21点游戏java实现

21点的基本知识

21点是世界上比较流行的扑克游戏项目

除掉大小王的一副扑克牌，共计52张牌

21点不区分花色，其中A----10均代表扑克牌本身的点数J Q K代表10点

区分庄家和闲家，其中闲家可以优先要牌 而庄家在与闲家点数一样大的情况下，庄家赢，当有一方点数超过21点则另一方自动获胜，庄家的点数如果正好是21点，那么庄家直接获胜，其他情况以点数大的获胜

流程设计：

人机对战模式！

1由用户输入选择作庄还是作闲，电脑自动成为另一方

2随机为双方发两张牌

3询问闲家是否要牌，一直到闲家不再要或者发生暴点为止

4询问庄家要牌，一直到庄家不再要或者暴点或者正好21点为止

5比较游戏输赢

6询问是否继续

7统计战果

技术问题：

1． 发牌的时候随机发取

2． 发牌出来还要判断是否本张牌已经发过了！如果已经发过了，那么就要重新随机发另外一张牌，要保证牌的唯一性

3． 当给电脑派牌的时候 要考虑AI的问题！让电脑的逻辑稍微模拟人的思维

主类：

import java.util.Scanner;

public class CardTest {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int win = 0;
		int lose = 0;

		while (true) {
			System.out.println("请问做庄家1/闲家2?");
			int num = sc.nextInt();
			if (num == 1) {
				System.out.println("你选择做庄家");

				Ruler r = new Ruler();
				int n=r.play();
				if(n==0) {
					 //庄家赢
					 win++;
				 }
				 else
					 lose++;
			} else if (num == 2) {
				System.out.println("你选择做闲家");
				Player p = new Player();
				 int n= p.play();
				 if(n==1) {
					 //闲家赢
					 win++;

				 }
				 else
					 lose++;
			} else {
				System.out.println("输入错误，重新输入");
			}

			System.out.println("是否继续Y/N");
			if (sc.next().charAt(0) == 'Y')
				continue;
			else {

				System.out.println("游戏结束");
				System.out.println("赢："+win);
				System.out.println("输："+lose);
				break;
			}

		}

	}

}

import java.util.Random;

public class Card {

	int index = 0; // 发牌索引下标
	String[] card = { "红桃A", "红桃2", "红桃3", "红桃4", "红桃5", "红桃6", "红桃7", "红桃8",
             "红桃9", "红桃10", "红桃J", "红桃Q", "红桃K",
             "黑桃A",
			"黑桃2", "黑桃3", "黑桃4", "黑桃5", "黑桃6", "黑桃7", "黑桃8", "黑桃9", "黑桃10", "黑桃J", "黑桃Q", "黑桃K",
			"梅花A", "梅花2", "梅花3",
			"梅花4", "梅花5", "梅花6", "梅花7", "梅花8", "梅花9", "梅花10", "梅花J", "梅花Q", "梅花K", "方片A", "方片2", "方片3", "方片4", "方片5",
			"方片6", "方片7", "方片8", "方片9", "方片10", "方片J", "方片Q", "方片K", };

	public void show() {
		for (int i = 0; i < 52; i++) {
			System.out.println(card[i]);
		}

	}

	// 洗牌，打乱牌的顺序
	public void cutcards() {
		int index=0;
		Random rand = new Random();
		for (int i = 0; i < 52; i++) {
			int n = rand.nextInt(52);
			String temp;
			temp = card[n];
			card[n] = card[51 - n];
			card[51 - n] = temp;
		}

	}

	// 发牌,按顺序发牌，从下标0开始

	public String deal() {
		String c = card[index];
		index++;
		return c;
	}

}

public class JudgeNum {

	public int judgeString(String num) {

		String word= num.substring(2);
		if(word.equals("A")) {
			return  1;

		}
		else if(num.substring(2).equals("J")||
				num.substring(2).equals("Q")||
				num.substring(2).equals("K")||
				num.substring(2).equals("10")) {

			return 10;
		}

		else {
			  int n=(int)num.substring(2).charAt(0)-48;
			return n;
		}

	}

}

import java.util.Random;
import java.util.Scanner;

public class Player {

	/*
	 * 选择做闲家
           先得牌
          您选择: 闲家 
            发牌时间:
            闲家:红桃K 方片3 
            庄家:黑桃6 梅花4
	 *  闲家要牌时间: 
            闲家是否要牌(Y/N)? 
            Y
            发牌:黑桃A
	 * 闲家是否要牌(Y/N)? 
           Y 发牌:梅花5 闲家是否要牌(Y/N)? 
            N 闲家不再要牌:
           闲家点数:19点
            庄家要牌时间: 
            庄家要牌:梅花5
	 * 庄家要牌:黑桃4 
          庄家不再要牌:
          庄家点数19点 庄赢
	 *
	 *
	 *
	 */
    Scanner sc= new Scanner(System.in);

	public int play() {
        int playernum=0;
         int rulernum=0;
		String player1;
		String player2;

