CareerCup

:o :O

I would go about starting off with a FS interface like:

interface Node {
String getName();
BufferedInputOutputStream getDataStream();
}

interface FS {
public Node openFile(String path, int params);
public void closeFile(Node);
public List<Node> listNodes(String path);
}

Then going about and implementing a specific nodetype and a specific FS.

The point is to leave out too many details and focus on what is important

FileSystem -- has Entries
File extend Entry
Folder extends Entry
Folder has File