What is the Interface Segregation Principle?

What is the Interface Segregation Principle?

The Interface Segregation Principle (ISP) states that no client should be forced to depend on methods it does not use. It encourages creating smaller, more specific interfaces.

Can you give me an example of this principle in action?

Sure! Imagine a printer interface that has methods for scanning, printing, and faxing. If a simple printer only needs to print, it shouldn't be forced to implement scanning and faxing methods. Instead, you could create separate interfaces for each function.

Why is this principle important in software design?

It's important because it promotes a more modular design, making code easier to understand, maintain, and test. It also reduces the impact of changes in one part of the system on others.

How does it relate to other SOLID principles?

ISP is one of the five SOLID principles of object-oriented design. It complements the Single Responsibility Principle by ensuring that interfaces are focused and not overloaded with unnecessary methods.