		String ruler1;
		String ruler2;

		JudgeNum judge = new JudgeNum();
		Card c = new Card();
		c.cutcards();
		player1 = c.deal();
		player2 = c.deal();

		System.out.println("发牌时间:");
		System.out.println("闲家:" + player1 + " " + player2);
         playernum=judge.judgeString(player1)+judge.judgeString(player2);

		ruler1 = c.deal();
		ruler2 = c.deal();
		System.out.println("庄家:" + ruler1 + " " + ruler2);
		rulernum=judge.judgeString(ruler1)+judge.judgeString(ruler2);
		 System.out.println("闲家点数："+playernum);

		 System.out.println("庄家点数："+rulernum);

		System.out.println("闲家要牌时间： " );

		//循环要牌阶段
		while(true) {
			System.out.println("闲家是否要牌(Y/N)? " );

		   char w = sc.next().charAt(0);
		   if(w=='Y') {
			System.out.println("闲家继续要牌");
			String player3=c.deal();
			System.out.println("闲家: "+player3 );

			playernum=playernum+judge.judgeString(player3);
			 System.out.println("闲家点数："+playernum);
			if(playernum>21)
			{
				System.out.println("闲家爆掉，庄家赢");
				return 0;
			}		

	      }
		   else if(w=='N') {
			   System.out.println("闲家不再要牌，闲家点数:"+playernum);
			   break;
		   }

		}

		System.out.println("庄家要牌时间");

		while(true) {
			if(rulernum>=playernum) {
			System.out.println("庄家不再要牌，庄家赢");
			return 0;
		  }
			else {
				System.out.println("庄家要牌时间：");
				String ruler3=c.deal();
				System.out.println("庄家："+ruler3);
				rulernum=rulernum+judge.judgeString(ruler3);
				if(rulernum>21) {
					System.out.println("庄家点数"+rulernum);
					System.out.println("庄家爆掉，闲家赢");
					return 1;
				}
				else if(rulernum>=playernum) {

					System.out.println("庄家点数:"+rulernum+" 闲家点数:"+playernum);
					System.out.println("庄家赢");
					return 0;
				}

			}

		}

	}

}

import java.util.Scanner;

public class Ruler {

	// 选择做庄家
	/*
	 * 闲家先要牌
	 *
	 */

	Scanner sc = new Scanner(System.in);

	public int play() {
		int playernum = 0;
		int rulernum = 0;
		String player1;
		String player2;

		String ruler1;
		String ruler2;

		JudgeNum judge = new JudgeNum();
		Card c = new Card();
		c.cutcards();
		player1 = c.deal();
		player2 = c.deal();

		System.out.println("发牌时间:");
		System.out.println("闲家:" + player1 + " " + player2);
		playernum = judge.judgeString(player1) + judge.judgeString(player2);

		ruler1 = c.deal();
		ruler2 = c.deal();
		System.out.println("庄家:" + ruler1 + " " + ruler2);
		rulernum = judge.judgeString(ruler1) + judge.judgeString(ruler2);
		System.out.println("闲家点数：" + playernum);

		System.out.println("庄家点数：" + rulernum);

		System.out.println("闲家要牌时间：");

		while (true) {
			String player3;
			if (playernum <rulernum) {
				System.out.println("闲家要牌");
				player3 = c.deal();
				System.out.println("闲家:" + player3);
				playernum = playernum + judge.judgeString(player3);
			} else if (playernum > 21) {
				System.out.println("闲家点数：" + playernum);

				System.out.println("闲家爆掉，庄家赢");
				return 0;

			} else if (playernum >= 15) {
				System.out.println("闲家不再要牌");
				System.out.println("闲家点数" + playernum);
				break;

			}else {

				System.out.println("闲家要牌");
				String player4 = c.deal();
				System.out.println("闲家:" + player4);

				playernum=playernum+judge.judgeString(player4);

				 if (playernum > 21) {
						System.out.println("闲家点数：" + playernum);

						System.out.println("闲家爆掉，庄家赢");
						return 0;
			}

		}
	}

		// 庄家要牌时间
		System.out.println("庄家要牌时间：");

		while (true) {
			System.out.println("庄家是否要牌(Y/N)");
			char w = sc.next().charAt(0);
			if (w == 'Y') {
				System.out.println("庄家继续要牌");
				String ruler3 = c.deal();
				System.out.println("庄家: " + ruler3);

				rulernum = rulernum + judge.judgeString(ruler3);
				System.out.println("庄家点数：" + rulernum);
				if (rulernum > 21) {
					System.out.println("庄家爆掉，闲家赢");
					return 1;
				}

			} else if (w == 'N') {
				System.out.println("庄家不再要牌，庄家点数:" + rulernum);
				break;
			}

		}

		if (rulernum >= playernum) {
			System.out.println("庄家赢");
			return 0;
		} else {

			System.out.println("闲家赢");

			return 1;
		}

	}

}