STUDENT COURSE REGISTRATION SYSTEM.java

import java.util.*;

class Course {
    private String courseCode;
    private String title;
    private String description;
    private int capacity;
    private int enrolled;
    private String schedule;

    public Course(String courseCode, String title, String description, int capacity, String schedule) {
        this.courseCode = courseCode;
        this.title = title;
        this.description = description;
        this.capacity = capacity;
        this.enrolled = 0;
        this.schedule = schedule;
    }

    public String getCourseCode() {
        return courseCode;
    }

    public String getTitle() {
        return title;
    }

    public String getDescription() {
        return description;
    }

    public int getCapacity() {
        return capacity;
    }

    public int getEnrolled() {
        return enrolled;
    }

    public String getSchedule() {
        return schedule;
    }

    public boolean registerStudent() {
        if (enrolled < capacity) {
            enrolled++;
            return true;
        }
        return false;
    }

    public boolean dropStudent() {
        if (enrolled > 0) {
            enrolled--;
            return true;
        }
        return false;
    }

    public boolean hasAvailableSlots() {
        return enrolled < capacity;
    }
}

class Student {
    private String studentID;
    private String name;
    private List<Course> registeredCourses;

    public Student(String studentID, String name) {
        this.studentID = studentID;
        this.name = name;
        this.registeredCourses = new ArrayList<>();
    }

    public String getStudentID() {
        return studentID;
    }

    public List<Course> getRegisteredCourses() {
        return registeredCourses;
    }

    public boolean registerForCourse(Course course) {
        if (!registeredCourses.contains(course) && course.registerStudent()) {
            registeredCourses.add(course);
            return true;
        }
        return false;
    }

    public boolean dropCourse(Course course) {
        if (registeredCourses.contains(course) && course.dropStudent()) {
            registeredCourses.remove(course);
            return true;
        }
        return false;
    }
}

class CourseManagementSystem {
    private List<Course> courseDatabase;
    private List<Student> studentDatabase;

    public CourseManagementSystem() {
        this.courseDatabase = new ArrayList<>();
        this.studentDatabase = new ArrayList<>();
    }

    public void addCourse(Course course) {
        courseDatabase.add(course);
    }

    public void addStudent(Student student) {
        studentDatabase.add(student);
    }

    public void displayCourses() {
        System.out.println("\n--- Available Courses ---");
        for (Course course : courseDatabase) {
            System.out.println("Course Code: " + course.getCourseCode());
            System.out.println("Title: " + course.getTitle());
            System.out.println("Description: " + course.getDescription());
            System.out.println("Capacity: " + course.getCapacity());
            System.out.println("Enrolled: " + course.getEnrolled());
            System.out.println("Schedule: " + course.getSchedule());
            System.out.println("Available Slots: " + (course.getCapacity() - course.getEnrolled()));
            System.out.println("-------------------------");
        }
    }

    public Student findStudent(String studentID) {
        for (Student student : studentDatabase) {
            if (student.getStudentID().equals(studentID)) return student;
        }
        return null;
    }

    public Course findCourse(String courseCode) {
        for (Course course : courseDatabase) {
            if (course.getCourseCode().equals(courseCode)) return course;
        }
        return null;
    }

    public void registerStudentForCourse(String studentID, String courseCode) {
        Student student = findStudent(studentID);
        Course course = findCourse(courseCode);
        if (student != null && course != null && student.registerForCourse(course)) {
            System.out.println("Registration successful.");
        } else {
            System.out.println("Registration failed. Course may be full or already registered.");
        }
    }

    public void dropStudentFromCourse(String studentID, String courseCode) {
        Student student = findStudent(studentID);
        Course course = findCourse(courseCode);
        if (student != null && course != null && student.dropCourse(course)) {
            System.out.println("Course dropped successfully.");
        } else {
            System.out.println("Drop failed. Course may not be registered.");
        }
    }
}

public class Main {
    public static void main(String[] args) {
        CourseManagementSystem cms = new CourseManagementSystem();
        
        Course course1 = new Course("CS101", "Intro to Programming", "Learn programming basics", 30, "MWF 9-10AM");
        Course course2 = new Course("CS102", "Data Structures", "Learn about data structures", 25, "TTh 11-12AM");

        cms.addCourse(course1);
        cms.addCourse(course2);

        Student student1 = new Student("S1001", "Alice");
        cms.addStudent(student1);

        cms.displayCourses();
        cms.registerStudentForCourse("S1001", "CS101");
        cms.registerStudentForCourse("S1001", "CS102");
        cms.dropStudentFromCourse("S1001", "CS101");

        System.out.println("\n--- " + student1.getStudentID() + " Registered Courses ---");
        for (Course course : student1.getRegisteredCourses()) {
            System.out.println("Course Code: " + course.getCourseCode() + " | Title: " + course.getTitle());
        }
    }
}