Lexical Structure - The Java Language Specification - page 21

• i3
• αρετη
• MAX_VALUE
• isLetterOrDigit

3.9. Keywords

50 character sequences, formed from ASCII letters, are reserved for use as keywords and
cannot be used as identifiers (§ 3.8 ) .

Keyword: one of

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abstract continue for new switch

assert default if package synchronized

boolean do goto private this

break double implements protected throw

byte else import public throws

case enum instanceof return transient

catch extends int short try

char final interface static void

class finally long strictfp volatile

const float native super while

The keywords const and goto are reserved, even though they are not currently used.
This may allow a Java compiler to produce better error messages if these C++
keywords incorrectly appear in programs.
While true and false might appear to be keywords, they are technically Boolean literals
(§ 3.10.3 ) . Similarly, while null might appear to be a keyword, it is technically the null
literal (§ 3.10.7 ) .

3.10. Literals

A literal is the source code representation of a value of a primitive type (§ 4.2 ), the String
type (§ 4.3.3 ), or the null type (§ 4.1 ).

Literal:
IntegerLiteral
FloatingPointLiteral
BooleanLiteral