Rules and conventions for naming a variable in Java

Variable name can be of unlimited length of letter and digits.
Variable name can start with $ or _ but not advisable.
Variable name should not start with numbers.
Variable name is case-sensitive.
Whitespace or space is not permitted.
Name should not be a keyword in Java.

If you want to look list of keywords in Java, click here.

What is a variable or datatype and why they are used detailly ?

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