列举常用的类方便查看，温故知新！
byte input byte output character input character output Basic InputStream OutputStream InputStreamReader OutputStreamWriter Array ByteArrayInputStream ByteArrayOutputStream CharArrayReader CharArrayWriter File FileInputStream FileOutputStream FileReader FileWriter Piped PipedInputStream PipedOutputStream PipedReader PipedWriter Buffered BufferedInputStream BufferedOutputStream BufferedReader BufferedWriter Filter FilterInputStream FilterOutputStream FilterReader FilterWriter String StringReader StringWriter Data DataInputStream DataOutputStream Object ObjectInputStream ObjectOutputStream byte input byte output character
阅读背景：
java IO 类概述表
来源：互联网
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