This class is the superclass of all classes that filter output streams. These streams sit on top of an already existing output stream (the underlying output stream) which it uses as its basic sink of data, but possibly transforming the data along the way or providing additional functionality.
The class FilterOutputStream itself simply overrides
all methods of OutputStream with versions that pass
all requests to the underlying output stream. Subclasses of
FilterOutputStream may further override some of these
methods as well as provide additional methods and fields.
extends