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Java AnnotationsAnnotations provide data about a program that is not part of the program itself.They have no direct effect on the operation of the code they annotate. Example:
@Author
(
name = "Benjamin Franklin",
date = "3/27/2003"
)
class MyClass() {
}
Brackets may be omitted if there are no elements. Example : @Override Three annotations are provided by the language itself:
The type of annotation can be defined as an annotation type. The syntax for doing this is:
// Definition of a new annotation
@interface ClassPreamble
{
String author();
String date();
int currentRevision() default 1;
String lastModified() default "N/A";
String lastModifiedBy() default "N/A";
String[] reviewers(); // Note use of array
}
// Using the new annotation
@ClassPreamble
(
author = "John Malkovich",
date = "01/03/2012",
currentRevision = 20,
lastModified = "4/12/2014",
lastModifiedBy = "Jane Handerson",
reviewers = {"Mike", "Bob", "Peter"} // Note array notation
)
public class SomeClass extends Generation2List { ... }
For multi-threading applications, JCIP provides a few handy annotations. |
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