(1->2)字節流－>字符流
InputStream->InputStreamReader
OutputStream->OutputStreamWriter

(1)字節流
InputStream->
FileInputStream->BufferedInputStream
OutputStream->
FileOutputStream->BufferedOutputStream

(2)字符流
FileReader->
InputStreamReader->BufferedReader
FileWriter->
OutputStreamWriter->BufferedWriter


1.  字節流－>字符流

	//字節流
	InputStream		
					FileInputStream//文件
					DataInputStream//數據
					PipedInputStream//管道
					BufferedInputStream//緩沖
					ByteArrayInputStream//內存
					FilterInputStream//過濾
					LineNumberInputStream//
					ObjectInputStream//對象
					PushbackInputStream//
					SequenceInputStream//拼接
					StringBufferInputStream//
	OutputStream	
					FileOutputStream
					DataOutputStream
					PipedOutputStream
					BufferedOutputStream
					ByteArrayOutputStream
					FilterOutputStream
					ObjectOutputStream
					PrintStream
					


	//字符流
	Reader			
					InputStreamReader//從文件流讀入字符流
					CharArrayReader//從內存讀入字符流
					BufferedReader//緩沖
					FileReader//從文件讀入字符流
					LineNumberReader//
					PipedReader//從管道讀入字符流
					PushbackReader//
					StringReader//

	Writer
					OutputStreamWriter//從文件流輸出字符流
					CharArrayWriter//從內存輸出字符流
					BufferedWriter//緩沖
					FileWriter//從文件輸出字符流
					PipedWriter//從管道輸出字符流
					StringWriter//
					PrintWriter


	//文件類
	File
	FileDescriptor
	RandomAccessFile
	SerializablePermission 
	StreamTokenizer 

2.  位置不同

	//內存				
					ByteArrayInputStream
					ByteArrayOutputStream
	//管道
					PipedInputStream
					PipedOutputStream
					PipedReader
					PipedWriter
	//文件
					FileInputStream
					FileOutputStream
	
3.	進程（過濾，格式化，效果）

	//緩沖	
					BufferedInputStream
					BufferedOutputStream
					BufferedReader
					BufferedWriter
	//過濾
					FilterInputStream
					FilterOutputStream
	//數據
					DataInputStream
					DataOutputStream