Suppose a website impose the following rules for passwords 1

Suppose a website impose the following rules for passwords.

1. A password must have at least eight characters.

2. A password consists of only letters and digits.

3. A password must contain at least two digits.

Write a program that prompts the user to enter a password. If the user enters a invalid password, the program needs to tell the user why it is invalid and ask the user to enter another password. The program should stop only when the user enters a valid password.

Make your program work for handling one password correctly. Then, add the while loop to handle potentially multiple passwords so that the program will stop only when a valid password is typed.

Output:

Ennter the password: abcd

Invaid: at least 8 characters

Ennter the new password: password

Invalid : at least 2 digits.

Ennter the new password: pass 1234

Invalid: only letter and digits

Ennter the new password: pass1234

Valid password!!

start with : [void main]

import java.util.Scanner;

public class CheckPassword1 {
public static void main(String[] args) {

PasswordChecker.java

import java.util.Scanner;

public class PasswordChecker {
public static void main(String[] args) {

       // Declaring variable
       String str = null;
       boolean digit = false;
       int count = 0, flag;

// Scanner object is used to get the inputs entered by the user
Scanner sc = new Scanner(System.in);

       while (true) {
           // Setting flag and count variables to 0
           flag = 0;
           count = 0;

// setting digit variable to false
digit = false;

           // getting the String entered by the user
           System.out.print(\"\ Enter String :\");
           str = sc.nextLine();

           // Checking if the length of the string is less than 8 or not
           if (str.length() < 8) {
               // Displaying the error message
               System.out.println(\"Invaid: at least 8 characters\");
               continue;
           } else {
               for (int i = 0; i < str.length(); i++) {
                   // Checking whether the password contains any other thing
                   // other than digit or character
                   if (!Character.isDigit(str.charAt(i))
                           && !Character.isUpperCase(str.charAt(i))
                           && !Character.isLowerCase(str.charAt(i))) {
                       // Displaying the error message
                       System.out.println(\"Invalid: only letter and digits\");
                       flag = 1;
                       continue;
                   }
                   // Checking whether the character is digit or not
                   else if (Character.isDigit(str.charAt(i))) {
                       digit = true;

                       // Counting the number of digits
                       count++;
                   }
               }

               /*
               * if the string does\'nt contain digit or if the count of digits
               * is less than 2 then if block will get executed
               */
               if (digit == false || (digit == true) && (count < 2)) {
                   // Display the error message
                   System.out.println(\"Invalid :at least 2 digits.\");

                   continue;
               }
               // If the password is valid then this block will get executed
               else if (str.length() >= 8 && digit == true && count >= 2
                       && flag == 0) {
                   // Displaying the valid message
                   System.out.println(\":: Valid Password ::\");
                   break;
               }
           }

}// End of while loop

}

_______________________________

Output:

Enter String :abcd
Invaid: at least 8 characters

Enter String :password
Invalid :at least 2 digits.

Enter String :pass 1234
Invalid: only letter and digits

Enter String :pass1234
:: Valid Password ::

________________Thank You