Aspose.Slides for Java
· Aspose.Slides for Java is a unique PowerPoint document processing API that enables Java applications to read, write and manipulate PowerPoint documents (PPT, PPTX, POS, PPS, POTX, PPSX) PDF, HTML and image file formats without using Microsoft PowerPoint
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window aspose-slides-23.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.