Package: groovy.transform

## [Java] Annotation Type Final

- groovy.transform.Final

-     @Documented
      @Retention(RetentionPolicy.SOURCE)
      @Target({ElementType.TYPE, ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.FIELD})
      public @interface Final

  Annotation to add the final modifier to classes, methods, constructors, and fields. Using ``final`` and directly using ``@Final`` will have the same result. However, the intention is almost never to use ``@Final`` directly but rather as part of an annotation collector (meta-annotation). If you like the behavior of an existing annotation but would really like a version that also ensured the respective annotated node was final, you can create such an element, e.g.:

       @AnnotationCollector
       @Canonical
       @Final
       @interface MyCanonical {}

       @MyCanonical class Foo {}

  Here, class `Foo` will be final as well as having all the normal `Canonical` enhancements.

  Similarly, if you wanted to, you could define:

       @AnnotationCollector([Singleton, Final]) @interface MySingleton {}

  Classes annotated with @MySingleton would be final as well as have all the `Singleton` enhancements.

  As another example, you could define:

       @AnnotationCollector([NullCheck, Final, AutoFinal]) @interface MyNullCheck {}

  Methods annotated with @MyNullCheck would be final (from @Final), would have all parameters marked final (from @AutoFinal), and would have all parameters checked against `null` (from @NullCheck). In general, it would be bad style to have an explicit `final` modifier and a `@Final` annotation (or more than one `@Final` annotation), but in that scenario if there is an explicit `final` or at least one enabled `@Final`, then the annotated class or member will be final.
  Since:
    4.0.0

- - ### Element Summary

    Optional Element Summary
    Type | Name and Description
    --- | ---
    `boolean` | `enabled` When disabled, this annotation effectively becomes a no-op.

  - ### Inherited Methods Summary

    Inherited Methods
    Methods inherited from class | Name
    --- | ---
    `class Object` | `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Element Detail

    - #### public boolean enabled

      When disabled, this annotation effectively becomes a no-op. Typically only used to override an annotation collector already containing an enabled `@Final` annotation. Care must be taken when disabling final in this way since the annotation collector probably had good reason for enabling final.

      Default:
        true