XYBarDataSeries barSeries = new XYBarDataSeries();
barSeries.add(new DataPointBar("a", 11));
barSeries.add(new DataPointBar("b", 14));
barSeries.add(new DataPointBar("c", 7));
barSeries.add(new DataPointBar("m", 14));
barSeries.add(new DataPointBar("n", 37));
barSeries.add(new DataPointBar("o", 4));
barSeries.add(new DataPointBar("p", -14));
barSeries.add(new DataPointBar("q", -54));
barSeries.add(new DataPointBar("t", -41));
barSeries.add(new DataPointBar("u", -13));
barSeries.add(new DataPointBar("v", 2));
barSeries.add(new DataPointBar("w", 3));
barSeries.add(new DataPointBar("x", 14));
barSeries.add(new DataPointBar("z", 41));

BarDisplayOptions barDisplayOptions = new BarDisplayOptions();

barDisplayOptions.positiveColor = Color.DARK_GRAY;
barDisplayOptions.negativeColor = Color.LIGHT_GRAY;

barSeries.setUpBarDisplayOptions(barDisplayOptions);

XYChart chart = new XYChart("Simple Bar Chart (+/- Color)",
"Commodity", "Price Change % (USD)", barSeries);