What are mock objects in Java?

Question

I like to know what mock objects are in Java. Why do we create them and what are their uses?

Answer 1

Mock objects let you simulate and verify real objects, without actually running the real code in those objects. You can set up a mock to return specific results on method calls, you can verify that a method was or wasn't called, and other cool stuff.

Mockito is a very simple and straightforward Java mock object library.