Main.java

import java.util.ArrayList;
import java.util.Scanner;

// Main class to run the Student Management System
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in); // Scanner for input
        StudentService service = new StudentService(); // Service for creating students
        ArrayList<Student> students = new ArrayList<>(); // List to store students

        int choice;
        do {
            // Menu options
            System.out.println("\n--- Student Management System ---");
            System.out.println("1. Add Student");
            System.out.println("2. Display Students");
            System.out.println("3. Exit");
            System.out.print("Enter choice: ");

            choice = sc.nextInt(); // Read user's choice
            sc.nextLine(); // Consume newline

            switch (choice) {
                case 1:
                    // Add a new student
                    students.add(service.createStudent());
                    break;

                case 2:
                    // Display all students
                    for (Student s : students)
                        s.display();
                    break;

                case 3:
                    // Exit program
                    System.out.println("Exiting...");
                    break;

                default:
                    System.out.println("Invalid choice"); // Handle invalid input
            }
        } while (choice != 3); // Repeat menu until user chooses Exit
    }
}