Reads the next byte of data from the input stream. The value byte is
returned as an
int in the range
255. If no byte is available because the end of the stream
has been reached, the value
-1 is returned. This method
blocks until input data is available, the end of the stream is detected,
or an exception is thrown.
A subclass must provide an implementation of this method.
-1 if the end of the
stream is reached.
|if an I/O error occurs.|