public class BarChartObject {

	private String yvalue;
	private String category;
	private Integer xvalue;

	public String getYvalue() {
		return this.yvalue;
	}

	public void setYvalue(final String yvalue) {
		this.yvalue = yvalue;
	}

	public String getCategory() {
		return this.category;
	}

	public void setCategory(final String category) {
		this.category = category;
	}

	public Integer getXvalue() {
		return this.xvalue;
	}

	public void setXvalue(final Integer xvalue) {
		this.xvalue = xvalue;
	}
}

//Erstellen Model und hinzufügen der Kategorien
final ChartModel model = ChartModel.New()
	.addColumn(Column.New(Type.STRING, "year", "Jahr"))
	.addColumn(Column.New(Type.NUMBER, "iphone", "iPhone"))
	.addColumn(Column.New(Type.NUMBER, "android", "Android"));

//Füllen der Items
model.addRow("2014", 1500, 1200);
model.addRow("2015", 805, 700);
model.addRow("2016", 920, 600);
model.addRow("2017", 1250, 1500);

//Setzen des Models
barChart.setModel(model);