Student Management System

A console-based College Student Management System built in Java demonstrating core Object-Oriented Programming concepts: Abstraction, Encapsulation, Inheritance, and Polymorphism.

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OOP Concepts Used

Concept	Where
Abstraction	Person abstract class + Repository<T,ID> interface
Encapsulation	Private fields with getters/setters across all model classes
Inheritance	Student and Faculty extend Person
Polymorphism	getRole() overridden in Student and Faculty; Grade.fromScore() logic
Generics	Repository<T, ID> — one interface, three implementations
Custom Exceptions	StudentNotFoundException, DuplicateEntryException, InvalidDataException
Enums	Grade with associated grade points

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Project Structure

src/
├── main/java/sms/
│   ├── Main.java                  ← entry point
│   ├── model/
│   │   ├── Person.java            ← abstract base class
│   │   ├── Student.java           ← extends Person
│   │   ├── Faculty.java           ← extends Person
│   │   ├── Subject.java
│   │   ├── Result.java
│   │   └── Grade.java             ← enum with grade points
│   ├── repository/
│   │   ├── Repository.java        ← generic CRUD interface
│   │   ├── StudentRepository.java
│   │   ├── FacultyRepository.java
│   │   └── SubjectRepository.java
│   ├── service/
│   │   ├── StudentService.java
│   │   ├── FacultyService.java
│   │   ├── SubjectService.java
│   │   └── ReportService.java
│   ├── exception/
│   │   ├── StudentNotFoundException.java
│   │   ├── FacultyNotFoundException.java
│   │   ├── DuplicateEntryException.java
│   │   └── InvalidDataException.java
│   ├── util/
│   │   ├── Validator.java
│   │   ├── IDGenerator.java
│   │   └── TablePrinter.java
│   └── ui/
│       └── ConsoleMenu.java
└── test/java/sms/
    ├── StudentServiceTest.java
    └── GradeTest.java

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Features

• Enroll, update, and delete students
• Add faculty and assign subjects to them
• Record marks and auto-compute grades + CGPA (credit-weighted)
• Track attendance percentage
• Generate academic reports, merit lists, and attendance defaulter lists
• Input validation with descriptive error messages

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How to Run

Prerequisites

• Java 17+
• Maven 3.8+

Build & Run

# Compile and run tests
mvn clean test

# Package
mvn clean package

# Run the application
java -jar target/sms.jar

Without Maven (compile manually)

find src/main/java -name "*.java" > sources.txt
javac -d out @sources.txt
java -cp out sms.Main

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Sample Workflow

1. Add subjects (Subject Management → Add Subject)
2. Enroll students (Student Management → Enroll)
3. Add marks for enrolled students using subject codes
4. Generate reports (Reports → Student academic report / Merit list)

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Tech Stack

• Java 17
• Maven (build + dependency management)
• JUnit 5 (unit tests)
• No external frameworks — pure Java OOP