Thank you for your interest in Aspose.Slides.
I have observed your comments and like to share with you that Aspose also offers its APIs to work with .NET environments while using C#, Visual Basic etc. However, in case of Java, you can use NetBeans or Eclipse on your side and you need to add the downloaded jars as explained in the first answer, with a screenshot, over this link . After adding the Jars you can create a Hello World program as explained in this documentation article and then you may proceed as per your requirements. Also, you can find examples for Aspose.Slides for Java over this GitHub link.
I hope this will be helpful. Please share if I may help you further in this regard.