利用LinkedList生成一副扑克牌

import java.util.LinkedList;
import java.util.Random;

//自定义一个Poker类，用于存储扑克的信息（花色、数字）
class Poker{
    String color;
    String numbers;
    
    public Poker(String color, String numbers) {
        this.color = color;
        this.numbers = numbers;
    }
    
    //重写toString方法
    @Override
    public String toString() {
        return color + numbers;
    }
        
}


public class Demo3 {
    public static void main(String[] args) {
        LinkedList pokers = CreatePoker();
        shufflePoker(pokers);
        showPoker(pokers);
    }
    
    //生成一副扑克牌
    public static LinkedList CreatePoker(){
        LinkedList list = new LinkedList();
        String[] color = {"红桃","黑桃","梅花","方块"};
        String[] numbers = {"A","2","3","4","5","6","7","8","9","10","J","Q","K"};
        for (int i = 0; i < numbers.length; i++) {
            for (int j = 0; j < color.length; j++) {
                list.add(new Poker(color[j], numbers[i]));
            }
        }
        return list;
    }
    
    //将扑克牌信息打印
    public static void showPoker(LinkedList pokers){
        for (int i = 0; i < pokers.size(); i++) {
            System.out.print(pokers.get(i) + " ");
            //为什么等于9？因为等于0的话，i为0时，直接换行打印。等于9是0 ~ 9，就是每十张牌变换行一次
            if(i % 10 == 9){
                System.out.println();
            }
        }
    }
    
    //洗牌
    public static void shufflePoker(LinkedList pokers){
        Random random = new Random();
        for (int i = 0; i < 100; i++) { //i < 10也行，只不过原则上越大，牌洗得越乱
            int index1 = random.nextInt(pokers.size());
            int index2 = random.nextInt(pokers.size());
            Poker poker1 = (Poker) pokers.get(index1); 
            Poker poker2 = (Poker) pokers.get(index2);
            pokers.set(index1, poker2);
            pokers.set(index2, poker1);
        }
    }
}