使用LinkedList模拟洗牌功能

package cn.itcast.collection;

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

/*使用LinkedList模拟洗牌功能*/

//扑克牌类
class Poker {
    String color;// 花色
    String num;// 点数

    public Poker(String color, String num) {
        this.color = color;
        this.num = num;
    }

    @Override
    public String toString() {
        return "{" + color + num + "}";
    }

}

public class Demo3 {

    public static void main(String[] args) {
        LinkedList poker = createPoker();
        shufflePoker(poker);
        showPoker(poker);

    }

    // 洗牌功能
    public static void shufflePoker(LinkedList poker) {
        // 创建随机数
        Random random = new Random();
        for (int i = 0; i < 100; i++) {
            // 随机产生2个索引值，并交换两张牌的顺序
            int index1 = random.nextInt(poker.size());
            int index2 = random.nextInt(poker.size());

            Poker poker1 = (Poker) poker.get(index1);
            Poker poker2 = (Poker) poker.get(index2);
            poker.set(index1, poker2);
            poker.set(index2, poker1);
        }
    }

    // 生产扑克牌
    public static LinkedList createPoker() {
        String[] strColor = new String[] { "黑桃", "红桃", "梅花", "方块" };
        String[] strNum = new String[] { "A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K" };
        LinkedList list = new LinkedList();
        for (int i = 0; i < strColor.length; i++) {
            for (int j = 0; j < strNum.length; j++) {
                list.add(new Poker(strColor[i], strNum[j]));
            }
        }
        return list;
    }

    // 显示扑克牌
    public static void showPoker(LinkedList list) {
        for (int i = 0; i < list.size(); i++) {
            System.out.print(list.get(i));
            if (i % 10 == 9) {
                System.out.println();
            }
        }
    }

}