Java I/O操作，字节流InputStream和OutputStream，字符流Reader和Writer，Java I/O库的设计原则，字符集的编码，RandomAccessFile类，管道流，对象的序列化。-Java I/O operations, byte streams InputStream and OutputStream, character stream Reader and Writer, Java I/O library design principles, character set encoding, RandomAccessFile class, pipe flow, object serialization.