Help please I want to add zookeeper, admin, and veterinarian to this code.

This is my assignment.

THIS IS MY CODE

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.util.Scanner;

//Define a class Authentication

public class Authentication

{

//Define main

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

{

//Call method

loginScreenpro();

}

//Define a method

public static void loginScreenpro()

{

//Define string variable

String genPass = "";

//Declare variables

int flag1 = 0,attmpts=3;

//Define reader

BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));

//Display message

System.out.println(" Login");

//Try block

try

{

//Do

do

{

//Decrement value

attmpts--;

//Display message

System.out.println("Enter Username");

//Store value

String userName = br1.readLine();

//Display message

System.out.println("Enter Password");

//Store value

String password = br1.readLine();

//Create an instance

MessageDigest MD1 = MessageDigest.getInstance("md5");

//Update

MD1.update(password.getBytes());

//Call method

byte[] bytes12 = MD1.digest();

//Create an instance

StringBuilder Sb1 = new StringBuilder();

//Loop

for (int k = 0; k

{

//Append

Sb1.append(Integer.toString((bytes12[k] & 0xff) + 0x100, 16).substring(1));

}

//Generate password

genPass = Sb1.toString();

//Declare variable

String CurrLne;

//Define an instance

BufferedReader bin1 = new BufferedReader(new FileReader("/Users/Jess/NetBeansProjects/Final_Project/src/Credentials.txt"));

//Loop until end of file

while ((CurrLne = bin1.readLine()) != null)

{

//Split each line of file

String[] strArr = CurrLne.split("\t");

// If user name matches

if (strArr[0].equals(userName))

{

//If password matches

if (strArr[1].equals(genPass))

{

//Assign value

flag1 = 1;

//Break

break;

}

}

}

//If attempt is 0

if(attmpts==0)

{

//Display message

System.out.println("login more times");

//Display message

System.out.println("Exit...");

//Exit

System.exit(1);

}

//If flag is 1

if (flag1 == 1)

{

//Call method

AdminScrn();

//Break

break;

}

//Otherwise

else

{

//Display message

System.out.println("Invalid Username or Password.");

//Display message

System.out.println(" try again.");

//Display message

System.out.println(attmpts+" more attemptes left. ");

}

}

//Loop

while(attmpts>0);

}

//Define catch

catch (NoSuchAlgorithmException e1)

{

//Trace

e1.printStackTrace();

}

//Define catch block

catch (IOException e1)

{

//Trace

e1.printStackTrace();

}

}

//Define a method

public static void AdminScrn()

{

//Declare variable

String logOut1;

//Define scanner variable

Scanner sc1= new Scanner(System.in);

//Display message

System.out.println(" Welcome Admin"); System.out.println(" Welcome Admin");

//Display message

System.out.println("user Press 99 for log out ");

//Do loop

do

{

//Store value

logOut1 = sc1.nextLine();

}

//Loop

while(!logOut1.equals("99"));

//If value is 99

if(logOut1.equals("99"))

{

//Call method

loginScreenpro();

}

}

}

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 (MDS5) hash o t is not required that you write the MDS 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 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 o .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 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 o 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