org.apache.hadoop.fs
Interfaces 
PathFilter
PositionedReadable
Seekable
Classes 
ChecksumFileSystem
DF
FileSystem
FileUtil
FilterFileSystem
FSDataInputStream
FSDataOutputStream
FSInputStream
FsShell
InMemoryFileSystem
LocalFileSystem
Path
RawLocalFileSystem
Trash
Exceptions 
ChecksumException
Errors 
FSError