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Given, I know that <T> or <T, V extends Number> is the formal type parameter section. This is a declaration of the formal type parameter T ( type variables ). A type variable is an unqualified identifier used as a type in class, interface, static and non-static methods, and constructor bodies.

But I don't understand what means TypeParameter: {TypeParameterModifier} Identifier [TypeBound] in the documentation.

What does mean {}? Optional arguments?

What does mean []?

Where {} and [] in <T, V extends Number> ?

https://docs.oracle.com/javase/specs/jls/se8/html/jls-4.html#jls-4.4

TypeParameter:
  {TypeParameterModifier} Identifier [TypeBound]
TypeParameterModifier:
  Annotation
TypeBound:
  extends TypeVariable
  extends ClassOrInterfaceType {AdditionalBound}
AdditionalBound:
  & InterfaceType
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  • 2
    The notation of the language grammar is defined in #2.4: {x} means zero or more and [x] means zero or one. Note 'T extends Number' is part of a single TypeParameter in 4.4, but the < > around the list and any commas in it are defined in 8.1.2. Commented Nov 29, 2023 at 10:04
  • PS: 'java docs' in general mean any docs (documentation) about Java, but the term (and tag) 'javadoc' means specifically documentation of classes, methods, etc in a library, often but not only the standard library, extracted from special comments in the library source; this does not include the language definition, because the language definition is not extracted from comments in the source code of a library. Commented Nov 29, 2023 at 10:07
  • @dave_thompson_085, thank you! If you add answer - I'll take it like answer. Commented Nov 29, 2023 at 14:59
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