Authentication System Implmeentation

Login Functionality

The login process implements a three-attempt limit with verification code validation:

for (int attempt = 0; attempt < MAX_ATTEMPTS; attempt++) {
    String inputUsername = scanner.nextLine();
    if (!isUserRegistered(users, inputUsername)) {
        System.out.println("User not registered");
        return;
    }
    
    String verificationCode = generateVerificationCode();
    System.out.println("Verification code: " + verificationCode);
    
    String inputPassword = scanner.nextLine();
    String inputCode = scanner.nextLine();
    
    if (authenticateUser(users, inputUsername, inputPassword) 
        && inputCode.equalsIgnoreCase(verificationCode)) {
        System.out.println("Login successful");
        launchSystem();
        return;
    }
    
    System.out.println(attempt == MAX_ATTEMPTS - 1 ? 
        "Account locked" : "Remaining attempts: " + (MAX_ATTEMPTS - attempt - 1));
}

Registration Process

User registration includes comprehensive validation:

public void registerUser(ArrayList<User> userList) {
    String username = validateUsername(userList);
    String password = validatePassword();
    String idNumber = validateIdNumber();
    String phone = validatePhoneNumber();
    
    User newUser = new User(username, password, idNumber, phone);
    userList.add(newUser);
    displayUserDetails(userList);
}

private String validateUsername(ArrayList<User> userList) {
    while (true) {
        String username = scanner.nextLine();
        if (!isValidUsernameFormat(username)) {
            System.out.println("Invalid username format");
            continue;
        }
        if (isUsernameAvailable(userList, username)) {
            return username;
        }
        System.out.println("Username taken");
    }
}

Password Recovery

The password recovery system requires identity verification:

public void resetPassword(ArrayList<User> userList) {
    String username = scanner.nextLine();
    User user = findUser(userList, username);
    
    if (user == null) {
        System.out.println("User not found");
        return;
    }
    
    if (!verifyIdentity(user)) {
        System.out.println("Identity verification failed");
        return;
    }
    
    String newPassword = setNewPassword();
    user.setPassword(newPassword);
    System.out.println("Password updated successfully");
}

Core System Components

Student Class

public class Student {
    private String studentId;
    private String fullName;
    private int age;
    private String gender;
    private String residence;
    
    // Constructor, getters, and setters
}

Main System Operations

public class StudentManager {
    private ArrayList<Student> studentRecords;
    
    public void addStudent() {
        Student newStudent = new Student();
        // Collect and validate student data
        studentRecords.add(newStudent);
    }
    
    public void removeStudent(String studentId) {
        // Implementation for student removal
    }
    
    public void updateStudent(String studentId) {
        // Implementation for student data modification
    }
    
    public void displayAllStudents() {
        // Implementation for displaying student records
    }
}