🎓 Course Enrollment System

A menu-driven console-based Java application that manages students, courses, and enrollments using OOP, file handling, auto-ID generation, and exception handling.

This project simulates a basic university course registration system and is ideal for Java practice, academic submissions, and internship portfolios.

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✨ Features

👨‍🎓 Student Management

• Add new student (Auto-generated ID)
• View all students
• Search student by ID

📚 Course Management

• Add new course with capacity
• View all courses
• Course capacity limit

📝 Enrollment Management

• Enroll student in a course
• Prevent duplicate enrollment
• Drop course
• View all enrollments
• Show courses of a specific student

⚙️ System Features

• Menu-driven interface
• Exception handling for invalid input
• File handling (data saved after exit)
• Persistent auto-ID after restart

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🧠 Concepts Used

• Object-Oriented Programming (OOP)
• Encapsulation & Classes
• Custom Exception
• Java Serialization
• File Handling
• Collections (ArrayList)
• Streams API
• Input Validation

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🗂️ Project Structure

course-enrollment-system
 ├── Student.java
 ├── Course.java
 ├── Enrollment.java
 ├── FileManager.java
 ├── InvalidChoiceException.java
 └── Main.java

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▶️ How to Run

1️⃣ Compile

javac *.java

2️⃣ Run

java Main

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💾 Data Storage

The system automatically creates and uses:

• students.dat
• courses.dat
• enrollments.dat

These files store data so it is retained after restarting the application.

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🖥️ Sample Menu

===== COURSE ENROLLMENT SYSTEM =====
1. Add Student
2. Add Course
3. Enroll Student
4. View Students
5. View Courses
6. View Enrollments
7. Search Student
8. Drop Course
9. Show Student Courses
10. Exit

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🏆 Use Cases

• Java OOP practice project
• College mini project
• Internship resume project
• File handling demonstration