Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....//Instantiating a Workbook object Workbook workbook = new Workbook (); //Obtaining...sheet index int sheetIndex = workbook . getWorksheets (). add ();...