public class BufferedOutputStream : FilterOutputStream, Seekable
Buffered output stream implements FilterOutputStream and provides for buffered writes.
By default, BufferedOutputStream's buffer size is set at 4 kilobytes.
To get the size of a buffer within a buffered input stream, use get_buffer_size. To change the size of a buffered output stream's buffer, use set_buffer_size. Note that the buffer's size cannot be reduced below the size of the data within the buffer.