public PeriodAxisDemo2(String s) { super(s); XYDataset xydataset = createDataset(); JFreeChart jfreechart = createChart(xydataset); ChartPanel chartpanel = new ChartPanel(jfreechart); chartpanel.setPreferredSize(new Dimension(500, 270)); chartpanel.setMouseZoomable(true, true); setContentPane(chartpanel); }