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Naming conventions 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 mix words such that each word or abbreviation begins with a capital letter or first word with a lowercase letter, rest all with capital.

Classes and Interfaces :

Class names and Interface names should be noun in mixed case with the first letter of each internal word capitalized. Use whole words and must avoid acronyms and abbreviations.

Examples:

interface  Area
interface  FindArea
class Area
class FindArea

Methods :

Methods should be verbs, in mixed case with the first letter lowercase and with the first letter of each internal word capitalized.

Examples:

void changeGear(int newValue);
void change();
void speedUp(int increment);
void applyOnBrakes(int decrement);

Variables :

One-character variable names should be avoided except for temporary variables. Variable names should be short yet meaningful and in small letters.

Examples:

    int speed = 0;
    double areaOfCircle=55.3;
    int gear = 1;

Constant variables:

Should be all uppercase with words separated by underscores (“_”). There are various constants used in predefined classes like Character, Float, Long, String etc.

Examples:

static final int WIDTH = 4;

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 organization’s own internal naming conventions.

Examples:

com.sun.eng
com.help4code.project
java.lang
java.util