🧠 Low Level Design (LLD) - Design Patterns Repository

Welcome to the Low-Level Design (LLD) repository!
This repo is focused on mastering Object-Oriented Design Principles through Design Patterns, complete with:

• ✅ Real-world examples
• ✅ Java code implementation
• ✅ UML Diagrams

---

📂 Folder Structure

Each folder contains:

• UML.png – Class diagram for understanding architecture
• COR.java – Java implementation with real-life scenario

---

📌 Covered Patterns

✅ Creational Patterns

Pattern	Description
Singleton	One and only one instance
Factory	Object creation logic abstracted
Abstract Factory	Factory of factories
Builder	Step-by-step object construction
Prototype	Cloning objects

✅ Structural Patterns

Pattern	Description
Facade	Simplify complex systems via one interface
Adapter	Bridge two incompatible interfaces
Decorator	Add functionality at runtime
Composite	Treat group of objects as one
Proxy	Represent another object

✅ Behavioral Patterns

Pattern	Description
Observer	Event-based trigger/notification
Strategy	Switch algorithms at runtime
Command	Encapsulate request as object
State	Change behavior based on internal state
Mediator	Reduce communication complexity

---

🎯 How to Use

Each pattern folder contains:

• 🖼️ A UML Diagram to visualize the structure
• 🧑‍💻 Java code example demonstrating real-life use-case