程序包 java.lang.annotation

注释类型 Target

@Documented
@Retention(RUNTIME)
@Target(ANNOTATION_TYPE)
public @interface Target

Indicates the contexts in which an annotation type is applicable. The declaration contexts and type contexts in which an annotation type may be applicable are specified in JLS 9.6.4.1, and denoted in source code by enum constants of ElementType.

If an @Target meta-annotation is not present on an annotation type T , then an annotation of type T may be written as a modifier for any declaration except a type parameter declaration.

If an @Target meta-annotation is present, the compiler will enforce the usage restrictions indicated by ElementType enum constants, in line with JLS 9.7.4.

For example, this @Target meta-annotation indicates that the declared type is itself a meta-annotation type. It can only be used on annotation type declarations:

    @Target(ElementType.ANNOTATION_TYPE)
    public @interface MetaAnnotationType {
        ...
    }
 

This @Target meta-annotation indicates that the declared type is intended solely for use as a member type in complex annotation type declarations. It cannot be used to annotate anything directly:

    @Target({})
    public @interface MemberType {
        ...
    }
 

It is a compile-time error for a single ElementType constant to appear more than once in an @Target annotation. For example, the following @Target meta-annotation is illegal:

    @Target({ElementType.FIELD, ElementType.METHOD, ElementType.FIELD})
    public @interface Bogus {
        ...
    }
 

从以下版本开始:

1.5

必需元素概要

所需元素

限定符和类型	必需的元素	说明
ElementType[]	value	Returns an array of the kinds of elements an annotation type can be applied to.

元素详细资料

value

ElementType[] value

Returns an array of the kinds of elements an annotation type can be applied to.

返回:

an array of the kinds of elements an annotation type can be applied to