package ink.wgink.util.verification.code;

import java.util.Random;

/**
 * When you feel like quitting. Think about why you started
 * 当你想要放弃的时候，想想当初你为何开始
 *
 * @ClassName: Randoms
 * @Description: 随机数
 * @Author: WangGeng
 * @Date: 2019/9/26 9:18 下午
 * @Version: 1.0
 **/
public class Randoms {

    private static final Random RANDOM = new Random();
    /**
     * 定义验证码字符.去除了O和I等容易混淆的字母
     */
    public static final char[] ALPHA = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'G', 'K', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
            , 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '2', '3', '4', '5', '6', '7', '8', '9'};

    /**
     * 产生两个数之间的随机数
     *
     * @param min 小数
     * @param max 比min大的数
     * @return int 随机数字
     */
    public static int num(int min, int max) {
        return min + RANDOM.nextInt(max - min);
    }

    /**
     * 产生0--num的随机数,不包括num
     *
     * @param num 数字
     * @return int 随机数字
     */
    public static int num(int num) {
        return RANDOM.nextInt(num);
    }

    public static char alpha() {
        return ALPHA[num(0, ALPHA.length)];
    }
}
