Java Naming Standards

Introduction

I guess I run with whatever the linter tells me but wanted to capture a way here

Naming Standards

Here we go.

Type	Convention	Example
Variables	camelCase	String userName = "John";
Methods	camelCase	public void calculateTotal() { ... }
Parameters	camelCase	public User getUser(String userId) { ... }
Classes	PascalCase	public class UserAccount { ... }
Interfaces	PascalCase	public interface UserProfile { ... }
Enums	PascalCase	public enum UserRole { ADMIN, EDITOR, VIEWER }
Enum constants	UPPER_SNAKE_CASE	public enum UserRole { ADMIN, EDITOR, VIEWER }
Constants	UPPER_SNAKE_CASE	public static final int MAX_RETRY_ATTEMPTS = 3;
Package names	lowercase	package com.example.project;
Instance fields	camelCase	private int accountBalance;
Static fields	camelCase (non-final)	private static int userCount;
Generic type parameters	Single uppercase letter	public <T> void process(T item) { ... }
File names	PascalCase.java (match class name)	UserAccount.java
Test class names	PascalCase with Test suffix	UserAccountTest.java
JUnit test methods	camelCase with descriptive names	void shouldThrowExceptionWhenInvalidInput() { ... }

And...

Convention	Description	Example
Acronyms in Names	Two-letter acronyms are uppercase; longer acronyms capitalize only the first letter.	IOStream, HttpRequest
Bean Properties	Use getPropertyName() or isPropertyName() for getters, and setPropertyName() for setters.	public String getUserName(), public void setUserName(String userName)
Abstract Classes	Prefix abstract classes with "Abstract".	public abstract class AbstractRepository
Implementation Classes	Suffix implementation classes with "Impl".	public class UserServiceImpl
Inner Classes	Use PascalCase like regular classes.	public class UserAccountHelper
Annotations	Use PascalCase for custom annotation types.	public @interface CustomAnnotation
Lambda Parameters	Use single-letter names for simple lambdas; use descriptive names for complex lambdas.	x -> x * 2, (user, role) -> user.hasRole(role)
Maven/Gradle Identifiers	Use lowercase for group IDs and hyphenated lowercase for artifact IDs.	com.example, user-service