package AsposeCellsExamples.Data;

import com.aspose.cells.*;
import AsposeCellsExamples.Utils;

public class ListDataValidation {

	public static void main(String[] args) throws Exception {

		// The path to the documents directory.
		String dataDir = Utils.getSharedDataDir(ListDataValidation.class) + "Data/";

		// Create a workbook object.
		Workbook workbook = new Workbook();

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

		// Add a new worksheet and access it.
		int sheetIndex = workbook.getWorksheets().add();
		Worksheet worksheet2 = workbook.getWorksheets().get(sheetIndex);

		// Create a range with name in the second worksheet.
		Range range = worksheet2.getCells().createRange(0, 4, 4, 4);
		range.setName("MyRange");

		// Fill different cells with data in the range.
		range.get(0, 0).setValue("Blue");
		range.get(1, 0).setValue("Red");
		range.get(2, 0).setValue("Green");
		range.get(3, 0).setValue("Yellow");

		// Specify the validation area of cells.
		CellArea area = new CellArea();
		area.StartRow = 0;
		area.StartColumn = 0;
		area.EndRow = 4;
		area.EndColumn = 0;

		// Obtain the existing Validations collection.
		ValidationCollection validations = ExcelWorkSheet.getValidations();

		// Create a validation object adding to the collection list.
		int index = validations.add(area);
		Validation validation = validations.get(index);

		// Set the validation type.
		validation.setType(ValidationType.LIST);

		// Set the in cell drop down.
		validation.setInCellDropDown(true);

		// Set the formula1.
		validation.setFormula1("=MyRange");

		// Enable it to show error.
		validation.setShowError(true);

		// Set the alert type severity level.
		validation.setAlertStyle(ValidationAlertType.STOP);

		// Set the error title.
		validation.setErrorTitle("Error");

		// Set the error message.
		validation.setErrorMessage("Please select a color from the list");

		// Save the excel file.
		workbook.save(dataDir + "LDValidation_out.xls");

		// Print message
		System.out.println("Process completed successfully");

	}
}

package AsposeCellsExamples.Data;

import com.aspose.cells.*;
import AsposeCellsExamples.Utils;

public class ListDataValidation {

	public static void main(String[] args) throws Exception {

		// The path to the documents directory.
		String dataDir = Utils.getSharedDataDir(ListDataValidation.class) + "Data/";

        Workbook workbook = new Workbook();

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

		// Add a new worksheet and access it.
		Worksheet dataSheet = workbook.getWorksheets().add("Data");

		// Create a range with name in the second worksheet.
		Range range = dataSheet.getCells().createRange(0, 4, 4, 1);
		range.setName("MyRange");

		// Fill different cells with data in the range.
		range.get(0, 0).setValue("Blue");
		range.get(1, 0).setValue("Red");
		range.get(2, 0).setValue("Green");
		range.get(3, 0).setValue("Yellow");

		// Specify the validation area of cells.
		CellArea area = new CellArea();
		area.StartRow = 0;
		area.StartColumn = 0;
		area.EndRow = 4;
		area.EndColumn = 0;

		// Obtain the existing Validations collection.
		ValidationCollection validations = validSheet.getValidations();

		// Create a validation object adding to the collection list.
		int index = validations.add(area);
		Validation validation = validations.get(index);

		// Set the validation type.
		validation.setType(ValidationType.LIST);

		// Set the in cell drop down.
		validation.setInCellDropDown(true);

		// Set the formula1.
		validation.setFormula1("=MyRange");

		// Enable it to show error.
		validation.setShowError(true);

		// Set the alert type severity level.
		validation.setAlertStyle(ValidationAlertType.STOP);

		// Set the error title.
		validation.setErrorTitle("Error");

		// Set the error message.
		validation.setErrorMessage("Please select a color from the list");

		// Save the excel file.
		workbook.save(dataDir + "LDValidation_out.xls");

		// Print message
		System.out.println("Process completed successfully");

	}
}

Fix example code of ListDataValidation