Hi,
Thanks for your posting and using Aspose.Cells.
We have tested your code with the latest version and it works fine. Please download and try the latest version:
Aspose.Cells for Java v8.7.2.2 and let us know your feedback.
Here is the console output of your code with the latest version.
Console Output:
8.7.2.2
Check Box 2
Button 3