package com.Test3;
import java.util.Random;
public class Test {
public static void main(String[] args) {
String dates="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
Random r=new Random();
String code="";
//产生一个五位的验证码
for (int i = 0; i <5 ; i++) {
//随机产生一个索引
int index = r.nextInt(dates.length());
//根据索引获取字符
char c = dates.charAt(index);
//字符拼接
code+=c;
}
System.out.println(code);
}
}
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