public class Simulation
{

    // Einstellungen:

    public final static int ANZ_ZUEGE = 3;
    public final static int ANZ_SEGMENTE = 6;

    public static void main(String[] args)
    {
        Strecke ab = new Strecke(ANZ_SEGMENTE);



        Streckenwachter sw = new Streckenwachter(ab);
        sw.write(3);
        sw.start();

        for(int i=1; i<=ANZ_ZUEGE; i++)
        {
//          Varianten:
            // Züge starten im Osten
            // Zugfahrt eineZugfahrt= new Zugfahrt(ab, i, true);

            // Züge abwechselnd aus Osten oder Westen
            Zugfahrt eineZugfahrt= new Zugfahrt(ab, i, (i%2==0));
            eineZugfahrt.read();
            eineZugfahrt.start();
        }
     }
}

--------------------------------------


public class Streckenwachter extends Thread
{


    ......

    public void write(int x) {
        try {
            DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

            Document doc = docBuilder.newDocument();
            Element rootElement = doc.createElement("message");
            doc.appendChild(rootElement);

            Date datum = new Date();
            Timestamp stamp = new Timestamp(datum.getTime());

            Element uhrzeit = doc.createElement("Datum_und_Uhrzeit");
            uhrzeit.appendChild(doc.createTextNode(stamp.toString()));
            rootElement.appendChild(uhrzeit);

            Element zugnummer = doc.createElement("Zugnummer_Request");
            zugnummer.appendChild(doc.createTextNode(Integer.toString(x)));
            rootElement.appendChild(zugnummer);



            /*Element sequenz = doc.createElement("Sequenz");
            sequenz.appendChild(doc.createTextNode("Sequenztest"));
            rootElement.appendChild(sequenz);*/

            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(doc);
            StreamResult result = new StreamResult(new File("message.xml"));

            transformer.transform(source, result);
            System.out.println("Datei gespeichert");
        }
        catch(ParserConfigurationException pce) { System.out.println("ParserConfiguration failed"); }
        catch(TransformerException tfe) { System.out.println("Transformer failed"); }
        }
    }

----------------------------------------------


public class Zugfahrt extends Thread
{
    ......

    public void read() {
        try {
            File file = new File("message.xml");
            DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            Document doc = docBuilder.parse(file);

            System.out.println("Informationen Message:");

            if(doc.hasChildNodes()) {
                printen(doc.getChildNodes());
            }
        }
        catch(Exception e) { System.out.println(e.getMessage()); }


    }

    private static void printen(NodeList list) {

        for(int i=0; i < list.getLength(); i++) {

            Node tempNode = list.item(i);

            if(tempNode.getNodeType()==Node.ELEMENT_NODE) {
                if(!tempNode.getNodeName().equals("message")) {
                    System.out.println("-> " + tempNode.getNodeName() + ":");
                    System.out.println(tempNode.getTextContent());
                }
            }

            if(tempNode.hasChildNodes()) {
                printen(tempNode.getChildNodes());
            }

        }
    }


}