Main.java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        StudentService service = new StudentService();

        int choice;
        do {
            System.out.println("\n===== Student Record Management System =====");
            System.out.println("1. Add Student");
            System.out.println("2. View All Students");
            System.out.println("3. Search Student by ID");
            System.out.println("4. Update Student by ID");
            System.out.println("5. Delete Student by ID");
            System.out.println("6. Exit");
            System.out.print("Enter your choice: ");
            choice = sc.nextInt();
            sc.nextLine(); // consume newline

            switch (choice) {
                case 1 -> {
                    System.out.print("Enter ID: ");
                    int id = sc.nextInt();
                    sc.nextLine();
                    System.out.print("Enter Name: ");
                    String name = sc.nextLine();
                    System.out.print("Enter Age: ");
                    int age = sc.nextInt();
                    sc.nextLine();
                    System.out.print("Enter Course: ");
                    String course = sc.nextLine();

                    Student student = new Student(id, name, age, course);
                    service.addStudent(student);
                }

                case 2 -> service.viewAllStudents();

                case 3 -> {
                    System.out.print("Enter ID to search: ");
                    int id = sc.nextInt();
                    Student s = service.searchStudentById(id);
                    if (s != null) System.out.println(s);
                    else System.out.println("⚠ Student not found.");
                }

                case 4 -> {
                    System.out.print("Enter ID to update: ");
                    int id = sc.nextInt();
                    sc.nextLine();
                    System.out.print("Enter new Name: ");
                    String name = sc.nextLine();
                    System.out.print("Enter new Age: ");
                    int age = sc.nextInt();
                    sc.nextLine();
                    System.out.print("Enter new Course: ");
                    String course = sc.nextLine();

                    boolean updated = service.updateStudentById(id, name, age, course);
                    System.out.println(updated ? "✔ Student updated successfully." : "⚠ Student not found.");
                }

                case 5 -> {
                    System.out.print("Enter ID to delete: ");
                    int id = sc.nextInt();
                    boolean deleted = service.deleteStudentById(id);
                    System.out.println(deleted ? "✔ Student deleted successfully." : "⚠ Student not found.");
                }

                case 6 -> System.out.println("Exiting program. Goodbye!");
                default -> System.out.println("Invalid choice! Try again.");
            }

        } while (choice != 6);

        sc.close();
    }
}