☕ Java Design Patterns

🚀 Explore the power of Object-Oriented Design with 20+ hands-on Java implementations of the most essential Design Patterns.
Sharpen your system design skills, prepare for LLD interviews, and become a better architect.

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🔥 What's Inside?

A curated collection of Java implementations of GOF (Gang of Four) design patterns, each with:

• 🔹 Simple and modular code
• 🔹 Real-world use-case analogy
• 🔹 Clean architecture separation

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🧠 Patterns Included

🏗️ Creational

• ✅ Abstract Factory
• ✅ Factory Method
• ✅ Builder
• ✅ Singleton
• ✅ Prototype

🧱 Structural

• ✅ Adapter
• ✅ Decorator
• ✅ Proxy
• ✅ Composite
• ✅ Bridge

🔄 Behavioral

• ✅ Observer
• ✅ Strategy
• ✅ Command
• ✅ Iterator
• ✅ Chain of Responsibility
• ✅ Template Method

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📂 Folder Structure

Design-Patterns-main/
└── src/
    ├── AbstractFactory/
    ├── Adapter/
    ├── Builder/
    ├── Decorator/
    └── ...

Each folder contains:

• 🧪 Pattern Classes
• 🧑‍💻 Client.java with a demo scenario

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💡 Visual Learning

Visual source: Refactoring.Guru

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⚙️ Getting Started

Prerequisites

• Java JDK 8 or higher
• Any Java IDE (Eclipse, IntelliJ, VS Code)

Run Example

cd src/Builder
javac *.java
java Client

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📈 Use Cases

✅ LLD Interviews
✅ System Design Practice
✅ Java Architecture Skills
✅ Portfolio Enhancement

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🙋‍♂️ Author

Aman Singh
🔗 LinkedIn
📫 [email protected]

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⭐ Show Some Love

If you like this project, consider giving it a ⭐ star on GitHub and share it with your peers!