StudentService.java

import java.util.Scanner;

// Service class to handle student creation and input
public class StudentService {
    Scanner sc = new Scanner(System.in); // Scanner object for user input

    // Method to create a new student (UG or PG)
    public Student createStudent() {
        System.out.print("Enter Name: ");
        String name = sc.nextLine(); // Input student name

        System.out.print("Enter Roll No: ");
        int roll = sc.nextInt(); // Input roll number

        System.out.print("Enter Marks: ");
        int marks = sc.nextInt(); // Input marks
        sc.nextLine(); // consume leftover newline

        System.out.print("1. UG Student  2. PG Student : ");
        int choice = sc.nextInt(); // Choose student type
        sc.nextLine();

        // Return UGStudent or PGStudent based on choice
        if (choice == 1)
            return new UGStudent(name, roll, marks);
        else
            return new PGStudent(name, roll, marks);
    }
}