CourseManagement.java

import java.util.ArrayList;
import java.util.HashMap;

/**
 * CourseManagement handles all system operations using static methods.
 */
public class CourseManagement {
    private static ArrayList<Course> courses = new ArrayList<>();
    private static HashMap<Student, HashMap<Course, Double>> overallGrades = new HashMap<>();

    /**
     * Adds a new course to the system.
     */
    public static void addCourse(String courseCode, String name, int maxCapacity) {
        Course newCourse = new Course(courseCode, name, maxCapacity);
        courses.add(newCourse);
    }

    /**
     * Gets all courses in the system.
     */
    public static ArrayList<Course> getCourses() {
        return courses;
    }

    /**
     * Enrolls a student in a course.
     */
    public static void enrollStudent(Student student, Course course) {
        if (course.hasSpace()) {
            student.enrollInCourse(course);
            System.out.println(student.getName() + " enrolled in " + course.getName());
        } else {
            System.out.println("Error: " + course.getName() + " is full!");
        }
    }

    /**
     * Assigns a grade to a student for a course.
     */
    public static void assignGrade(Student student, Course course, double grade) {
        student.assignGrade(course, grade);
        System.out.println("Grade assigned to " + student.getName() + " for " + course.getName());
    }

    /**
     * Calculates overall grade for a student.
     */
    public static double calculateOverallGrade(Student student) {
        HashMap<Course, Double> grades = student.getAllGrades();
        if (grades.isEmpty()) {
            return 0.0;
        }
        double sum = 0.0;
        for (double grade : grades.values()) {
            sum += grade;
        }
        double average = sum / grades.size();
        overallGrades.put(student, grades);
        return average;
    }
}