Understanding SOLID Principles in Java: A Comprehensive Guide with Examples

Berrachdi Mohamed
5 min readAug 27, 2023

In the world of software development, creating maintainable, flexible, and scalable code is a top priority. To achieve this, software engineers often turn to design principles that guide them in writing clean and robust code.

One such set of principles is the SOLID principles, which provide a framework for designing well-structured and maintainable object-oriented software. In this article, we’ll delve into the SOLID principles and explore how they can be applied in Java, complete with practical examples.

SOLID Principles

Introduction to SOLID Principles

SOLID is an acronym that stands for five distinct principles, each addressing a specific aspect of software design. These principles were introduced by Robert C. Martin and have become fundamental guidelines for object-oriented programming. Let’s briefly outline each principle before diving into examples:

  1. Single Responsibility Principle (SRP): This principle states that a class should have only one reason to change. In other words, a class should have a single responsibility or job.
  2. Open-Closed Principle (OCP): The Open-Closed Principle suggests that software entities (classes, modules, functions) should be open for extension but closed for modification. This…

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