org.apache.hadoop.fs
Interfaces 
PathFilter
PositionedReadable
Seekable
Classes 
BufferedFSInputStream
ChecksumFileSystem
DF
DU
FileStatus
FileSystem
FileUtil
FileUtil.HardLink
FilterFileSystem
FSDataInputStream
FSDataOutputStream
FSInputChecker
FSInputStream
FSOutputSummer
FsShell
InMemoryFileSystem
LocalDirAllocator
LocalFileSystem
Path
RawLocalFileSystem
ShellCommand
Trash
Exceptions 
ChecksumException
Errors 
FSError