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All classes extend the Object class.

Did you try Object vs ?

Are you closer to a solution now?

That looks like something used on a command line. What would the code for the java method look like? Would there be a method that has a filename and a value as args and writes that value in the...

So one of the methods would be to implement a "cd". Others would allow changing values of the fake files. I'd assume that would imply creating and deleting files.
For that do you mean that one...

By interface I meant what kind of methods do you want to have to use the filesystem? What would those methods do? How and why would application code use those methods?

What kind of interface to the "filesystem" are you looking for?
Sequential reads and writes?
Random reads and writes?
Keyed?