Java Naming Conventions - Classes, Methods, Variables and Constants

⏱️ 6 min read • Beginner Level • Lesson 13

Java naming conventions are recommended rules for naming identifiers such as packages, classes, interfaces, methods, variables, and constants. They make code easier to read, understand, and maintain.

Before learning naming conventions, you should understand Java identifiers and Java variables. After this lesson, continue with Java literals.

What are Naming Conventions in Java?

Naming conventions are style guidelines that developers follow while naming program elements. They are not compulsory rules like Java syntax, but they are considered good programming practice.

Why are Naming Conventions Important?

Java Naming Convention Rules

Camel Case and Pascal Case in Java

Java commonly uses camelCase and PascalCase naming styles.

Package Naming Convention

Package names should be written in lowercase letters. In real projects, package names often use a reversed domain name style.

package com.prowessapps.java;

class Student {
    // class body
}

Class and Interface Naming Convention

Class and interface names should use PascalCase. Class names are usually nouns, while interface names can be nouns or adjectives depending on their purpose.

class StudentDetails {
    // class name uses PascalCase
}

interface Printable {
    // interface name also uses PascalCase
}

Method and Variable Naming Convention

Method and variable names should use camelCase. Method names usually represent actions, so they often start with verbs.

class Employee {
    String firstName;
    int totalMarks;

    void calculateSalary() {
        System.out.println("Salary calculated");
    }
}

Constant and Enum Naming Convention

Constants are usually declared using static final and written in uppercase letters. Enum constants are also written in uppercase letters.

class AppConfig {
    static final int MAX_USERS = 100;
    static final double PI = 3.14159;
}

enum Status {
    ACTIVE,
    INACTIVE,
    PENDING
}

Complete Example of Java Naming Conventions

The following example shows package, class, variable, method, constant, and enum naming styles together.

class NamingConventionExample {
    static final int MAX_MARKS = 100;

    String studentName;
    int obtainedMarks;

    void displayResult() {
        System.out.println("Student Name: " + studentName);
        System.out.println("Marks: " + obtainedMarks + "/" + MAX_MARKS);
    }

    public static void main(String[] args) {
        NamingConventionExample student = new NamingConventionExample();
        student.studentName = "Ayan";
        student.obtainedMarks = 85;
        student.displayResult();
    }
}

Output:

Student Name: Ayan
Marks: 85/100

Common Mistakes in Java Naming

Interview Questions ⭐

🧠 Test your understanding with a quick quiz

🎉 Great job! Continue learning Java step by step.