注释 object 是否扩展了 Z93F725A07423FE1C8896ZF448B33D21 中的 Object class？

Question

I know that an annotation object is created implicitly by the JVM. Also, I know that all objects in java inherit the superclass Object. However, if by reflection you retrieve an annotation object, it doesn't seem to have the methods finalise() and clone() which are defined by the Object class in java. Does an annotation object indeed inherit the Object class? Is there a reason why an annotation object doesn't define those methods?

An example code snippet here:

Class<autobot> jane = autobot.class;
about frank = jane.getAnnotation(about.class);
frank.clone();      // This generates an error
frank.finalize();  //  This generates an error

Where " autobot " is an annotated class and " about " is the annotation type.

Answer 1

It does. clone() and finalize() aren't public. This doesn't work either:

Object o = new Object();
o.clone(); // nope
o.finalize(); // nope

It may work on certain classes. For example, this DOES work:

ArrayList<String> o = new ArrayList<String>();
o.clone();

That's simply because class ArrayList itself has overridden the clone() method and made it public . You can override a method and make it more public (you can't make em less public).

The type def of an annotation doesn't make anything more public.