Java Module java.base Package java.lang.annotation Annotation Type Retention（JDK11）

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```
@Documented
@Retention(RUNTIME)
@Target(ANNOTATION_TYPE)
public @interface Retention
```
Indicates how long annotations with the annotated type are to be retained. If no Retention annotation is present on an annotation type declaration, the retention policy defaults to RetentionPolicy.CLASS.
A Retention meta-annotation has effect only if the meta-annotated type is used directly for annotation. It has no effect if the meta-annotated type is used as a member type in another annotation type.

Since:

1.5

See The Java™ Language Specification:

9.6.4.2 @Retention

Required Element Summary

Required Elements
Modifier and Type	Required Element	Description
`RetentionPolicy`	`value`	Returns the retention policy.

- Element Detail
  - value
```
RetentionPolicy value
```
    Returns the retention policy.
    
    Returns:
    
    the retention policy

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