Java Reference
In-Depth Information
public @interface Unfinished {
String message() default "Nothing has been
Onceyoudeclareyourannotation, youmustnowdefineitscharacteristics.Thebasic
in the java.lang.annotation package. These annotations are as follows:
@Target : This is used to define the element types that can be annotated
(such as class, method, and attribute), for example @Tar-
get({ElementType.METHOD, ElementType.TYPE})
@Retention : This is used to define the retention level (such as RUNTIME ,
CLASS , or SOURCE ) of your annotation, for example @Reten-
@Inherited : This is used to say that the annotation will be automatically
applied to classes that inherit from the class that has the annotation
@Documented : This is used to make your annotation appear in the Javadoc
of the code that contains it
the @ScopeType ) in the case of custom CDI scope annotations.
After all changes, our annotation takes the form shown in the following code. Accord-
ing to the settings, this annotation can decorate methods, types of objects (such as
class , interface , or enum ) and attributes. It will be removed at the compile time
(because the retention level is SOURCE ).
@Target({ElementType.METHOD, ElementType.TYPE,
public @interface Unfinished {
String message() default "Nothing has been
The following code demonstrates the usage of the Unfinished annotation:
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