The names of variables in the Java language
are referred to as
Choosing a variable
The best naming convention is to
choose a variable name that will tell the reader of the
program what the variable represents. Variable names that describe the data stored at that
particular memory location are called
For example, if you wish to store a grade on a test, a
variable name such as grade
would be more easily remembered than a variable name such as
Rules for naming
variable names must begin with a letter of the alphabet, an
underscore, or ( _ ), or a dollar sign ($). The
convention is to always use a letter of the alphabet.
The dollar sign and the underscore are discouraged.
the first initial letter, variable names may also contain
letters and the digits 0 to 9. No spaces or special
characters are allowed.
name can be of any length, but don't get carried away.
Remember that you will have to type this name.
characters are distinct from lowercase characters. Using ALL
uppercase letters are primarily used to identify constant
variables. Remember that variable names are
cannot use a java keyword (reserved word) for a variable name.
Tip: Some programmers use underscore in
variable names to separate parts of the name, such as
Others prefer a "capital style" notation, such as
to separate parts of the name. NEVER use
uppercase for every letter in a variable name, because
uppercase names are reserved for final (constant) variables.
Samples of acceptable variable names:
Samples of unacceptable variable names: