🛡️ Defence System

A Java Swing simulation of a multi-vehicle defence control system
(🚁 Helicopter, 🚜 Tank, 🚢 Submarine) with a central Main Controller.

Built with Object-Oriented Programming (OOP) principles:
➡️ Inheritance | ➡️ Polymorphism | ➡️ Encapsulation | ➡️ Interfaces | ➡️ Composition

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✨ Features

• 🎨 User Interface (UI) built with Java Swing
• 🚁🚜🚢 Vehicles: Helicopter, Tank, Submarine
• 💬 Messaging System
  • 📢 Public (broadcast) messages
  • 🔒 Private/direct messages
  • 🖼️ GIF attachments
  • 🎵 Sound file attachments
• ⚡ Energy Monitoring System
• 🌊 Oxygen Monitoring System (Submarine only)
• 🔔 Alerts & Safe Mode for low energy/oxygen

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🏗️ Tech Stack

• Java 11+
• Java Swing (UI)
• OOP Concepts (Inheritance, Polymorphism, Encapsulation, Interfaces, Composition)

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🚀 Getting Started

📥 Clone repository

git clone https://github.com/pasindupramod755/defence-system.git
cd defence-system