Utility classes in Java

As a software engineer, I often encounter utility classes used across the codebase in my daily work. Let’s explore the purpose of this class.

You've probably encountered this scenario before: you repeatedly reuse a piece of logic, so you extract it to a function. Then, you realise you're calling this function from across many different classes. That's when you decide it’s time to create a standalone class that encapsulates this function or maybe more similar to this one.

This is all done to reduce code duplication, make our codebase maintainable, and promote reusability and modularity across our codebase.

A utility class cannot be instantiated, as it only has a private constructor. Therefore, it can only provide public static methods and public static variables that are accessible and reusable from across the application. It provides generic functions that encapsulate repetitive tasks.