Java Reference
In-Depth Information
}
}
WhenI,forexample,specify
java Dir c:\windows bmp
onmyXPplatform,
Dir
outputsonlythose
\windows
directoryfilenamesthathavethe
bmp
(bitmap)ex-
tension:
Blue Lace 16.bmp
Coffee Bean.bmp
FeatherTexture.bmp
Gone Fishing.bmp
Greenstone.bmp
Prairie Wind.bmp
Rhododendron.bmp
River Sumida.bmp
Santa Fe Stucco.bmp
Soap Bubbles.bmp
winnt.bmp
winnt256.bmp
Zapotec.bmp
The overloaded
listFiles()
methods return arrays of
File
s. For the most
part, they're symmetrical with their
list()
counterparts. However,
listFiles(FileFilter)
introduces an asymmetry.
The
java.io.FileFilter
interface declares a single
boolean ac-
cept(String pathname)
method that's called for each file/directory located in
the directory identified by the
File
object's abstract pathname. The argument passed
to
pathname
identifies the complete path of the file or directory.
The
accept()
method uses this argument to determine whether or not the file or
directorysatisfiesitscriteriaforwhatisacceptable.Itreturnstruewhenthefile/direct-
ory name should be included in the returned array; otherwise, this method returns false.
Tip
Becauseeachinterface's
accept()
methodaccomplishesthesametask,you
mightbewonderingwhichinterfacetouse.Ifyoupreferapathbrokenintoitsdirectory
and name components, use
FilenameFilter
. However, if you prefer a complete
pathname,use
FileFilter
;youcanalwayscall
getParent()
and
getName()
to get these components.
