Identifiers in java:
A name in java programming is called identifier.
It can be class or method name or variable name
Example:
class Demo{
int sum;
public static void main(String[] args){
System.out.println("we are entering java world");
}
}
In above all red color words are identifiers.
Rules for defining variable:
1)Allowed characters in java identifiers are
1.a to z
2.AtoZ
3.0to9
4.'_'
5.$
if we are use any other character we will get compile time error.
2)Identifiers should not start with digit
ex:int 1a;(wrong)
ex2:int a1(correct)
3)java language is case sensitive
so int a,A; both are different identifiers
4)There is no length limit for java identifiers but it's not recommended to take more than 15 characters
5)we cant's use reserved word's as identifiers
ex: int if ;(wrong compile time error)
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