This article guides on how to merge Excel files using Java. It has details to set the IDE, a list of steps, and a sample code to combine Excel files using Java. You will also learn about filtering sheets in an Excel file before merging them into a destination file.

Steps to Combine Multiple Excel Files using Java

1. Set the IDE to use Aspose.Cells for Java to join Excel files
2. Load the Aspose.Cells license to avoid a watermark in the resultant merged Excel file
3. Create a list of Excel files to merge
4. If the list is empty, display an appropriate message and exit
5. Load the first Excel file as the destination file into the Workbook class object
6. Loop through the rest of the Excel files in the list and merge each into the destination file using the Combine method
7. Save the merged Excel file on the local disk

These steps define the process to join Excel files using Java. Commence the process by importing necessary classes and modules, loading the license, creating a list of Excel files manually or fetching file names from a directory, and loading the first Excel file as the destination file. Finally, loop through the remaining files and merge each of them into the destination file.

Code to Combine Excel Documents using Java

The aforementioned code demonstrates how to merge XLSX files using Java. You may process each Excel file before loading by filtering the sheets based on their index, sheet name, or changing the order of sheets using the LoadFilter property in the LoadOptions. You can also merge files sheet-by-sheet instead of the whole workbook.

This article has taught us the process to merge Excel files. To create a Gantt chart, refer to the article Create Gantt Chart in Excel using Java.