博客

package list;

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

@SuppressWarnings("unused")
class Poker{

    String id;

    String name;

    public Poker(String id,String name){
        super();
        this.id = id;
        this.name = name;
    }

    public String toString(){
        return "{"+ this.name + this.id + "}";
    }


}

public class demo6{

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static void main(String[] args) {

        LinkedList pokers = createPoker();
        shufflePoker(pokers);
        showPoker(pokers);
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static LinkedList createPoker(){
        LinkedList list = new LinkedList();
        String[] colors = {"黑桃","红桃","梅花","方块"};
        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(nums[i],colors[j]));
            }
        }
        return list;
    }

    public static void shufflePoker(LinkedList<Object> pokers){
        //创建随机数对象
        Random random = new Random();
        for(int i = 0 ; i <100; i++){ 
            //随机产生两个索引值
            int index1 = random.nextInt(pokers.size());
            int index2 = random.nextInt(pokers.size());
            //根据索引值取出两张牌，然后交换两张牌的顺序
            Poker poker1 = (Poker) pokers.get(index1);
            Poker poker2 = (Poker) pokers.get(index2);
            pokers.set(index1, poker2);
            pokers.set(index2, poker1);
        }

    }

    public static void showPoker(LinkedList<Object> pokers){
        for(int i = 0 ; i<pokers.size() ; i++){
            System.out.print(pokers.get(i));
            //换行
            if(i%10==9){
                System.out.println();
            }
        }
    }


}