Design principles

This chapter and the following sections cover object-oriented design principles, its characteristics, and the design patterns in detail. Each pattern section covers its need, design considerations, and best practices so that readers get the idea of patterns and its applications.

Let's start with a core principle usually referred to as an acronym "SOLID," in detail.

Single responsibility principle (SRP) – SOLID

In object-oriented programming style, the single responsibility enforces that each class should represent one and only one responsibility and so if it needs to undergo changes, that should be for only one reason, that is, a class should have one and only one reason to change.

When...