Please see the following code for an example. Changing the default chart data category labels. Output file attached.
public static void main(String[] args) throws Exception {
final Presentation pres = new Presentation();
final IChart c = pres.getSlides()
.get_Item(0)
.getShapes()
.addChart(
ChartType.ClusteredColumn,
0, 0, 720, 540);
final IChartDataWorkbook wb =
c.getChartData()
.getChartDataWorkbook();
wb.getCell(0, 1, 0, “1”);
wb.getCell(0, 2, 0, “2”);
wb.getCell(0, 3, 0, “3”);
wb.getCell(0, 4, 0, “4+”);
pres.save(“D:/test.pptx”, SaveFormat.Pptx);
Desktop.getDesktop().open(new File(“D:/test.pptx”));
}