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Java Naming Conventions

  • Difficulty Level : Basic
  • Last Updated : 22 Jul, 2021

Below are some naming conventions of java programming language. They must be followed while developing software in java for good maintenance and readability of code. Java uses CamelCase as a practice for writing names of methods, variables, classes, packages and constants.

Camel case in Java Programming : It consists of compound words or phrases such that each word or abbreviation begins with a capital letter or first word with a lowercase letter, rest all with capital.

  1. Classes and Interfaces :
    • Class names should be nouns, in mixed case with the first letter of each internal word capitalised. Interfaces name should also be capitalised just like class names.
    • Use whole words and must avoid acronyms and abbreviations.


    interface  Bicycle
    class MountainBike implements Bicyle
    interface Sport
    class Football implements Sport
  2. Methods :
    • Methods should be verbs, in mixed case with the first letter lowercase and with the first letter of each internal word capitalised.


    void changeGear(int newValue);
    void speedUp(int increment);
    void applyBrakes(int decrement);
  3. Variables : Variable names should be short yet meaningful.
    • Variables can also start with either underscore(‘_’) or dollar sign ‘$’ characters.
    • Should be mnemonic i.e, designed to indicate to the casual observer the intent of its use.
    • One-character variable names should be avoided except for temporary variables.
    • Common names for temporary variables are i, j, k, m, and n for integers; c, d, and e for characters.


        // variables for MountainBike class
        int speed = 0;
        int gear = 1;
  4. Constant variables:
    • Should be all uppercase with words separated by underscores (“_”).
    • There are various constants used in predefined classes like Float, Long, String etc.


    static final int MIN_WIDTH = 4;
    // Some  Constant variables used in predefined Float class
    public static final float POSITIVE_INFINITY = 1.0f / 0.0f;
    public static final float NEGATIVE_INFINITY = -1.0f / 0.0f;
    public static final float NaN = 0.0f / 0.0f;
  5. Packages:
    • The prefix of a unique package name is always written in all-lowercase ASCII letters and should be one of the top-level domain names, like com, edu, gov, mil, net, org.
    • Subsequent components of the package name vary according to an organisation’s own internal naming conventions.


    // java.lang packet in JDK

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