How to retrieve a list of directories QUICKLY in Java?

Question

Suppose a very simple program that lists out all the subdirectories of a given directory. Sound simple enough? Except the only way to list all subdirectories in Java is to u

Answer 1

there is also a recursive parallel scanning at http://blogs.oracle.com/adventures/entry/fast_directory_scanning. Essentially siblings are processed in parallel. There also encouraging performance tests.