BE THE CODER > Excel > Java Excel API Examples > How to Add Number Validation to Excel Cells

Java Excel API is an open source java library to read, write and modify Excel spread sheets. This requires the library jxl-2.6.12.jar to be in classpath. The following example shows how to add number validations to Cells in Excel Spread sheet.

File Name :	com/bethecoder/tutorials/jexcelapi/write/NumberValidationTest.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.jexcelapi.write;



import java.io.File;

import java.io.IOException;



import jxl.Workbook;

import jxl.read.biff.BiffException;

import jxl.write.Blank;

import jxl.write.WritableCellFeatures;

import jxl.write.WritableSheet;

import jxl.write.WritableWorkbook;

import jxl.write.WriteException;



public class NumberValidationTest {



  /**

   * @param args

   * @throws IOException 

   * @throws IOException 

   * @throws WriteException 

   * @throws BiffException 

   */

  public static void main(String[] args) throws IOException, WriteException {

    //Creates a writable workbook with the given file name

    WritableWorkbook workbook = Workbook.createWorkbook(new File("C:/JXL/Num-validations.xls"));

    

    WritableSheet sheet = workbook.createSheet("My Sheet", 0);

    

    //Add a Blank cell with number validation

    Blank blankCell = new Blank(0, 0);

    

    //Throws an error when entered number is less or equal to 101.5

    WritableCellFeatures cellFeatures = new WritableCellFeatures();

    cellFeatures.setNumberValidation(101.5, WritableCellFeatures.GREATER_THAN);

    blankCell.setCellFeatures(cellFeatures);

    sheet.addCell(blankCell);

    

    blankCell = new Blank(1, 0);

    //Throws an error when entered number is greater or equal to 101.5

    cellFeatures = new WritableCellFeatures();

    cellFeatures.setNumberValidation(101.5, WritableCellFeatures.LESS_THAN);

    blankCell.setCellFeatures(cellFeatures);

    sheet.addCell(blankCell);

    

    //Writes out the data held in this workbook in Excel format

    workbook.write(); 

    

    //Close and free allocated memory 

    workbook.close(); 

  }



}