public class LineChartObject {

	private String category;
	private String y_axis;
	private Integer x_axis;

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

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

	public String getY_axis() {
		return this.y_axis;
	}

	public void setY_axis(final String y_axis) {
		this.y_axis = y_axis;
	}

	public Integer getX_axis() {
		return this.x_axis;
	}

	public void setX_axis(final Integer x_axis) {
		this.x_axis = x_axis;
	}
}

//Erstellen Model und hinzufügen der Kategorien
final ChartModel model = ChartModel.New()
    .addColumn(Column.New(Type.STRING, "year", "Jahr"))
    .addColumn(Column.New(Type.NUMBER, "sales", "Verkäufe"))
    .addColumn(Column.New(Type.NUMBER, "customer", "Kunden"));
 
//Füllen der Items
model.addRow("2013", "6500", 6500);
model.addRow("2014", "4321", 4321);
model.addRow("2015", "9460", 9460);
model.addRow("2016", "7450", 7450);
         
model.addRow("2013", "1500", 1500);
model.addRow("2014", "2850", 2850);
model.addRow("2015", "685", 685);
model.addRow("2016", "4850", 4850);
 
//Setzen des Models
lineChart.setModel(model);