我可以在Java中为“类”而不是“对象”定义“接口”吗？

Question

We know 'interface' in java provide a common way to access objects who implementing it, but i wonder if there's a way like interface which not just for accessing the object's method, but also for accessing the class's method(static method). I want to use it to invoke an array of different classes's static factory method. Does java provide something like it?

Answer 1

No.

But you can implement the pattern you describe easily with an ordinary object interface, then a set of classes that just wrap the static methods you wish to call through to.

Answer 2

If your intentions is to call static method of an implementing class using Interface reference, the answer is No. static members belong to class only, so you will always need a Class type reference (actually it should be the class name) to access them.

With interfaces you can only point to what you have declared in it.

Answer 3

No, there's no kind of "interface for static methods" in Java.

(Aside from anything else, how would you expect to specify the class in question? Even generics wouldn't help here due to type erasure.)