public void sortShows(Vorstellung[] shows)
	{
		Boolean done = true;
		Vorstellung dummy;
		do
		{
			done = true;
			for (int i = 0; i < (shows.length - 1); i++)
			{
				 if (shows[i].gibDatum().compareTo(shows[i+1].gibDatum()) > 0)
				 {
					 dummy = shows[i+1];
					 shows[i+1] = shows[i];
					 shows[i] = dummy;
					 done = false;
				 }
				 if (shows[i].gibDatum().compareTo(shows[i+1].gibDatum()) == 0)
				 {
					 if (shows[i].gibAnfangszeit().compareTo(shows[i+1].gibAnfangszeit()) > 0)
					 {
						 dummy = shows[i+1];
						 shows[i+1] = shows[i];
						 shows[i] = dummy;
						 done = false;
					 }
				 }
			}
		} while (done == false);
	}