// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java
// The path to the documents directory.
String dataDir = Utils.getDataDir(GetWorksheetOfChart.class);
// Create workbook object from source Excel file
Workbook workbook = new Workbook(dataDir + "source.xlsx");

// Access the first worksheet
Worksheet worksheet = workbook.getWorksheets().get(0);

// Access the first chart inside the worksheet
Chart chart = worksheet.getCharts().get(0);

// Calculate the Chart first to get the Equation Text of Trendline
chart.calculate();

// Access the Trendline
Trendline trendLine = chart.getNSeries().get(0).getTrendLines().get(0);

// Read the Equation Text of Trendline
System.out.println("Equation Text: " + trendLine.getDataLabels().getText());