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Java – lexical issues
This document discusses lexical elements in Java, including whitespace, identifiers, literals, comments, separators, and keywords. Whitespace includes spaces, newlines, and tabs. Identifiers name variables, methods, and classes, and cannot start with numbers or contain hyphens. Literals represent constant values like integers, floats, characters, and strings. Comments can be single-line, multiline, or documentation. Separators include commas, periods, and parentheses. There are a total of 50 keywords in Java.
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Java – lexical issues
- 1. Java – LexicalElements T S Pradeepkumar
- 2. Overview • White space •Identifiers • Literals • Comments • Separators • Keywords
- 3. White space Whitespace isjava may be • A space • A new line • A tab
- 4. Identifiers • Used fornaming variable names, method names and class names • Should not start with a number (as it confuse with a number) or there should not be any hyphen – in any identifiers. • Can start with o _ (underscore) o $ (dollar symbol) o Uppercase or lowercase alphabets Examples Audi count a7 $good this_is_ok
- 5. Literals It is aconstant created in Java. 88 is an integer 76.5 is a float „A‟ is a character “I am a string” is a string 88 76.5 „A‟ “I am a string”
- 6. Comments • Three types oSingle line comment (Similar like C++) • // o Multiline comment (similar like C++) /* --- --- */ o Documentation comment (useful for producing HTML documents) /** ----- ----- */
- 7.
- 8. Keywords (totally thereare 50)
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