private static XYDataset createForceDataset(int i) { TimeSeriesCollection timeseriescollection = new TimeSeriesCollection(); TimeSeries timeseries = new TimeSeries("Wind Force", org.jfree.data.time.Minute.class); Object obj = new Minute(); double d = 3D; for (int j = 0; j < i; j++) { timeseries.add(((RegularTimePeriod) (obj)), d); obj = ((RegularTimePeriod) (obj)).next(); d = Math.max(0.5D, d + (Math.random() - 0.5D) * 0.5D); } timeseriescollection.addSeries(timeseries); return timeseriescollection; }