Question

Valid or Invalid Password Deliverables

• Complete one document that shows your planning (IPO Chart). Include in it Input, Processing, Output, Variables, Algorithm, Testing Conditions

• Complete the code for your method and test it then upload for grading

Requirements: Write a Java method to check whether a string is a valid password.

Password rules: A password must have at least ten characters.

A password consists of only letters and digits.

A password must contain at least two digits.

Expected Output:

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 Input a password (You are agreeing to the above Terms and Conditions.): abcd1234 Password is valid: abcd1234

Answer 1

Java Program:

   import java.util.Scanner;

   public class ValidatePassword
   {
       public static void main(String[] args)
       {
           //To hold the user's input
           String a, b;
          
           //A Scanner object for keyboard input.
           Scanner a1 = new Scanner(System.in);
          
           System.out.println("\n 1. A password must have at least eight characters. \n 2. A password consists of only letters and digits.");
           System.out.print(" 3. A password must contain at least two digits \n\n Input a password (You are agreeing to the above Terms and Conditions.): ");
           //Prompt the user to enter the password.
           a = a1.next();
          
           // Validating for length
           if(a.length() >= 8)
           {
               int letters = 0, digits = 0, specials = 0;
              
               // Iterating over string
               for(int i=0; i<a.length(); i++)
               {  
                   //Checking for letters
                   if( Character.isLetter(a.charAt(i)) )
                   {
                       letters += 1;
                   }
                  
                   //Checking for digits
                   else if( Character.isDigit(a.charAt(i)) )
                   {
                       digits += 1;
                   }
                  
                   //Checking for special symbols
                   else
                   {
                       specials += 1;
                   }
               }
              
               //Validating combination of characters
               if(specials > 0)
               {
                   System.out.println("\n\n Error!!! Password should be a combination of only Letters, Digits but not special symbols... \n");
               }
               //Combination error
               else if(digits < 2)
               {
                   System.out.println("\n\n Error!!! Password should contain at-least 2 digits... \n");
               }
               else
               {
                   System.out.println("\n\n Password is Valid: " + a + " \n\n");
               }
           }
           //Length error
           else
           {
               System.out.println("\n Error!!! Password length should be minimum eight characters \n");
           }
       }
   }

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