Question

You are developing a software package for an online shopping site that requires users to enter their own passwords. Your software requires that users' passwords meet the following criteria:

● The password should be at least six characters long.
● The password should contain at least one uppercase and at least one
lowercase letter.
● The password should have at least one digit.

Write a method that verifies that a password meets the stated criteria. Use this method in a program that allows the user to enter a password and then determines whether or not it is a valid password. If it is valid, have the program print "Valid Password". Otherwise, it should print "Invalid Password".

Sample Run
java PasswordVerifier

Enter·password·to·be·verified:ComputerScience4Life↵
Valid·password

Answer 1

import java.util.Scanner;

public class PasswordVerifier {
        public static void main(String[] args) {
                Scanner sc = new Scanner(System.in);
                System.out.print("Enter password to be verified: ");
                String password = sc.nextLine();
                if (validPassword(password))
                        System.out.println("Valid password");
                else
                        System.out.println("Invalid password");
        }

        public static boolean validPassword(String pwd) {
                return checkLength(pwd) && hasUppercase(pwd) && hasLowerCase(pwd) && hasDigits(pwd);

        }

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

        public static boolean hasLowerCase(String pwd) {
                for (int i = 0; i < pwd.length(); i++)
                        if (Character.isLetter(pwd.charAt(i)) && Character.isLowerCase(pwd.charAt(i)))
                                return true;
                return false;
        }

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

        public static boolean checkLength(String s) {
                return s.length() >= 6;
        }
}

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