WS-02-intro-to-oop/src/CourseRegistrationStarter/Main.java

package CourseRegistrationStarter;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        RegistrationSystem system = new RegistrationSystem();


        system.addCourseToSystem(new Course("Advanced Programming", "CS101", 30));
        system.addCourseToSystem(new Course("Data Structures", "CS102", 25));
        system.addCourseToSystem(new Course("Database Systems", "CS103", 20));


        System.out.print("Enter Student Name: ");
        String sName = scanner.nextLine();
        System.out.print("Enter Student ID: ");
        String sId = scanner.nextLine();
        Student student = new Student(sName, sId);

        boolean running = true;
        while (running) {
            System.out.println("\n1. View All Courses\n2. Add Course\n3. Drop Course\n4. My Courses\n5. Exit");
            System.out.print("Choice: ");
            String choice = scanner.nextLine();

            switch (choice) {
                case "1":
                    system.showAllCourses();
                    break;
                case "2":
                    System.out.print("Enter course code to add: ");
                    String addCode = scanner.nextLine();
                    Course toAdd = system.findCourseByCode(addCode);
                    if (toAdd != null) {
                        if (student.addCourse(toAdd)) System.out.println("Successfully added.");
                    } else {
                        System.out.println("Course not found!");
                    }
                    break;
                case "3":
                    System.out.print("Enter course code to drop: ");
                    String dropCode = scanner.nextLine();
                    if (student.dropCourse(dropCode)) System.out.println("Successfully dropped.");
                    else System.out.println("You are not registered in this course.");
                    break;
                case "4":
                    student.showRegisteredCourses();
                    break;
                case "5":
                    running = false;
                    System.out.println("Exiting...");
                    break;
                default:
                    System.out.println("Invalid option.");
            }
        }
        scanner.close();
    }
}