Identifiers
All Java variables must be identified with unique names.
These unique names are called identifiers.
Identifiers can be short names (like x and y) or more descriptive names (age, sum, totalVolume).
Note: It is recommended to use descriptive names in order to create understandable and maintainable code:
Example:
your own Java Serverint minutesPerHour = 60;
// OK, but not so easy to understand what m actually is
int m = 60;
The general rules for naming variables are:
Names can contain letters, digits, underscores, and dollar signs
Names must begin with a letter
Names should start with a lowercase letter, and cannot contain whitespace
Names can also begin with $ and _
Names are case-sensitive ("myVar" and "myvar" are different variables)
Reserved words (like Java keywords, such as int or boolean) cannot be used as names
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