@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (!(obj instanceof AnnouncementInstance))
			return false;
		AnnouncementInstance other = (AnnouncementInstance) obj;
		if (announcement == null) {
			if (other.announcement != null)
				return false;
		} else if (!announcement.equals(other.announcement))
			return false;
		if (receiver == null) {
			if (other.receiver != null)
				return false;
		} else if (!receiver.equals(other.receiver))
			return false;
		return true;
	}