The type of element that an annotation can be applied to can be restricted using the @Target meta-annotation.

The @Target declaration takes the form of @Target(ElementType.<ELEMENT_TYPE>), where <ELEMENT_TYPE> is an element type from a predefined list. The available elements are:

1. ANNOTATION_TYPE
   
2. CONSTRUCTOR
3. FIELD
4. LOCAL_VARIABLE
5. METHOD
6. PARAMETER
7. TYPE (any type of element)

For example:

@Target(ElementType.CONSTRUCTOR)

The annotation that is annotated with this will only be able to be applied to constructors.

Note Java annotations restrictions