Question

I need help ASAP on this, this is due at midnight PST. This is the current code I have. How can I allow the user to quit. My counting while loop works fine, but I would like it to not keep outputting username if a file was successfully opened.

This is what is required.

Prompt
You have assumed the role of managing the technology infrastructure at a zoo. You will develop a working program (either an authentication system or a monitoring system) for the zoo designed to follow the specifications outlined in the overview. You will also provide detailed documentation describing your development process. Select from one of the following options as the basis of your program.
Option 1: Authentication System
For security-minded professionals, it is important that only the appropriate people gain access to data in a computer system. This is called authentication. Once users gain entry, it is also important that they only see data related to their role in a computer system. This is called authorization. For the zoo, you will develop an authentication system that manages both authentication and authorization. You have been given a credentials file that contains credential information for authorized users. You have also been given three files, one for each role: zookeeper, veterinarian, and admin. Each role file describes the data the particular role should be authorized to access. Create an authentication system that does all of the following:
 Asks the user for a username
 Asks the user for a password
 Converts the password using a message digest five (MD5) hash
o It is not required that you write the MD5 from scratch. Use the code located in this document and follow the comments in it to perform this operation.
 Checks the credentials against the valid credentials provided in the credentials file
o Use the hashed passwords in the second column; the third column contains the actual passwords for testing and the fourth row contains the role of each user.
 Limits failed attempts to three before notifying the user and exiting the program
 Gives authenticated users access to the correct role file after successful authentication
o The system information stored in the role file should be displayed. For example, if a zookeeper’s credentials is successfully authenticated, then the contents from the zookeeper file will be displayed. If an admin’s credentials is successfully authenticated, then the contents from the admin file will be displayed.
 Allows a user to log out
 Stays on the credential screen until either a successful attempt has been made, three unsuccessful attempts have been made, or a user chooses to exit You are allowed to add extra roles if you would like to see another type of user added to the system, but you may not remove any of the existing roles.

This is my java code:

package finalproject;

import java.util.Scanner; //importing scanner
import java.io.BufferedReader; //importing buffered reader
import java.io.InputStreamReader; //importing input stream reader
import java.security.MessageDigest; //importing message digest
import java.io.IOException; //importing java io exception
import java.io.*;
import java.security.NoSuchAlgorithmException;

class MD5Digest { //MD5 digest class
public static void MD5Digest(String original) throws Exception {
MessageDigest md = MessageDigest.getInstance("MD5"); //get md5 digest
md.update(original.getBytes()); //updating password
byte[] digest = md.digest(); //MD5 digested password
  
StringBuffer sb = new StringBuffer(); //initializing string buffer
for (byte b: digest) {
sb.append(String.format("%02x", b & 0xff)); //appending string
}
boolean correct = true;
  
  
System.out.println("original:" + original); //original string
   System.out.println("digested:" + sb.toString()); //sb.toString() is what you'll need to compare password strings
}
}

public class FinalProject {

public static void main(String[] args) throws IOException {

  
boolean correct = false;
BufferedReader scnr = new BufferedReader(new InputStreamReader(System.in));
//new buffered reader input stream reader
String username = null;
String password = null;
  
int counter = 0;
  
while (counter < 3) { //counter for 3 attempts
counter++;


System.out.println("Enter q to quit");
System.out.println();
System.out.println("Username: "); //prompt for username
username = scnr.readLine(); //reading input
System.out.println("Password: "); //prompt for password
password = scnr.readLine(); //reading input


  
if ((username.equals("griffin.keyes")) && (password.equals("alphabet soup"))) {
//checking usename and password are correct
//output approriate file
System.out.println("Hello, Zookeeper!\n" + "\n" +
"As zookeeper, you have access to all of the animals' "
+ "information and their daily monitoring logs. "
+ "This allows you to track their feeding habits,"
+ " habitat conditions, and general welfare.");
System.out.println();
System.out.println("");
}
  
else if ((username.equals("bruce.grizzly")) && (password.equals("M0nk3y business"))){
//checking usename and password are correct   
//output approriate file
System.out.println("Hello, Zookeeper!\n" + "\n" +
"As zookeeper, you have access to all of the animals' "
+ "information and their daily monitoring logs. "
+ "This allows you to track their feeding habits,"
+ " habitat conditions, and general welfare.");
}
  
else if ((username.equals("bernie.gorilla")) && (password.equals("secret password"))) {   
//checking usename and password are correct   
//output approriate file
System.out.println("Hello, Veterinarian!\n" + "\n" +
"As veterinarian, you have access to all of the animals' health records."
+ " This allows you to view each animal's medical history"
+ " and current treatments/illnesses (if any), and to maintain a vaccination log.");
}
  
else if ((username.equals("jerome.grizzlybear")) && (password.equals("grizzly1234"))) {   
//checking usename and password are correct
//output approriate file
System.out.println("Hello, Veterinarian!\n" + "\n" +
"As veterinarian, you have access to all of the animals' health records."
+ " This allows you to view each animal's medical history"
+ " and current treatments/illnesses (if any), and to maintain a vaccination log.");
}
  
else if ((username.equals("rosario.dawson")) && (password.equals("animal doctor"))) {
//checking usename and password are correct   
//output approriate file
System.out.println("Hello, System Admin!\n" + "\n" +
"As administrator, you have access to the zoo's main computer system."
+ " This allows you to monitor users in the system and their roles.");
  
