This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
It looks like a mistake to me. It means, if you can't find a class, go and look in the package called java.io.File. Obviously all classes were found, so the compiler didn't have to look in that package. I think it was supposed to have the keyword static in there somewhere.