主程序

/**
 * 斗地主游戏的开发
 * 业务需求分析
 * 业务：共有54张牌
 * 点数："3","4","5","6","7","8","9","10","J","Q","K","A","2"
 * 花色："♠","❤","♣","♦"
 * 大小王："👲","🃏"
 *点数分别要组合成4种花色，大小王各一张
 * 斗地主：发出51张牌，剩下3张作为底牌
 */
public class Gamedome {
    public static void main(String[] args) {
        //1.牌类
        //2.房间
        Room m = new Room();
        //3.启动游戏
        m.start();
    }
}

先创建一个牌类

public class Card {
    private String number;
    private String color;
    //每张牌是存在大小的
    private int size;//可以用0  1  2.......来比较大小

    public Card() {
    }

    public Card(String number, String color, int size) {
        this.number = number;
        this.color = color;
        this.size = size;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public int getSize() {
        return size;
    }

    public void setSize(int size) {
        this.size = size;
    }

    @Override
    public String toString() {
        return color + number ;
    }
}

创建房间类

import java.util.*;

public class Room {
    //必须要有一副牌
    private List<Card> allCards =new ArrayList<>();

    public Room(){
        //1.做出54张牌，存入到集合allCards
        //a.点数：个数确定了，类型确定了
        String[] numbers = {"3","4","5","6","7","8","9","10","J","Q","K","A","2"};
        //b：花色
        String[] colors ={"♠","❤","♣","♦"};
        int size =0;//表示每张牌的大小
        //c.遍历点数，再遍历花色，组织牌
        for (String number : numbers) {
            //number = "3"
            size++;//没遍历一次 size+1,来控制大小
            for (String color : colors) {
                //得到一张牌
                Card c = new Card(number,color,size);
                allCards.add(c);//存入牌
            }
        }
        //单独存入小  大  王 ,先创建两个牌对象
        Card c1 = new Card("","🃏",++size);//小王
        Card c2 = new Card("","👲",++size);//大王
        Collections.addAll(allCards,c1,c2);//将牌放入集合中去
        System.out.println("新牌"+allCards);
    }

    //开始游戏
    public void start() {
        //1.洗牌
        Collections.shuffle(allCards);
        System.out.println("洗牌后"+ allCards);

        //2.发牌，首先要定义三个玩家 选用 List(ArrayList) 集合
        List<Card> L = new ArrayList<>();
        List<Card> C = new ArrayList<>();
        List<Card> T = new ArrayList<>();

        //3.正式发牌给三个玩家 ，依次发出51张牌，剩余三张要作为底牌
        for (int i = 0; i < allCards.size()-3; i++) {
                Card c = allCards.get(i);
                //判断发牌
            if (i % 3==0){
                //请L摸牌
                L.add(c);
            }else if (i % 3==1){
                //请C摸牌
                C.add(c);
            }else if (i % 3==2){
                //请T摸牌
                T.add(c);
            }
        }

        //3.对三个玩家的牌进行排序
        sortCards(L);
        sortCards(C);
        sortCards(T);
        //4.看牌
        System.out.println("L的牌"+L);
        System.out.println("C的牌"+C);
        System.out.println("T的牌"+T);
        List<Card> lastThreeCards = allCards.subList(allCards.size()-3,allCards.size());//51 52 53
        System.out.println("底牌" + lastThreeCards);
        C.addAll(lastThreeCards);
        sortCards(C);//抢到地主后还要再排序
        System.out.println("C抢到地主后"+ C);
        }

    private void sortCards(List<Card> cards) {
        Collections.sort(cards, new Comparator<Card>() {
            @Override
            public int compare(Card o1, Card o2) {
               // return o1.getSize()-o2.getSize();//升序排
                return o2.getSize()-o1.getSize();//降序排
            }
        });
    }


}