卡牌类

public class Card {
    private String size;//大小
    private String color;//花色
    private int value;//权值

    public Card() {
    }

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


    public String toString(){
        return size+color;
    }

    /**
     * 获取
     * @return size
     */
    public String getSize() {
        return size;
    }

    /**
     * 设置
     * @param size
     */
    public void setSize(String size) {
        this.size = size;
    }

    /**
     * 获取
     * @return color
     */
    public String getColor() {
        return color;
    }

    /**
     * 设置
     * @param color
     */
    public void setColor(String color) {
        this.color = color;
    }

    /**
     * 获取
     * @return value
     */
    public int getValue() {
        return value;
    }

    /**
     * 设置
     * @param value
     */
    public void setValue(int value) {
        this.value = value;
    }
}

 玩家类

import java.util.List;

public class Player {
    private String name;// 玩家姓名
    private List<Card> cards;// 玩家手牌

    public Player() {
    }

    public Player(String name, List<Card> cards) {
        this.name = name;
        this.cards = cards;
    }

    /**
     * 获取
     * @return name
     */
    public String getName() {
        return name;
    }

    /**
     * 设置
     * @param name
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * 获取
     * @return cards
     */
    public List<Card> getCards() {
        return cards;
    }

    /**
     * 设置
     * @param cards
     */
    public void setCards(List<Card> cards) {
        this.cards = cards;
    }

    public String toString() {
        return "Player{name = " + name + ", cards = " + cards + "}";
    }
}

游戏类（程序入口）

import java.util.*;

public class game {
    public static void main(String[] args) {
        //1.准备花色
        String[] colors = {"♥", "♠", "♣", "♦"};
        //2.准备点数
        String[] numbers = {"3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A", "2"};
        //3.准备牌
        List<Card> cards = new ArrayList<>();
        //4.添加牌 count代表权值
        int count = 0;
        for (String number : numbers) {
            count++;
            for (String color : colors) {
                cards.add(new Card(color, number, count));
            }
        }
        //5.添加大王和小王
        cards.add(new Card("🃏", "", 14));
        cards.add(new Card("👲", "", 15));
        System.out.println(cards);

        //6.洗牌
        Collections.shuffle(cards);//比for循环更优雅
        System.out.println(cards);

        //7.发牌，并且要留3张底牌
        List<Player> players = new ArrayList<>();
        players.addAll(Arrays.asList(new Player("张三", new ArrayList<>()),
        new Player("李四", new ArrayList<>()), new Player("王五", new ArrayList<>())));
        for (int i = 0; i < cards.size()-3; i++) {
            if (i%3==0){
                //如果下标取余是0，则给张三发一张
                players.get(0).getCards().add(cards.get(i));
            }else if (i%3==1){
                //如果下标取余是1，则给李四发一张
                players.get(1).getCards().add(cards.get(i));
            }else {
                //如果下标取余是2，则给王五发一张
                players.get(2).getCards().add(cards.get(i));
            }
        }
        //通过随机数把地主牌放到对应的人里面，如果随机数是0，则张三当地主。
        Random random = new Random();
        int index = random.nextInt(3);
        players.get(index).getCards().addAll(cards.subList(cards.size()-3,cards.size()));
        //根据stream流对玩家的牌进行排序
        players.forEach(player -> {
            player.getCards().sort(Comparator.comparingInt(Card::getValue));
            System.out.println(player);
        });

    }
}

程序运行结果 

小结

1.Collections.shuffle(cards);//比for循环更优雅代码量少，同样比stream流优雅，stream不会对对象本身操作，因此排序后还要再重新赋值，故这里不选用stream流实现排序。

2.通过对card类封装value属性可以很好的解决斗地主2比3大的问题，这里体现了面向对象的思想。