Identifiers

Identifier is a name given to a class, variable, constant or method.

Rules for Declaring a Legal Identifier:

1.  Identifier must start with a letter, $, _. Cannot start with number.
2.  After the first letter, contain numeric.
3.  No Limit to the number of characters an identifier can contain.
4.  Cannot use keyword in identifier name.
5.  Identifiers are case-sensitive.

Example of legal identifiers

int _a;

int $count;

int ____ag_e;

int _$;

int detaild_name_for_identifier;

 

Example of illegal identifiers

int :a;

int -count;

int age#;

int .first;

int 3s;