Generally, we use MS-PowerPoint to create presentations. Now let us see how to create presentations using Java. After completion of this chapter, you will be able to create new MS-PowerPoint presentations and open existing PPTs with your Java program.

Creating Empty Presentation

To create an empty presentation, you have to instantiate the XMLSlideShow class of the org.poi.xslf.usermodel package



Save the changes to a PPT document using the FileOutputStream class



Given below is the complete program to create a blank MS-PowerPoint presentation.



Save the above Java code as CreatePresentation.java, and then compile and execute it from the command prompt as follows



If your system environment is configured with the POI library, it will compile and execute to generate a blank PPT file named example1.pptx in your current directory and display the following output on the command prompt



The blank PowerPoint document appears as follows

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Editing an Existing Presentation

To open an existing presentation, instantiate the XMLSlideShow class and pass the FileInputStream object of the file to be edited, as an argument to the XMLSlideShow constructor.



You can add slides to a presentation using the createSlide() method of the XMLSlideShow class which is in the org.poi.xslf.usermodel package.



Given below is the complete program to open and add slides to an existing PPT



Save the above Java code as EditPresentation.java, and then compile and execute it from the command prompt as follows



It will compile and execute to generate the following output



The output PPT document with newly added slides looks as follows

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After adding slides to a PPT, you can add, perform, read, and write operations on the slides.