// Instantiating a Workbook object
Workbook workbook = new Workbook();

// Obtaining the reference of the first worksheet
WorksheetCollection worksheets = workbook.getWorksheets();
Worksheet sheet = worksheets.get(0);

// Adding some sample value to cells
Cells cells = sheet.getCells();
Cell cell = cells.get("A1");
cell.setValue(50);
cell = cells.get("A2");
cell. setValue (100);
cell = cells.get("A3");
cell.setValue(150);
cell = cells.get("B1");
cell.setValue(4);
cell = cells.get("B2");
cell.setValue(20);
cell = cells.get("B3");
cell.setValue(50);

ChartCollection charts = sheet.getCharts();

// Adding a chart to the worksheet
int chartIndex = charts.add(ChartType.PYRAMID,5,0,15,5);
Chart chart = charts.get(chartIndex);

// Adding NSeries (chart data source) to the chart ranging from "A1" cell to "B3"
SeriesCollection serieses = chart.getNSeries();
serieses.add("A1:B3", true);

// Saving the Excel file
workbook.save("Chart_Aspose.xls");