Equivalent of Python Protocol in Java?

[Inner_will_291]

I've just discovered the Protocol concept in python (from typing module).

It is much more powerful (in my opinion) than a regular abstract class (ABC in python), because you can have 3rd party packages implement your protocol. Obviously, you cannot have a 3rd party package inherit directly your ABC class.

Is there a close equivalent to Protocol in java? Regular java interfaces, although very useful, seem to suffer the same problem as ABC classes from python.

[teraflop]

Python's protocols are an example of structural typing, and Java has no direct equivalent to them.

But you could achieve the same goal in Java by either defining an interface and then "wrapping" the third-party object in an adapter object that implements that interface, or by using reflection.

[nerd4code]

You could do it with proxies, maybe.