Example:

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

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

//Adding a sample value to "A1" cell
worksheet.getCells().get("A1").putValue(50);

//Adding a sample value to "A2" cell
worksheet.getCells().get("A2").putValue(100);

//Adding a sample value to "A3" cell
worksheet.getCells().get("A3").putValue(150);

//Adding a sample value to "B1" cell
worksheet.getCells().get("B1").putValue(60);

//Adding a sample value to "B2" cell
worksheet.getCells().get("B2").putValue(32);

//Adding a sample value to "B3" cell
worksheet.getCells().get("B3").putValue(50);

//Adding a chart to the worksheet
int chartIndex = worksheet.getCharts().add(ChartType.COLUMN, 5, 0, 25, 10);

//Accessing the instance of the newly added chart
Chart chart = worksheet.getCharts().get(chartIndex);

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

chart.setShowDataTable(true);

//Getting Chart Table
ChartDataTable chartTable = chart.getChartDataTable();

//Setting Chart Table Font Color
chartTable.getFont().setColor(com.aspose.cells.Color.getRed());

//Setting Legend Key VisibilityOptions
chartTable.setShowLegendKey(false);

//Saving the Excel file
workbook.save("D:\\book1.xls");