Java Naming Conventions

Java Naming conventions

A naming convention is a rule to follow as you decide what to name your identifiers e.g. class, package, variable, constant, method etc. But, it is not forced to follow. So, it is known as convention not rule.

Advantage of naming conventions in java

By using standard Java naming conventions, you make your code easier to read for yourself and for other programmers. Readability of Java program is very important. It indicates that less time is spent to figure out what the code does.




Name                                                         Convention

class name                        Should start with uppercase letter and be a noun e.g. String, Color,
                                        Button, System, Thread etc.

interface name                   Should start with uppercase letter and be an adjective e.g. Runnable,
                                        Remote, ActionListener etc.

method name                    Should start with lowercase letter and be a verb e.g. actionPerformed(),
                                        main(), print(), println() etc.

variable name                   Should start with lowercase letter e.g. firstName, orderNumber etc.

package name                  Should be in lowercase letter e.g. java, lang, sql, util etc.

constants name                 Should be in uppercase letter. e.g. RED, YELLOW, MAX_PRIORITY etc.


Understanding CamelCase in java naming conventions

Java follows camelcase syntax for naming the class, interface, method and variable. If name is combined
with two words, second word will start with uppercase letter always e.g. actionPerformed(), firstName, ActionEvent, ActionListener etc.