Why can't we mock a final class?

Question

I am new to Java and haven't done much of unit testing in general.
Can someone tell me why final classes cannot be mocked?

Answer 1

Most common mocking framework in the java world cannot mock final classes/methods because they are typically based on creating proxies. Creating proxies for final classes is not possible as we cannot subclass (extends) a final class.

However, there are some workarounds and solutions, many of which can be found here.