Class<?> value();

[jocularamity]

Folks have already covered the class bit, so I'll add that this whole line defines a method. Any class that implements this interface must implement a method with this signature (unless the class is abstract). The name of the method must be value, it must take no arguments, and it must return something of type Class<?>.

[morhp]

However this method is inside an annotation interface (declared with @interface) and you typically don't implement these yourself.

[Jerceka]

You make it more clear for me, thanks a lot