org.apache.hadoop.fs
Interfaces 
CanSetDropBehind
CanSetReadahead
FsConstants
PathFilter
PositionedReadable
Seekable
Syncable
VolumeId
Classes 
AbstractFileSystem
AvroFSInput
BlockLocation
BlockStorageLocation
ChecksumFileSystem
CommonConfigurationKeysPublic
ContentSummary
FileChecksum
FileContext
FileStatus
FileSystem
FileUtil
FilterFileSystem
FSDataInputStream
FSDataOutputStream
FsServerDefaults
FsStatus
GlobFilter
HdfsVolumeId
LocalFileSystem
LocatedFileStatus
Options
Path
RawLocalFileSystem
Trash
TrashPolicy
Enums 
CreateFlag
Exceptions 
ChecksumException
FileAlreadyExistsException
InvalidPathException
ParentNotDirectoryException
UnsupportedFileSystemException
Errors 
FSError