import java.util.Random;
/**
* 验证码
* @author Administrator
*
*/
public class CheckCode {
public static void main(String[] args) {
System.out.println(RandomCheckCode.getCode());
}
}
class RandomCheckCode{
//生成五位验证码
public static String getCode(){
char []cs = {'A','B','C','D','E','F','G','1','2','3','4','5','6','7','8','9','0'};
//下标
int count = 0;
//随机数
Random random = new Random();
//动态的字符数组:用数组存储 然后遍历
StringBuilder sb = new StringBuilder();
while (true) {
char c = cs[random.nextInt(cs.length)];
if (sb.indexOf(c+"")==-1) {
sb.append(c);
count++;
if (count==5) {
break;
}
}
}
return sb.toString();
}
}
