Card.java
package com.jiang.cards;

//要比较卡牌的大小，所以要添加比较方法
public class Card implements Comparable<Card> {

	public String suit;
	//花色
	public String number;
	//点数
	Card(String suit, String number){
		this.suit=suit;
		this.number=number;
	}
	
	//展示卡牌信息用
	public String toString(){
		return suit+number;
	}
	
	//实现比较方法
	public int compareTo(Card c){
		if(this.getNumberNum()==c.getNumberNum())
			return this.getSuitNum()-c.getSuitNum();
		else return this.getNumberNum()-c.getNumberNum();
	}
	
	//获取点数排序
	public int getNumberNum(){
		String[] numbers={"2","3","4","5","6","7","8","9","10", "J","Q","K","A"};
		for(int i=0;i<numbers.length;i++){
			if(numbers[i].equals(number))
				return i;
		}
		return -1;
	}

	//获取花色排序
	public int getSuitNum(){
		String[] suits={"黑桃","红桃","梅花","方片"};
		for(int i=0;i<suits.length;i++){
			if(suits[i].equals(suit))
				return i;
		}
		return -1;
	}
}

Player.java
package com.jiang.cards;

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

//用户类，为了防止ID重复，重写了equals，这样可以调用contains判断
public class Player {
	
	public String id;
	public String name;
	public List<Card> cards;
	Player(String id, String name){
		this.id=id; this.name=name;
		cards=new ArrayList<Card>();
	}
	public void setCards(Card c){
		cards.add(c);
	}
	//重写toString只是为了写程序的时候测试用着方便
	public String toString(){
		return "Name:"+name;
	}
	public boolean equals(Object o){
		if(this==o)
			return true;
		if(o==null)
			return false;
		if(!(o instanceof Player))
			return false;
		Player p=(Player)o;
		return id.equals(p.id);
	}
}

Game.java
package com.jiang.cards;

import java.util.ArrayList;
import java.util.Collections;
import java.util.InputMismatchException;
import java.util.List;
import java.util.Random;
import java.util.Scanner;

public class Game {
	
	private List<Card> cards;
	private List<Player> players;
	Game(){
		cards=new ArrayList<Card>();
		players=new ArrayList<Player>();
	}
	//初始化卡牌 
	public void setCards(){
		System.out.println("-----------创建扑克牌--------------");
		String[] suits={"黑桃","红桃","梅花","方片"};//花色 
		String[] numbers={"2","3","4","5","6","7","8","9","10", "J","Q","K","A"};//点数 
		for(int i=0;i<suits.length;i++){
			for(int j=0;j<numbers.length;j++){
				cards.add(new Card(suits[i],numbers[j]));
			}
		}
		System.out.println("-----------扑克牌创建成功！--------------");
		System.out.println(cards);
	}
	//洗牌，第一个对象插入随机位置
	public void shuffle(){
		System.out.println("-----------开始洗牌！--------------");
		Random random=new Random();
		for(int i=0;i<cards.size();i++){
			//洗牌次数我随便设的，没有科学依据 
			Card c=cards.get(0);
			//获取第一个元素
			cards.add(random.nextInt(cards.size()),c);
			//将第一个元素再次添加在任意位置 
			cards.remove(0);
			//移除第一个元素
		}
		System.out.println("-----------洗牌结束！--------------");
		//System.out.println(cards); }
	}
	//初始化玩家2人
	public void setPlayers(){
		Scanner in=new Scanner(System.in);
		int i=1;
		do{
			System.out.println("请输入第"+i+"位玩家的ID和姓名:");
			while(true){
				try{
					System.out.println("请输入ID:");
					int id=in.nextInt();
					if(players.contains(new Player(id+"",null)))
						throw new Exception();
					//ID已存在，抛出异常 System.out.println("请输入玩家姓名:");
					System.out.println("请输入姓名:");
					String name=in.next();
					players.add(new Player(id+"",name));
					break;
					//新建信息成功，跳出循环
				}catch(InputMismatchException e){
					in=new Scanner(System.in);
					//这个必须有，不然就是死循环了
					System.out.println("请输入整数类型的ID!");
				}catch(Exception e){
					System.out.println("该ID已存在，请重新输入！");
				}
			}
				i++;
		}while(i<3);
		for(int j=0;j<players.size();j++){
			System.out.println("---欢迎玩家："+players.get(j).name);
		}
	}
		
	//发牌
	public void dealCards(){
		System.out.println("-----------开始发牌！--------------");
		for(int i=0;i<2;i++){//每人发牌数i
			for(int j=0;j<players.size();j++){//玩家数j
				System.out.println("---玩家"+players.get(j).name+"-拿牌");
				players.get(j).setCards(cards.get(0)); cards.remove(0);
			} 
		}
		System.out.println("-----------发牌结束！--------------");
	}
	
	//比较卡牌大小
	public void playCards(){
		System.out.println("-----------游戏开始！--------------");
		for(int i=0;i<players.size();i++){
			Collections.sort(players.get(i).cards);
			System.out.println("玩家："+players.get(i).name+"最大的手牌为"+players.get(i).cards.get(1));
			int judge=players.get(0).cards.get(1).compareTo(players.get(1).cards.get(1));
			String name=judge>0 ? players.get(0).name:players.get(1).name;
			//条件语句，相当于if...else
			System.out.println("-----------玩家："+name+"获胜！--------------");
		}
	}

	//展示手牌 
	public void showCards(){
		System.out.println("-----------玩家手牌展示--------------");
		System.out.println(players.get(0)+""+players.get(0).cards);
		System.out.println(players.get(1)+""+players.get(1).cards);
	}

}

PlayCard.java
package com.jiang.cards;

public class PlayCard {
	
	public static void main(String[] args) {
		Game gm=new Game();
		gm.setCards();//获取卡牌
		gm.shuffle();//洗牌
		gm.setPlayers();//获取用户
		gm.dealCards();//发牌
		gm.playCards();//开始游戏
		gm.showCards();//展示卡牌

	}

}