[ I/O Stream ] byte Stream char Stream > 2byte씩 읽고 쓰기 InputStream BufferedInputStream(InputStream in) FileInputStream DataInputStream ObjectInputStream Reader BufferedReader FileReader InputStreamReader(형변환 연결) OutputStream BufferedOutputStream(OutputStream in) FileOutputStream DataOutputStream ObjectOutputStream Writer BufferedWriter FileWriter OutputStremReader(형변환 연결) * System.in ==> InputStr..