课后3

import java.util.Random;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String yanzhengma = generateyanzhengma();
System.out.println("验证码：" + yanzhengma);
String input = scanner.nextLine();
if (input.equals(yanzhengma)) {
System.out.println("成功");
} else {
System.out.println("失败");
}
}
private static String generateyanzhengma() {
Random random = new Random();
StringBuilder sb = new StringBuilder();
String chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
for (int i = 0; i < 6; i++) {
int index = random.nextInt(chars.length());
sb.append(chars.charAt(index));
}
return sb.toString();
}
}