Password validate 8 digits, contains upper, lowercase, and a special character

Question

So I wrote a method that makes the user enter a password and this password must pass the following specs:

1. Be at least 8 digits long

2. Have an uppercase

3. Have a lowercase

4. Have special digit

I'm not sure as to why when I input it, the output doesn't account for the special Character and throws an error.

Here is my code so far:

public static void main(String[] args) {

    Scanner in = new Scanner(System.in);
    System.out.print("Please enter a given  password : ");
    String passwordhere = in.nextLine();
    System.out.print("Please re-enter the password to confirm : ");
    String confirmhere = in.nextLine();
    System.out.println("your password is: " + passwordhere);

    while (!passwordhere.equals(confirmhere) || !isValid(passwordhere)) {
        System.out.println("The password entered here  is invalid");
        System.out.print("Please enter the password again.it must be valid : ");
        String Passwordhere = in.nextLine();
        System.out.print("Please re-enter the password to confirm : ");

    }
}

public static boolean isValid(String passwordhere) {

    if (passwordhere.length() < 8) {
        return false;
    } else {

        for (int p = 0; p < passwordhere.length(); p++) {
            if (Character.isUpperCase(passwordhere.charAt(p))) {
            }
        }
        for (int q = 0; q < passwordhere.length(); q++) {
            if (Character.isLowerCase(passwordhere.charAt(q))) {
            }
        }
        for (int r = 0; r < passwordhere.length(); r++) {
            if (Character.isDigit(passwordhere.charAt(r))) {
            }
        }
        for (int s = 0; s < passwordhere.length(); s++) {
            if (Character.isSpecialCharacter(passwordhere.charAt(s))) {
            } 
            }
            return true;
        }
}

Also, another problem is for example, lets say the user enter bob123 as their password.

How can I get the loop to tell the user what It needs to be a correct password?

On the example above it is missing a Capital Letter and a symbol(*&^..etc).

How can I add this to print out each time the user makes a password and until they get the right password to pass all specs of the code?

Answer 1

You should have clearly mention your requirement I was not aware of your requirement. Please find my below solution`

public static void main(String[] args) {

    Scanner in = new Scanner(System.in);
    System.out.print("Please enter a given  password : ");
    String passwordhere = in.nextLine();
    System.out.print("Please re-enter the password to confirm : ");
    String confirmhere = in.nextLine();

    List<String> errorList = new ArrayList<String>();

    while (!isValid(passwordhere, confirmhere, errorList)) {
        System.out.println("The password entered here  is invalid");
        for (String error : errorList) {
            System.out.println(error);
        }

        System.out.print("Please enter a given  password : ");
        passwordhere = in.nextLine();
        System.out.print("Please re-enter the password to confirm : ");
        confirmhere = in.nextLine();
    }
    System.out.println("your password is: " + passwordhere);

}

public static boolean isValid(String passwordhere, String confirmhere, List<String> errorList) {

    Pattern specailCharPatten = Pattern.compile("[^a-z0-9 ]", Pattern.CASE_INSENSITIVE);
    Pattern UpperCasePatten = Pattern.compile("[A-Z ]");
    Pattern lowerCasePatten = Pattern.compile("[a-z ]");
    Pattern digitCasePatten = Pattern.compile("[0-9 ]");
    errorList.clear();

    boolean flag=true;

    if (!passwordhere.equals(confirmhere)) {
        errorList.add("password and confirm password does not match");
        flag=false;
    }
    if (passwordhere.length() < 8) {
        errorList.add("Password lenght must have alleast 8 character !!");
        flag=false;
    }
    if (!specailCharPatten.matcher(passwordhere).find()) {
        errorList.add("Password must have atleast one specail character !!");
        flag=false;
    }
    if (!UpperCasePatten.matcher(passwordhere).find()) {
        errorList.add("Password must have atleast one uppercase character !!");
        flag=false;
    }
    if (!lowerCasePatten.matcher(passwordhere).find()) {
        errorList.add("Password must have atleast one lowercase character !!");
        flag=false;
    }
    if (!digitCasePatten.matcher(passwordhere).find()) {
        errorList.add("Password must have atleast one digit character !!");
        flag=false;
    }

    return flag;

}