Java实战练习之扑克牌魔术

前言

用到了Scanner，for循环，if-else语句，集合，线程的Thread.sleep()方法

话不多说，直接上代码

代码

import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class CardMagic {
    public static void main(String[] args) {

        //1.准备54张牌
        //新建一个集合存储54张牌并打乱顺序
        ArrayList<String> pokers = new ArrayList<>();
        //直接定义两个数组并赋值，一个存四种花色，一个存13张牌的值（3，4，5，6，7，8，9，10，J，Q，K，A，2）
        String[] kind = {"♥","♠","♦","♣"};
        String[] number = {"3","4","5","6","7","8","9","10","J","Q","K","A","2"};
        //先存大王小王到pokers集合中
        pokers.add("大王");
        pokers.add("小王");
        //组装两个集合的数据，生成带花色的52张牌（可以用普通for循环，也可以用增强for循环foreach）
        for (int i = 0; i < kind.length; i+  +) {
            for (int j = 0; j < 13; j++) {
                pokers.add(kind[i]+number[j]);
            }

        }
        System.out.println("这里有54张牌："+pokers);//顺序打印
        //洗牌--打乱pokers集合里的元素顺序
        Collections.shuffle(pokers);//打乱顺序
        //再新建一个集合，用来存储随机拿出的21张牌(伪随机：其实是拿出前21张牌，但是pokers集合是随机打乱顺序的，所以每次运行程序，拿出的前21张牌也就不一样且乱序了)
        ArrayList<String> list21 = new ArrayList<>();
        for (int i = 0; i < 21; i++) {
            list21.add(pokers.get(i));
        }

        //打印出这21张牌
        System.out.println("随机取出21张扑克牌并打乱顺序：");
        System.out.println(list21);
        System.out.println("请选择任意一张扑克牌，并记住它。【输入小写字母'y'继续,输入其他任意字符结束游戏！】");
        Scanner scanner1 = new Scanner(System.in);

        if (scanner1.nextLine().equals("y")){
            System.out.println("系统将这21张扑克牌均分为3叠，请等待...");
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }else {
            System.exit(-1);
        }

        //定义3个集合，每个集合存储7张牌
        ArrayList<String> card1 = new ArrayList<>();
        ArrayList<String> card2 = new ArrayList<>();
        ArrayList<String> card3 = new ArrayList<>();

        for (int i = 0; i < 7; i++) {
            card1.add(list21.get(i));
        }
        for (int i = 7; i < 14; i++) {
            card2.add(list21.get(i));
        }
        for (int i = 14; i < 21; i++) {
            card3.add(list21.get(i));
        }

        System.out.println("第1叠："+card1);
        System.out.println("第2叠："+card2);
        System.out.println("第3叠："+card3);

        //判断输入
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        Scanner scanner2 = new Scanner(System.in);
        System.out.println("请告诉我你记住的牌在第几叠~如果在第1叠请输入数字1；如果在第2叠请输入数字2；如果在第3叠请输入数字3");
        System.out.println("请输入:");
        //新建3个数组，分3次重新存重新按指定规则排序的21张牌
        ArrayList<String> list21New1 = new ArrayList<>();
        int a = scanner2.nextInt();

        if (a==1){
            for (int i = 0; i < 7; i++) {
                list21New1.add(card2.get(i));

            }
            for (int i = 0; i < 7; i++) {
                list21New1.add(card1.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New1.add(card3.get(i));
            }
        }else if (a==2){
            for (int i = 0; i < 7; i++) {
                list21New1.add(card1.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New1.add(card2.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New1.add(card3.get(i));
            }
        }else {
            for (int i = 0; i < 7; i++) {
                list21New1.add(card1.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New1.add(card3.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New1.add(card2.get(i));
            }
        }

        card1.clear();
        card2.clear();
        card3.clear();
        for (int i = 0; i < 21; i++) {
            card1.add(list21New1.get(i));
            i++;
            card2.add(list21New1.get(i));
            i++;
            card3.add(list21New1.get(i));
        }
        System.out.println("第1叠："+card1);
        System.out.println("第2叠："+card2);
        System.out.println("第3叠："+card3);

        //判断输入
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        Scanner scanner3 = new Scanner(System.in);
        System.out.println("请告诉我你记住的牌在第几叠~如果在第1叠请输入数字1；如果在第2叠请输入数字2；如果在第3叠请输入数字3");
        System.out.println("请输入:");
        int b = scanner3.nextInt();
        //新建3个数组，分3次重新存重新按指定规则排序的21张牌
        ArrayList<String> list21New2 = new ArrayList<>();
        if (b==1){
            for (int i = 0; i < 7; i++) {
                list21New2.add(card2.get(i));

            }
            for (int i = 0; i < 7; i++) {
                list21New2.add(card1.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New2.add(card3.get(i));
            }
        }else if (b==2){
            for (int i = 0; i < 7; i++) {
                list21New2.add(card1.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New2.add(card2.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New2.add(card3.get(i));
            }
        }else {
            for (int i = 0; i < 7; i++) {
                list21New2.add(card1.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New2.add(card3.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New2.add(card2.get(i));
            }
        }

        card1.clear();
        card2.clear();
        card3.clear();
        for (int i = 0; i < 21; i++) {
            card1.add(list21New2.get(i));
            i++;
            card2.add(list21New2.get(i));
            i++;
            card3.add(list21New2.get(i));
        }
        System.out.println("第1叠："+card1);
        System.out.println("第2叠："+card2);
        System.out.println("第3叠："+card3);

        //判断输入
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        Scanner scanner4 = new Scanner(System.in);
        System.out.println("请告诉我你记住的牌在第几叠~如果在第1叠请输入数字1；如果在第2叠请输入数字2；如果在第3叠请输入数字3");
        System.out.println("请输入:");

        //新建3个数组，分3次重新存重新按指定规则排序的21张牌
        ArrayList<String> list21New3 = new ArrayList<>();
        int c = scanner2.nextInt();
        if (c==1){
            for (int i = 0; i < 7; i++) {
                list21New3.add(card2.get(i));

            }
            for (int i = 0; i < 7; i++) {
                list21New3.add(card1.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New3.add(card3.get(i));
            }
        }else if (c==2){
            for (int i = 0; i < 7; i++) {
                list21New3.add(card1.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New3.add(card2.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New3.add(card3.get(i));
            }
        }else {
            for (int i = 0; i < 7; i++) {
                list21New3.add(card1.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New3.add(card3.get(i));
            }
            for (int i = 0; i < 7; i++) {
                list21New3.add(card2.get(i));
            }
        }

        System.out.println("好了，稍等片刻！让我猜猜你记住的是什么牌......");
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("真相永远只有一个,你选的牌是"+list21New3.get(10)+"!");
        System.out.println("什么？你说我是运气好？不！这是“魔法”！");
    }
}

运行结果

其中一次运行结果：开始我记住的就是梅花K！

魔术表演步骤

值得一提的是，将21张扑克牌分成3组的具体操作，应该是：

将21张扑克牌拿在手上，按顺序，从左到右依次发牌，每发3次算一轮，一共发七轮，发完就会产生3叠牌，每叠7张！

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