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("d", 30));
barSeries.add(new DataPointBar("e", 18));
barSeries.add(new DataPointBar("f", 21));
barSeries.add(new DataPointBar("h", 22));
barSeries.add(new DataPointBar("i", 14));
barSeries.add(new DataPointBar("j", 67));
barSeries.add(new DataPointBar("k", 87));
barSeries.add(new DataPointBar("l", 94));
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("r", -51));
barSeries.add(new DataPointBar("s", -45));
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("y", 11));
barSeries.add(new DataPointBar("z", 41));

BarDisplayOptions barDisplayOptions = new BarDisplayOptions();

barDisplayOptions.setGradiantRule(
new GradiantRule(0, 100, Color.BLUE, Color.RED));

barSeries.setUpBarDisplayOptions(barDisplayOptions);

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