Naming convention for utility classes in Java

java

best-practices

naming-conventions

utility-classes

byAlex Kataev·Dec 12, 2024

Turn your Java utility classes into functional superstars 🌟 by naming them with a clear suffix like Utils. Keep them humble as non-instantiable with final and a private constructor.

public final class MathUtils {
    // There's the door, don't even try to instantiate me!
    private MathUtils() { throw new UnsupportedOperationException(); }

    // Just your friendly neighborhood add operation, at your service!
    public static int add(int a, int b) {
        return a + b; 
    }
}

Your class name should speak volumes about its purpose. So, MathUtils is more like a utility-belt 🦸‍♀️ full of math-powered tools rather than a single-purpose Math entity.

Distilling the essence: Clarity and purpose in names

For your utility class, make the name a clear billboard 🪧 of its purpose. The class name should act as a telegram, delivering a concise summary of what the class offers.

The suffix that fits: Utils or Helpers

Stick with Utils or Utilities for a class packed with static methods serving a grand functionality. The term Helpers is also in the play, but mostly when you are hinting towards support functions in a specific context.

Redundancy: a game we don't play

Avoid redundant suffixes like Class, Manager, Function, etc. Just like too many stickers on a suitcase, they don't tell you more about the journey and end up cluttering the view!

Package-Community relationship

Naming package-level utility classes like com.example.json.JsonUtils is an established practice. It's making utilities available at the heart of the packages they serve!

Calculators Vs Calculations: A tale of implications

At the crossroads, Calculators nudges towards a toolbox, whereas Calculations would be a library of routines. Choose wisely based on your utility class's role!

If Java Standard Library were your mentor

Executors in Java Standard Library isn't just a class - it's a story told through a name! It's a utility class serving everything related to Executor objects. So, the name sells the context!

Documentation: The hero behind the curtain

What's a name without a background? Nothing! So, don't stop at naming, annotate your utility class with proper documentation.

Anchoring the context

What's better than providing examples in the class Javadoc? They secure the utility class in its applicable context, saving your developers from a wild-goose chase!

Professionalism in patterns

Adhere like superglue to the guidelines

Want to keep your naming consistent with the best practices? Stick to the guidelines from professional organizations like Apache and Spring.

Learn from the best: Reputed Libraries

Why re-invent the wheel when you can observe patterns in reputed libraries' naming conventions? Check out Files, Paths from the java.nio.file package!

explain-codes / Java / Naming convention for utility classes in Java

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