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How does it do that? Your description is generic and could apply to lots of methods.
What does it return after doing all that?

Yes, I have a reasonable understanding of what an interface is and how to use it.

My question is about the Measurable interface. What is it supposed to do? How and why would it be used?
Method...

What is supposed to be in the Object returned by measure? Why does the method return an Object instead of a specific class that has useful data and methods?

What happens when you compile the program? If there are errors, copy the full text and paste it here.
What is the program supposed to do? Where are the values to be displayed? What code is...