Abstracttablemodel Java, erst nach Klick auf Button füllen

class MyModel extends AbstractTableModel {
	public int getColumnCount() {
		return 6;
	}




	public int getRowCount() {
		return 6;
	}




	public String getColumnName(int c) {
		switch (c) {
		case 0:
			return "ID";
		case 1:
			return "Name";
		case 2:
			return "Vorname";
		case 3:
			return "Abteilung";
		case 4:
			return "Telefon";
		case 5:
			return "Mail";




		default:
			return null;
		}
	};




	public Object getValueAt(int row, int col) {
		return null;
	}

	public void setValueAt(Object s, int row, int col){
	    fireTableDataChanged();
	}

}

class MyModel extends AbstractTableModel {




	private List<String> columnNames = new ArrayList();
	private List<List> data = new ArrayList();




	{
		columnNames.add("ID");
		columnNames.add("Name");
		columnNames.add("Vorname");
		columnNames.add("Abteilung");
		columnNames.add("Telefon");
		columnNames.add("E-Mail");
	}




	public void addRow(List rowData) {
		data.add(rowData);
		fireTableRowsInserted(data.size() - 1, data.size() - 1);
		fireTableDataChanged();
	}




	public Object getValueAt(int row, int col) {
		return data.get(row).get(col);
	}




	public boolean isCellEditable(int row, int col) {
		return false;
	}




	public Class getColumnClass(int c) {
		return getValueAt(0, c).getClass();
	}




	public int getColumnCount() {
		return columnNames.size();
	}




	public int getRowCount() {
		return data.size();
	}




	public String getColumnName(int col) {
		try {
			return columnNames.get(col);
		} catch (Exception e) {
			return null;
		}
	}




}