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Java
identifiers
In java every
name is called identifier such as,Class-name,Method-name,Variable-name…etc
Identifier
Example
The example
of identifier are listed below
public class Testing
{
public static void main(String[] args)
{
int a=10;
}
}
In Above Example
there are 5 Identifier are used which listed below
Test -> Represent Class name
main -> Represent method name
String -> Represent predefined class name
args -> Represent
variable name
a -> Represent
variable name
Rules and
Regulation to declare identifier in java
Follow the
below steps to declare the identifier in java
Rule-1
An
identifier contains group of Uppercase & lower case characters, numbers,
underscore& dollar
sign
characters but not start with number.
int abc=10;
--->valid
int
_abc=30;--->valid
int $abc=40;--->valid
int
a-bc=50;--->not valid
int 2abc=20; ---> Invalid
int not/ok=100 --->invalid
Rule-2.
Java
identifiers are case sensitive of course java is case sensitive programming
language. The
below three
declarations are different & valid.
class Qa
{
int a=10;
Int A=20;
}
Rule-3.
The identifier must be unique.(duplicates are not allowed)
Class A{}
Class A{}
Rule-4.
It is
possible to use predefined class names & interfaces names as a identifier
but it is not
recommended.
class Qa
{
public
static void main(String[] args)
{
int String=10;
intSerializable=20;
System.out.println(String);
System.out.println(Serializable);
}
}
Rule-5
It is not
possible to use keywords as a identifiers.
int if=10;
int try=20; //Invalid
Rule-6.
There is
no length limit for identifiers but is never recommended to take lengthy names
because
it reduces
readability of the code.
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