for (Iterator<Stream> i = memberSet.iterator(); i.hasNext();) { Stream member = i.next();
for (Stream member : memberSet) {
	public void setClosed() {		if (!isClosed) {			isClosed = true;			for (Iterator<Stream> i = memberSet.iterator(); i.hasNext();) {				Stream member = i.next();				member.setClosed();			}		}	}