@Override
public Chart getChart() {
// Create Chart
Chart chart = new ChartBuilder().chartType(ChartType.Area).width(800).height(600).title(getClass().getSimpleName()).xAxisTitle("X").yAxisTitle("Y").build();
chart.addSeries("a", new double[] { 0, 3, 5, 7, 9 }, new double[] { -3, 5, 9, 6, 5 });
chart.addSeries("b", new double[] { 0, 2, 4, 6, 9 }, new double[] { -1, 6, 4, 0, 4 });
chart.addSeries("c", new double[] { 0, 1, 3, 8, 9 }, new double[] { -2, -1, 1, 0, 1 });
// Customize Chart