Question

[JAVA]

You will write a program to validate passwords for users, making sure they meet the following criteria:
Rules:
Passwords must be at least 8 characters long
Passwords can only contain alpha numeric characters (no spaces or special characters)
Passwords must contain at least 1 uppercase character
Passwords must contain at least 1 lowercase character
Passwords must contain at least 1 numeric character (0-9)
Passwords cannot contain the word “password”

A password that does not meet all of these rules must list each rule that it breaks.
You must repeatedly ask the user for a password until the user enters “endofinput”

This question was posted before however it used methods and I am not able to use methods for this assignment

Answer 1

Given below is the code for the question. Please do rate the answer if it helped. Thank you.

import java.util.Scanner;

public class PasswordValidator {
   public static void main(String[] args) {
       Scanner input = new Scanner(System.in);
       String password;
       System.out.print("Enter password: ");
       password = input.nextLine();

       boolean alphanumOk, ucaseOk, lcaseOk, digitOk;
       while(!password.equals("endofinput")) {
           if(password.contains("password"))
               System.out.println("Password should not contain the word 'password'");
           if(password.length() < 8)
               System.out.println("Password should be atleast 8 characters long");

           alphanumOk = true;
           ucaseOk = false;
           lcaseOk = false;
           digitOk = false;

           for(int i = 0; i < password.length(); i++) {
               char c = password.charAt(i);
               if(Character.isUpperCase(c))
                   ucaseOk = true;
               else if(Character.isLowerCase(c))
                   lcaseOk = true;
               else if(Character.isDigit(c))
                   digitOk = true;
               else
                   alphanumOk = false;
           }

           if(!alphanumOk)
               System.out.println("Passoword can not contain special characters. Only alphanumeric characters allowed");
           if(!lcaseOk)
               System.out.println("Password should contain atleast one lower case letter");
           if(!ucaseOk)
               System.out.println("Password should contain atleast one upper case letter");
           if(!digitOk)
               System.out.println("Password should contain atleast one digit");
           if(alphanumOk && lcaseOk && ucaseOk && digitOk)
               System.out.println("Password is good");

           System.out.print("Enter password: ");
           password = input.nextLine();

       }      
   }
}