Recargar datos de una JTable

[chnn']

Porfavor, ayudenme.. este es el codigo de la tabla

public class MyTableModel extends AbstractTableModel {
final String[] columnNames = { "Codigo", "Nombre", "Marca", "Rubro","PrecioVenta", "PrecioCompra", "Stock", "ImpInternos","Iva" };



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


public int getRowCount() {
return dtarticulos.length;
}


public String getColumnName(int col) {
return columnNames[col];
}


public Object getValueAt(int row, int col) {
return dtarticulos[row][col];
}


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


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


public void setValueAt(Object value, int row, int col) {
dtarticulos[row][col] = value;
fireTableCellUpdated(row, col);
}

};


myModel = new MyTableModel();
table = new JTable(myModel);
scrollPane = new JScrollPane(table);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
dtarticulos = us.getarticulos();