怎么抛出自定义异常类中内部异常类？

Question

问题在代码中已标出，请大婶解疑，能不能这样做，这样做能不能实现

import javax.swing.JOptionPane;

public class PasswdException extends Exception {
PasswdException(int i) {
if (i < 6) {
System.out.println("密码不能小于六位");
}
if (i > 6) {
System.out.println("密码不能大于六位");
}

}
//内部类
public class PasswdExceptionisnum {
    PasswdExceptionisnum(String j) {
        try {
            Integer.parseInt(j);
        } catch (NumberFormatException e) {
            System.out.println("不是数字" + e);
        }
    }

}

}

class Passwd {
public static boolean checkpasswd(String passwd) throws PasswdException {
if (passwd.length() == 6) {
return true;
} else
throw new PasswdException(passwd.length());
if (passwd != null) {
//问题在下一行，请问怎么实现下一行效果
throw new PasswdException.PasswdExceptionisnum(passwd);
//上面一行行错误，这里想抛出PasswdExceptionisnum内部类
}
}

public static void main(String args[]) {
    try {
        String passwd = JOptionPane.showInputDialog(" 请设置初始密码");
        checkpasswd(passwd);
        System.out.println("密码已经设置");
    } catch (PasswdException e) {
        System.out.println(e);
    } finally {
        System.out.println("程序结束");
    }
}

}

Answer 1

必须使用外部类对象来创建内部类对象
PasswdException p=new PasswdException()
throw p.new PasswdExceptionisnum(passwd)