Question

•Write a JAVA program to check a given password strength from a user's input.

•Create a method to check the number of characters. It must be more than 8.

•Create a method to check the password to have at least one uppercase letter.

•Create a method to check the password to have at least one lowercase letter.

•Create a method to check the password to have at least one digit.

•Create a method to check the password to have at least one special character (!, 2, #, %, &, *, (, ), etc.)

•Create a method called isValid to check if the password is valid.

Answer 1

import java.util.Scanner;

public class PasswordValidator {

        public static void main(String[] args) {
                Scanner input = new Scanner(System.in);
                        System.out.print("Enter a password: ");
                        String s = input.nextLine();
                        if (isValid(s)) {
                                System.out.println("Valid Password");
                        } else {
                                System.out.println("Invalid Password");
                        }

        }

        public static boolean isValid(String pwd) {
                return checkCharCount(pwd) && checkForDigit(pwd) && checkForSpecial(pwd) && checkForLetter(pwd);
        }

        // checks if password has 8 characters
        public static boolean checkCharCount(String pwd) {
                return pwd.length() >= 8;
        }

        // checks if password has letter
        public static boolean checkForLetter(String pwd) {
                for (int i = 0; i < pwd.length(); i++)
                        if (Character.isLetter(pwd.charAt(i)))
                                return true;
                return false;
        }

        // checks if password contains digit
        public static boolean checkForDigit(String pwd) {
                for (int i = 0; i < pwd.length(); i++)
                        if (Character.isDigit(pwd.charAt(i)))
                                return true;
                return false;
        }

        // checks if password has special char
        public static boolean checkForSpecial(String pwd) {
                String spl = "!@#$%^&*()";
                for (int i = 0; i < pwd.length(); i++)
                        if (spl.contains(pwd.charAt(i) + ""))
                                return true;
                return false;
        }

}

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