Basic Password Verifier
 

Hey there, this is my first post here and I'm in the need of some real help.


I've written a basic password verifier, which checks to see if what you type in is the same as the default stored password, but i continually get a compile error.

import java.util.Scanner;



public class PasswordVerifier

{

        public static boolean isValid(String userPass)

                {

                        /**

                         * This is the default stored password

                         */

                        

                        // Password stored by default is "cool"

                        

                        boolean goodSoFar = true; // Flag

                        int index = 0;                                  // Loop control variable

                        

                        // Is the string the correct length?

                        if (userPass.length() != 4)

                                goodSoFar = false;

                                

                                

                        // Test to see if the characters match the password

                        while (goodSoFar && index < 4)

                        {

                                if (!Character(userPass.charAt(index == 'c')))

                                        goodSoFar = false;

                                index++;

                                if (!Character(userPass.charAt(index == 'o')))

                                        goodSoFar = false;

                                index++;

                                if (!Character(userPass.charAt(index == 'o')))

                                        goodSoFar = false;

                                index++;

                                if (!Character(userPass.charAt(index == 'l')))

                                        goodSoFar = false;there 

                                index++;

                        

                        //results are returned

                        return goodSoFar;

                }

}

}

And then here is my driver class

import java.util.Scanner;

 

public class PasswordDriver

{



public static void main(String[] args)

{

        PasswordVerifier PW = new PasswordVerifier();

        String user; // To hold a user pass

        

        

        while(user != "")

                {

                        System.out.println("Please enter a password containing letters and lowercase only, or nothing to end");

                        //create a scanner object

                        Scanner keyboard = new Scanner(System.in);

                        

                        //get user pass

                        user = keyboard.nextLine();

                        

                        //Determine if the password is valid.

                        if (PW(user))

                                {

                                        System.out.println("That is a valid password");

                                }

                        else

                                {

                                        System.out.println("That is not the proper password or format");

                                        System.out.println("Here is an example: cool");

                                }

                }

}

}

The error i get when I'm compiling is

PasswordVerifier.java:30: charAt(int) in java.lang.String cannot be applied to (boolean)
if (!Character(userPass.charAt(index == 'c')))
^
PasswordVerifier.java:33: charAt(int) in java.lang.String cannot be applied to (boolean)
if (!Character(userPass.charAt(index == 'o')))
^
PasswordVerifier.java:36: charAt(int) in java.lang.String cannot be applied to (boolean)
if (!Character(userPass.charAt(index == 'o')))
^
PasswordVerifier.java:39: charAt(int) in java.lang.String cannot be applied to (boolean)
if (!Character(userPass.charAt(index == 'l')))



could someone please help me out, i've tried multiple variances and fixes, but alas... none work for me. Thanks everyone!

Re: Basic Password Verifier
 

it needs to be changed to this format

if (userPass.charAt(index) == 'c')

but you are making it hard, you can do this

if(userPass.startsWith("cool")){

return false;

}

Re: Basic Password Verifier
 

startsWith? so "coolblahblahblah" will be true too? not sure that sounds totally secure, but yeah, the compiler error is as stated above.

Re: Basic Password Verifier
 

I think you have misplaced the parenthesis:

This:
if (!Character(userPass.charAt(index == 'c')))

Should be:
if (!Character(userPass.charAt(index) == 'c'))

You could also try:

goodSoFar = userPass.equals("cool");

return goodSoFar;

Re: Basic Password Verifier
 

lol i don't think checking if the password contains c o o l, was too secure, thats why i made the post

Re: Basic Password Verifier
 

thanks dickersonka... that fixed the compile issue for the constructor, but in the drive i'm now getting the following error, yet i see nothing wrong =\


symbol : method PW(java.lang.String)
location: class PasswordDriver
if (PW(user))

Re: Basic Password Verifier
 

You already have the "PasswordVerifier" so you now want to use the methods within it.

PW.isValid(user)

Re: Basic Password Verifier
 

wow ... and to think I thought the .equals(..) method worked great :)