SOLID Principles in Java

🚀 A collection of examples and explanations demonstrating the SOLID Principles in Java.

SOLID is a set of five object-oriented design principles that help developers write clean, maintainable, scalable, and flexible code. These principles are widely used in enterprise applications and frameworks such as Spring Boot.

📚 What are SOLID Principles?

1️⃣ Single Responsibility Principle (SRP)

Definition: A class should have only one reason to change, meaning it should have only one responsibility.

Example: Separating user management logic from email notification logic.

2️⃣ Open/Closed Principle (OCP)

Definition: Software entities should be open for extension but closed for modification.

Example: Adding new payment methods without modifying existing payment processing code.

3️⃣ Liskov Substitution Principle (LSP)

Definition: Objects of a superclass should be replaceable with objects of its subclasses without affecting program correctness.

Example: A Dog class should be usable anywhere an Animal class is expected.

4️⃣ Interface Segregation Principle (ISP)

Definition: Clients should not be forced to depend on methods they do not use.

Example: Creating smaller, focused interfaces instead of one large interface.

5️⃣ Dependency Inversion Principle (DIP)

Definition: High-level modules should depend on abstractions rather than concrete implementations.

Example: Using interfaces and dependency injection instead of directly creating objects.

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📂 Project Structure

SOLID_Principles/
│
├── SRP/
│   └── Single Responsibility Principle Examples
│
├── OCP/
│   └── Open Closed Principle Examples
│
├── LSP/
│   └── Liskov Substitution Principle Examples
│
├── ISP/
│   └── Interface Segregation Principle Examples
│
├── DIP/
│   └── Dependency Inversion Principle Examples
│
└── README.md

🛠 Technologies Used

• Java
• Object-Oriented Programming (OOP)
• SOLID Design Principles
• IntelliJ IDEA / Eclipse

🎯 Learning Objectives

• Understand each SOLID principle.
• Learn how to write clean and maintainable code.
• Improve object-oriented design skills.
• Prepare for Java and Spring Boot interviews.
• Build scalable and flexible applications.

🚀 How to Run

1. Clone the repository:

git clone https://github.com/SagarKirtakar/Solid_Principles.git

2. Open the project in your preferred IDE.

3. Navigate to any SOLID principle example.

4. Run the Java files and observe the output.

💡 Why SOLID?

Following SOLID principles helps developers:

✅ Reduce code complexity ✅ Improve maintainability ✅ Increase code reusability ✅ Enhance scalability ✅ Write cleaner object-oriented code

🤝 Contributions

Contributions, suggestions, and improvements are welcome.

Feel free to fork the repository and submit a pull request.

👨‍💻 Author

Sagar Kirtakar

• Java Developer
• Full Stack Developer
• Spring Boot Enthusiast

⭐ Support

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Happy Coding! 🚀