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;
import java.io.IOException;
import java.util.regex.Pattern;

// Java program to validate an password in Java
class PasswordVerifier
{
  
   // minimum 6 characters password with at least one digit, at least one
   // lowercase letter at least one uppercase letter,

   private static final String PASSWORD_REGEX =
       "^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=\\S+$).{6,}$";

   private static final Pattern PASSWORD_PATTERN =
                               Pattern.compile(PASSWORD_REGEX);

   public static void main(String[] args)
   {
   Scanner myObj = new Scanner(System.in); // Create a Scanner object
System.out.println("Enter·password·to·be·verified:");
String password = myObj.nextLine(); // Read user input
PasswordVerify(password);
  
      
   }
       // Validate an password
      
   static void PasswordVerify(String password1) {
System.out.println(password1);
if (PASSWORD_PATTERN.matcher(password1).matches()) {
           System.out.print("The Password " + password1 + " is valid");
       }
       else {
           System.out.print("The Password " + password1 + " isn't valid");
       }
   }
  
}