Naming Convention rules for Java Identifiers

To develop a product using java, developers should have to be follow java coding standards. In this the basic and main naming conventions will take major role to develop good quality software.Here i am going tell you on naming convention rules to use Java Identifiers like: Packages,Classes,Interfaces,Methods,Variables and Constants.

Naming Conventions

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, currently com, edu, gov, mil, net, org, or one of the English two-letter codes identifying countries as specified in ISO Standards.

Subsequent components of the package name vary according to an organization’s own internal naming conventions. Such conventions might specify that certain directory name components be division, department, project, machine, or login names.

Example:

com.sun.eng
com.apple.quicktime.v2
edu.cmu.cs.bovik.cheese

Classes: Class names should be nouns, in mixed case with the first letter of each internal word capitalized. Try to keep your class names simple and descriptive. Use whole words-avoid acronyms and abbreviations (unless the abbreviation is much more widely used than the long form, such as URL or HTML).

Example:

class Raster;
class ImageSprite;

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

Example:

run();
runFast();
getBackground();

Variables: Except for variables, all instance, class, and class constants are in mixed case with a lowercase first letter. Internal words start with capital letters. Variable names should not start with underscore _ or dollar sign $ characters, even though both are allowed.

Variable names should be short yet meaningful. The choice of a variable name should be mnemonic- that is, designed to indicate to the casual observer the intent of its use. One-character variable names should be avoided except for temporary “throwaway” variables. Common names for temporary variables are i, j, k, m, and n for integers; c, d, and e for characters.

Example:

int i;
char c;
float myWidth;

Constants: The names of variables declared class constants and of ANSI constants should be all uppercase with words separated by underscores (“_”). (ANSI constants should be avoided, for ease of debugging.)

Example:

static final int MIN_WIDTH = 4;
static final int MAX_WIDTH = 999;
static final int GET_THE_CPU = 1;

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