }
        map.put(++index,"dawang");
        map.put(++index,"xiaowang");
        return map;
    }

    public static List fapai(List a1,List a2,List a3,List dipai,List paiindex){
        List list=new ArrayList<>();
        list.add(a1);
        list.add(a2);
        list.add(a3);
        list.add(dipai);
        dipai.add(paiindex.get(0));
        dipai.add(paiindex.get(1));
        dipai.add(paiindex.get(2));
        for (int i=3;i<54;i++){
            if (i%3==0){
                a1.add(paiindex.get(i));
            }
            else if (i%3==1){
                a2.add(paiindex.get(i));
            }
            else {
                a3.add(paiindex.get(i));
            }
        }
        return list;
    }

    public static void kanpai(List list,Map indexmap){
        for (Integer i:list){
            System.out.print(indexmap.get(i));
        }
        System.out.println();
    }
    
    public static void main(String[] args) {
        Map indexmap=DouDiZhu1.qupai();
        List paiindex=new ArrayList<>();
        paiindex.addAll(indexmap.keySet());
        Collections.shuffle(paiindex);
        List a1=new ArrayList<>();
        List a2=new ArrayList<>();
        List a3=new ArrayList<>();
        List dipai=new ArrayList<>();
        List wanjia=DouDiZhu1.fapai(a1,a2,a3,dipai,paiindex);
        Collections.sort(a1);
        Collections.sort(a2);
        Collections.sort(a3);
        Collections.sort(dipai);
        DouDiZhu1.kanpai(a1,indexmap);
        DouDiZhu1.kanpai(a2,indexmap);
        DouDiZhu1.kanpai(a3,indexmap);
        DouDiZhu1.kanpai(dipai,indexmap);
    }
}