Java 常用类库 之 Random 随机数类

http://www.verejava.com/?id=169931089810102

import java.util.Random;
public class TestRandom
{
    public static void main(String[] args)
    {
        //实例化随机数对象
        Random rn=new Random();
        for(int i=0;i<10;i++)
        {
            System.out.println(rn.nextInt(10));
        }
    }
}


//随机数产生验证码
public class Test {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // char[] chars={'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
        Random rn=new Random();
        for(int i=0;i<10;i++)
        {
            System.out.println(rn.nextInt());
        }
        
        //产生 [0 - 10) 之间的随机数
        for(int i=0;i<10;i++)
        {
            System.out.print(rn.nextInt(10)+",");
        }
        
        char[] chars={'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
        String validCode="";
        for(int i=0;i<6;i++)
        {
            validCode+=chars[rn.nextInt(26)]; //[0 - 26)
        }
        
        System.out.println("产生的随机数："+validCode);
    }
}

http://www.verejava.com/?id=169931089810102