2.1. Basic Language Elements
Like any other programming language, the Java programming language is defined by grammar rules that specify how syntactically legal constructs can be formed using the language elements, and by a semantic definition that specifies the meaning of syntactically legal constructs.
Lexical Tokens
The low-level language elements are called lexical tokens (or just tokens for short) and are the building blocks for more complex constructs. Identifiers, numbers, operators, and special characters are all examples of tokens that can be used to build high-level constructs like expressions, statements, methods, and classes.
Identifiers
A name in a program is called an identifier. Identifiers can be used to denote classes, methods, ...
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