Thanks for considering Aspose.
If you have downloaded the Aspose.Cells.zip, unzip it to your system. Now get Aspose.Cells.jar and dom4j-1.6.1.jar from "..\JDK 5.0\lib\" to your specified directory and set the class path to add reference to those two files. Now you can create Java applications that can use the component.
public static void main(String args)
//Instantiate a Workbook object that represents Excel file.
Workbook wb = new Workbook();
//Note when you create a new workbook, a default worksheet
//"Sheet1" is added (by default) to the workbook.
//Access the first worksheet "Sheet1" in the book.
Worksheet sheet = wb.getWorksheets().getSheet(0);
//Access the "A1" cell in the sheet.
Cell cell = sheet.getCells().getCell("A1");
//Input the "Hello World!" text into the "A1" cell
//Save the Excel file.
For further reference about Aspose.Cells for Java documentation Programmer's guide and API reference, kindly check the following (Kindly check different sections and explore their topics and subtopics to know how to implement / use different features for your applications) :