THE Java™ Programming Language, Fourth Edition by By Ken Arnold James Gosling David Holmes

Author:By Ken Arnold, James Gosling, David Holmes [By Ken Arnold, James Gosling, David Holmes]
Language: rus
Format: epub
ISBN: 0321349806
Publisher: Addison Wesley Professional
Published: 0101-01-01T00:00:00+00:00

15.3. Annotating Elements

The program elements that can be annotated are all those for which modifiers can be specified: type declarations (classes, interfaces, enums, and annotation types), field declarations, method and constructor declarations, local variable declarations, and even parameter declarations. There is also a special mechanism to annotate packages, described in Section 18.5 on page 476.

As you have seen, to annotate an element you provide the name of the annotation type being applied, preceded by @ and followed by a parenthesized list of initializers for each element of the annotation type. A given program element can only be annotated once per annotation type.

If the annotation type is a marker annotation or if all its elements have default values, then the list of initializers can be omitted. For example, you can mark a method as deprecated:

@Deprecated public void badMethod() { /* ... */ }

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