java随机生成6位数字字符数组

package com.system.oss.common.util;
/**
 * 动态生成随机字符数组
 * 
 * @author 苏持恒
 */
public class ShortMessageCodeUntil
{

    /**
     * 随机生成4位数字字符数组
     * 
     * @return rands
     */
    public static char[] generateCheckCode()
    {
        String chars = "0123456789";
        char[] rands = new char[4];
        for (int i = 0; i < 4; i++)
        {
            int rand = (int) (Math.random() * 10);
            rands[i] = chars.charAt(rand);
        }
        return rands;
    }

    /**
     * 随机生成6位数字字符数组
     * 
     * @return rands
     */
    public static char[] generateCheckPass()
    {
        String chars = "0123456789";
        char[] rands = new char[6];
        for (int i = 0; i < 6; i++)
        {
            int rand = (int) (Math.random() * 10);
            rands[i] = chars.charAt(rand);
        }
        return rands;
    }

}