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Cert Obj Recursively access a directory tree

[8.4.1] Objective Recursively access a directory tree using the DirectoryStream and FileVisitor interfaces.
[8.4.2] To list out all the users with a home directory on this computer. DirectoryStream<Path> stream = // use try with resources Files.newDirectoryStream(dir))
[8.4.3]There is one limitation with DirectoryStream. It can only look at one directory. One way to remember this is that it works like the dir command in DOS or the ls command in UNIX. Or you can remember that DirectoryStream streams one directory.
[8.4.4] There are two parameters to visitFile(). The first one is the Path object representing the current file. The other is a BasicFileAttributes interface. Lets you find out if the current file is a directory, when it was created, and many other similar pieces of data.
[8.4.5] Depth-first search Note that Java goes down as deep as it can before returning back up the tree. This is called a depth-first search. We said "might" because files and directories at the same level can get visited in either order.
[8.4.6] preVisitDirectory Called before drilling down into the directory
[8.4.7] visitFile Called once for each file (but not for directories)
[8.4.8] visitFileFailed Called only if there was an error accessing a file, usually a permissions issue
[8.4.9] postVisitDirectory Called when finished with the directory on the way back up
Created by: MVK2013