Rules for identifier names (enforced by Java)

An identifier

is a unique name for a variable, constant, method, class or package
must not match a keyword (f. e. int)
is case-sensitive (selection and Selection are considered two different identifiers)

	Unique	Special rule	Explained in video*
Variable	unique in its scope		Lesson 23
Constant	unique in its scope		Lesson 236
Method	unique in its scope		Lesson 96
Class	unique in its package	has to match the filename	Lesson 146
Package	unique	has to match the directory structure	Lesson 184

Conventions for identifier names (recommended)

	Upper / lower case	Word separation	Mutations	Name usually contains	Examples	Explained in video*
Variable	Start with a lower case letter	CamelCase	No	noun	menuSelection, bestProgrammingLanguage	Lesson 23
Constant	Are all in upper case letters	Underscores	No	noun	SELECTION_MENU, MY_CONST_VALUE	Lesson 236
Method	Start with a lower case letter	CamelCase	No	verb	printMenu(), listVehicleCategories()	Lesson 96
Class	Start with an upper case letter	CamelCase	No	noun	VehicleTrade, MySpecialClass	Lesson 146
Package	Are all in lower case letters	Underscores	No		com.jtrainer.jnewcomers.vehicle_trade	Lesson 184

* Please buy the course Java for newcomers and log in to udemy.com to watch the explanation videos.

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