Reader([Object lock])---|---BufferedReader(Reader in [, int size])------LineNumberReader(Reader in [, int size])
                        |
                        |---InputStreamReader(InputStream in------------FileReader(File file
                        |                     [, Charset cs                       |FileDescriptor fd
                        |                       |CharsetDecoder dec               |String fileName)
                        |                       |String charsetName])
                        |       
                        |---FilterReader(Reader in)---------------------PushbackReader(Reader in [, int size])
                        |
                        |---PipedReader([PipedWriter src])
                        |
                        |---StringReader(String s)
                        |
                        |---CharArrayReader(char[] buf [, int offset, int length])

Writer([Object lock])---|---BufferedWriter(Writer out [, int size]) 
                        |
                        |---OutputStreamWriter(OutputStream out---------FileWriter((File file|String fileName)
                        |                      [,Charset cs|                       [, boolean append]|FileDescriptor fd)
                        |                        CharsetEncoder enc|
                        |                        String charsetName])
                        |
                        |---FilterWriter(Writer out)
                        |
                        |---PipedWriter([PipedReader snk])
                        |
                        |---PrintWriter((OutputStream out|Writer out) [, boolean autoFlush])
                        |
                        |---CharArrayWriter([int initialSize])
                        |
                        |---StringWriter([int initialSize])

InputStream()-----------|---FileInputStream(File file|FileDescriptor fdObj|String name)
                        |
                        |-- PipedInputStream([PipedOutputStream src])
                        |
                        |---FilterInputStream(InputStream in)-----|-----LineNumberInputStream(InputStream in)
                        |                                         |
                        |                                         |-----DataInputStream(InputStream in)
                        |                                         |
                        |                                         |-----BufferedInputStream(InputStream in [, int size])
                        |                                         |
                        |                                         |-----PushbackInputStream(InputStream in [, int size])
                        |
                        |---ByteArrayInputStream(byte[] buf [, int offset, int length])
                        |
                        |---SequenceInputStream(Enumeration e|InputStream s1, InputStream s2)
                        |
                        |---StringBufferInputStream(String s)
                        |
                        |---ObjectInputStream([InputStream in])

OutputStream()----------|---FileOutputStream((File file|String name)[, boolean append]|FileDescriptor fdObj)
                        |
                        |---PipedOutputStream([PipedInputStream snk])
                        |
                        |---FilterOutputStream(OutputStream out)--|-----DataOutputStream(OutputStream out)
                        |                                         |
                        |                                         |-----BufferedOutputStream(OutputStream out [, int size])
                        |                                         |
                        |                                         |-----PrintStream(OutputStream out [, boolean autoFlush [, String encoding]])
                        |
                        |---ByteArrayOutputStream([int size])
                        |
                        |---ObjectOutputStream([OutputStream out])