This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
The java.io.File class has a list() method and a listFiles() method, either of which can list the contents of a directory. There's also an isDirectory() method to tell you which Files are actually Directories.