是否可以为另一个注释类型的注释字段指定默认值？

Question

public @interface InnerAnnotation {
    String value() default "hello";
}

public @interface OuterAnnotation {
    InnerAnnotation value() default ???
}

And one more case :

public @interface AnotherOuterAnnotation {
    InnerAnnotation[] value() default ??? UPD: {} 
}

Answer 1

Yes, its possible:

public @interface InnerAnnotation {
    String value() default "hello";
}

public @interface OuterAnnotation {
    InnerAnnotation value() default @InnerAnnotation(value = "Goodbye");
}