This week's book giveaways are in the iOS and Features new in Java 8 forums. We're giving away four copies each of Barcodes with iOS: Bringing together the digital and physical worlds and Core Java for the Impatient and have the authors on-line! See this thread and this one for details.
You now know how to copy one file to another. Copying a file to a folder simply means creating a new File object based on the two:
Combine that with File.listFiles() and you should be able to handle it.