public class Homework09 {public static void main(String[] args) {String name = "jack";String pwd = "123456";String email = "ll@";try {userRegister(name, pwd, email);System.out.println("恭喜你注册成功");} catch (RuntimeException e) {System.out.println(e.getMessage());}}public static void userRegister(String name, String password, String email) {if (!(name != null && password != null && email != null)) {throw new RuntimeException("参数不能为空");}// 针对输入的内容进行校验// 用户名校验 用户名长度在2~4之间if (!(name.length() >= 2 && name.length() <= 4)) {throw new RuntimeException("用户名长度不对");}// 密码校验 密码长度是6位,并且全是数字if (!(password.length() == 6 && isDigital(password))) {throw new RuntimeException("密码的长度要为6,并且全是数字");}// 邮箱 @ 要在 . 之前// 找不到指定字符会返回-1int i = email.indexOf('@');int i2 = email.indexOf(".");if (!(i > 0 && i2 > i)) {throw new RuntimeException("邮箱格式错误");}}// 验证字符串是否由0~9组成public static boolean isDigital(String password) {char[] chars = password.toCharArray();for (char aChar : chars) {if (aChar < '0' || aChar > '9') {return false;}}return true;}}
