🎓 Student Record Management System

Java Programming Lab | Semester 3 | KRMU Student Records Management Project

A comprehensive, persistent, and multithreaded command-line application designed to manage student records. This project serves as a consolidation of Lab Assignments 1 - 5, demonstrating mastery of Object-Oriented Programming, Java Collections, and File I/O.

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🚀 Key Features

• PERSISTENT STORAGE: Automatically saves and loads student records to a local file (students.txt) so data is never lost.
• MULTITHREADING: Features a simulated "Loading..." animation using background threads to mimic real-world data processing delays.
• SMART SORTING: Sorts students by Marks (Descending) using custom Comparator logic.
• ROBUST VALIDATION: Prevents duplicate Roll Numbers and validates input (e.g., Marks must be 0-100).
• ERROR HANDLING: Implements custom exceptions (StudentNotFoundException) for safer execution.
• MODULAR ARCHITECTURE: Clean separation of concerns using model, service, and util packages.

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📂 Project Structure

The project follows a strict Modular Design pattern as per Lab 2 & 5 guidelines:

StudentManagementSystem/
├── src/
│   ├── main/
│   │   └── Main.java                       <- Entry point (Menu System)
│   ├── model/
│   │   ├── Person.java                     <- Abstract Base Class
│   │   └── Student.java                    <- Concrete Data Class
│   ├── service/
│   │   ├── RecordActions.java              <- Interface for CRUD Operations
│   │   └── StudentManager.java             <- Business Logic & File I/O
│   └── util/
│       ├── Loader.java                     <- Multithreading Simulation
│       └── StudentNotFoundException.java   <- Custom Exception
├── students.txt                            <- Data storage file
└── README.md                               <- This File

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🛠️ Concepts Implemented

This project successfully integrates the learning outcomes from all 5 Lab Assignments:

Concept	Implementation Details
OOP Principles	Inheritance (Student extends Person), Abstraction, and Polymorphism.
Interfaces	RecordActions interface defines the contract for system operations.
Collections	ArrayList used for memory management; Iterator used for traversal.
File Handling	BufferedReader and BufferedWriter for reading/writing CSV data.
Multithreading	Runnable interface implemented in Loader.java.
Exception Handling	try-catch blocks and custom throw logic for data integrity.

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💻 How to Run

Prerequisites

• Java Development Kit (JDK) (Version 8 or higher).
• VS Code (with Extension Pack for Java) OR Terminal.

Option 1: Using VS Code (Recommended)

1. Open the StudentManagementSystem folder in VS Code.
2. Open src/main/Main.java.
3. Click the dropdown on Run or Play button located in the top right.
4. Click on Run Java

Option 2: Using Terminal / Command Line

If you prefer running it manually, follow these exact steps to avoid package errors:

1. Navigate to the source directory:

   cd "{yourlocalpath}/StudentManagementSystem/src"

2. Compile the Main class:

   javac main/Main.java

3. Run the Application:

   java main.Main

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👤 Author

Name: Rohan Rathee
University: K.R. Mangalam University
Department: School of Engineering & Technology