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How to get the Slide number using java via Apache POI API
public final class count {

  public static void main(String args[]) throws Exception {

    File file= new File("C:/Users/THIYAGARAJAN/Desktop/ppt52.ppt");
    FileInputStream is = new FileInputStream(file);
    SlideShow ppt = new SlideShow(is);
    is.close();
    Slide[] slide = ppt.getSlides();
    System.out.println(slide.length);
    for (int i = 0; i < slide.length; i++)  {
      String title = slide[i].getTitle();
      System.out.println("Rendering slide "
                         + slide[i].getSlideNumber()
                         + (title == null ? "" : ": " + title));
    }
  }

}

Exception in thread "main" java.lang.NoSuchFieldError: filesystem
at org.apache.poi.hslf.HSLFSlideShow.getPOIFSFileSystem(HSLFSlideShow.java:79)
at org.apache.poi.hslf.EncryptedSlideShow.checkIfEncrypted(EncryptedSlideShow.java:‌51)
at org.apache.poi.hslf.HSLFSlideShow.<init>(HSLFSlideShow.java:141)
at org.apache.poi.hslf.HSLFSlideShow.<init>(HSLFSlideShow.java:115)
at org.apache.poi.hslf.HSLFSlideShow.<init>(HSLFSlideShow.java:103)
at org.apache.poi.hslf.usermodel.SlideShow.<init>(SlideShow.java:121)
at count.count.main(count.java:22)

ClassLoader classloader =
         org.apache.poi.poifs.filesystem.POIFSFileSystem.class.getClassLoader();
URL res = classloader.getResource(
         "org/apache/poi/poifs/filesystem/POIFSFileSystem.class");
String path = res.getPath();
System.out.println("Core POI came from " + path);

int getSlideCount()