- All Known Implementing Classes:
This class has two methods, both specified as optional. This apparently bizarre
behaviour is necessary because of wrapper classes which use reflection
to support those methods (see, e.g.,
lengthlong length() throws IOExceptionReturns the overall length of this stream (optional operation). In most cases, this will require the stream to perform some extra action, possibly changing the state of the input stream itself (typically, reading all the bytes up to the end, or flushing on output stream). Implementing classes should always document what state will the input stream be in after calling this method, and which kind of exception could be thrown.
positionlong position() throws IOExceptionReturns the current position in this stream (optional operation).
Usually, the position is just the number of bytes read or written since the stream was opened, but in the case of a
RepositionableStreamit represent the current position.