我遇到的问题是我无法让我的密码验证程序检查一个字符串以确保其中 1 个字符是大写的,一个是小写的,它将检查整个字符串中的一个其他并根据它正在检查的语句打印错误消息。
我查看了这个网站和互联网寻找答案,但我找不到答案。这是家庭作业。
以下是我当前的代码。
import java.util.Scanner;
public class password
{
public static void main(String[] args)
{
Scanner stdIn = new Scanner(System.in);
String password;
String cont = "y";
char ch;
boolean upper = false;
boolean lower = false;
System.out.println("Setting up your password is easy. To view requirements enter Help.");
System.out.print("Enter password or help: ");
password = stdIn.next();
ch = password.charAt(0);
while (cont.equalsIgnoreCase("y"))
{
while (password.isEmpty())
{
System.out.print("Enter password or help: ");
password = stdIn.next();
}
if (password.equalsIgnoreCase("help"))
{
System.out.println("Password must meet these requirements." +
"\nMust contain 8 characters.\nMust contain 1 lower case letter." +
"\nMust contain 1 upper case letter.\nMust contain 1 numeric digit." +
"\nMust contain 1 special character !@#$%^&*\nDoes not contain the word AND or NOT.");
password = "";
}
else if (password.length() < 8)
{
System.out.println("Invalid password - Must contain 8 charaters.");
password = "";
}
else if (!(Character.isLowerCase(ch)))
{
for (int i=1; i<password.length(); i++)
{
ch = password.charAt(i);
if (!Character.isLowerCase(ch))
{
System.out.println("Invalid password - Must have a Lower Case character.");
password = "";
}
}
}
else if (!(Character.isUpperCase(ch)))
{
for (int i=0; i<password.length(); i++)
{
ch = password.charAt(i);
if (!Character.isUpperCase(ch))
{
System.out.println("Invalid password - Must have an Upper Case character.");
password = "";
}
}
}
else
{
System.out.println("Your password is " + password);
System.out.print("Would you like to change your password? Y/N: ");
cont = stdIn.next();
password = "";
}
while (!cont.equalsIgnoreCase("y") && !cont.equalsIgnoreCase("n"))
{
System.out.print("Invalid Answer. Please enter Y or N: ");
cont = stdIn.next();
}
}
}
}