The JDK does not contain any methods to copy a File or to copy a folder/directory. (Well, unless some got added in JDK 5.0 - haven't looked in detail yet).
To copy a file, you need to create the new File on disk, open streams on the existing and new file and do a reading/writing loop to copy the data.
To copy a directory, you need to create the new Directory. Then get hold of the list of files in the existing directory. Then use the above method to copy each file.
Jakarta Commons library is a freely-available third-party library that contains utilities to help with this. Look at "Commons IO", and in particular FileUtils and CopyUtils classes. You can copy a file with these, but not a directory, I think.
Betty Rubble? Well, I would go with Betty... but I'd be thinking of Wilma.