[Java] I/O Stream and Reader/Writer

Fours class basic : 
    InputStream / OutputStream : IO byte stream, non coding(non ASCII , UNICODE...)
    Reader/Writer : IO character stream, with coding 

node stream :  can write to or read from some places : File, Networks, ....
process stream : a reference and encapsulation of an existent stream

		InputStream	OutputStream	Reader	Writer
node stream	file	FileInputStream	FileOutputStream	FileReader	FileWriter
	Array	ByteArray...	ByteArray...	ByteArray...	ByteArray...
	String	null	null	StringReader	StringWriter
	pipe	Piped...	Piped...	Piped...	Piped...
process stream	switch	null	null	InputStreamReader	OutputStreamWriter
	Buffer	Buffered...	Buffered...	Buffered...	Buffered...
	Data	Data ...	Data ...	null	null
	Object	Object...	Object...	null	null
	Print	null	Print...	null	Print...