#7(b) identifiers in java
Identifiers in Java are symbolic names used for identification. They can be a class name, variable name, method name, package name, constant name, and more. However, In Java, There are some reserved words that can not be used as an identifier.
Rules:
A valid identifier must have characters [A-Z] or [a-z] or numbers [0-9], and underscore(_) or a dollar sign ($).
There should not be any space in an identifier.
An identifier should not contain a number at the starting.
We can't use the Java reserved keywords as an identifier such as int, float, double, char, etc.