Question

First, launch NetBeans and close any previous projects that may be open (at the top menu go to File ==> Close All Projects).

Then create a new Java application called "PasswordChecker" (without the quotation marks) that gets a String of a single word from the user at the command line and checks whether the String, called inputPassword, conforms to the following password policy.

The password must:

Be 3 characters in length

Include at least one uppercase character

Include at least one digit

If the password conforms to the policy, output "The provided password is valid." Otherwise, output "The provided password is invalid because it must be three characters in length and include at least one digit and at least one uppercase character. Please try again." A loop is not needed for this program.

Answer 1

import java.util.*;

public class PasswordChecker

{

    public static boolean ifValid(String pwd)

    {

        // If it is not 3 characters in length

        if(pwd.length() != 3)

            return false;

       

        int i, digit = 0, upper_case = 0;

       

        for( i = 0 ; i < pwd.length() ; i++ )

        {

            // get the ascii code of the current character

            int ascii = (int)pwd.charAt(i);

           

            // if the current character is a digit

            if( ascii >= 48 && ascii <= 57 )

                digit++;

            // if the current character is upper case

            else if( ascii >= 65 && ascii <= 90 )

                upper_case++;

        }

       

        // Include at least one uppercase character

        // Include at least one digit

        if( digit > 0 && upper_case > 0 )

            return true;

        else

            return false;

    }

   

    public static void main(String[] args)

    {

        // store the password from the command line argument

        String pwd = args[0];

       

        // create a Scanner object

        Scanner sc = new Scanner(System.in);

       

        if(ifValid(pwd))

            System.out.println("The provided password is valid.");

        else

            System.out.println("The provided password is invalid because it must be three characters in length and include at least one digit and at least one uppercase character. Please try again.");

    }

}

Sample Output

Users userDesktop>javac PasswordChecker.java Users\user Desktop>java PasswordChecker Ab9 The provided password is valid Users Nuser Desktop>java PassuordChecker AbD The provided password is invalid because it must be three characters in length a d include at least one digit and at least one uppercase character. Please try a gain AUsers user\Desktop>java PasswordChecker 123 The provided password is invalid because it must be three characters in length a nd include at least one digit and at least one uppercase character. Please try a gain Users\user Desktop>java PasswordChecker 123A The provided password is invalid because it must be three characters in length a nd include at least one digit and at least one uppercase character. Please try a gain-