Web Reference: You cannot use keywords like int, for, class, etc as variable name (or identifiers) as they are part of the Java programming language syntax. Here's the complete list of all keywords in Java programming. Jan 14, 2026 · The only allowed characters for identifiers are all alphanumeric characters ( [A-Z], [a-z], [0-9]), '$' (dollar sign) and '_' (underscore). For example, "geek@" is not a valid Java identifier as it contains a '@', a special character. Java has a set of keywords that are reserved words that cannot be used as variables, methods, classes, or any other identifiers: A non-access modifier. Used for classes and methods: An abstract class cannot be used to create objects (to access it, it must be inherited from another class).
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