import java.util.LinkedList;

import java.util.Random;

class Poker{

    String color;//花色

    String  num;//数字

    public Poker(String color,String num){

        this.color = color;

        this.num = num;

    }

    @Override

    public String toString() {

        // TODO Auto-generated method stub

        return "{"+color+num+"}";

    }

}

public class HomeWork3 {

    /**

     * @param args

     * 用LinkdeList实现52张扑克牌(不含大小王)的洗牌功能。

     * 提示：花色 ，和数字分别用数组存储。

     */

    public static void main(String[] args) {

        // TODO Auto-generated method stub

       // 1.创建扑克牌

        LinkedList list = creatPoker();

        //2.洗牌

        shufflePoker(list);

        //3.显示

        showPoker(list);

        //4.发牌的功能。

    }

    //洗牌的功能

    public static void shufflePoker(LinkedList poker){

        //1.产生一个随机数

        Random rangdom =  new  Random();

        for(int i = 0 ;i<100;i++){

            //随机获取两个索引值：

            int index1 = rangdom.nextInt(poker.size());

            int index2 = rangdom.nextInt(poker.size());

            Poker p1 = (Poker) poker.get(index1);

            Poker p2 = (Poker) poker.get(index2);

            //交换用set方法

            poker.set(index1, p2);

            poker.set(index2, p1);

        }

    }

    public static void showPoker(LinkedList list){

        for(int i = 0;i<list.size();i++){

            System.out.print(list.get(i));

            if( i % 13 == 12){

                System.out.println();

            }

        }

    }

    public static LinkedList creatPoker(){

        //创建集合对象用来存放扑克牌

        LinkedList list = new LinkedList();

        //定义花色和数字

        String[] colors = {"黑桃","红桃","方块","梅花"};

        String[] nums = {"A","2","3","4","5","6","7","8","9","10","J","Q","K"};

        for(int i = 0 ;i<nums.length ;i++){

            for(int j = 0;j<colors.length;j++){

                list.add(new Poker(colors[j], nums[i]));

            }

        }

        return list;

    }

}