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SOLID Principles in Java

This project demonstrates the 5 SOLID principles of Object-Oriented Programming using Java.
Each principle is implemented in its own package with simple, real-world inspired examples.

📌 SOLID Principles Covered

1. Single Responsibility Principle (SRP)

A class should have only one reason to change.
Example: Separation of InvoicePrinter and InvoiceSaver from Invoice.

2. Open/Closed Principle (OCP)

Classes should be open for extension but closed for modification.
Example: Adding new Shape types without modifying existing code.

3. Liskov Substitution Principle (LSP)

Subtypes must be substitutable for their base types.
Example: Dog and Cat can be used wherever Animal is expected.

4. Interface Segregation Principle (ISP)

Clients should not be forced to depend on methods they do not use.
Example: Separate interfaces for Printer, Scanner, Fax.

5. Dependency Inversion Principle (DIP)

High-level modules should not depend on low-level modules, but on abstractions.
Example: NotificationService depends on MessageSender interface, not directly on EmailSender.