Java 常用类库 之 Random 随机数类实例

http://www.verejava.com/?id=169931132381103

/**
    知识点：Random 随机数类

    实际应用: 敌人飞机随机从屏幕的上方出现
*/
import java.util.*;
public class TestRandomCard
{
    public static void main(String[] args)
    {
        String[] cards={"A","A","A","A",
                      "2","2","2","2",
                      "3","3","3","3",
                      "4","4","4","4",
                      "5","5","5","5",
                      "6","6","6","6",
                      "7","7","7","7",
                      "8","8","8","8",
                      "9","9","9","9",
                      "10","10","10","10",
                      "J","J","J","J",
                      "Q","Q","Q","Q",
                      "K","K","K","K",
                      "小王","大王"
                    };
        System.out.println("原牌:");
        for(int i=0;i<cards.length;i++)
        {
            System.out.print(cards[i]+",");
        }

        //随机打乱
        Set set=new HashSet();
        Random rn=new Random();
        while(true)
        {
            set.add(rn.nextInt(54));
            if(set.size()==54)
            {
                break;
            }
        }
        System.out.println("\n54个随机索引号:");
        Object[] iter=set.toArray();
        for(int i=0;i<iter.length;i++)
        {
            System.out.print(iter[i]+",");
        }

        List zhanshan=new ArrayList();
        List lisi=new ArrayList();
        List wangwu=new ArrayList();

    }
}

http://www.verejava.com/?id=169931132381103

原文地址：https://www.cnblogs.com/verejava/p/9216606.html