}
  
else if ((username.equals("bruce.grizzlybear")) && (password.equals("letmein"))) {
//checking usename and password are correct   
//output approriate file
System.out.println("Hello, System Admin!\n" + "\n" +
"As administrator, you have access to the zoo's main computer system."
+ " This allows you to monitor users in the system and their roles.");
  
}

}
System.out.println("You have exceeded the number of login attempts or chosen to exit");

}

}

Answer 1

/******************************FinalProject.java**************************/

import java.io.BufferedReader; //importing buffered reader
import java.io.IOException; //importing java io exception
import java.io.InputStreamReader; //importing input stream reader
import java.security.MessageDigest; //importing message digest

class MD5Digest { // MD5 digest class
   public static void MD5Digest(String original) throws Exception {
       MessageDigest md = MessageDigest.getInstance("MD5"); // get md5 digest
       md.update(original.getBytes()); // updating password
       byte[] digest = md.digest(); // MD5 digested password

       StringBuffer sb = new StringBuffer(); // initializing string buffer
       for (byte b : digest) {
           sb.append(String.format("%02x", b & 0xff)); // appending string
       }
       boolean correct = true;

       System.out.println("original:" + original); // original string
       System.out.println("digested:" + sb.toString()); // sb.toString() is what you'll need to compare password
                                                           // strings
   }
}

public class FinalProject {

   public static void main(String[] args) throws IOException {

       BufferedReader scnr = new BufferedReader(new InputStreamReader(System.in));
       // new buffered reader input stream reader
       String username = "";
       String password = "";

       int counter = 0;

       while (counter < 3) { // counter for 3 attempts
           counter++;

           System.out.println("Enter q to quit");
           System.out.println();

           System.out.println("Username: "); // prompt for username
           username = scnr.readLine(); // reading input
           if (username.equalsIgnoreCase("q")) {

               break;
           }
           System.out.println("Password: "); // prompt for password
           password = scnr.readLine(); // reading input

           if ((username.equals("griffin.keyes")) && (password.equals("alphabet soup"))) {
               // checking usename and password are correct
               // output approriate file
               System.out
                       .println("Hello, Zookeeper!\n" + "\n" + "As zookeeper, you have access to all of the animals'\n"
                               + "information and their daily monitoring logs.\n"
                               + "This allows you to track their feeding habits,\n"
                               + " habitat conditions, and general welfare.");
               System.out.println();
               System.out.println("");
           }

           else if ((username.equals("bruce.grizzly")) && (password.equals("M0nk3y business"))) {
               // checking usename and password are correct
               // output approriate file
               System.out
                       .println("Hello, Zookeeper!\n" + "\n" + "As zookeeper, you have access to all of the animals' "
                               + "information and their daily monitoring logs. "
                               + "This allows you to track their feeding habits,"
                               + " habitat conditions, and general welfare.");
           }

           else if ((username.equals("bernie.gorilla")) && (password.equals("secret password"))) {
               // checking usename and password are correct
               // output approriate file
               System.out.println("Hello, Veterinarian!\n" + "\n"
                       + "As veterinarian, you have access to all of the animals' health records."
                       + " This allows you to view each animal's medical history"
                       + " and current treatments/illnesses (if any), and to maintain a vaccination log.");
           }

           else if ((username.equals("jerome.grizzlybear")) && (password.equals("grizzly1234"))) {
               // checking usename and password are correct
               // output approriate file
               System.out.println("Hello, Veterinarian!\n" + "\n"
                       + "As veterinarian, you have access to all of the animals' health records."
                       + " This allows you to view each animal's medical history"
                       + " and current treatments/illnesses (if any), and to maintain a vaccination log.");
           }

           else if ((username.equals("rosario.dawson")) && (password.equals("animal doctor"))) {
               // checking usename and password are correct
               // output approriate file
               System.out.println("Hello, System Admin!\n" + "\n"
                       + "As administrator, you have access to the zoo's main computer system."
                       + " This allows you to monitor users in the system and their roles.");

           }

           else if ((username.equals("bruce.grizzlybear")) && (password.equals("letmein"))) {
               // checking usename and password are correct
               // output approriate file
               System.out.println("Hello, System Admin!\n" + "\n"
                       + "As administrator, you have access to the zoo's main computer system."
                       + " This allows you to monitor users in the system and their roles.");

           } else {

               System.out.println("Incorrect password! Try again....");
           }

       }
       System.out.println("You have exceeded the number of login attempts or chosen to exit");
   }
}
/**************************output***************************/

Enter q to quit

Username:
abc
Password:
abc
Incorrect password! Try again....
Enter q to quit

Username:
griffin.keyes
Password:
alphabet soup
Hello, Zookeeper!

As zookeeper, you have access to all of the animals'
information and their daily monitoring logs.
This allows you to track their feeding habits,
habitat conditions, and general welfare.

Enter q to quit

Username:
q
You have exceeded the number of login attempts or chosen to exit

Console x <terminated> FinalProject [Java Application] C:\Program Files\Java\jre1.8.0_211\bin\javaw.exe (Aug 19, 2019, 10:53:39 AM) Enter q to quit Username: abc Password: abc Incorrect password! Try again.... Enter q to quit Username: griffin.keyes Password: alphabet soup Hello, Zookeeper! As zookeeper, you have access to all of the animals information and their daily monitoring logs. This allows you to track their feeding habits, habitat conditions, and general welfare. Enter q to quit Username: You have exceeded the number of login attempts or chosen to exit

Please let me know if you have any doubt or modify the answer, Thanks :)