Annotations
From Null-pointer
Simple example
package null-pointer; import java.lang.annotation.Documented; import java.lang.annotation.ElementType; import java.lang.annotation.Inherited; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Documented @Inherited @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.TYPE) public @interface Cache { String cacheName(); int timeToLiveSeconds() default -1; }
@Target
This states where the annotation is valid:
- ElementType.TYPE = class level
- ElementType.METHOD = method level
- ElementType.PARAMETER = parameter level
