Creates a <code>FilterInputStream</code>
by assigning the argument <code>inputStream</code>
to the field <code>this.inputStream</code> so as
to remember it for later use.
@param inputStream the underlying input stream, or <code>null</code> if
this instance is to be created without an underlying stream.
Creates a <code>FilterInputStream</code> by assigning the argument <code>inputStream</code> to the field <code>this.inputStream</code> so as to remember it for later use.
@param inputStream the underlying input stream, or <code>null</code> if this instance is to be created without an underlying stream.