JAVA生成指定长度的随机验证码

package cn;

import java.util.Random;

/**
 * @author yeqv
 * @program A2
 * @Classname a2
 * @Date 2022/1/14 21:40
 * @Email w16638771062@163.com
 */

public class a2 {//随机生成指定长度的验证码

    public static void main(String[] args) {
        a2 abc = new a2();
        String c = abc.abcd(8);
        System.out.println(c);
    }

    public String abcd(int n) {
        String a = "asdasdkljasildujqwioyunhnmbw";
        Random random = new Random();
        StringBuilder builder = new StringBuilder(6);
        for (int i = 0; i < n; i++) {
            builder.append(a.charAt(random.nextInt(a.length())));

        }
        return builder.toString();

    }
}