Invoice Management System

👤 Student Information

Name: Defi Maleji

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📌 Project Description

This is a multi-phase, database-backed invoicing system developed in Java for the Very Good Building & Development Company (VGB).
The system manages customer invoices, billing, item tracking, and report generation. It supports multiple item types:

• Equipment
• Lease
• Rental
• Material
• Contract

Key features:

• ✅ Tax logic for accurate billing
• ✅ UUID-based identifiers for customers & items
• ✅ Object-oriented design for scalability

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📂 Project Structure

invoice-management-system/
│── src/                # Java source code
│   ├── models/         # Item, Customer, Invoice classes
│   ├── database/       # Database connection + queries
│   ├── services/       # Business logic (tax, billing, reports)
│   └── Main.java       # Entry point
│
├── resources/          # Config files, SQL scripts
├── tests/              # Unit tests
├── README.md           # Documentation
└── LICENSE             # Open-source license

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⚙️ Tech Stack

• Language: Java
• Database: MySQL (or SQLite for lightweight setups)
• Build Tool: Maven / Gradle
• Testing: JUnit

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🚀 How to Run

1. Clone the repository:

   git clone https://github.com/defimaleji/invoice-management-system.git
   cd invoice-management-system

2. Set up the database (see resources/schema.sql).
3. Build and run:

   mvn clean install
   java -jar target/invoice-system.jar

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✅ Current Phase

• Database schema
• Customer & item models
• Invoice generation
• Report generation (in progress)
• UI layer (planned)

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📄 License

This project is licensed under the MIT License – see the LICENSE file for details.