@Retention(value=RUNTIME) @Target(value={FIELD,METHOD}) public @interface Key
Sets the Key for type conversion.
Annotation usage:
The Key annotation must be applied at field or method level.
Annotation parameters:
| Parameter | Required | Default | Description | 
|---|---|---|---|
| value | no | java.lang.Object.class | The key property value. | 
Example code:
 
 // The key property for User objects within the users collection is the userName attribute.
 @Key( value = java.lang.Long.class )
 private Map<Long, User> userMap;
 
 public abstract Class value
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