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public class Model extends Observable {
String[][] data;
List<Arbeitsmappe> AMList = new LinkedList<>();
.....
public void setAMList(List<Arbeitsmappe> aMList) {
AMList = aMList; //new List replace the old
this.getData(); //The 2dimensional Array is filled with the names from the list
setChanged(); 
notifyObservers(Controller.Command_Excel_Eingelesen);
}

    JTextField cellEditorTF = new JTextField();
    cellEditorTF.setEditable(false);
    DefaultCellEditor cellEditor = new DefaultCellEditor(cellEditorTF);
    ContentTable = new JTable(model.getData(), Model.columnNames);
    //Cell Editable FALSE
    ContentTable.getColumnModel().getColumn(0).setCellEditor(cellEditor);
    //Single Interval Selection 
    ContentTable.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
    //Cell Listener - When Cell is edited the new informationen is safed in AMLISt
    Action action = new AbstractAction()
        public void actionPerformed(ActionEvent e)
            TableCellListener tcl = (TableCellListener)e.getSource();
            Model.AMList.get(tcl.getRow()).Speichername = String.valueOf(tcl.getNewValue());
           // System.out.println("Row: " + tcl.getRow() + "  " + Model.data[tcl.getRow()][1]);
    TableCellListener tcl = new TableCellListener(ContentTable, action);
    JScrollPane scrollPane = new JScrollPane(ContentTable);
    ContentTable.setFillsViewportHeight(true);
    ContentTable.getTableHeader().setReorderingAllowed(false);
    this.add(BorderLayout.NORTH,ButtonPanel);
    this.add(BorderLayout.SOUTH,scrollPane);
@Override
public void update(Observable arg0, Object arg1) {
    if(arg0 instanceof Model){
        Model model = (Model) arg0;
        String cmd = (String) arg1;
        if(cmd.equals(Controller.Command_Excel_Eingelesen)){