LinkedList存储一副扑克牌，实现洗牌功能。

package cd.itcast.runble;

import java.util.LinkedList;

import java.util.Random;

/**

 * LinkedList存储一副扑克牌，实现洗牌功能。

 * @author 甘兴瑞

 *    2016/11/8

 */

class Poker{

    String huase;

    String num;

    public Poker(String huase, String num) {

        this.huase = huase;

        this.num = num;

    }

    @Override

    public String toString() {

        return "{"+huase +num+"}";

    }

}

public class Demo2 {

    public static void main(String[] args) {

        LinkedList list2=createPoker();

        xiPoker(list2);//既可以返回linkedList，也可以不反回，使用void，因为共享对象。

        showPoker(list2);

    }

    public static LinkedList createPoker() {

        //存扑克的

                LinkedList list=new LinkedList();

                String[] arr1={"红桃","黑桃","方片","梅花"};

                String[] arr2={"A","2","3","4","5","6","7","8","9","10","J","Q","K"};

                for(int i=0;i<arr1.length;i++){

                    for(int j=0;j<arr2.length;j++){

                        Poker poker=new Poker(arr1[i],arr2[j]);

                        list.add(poker);

                    }

                }

                return list;

    }

    //显示扑克牌

    public static void showPoker(LinkedList pokers) {

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

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

            if(i%13==12){

                System.out.println();

            }

        }

    }

    //洗牌的功能

    public static void xiPoker(LinkedList Pokers) {

        //创建随机数对象

        Random ran = new Random();

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

            int index1 = ran.nextInt(Pokers.size());

            int index2 = ran.nextInt(Pokers.size());

            Poker poker1 = (Poker)Pokers.get(index1);

            Poker poker2 = (Poker)Pokers.get(index2);

            Pokers.set(index1, poker2);

            Pokers.set(index2, poker1);

        }

    }

}