Java Reference
In-Depth Information
7\Projects\MoveAndCopyFiles\classes\junkDirBackup
Starting move files...
MoveAndCopyFiles.jcp moved.
MoveAndCopyFiles.jcu moved.
MoveAndCopyFiles.jcw moved.
src_moveandcopyfiles.txt moved.
You can look at the directory to verify that the move has worked.
Press Enter to continue.
Deleting D:\Beginning Java SE
7\Projects\MoveAndCopyFiles\classes\junkDir...
Deleting files from
D:\Beginning Java SE
7\Projects\MoveAndCopyFiles\classes\junkDirBackup...
MoveAndCopyFiles.jcp deleted.
MoveAndCopyFiles.jcu deleted.
MoveAndCopyFiles.jcw deleted.
src_moveandcopyfiles.txt deleted.
Deleting D:\Beginning Java SE
7\Projects\MoveAndCopyFiles\classes\junkDirBackup...
After execution finishes successfully, the directories and files that are created by the program will all
have been deleted.
How It Works
The
main()
method first creates a new subdirectory,
junkDir
, in the
current
directory by calling the
createSingleDirectory()
method. All the files in the
current
directory are then copied to
junkDir
by using the
copyFiles()
method. The program then pauses so you can inspect your file system to verify
that the copy has indeed been completed.
Another subdirectory to the current directory,
junkDirBackup
, is created, and all the files in
junkDir
are
moved to
junkDirBackup
. The program pauses once more to enable you to verify the move.
Finally the
main()
method deletes
junkDir
, deletes the files from
junkDirBackup
, and then deletes
junkDirBackup
.
Walking a File Tree
The
java.nio.file.FileVisitor<T>
interface specifies methods that you can use to walk through a
tree of directories and files.
T
is the type of file reference, usually type
Path
. The
java.nio.file.SimpleFileVisitor<T>
class implements the methods in the
FileVisitor<T>
interface
that simply visits all files in a tree and rethrows any I/O exceptions that occur. You can extend the
Sim-
pleFileVisitor<T>
class to override the
FileVisitor<T>
methods to do what you want.
The methods that are declared in the
FileVisitor<Path>
interface are called by another method that you
call to initiate the process of walking the file tree; this is the static
walkFileTree()
method that is defined
in the
Files
class. This then calls the
FileVisitor<Path>
interface methods, which are presented in
Table
