Group Shapes in PowerPoint in Java

import com.spire.presentation.*;
import com.spire.presentation.drawing.FillFormatType;

import java.awt.geom.Rectangle2D;
import java.util.ArrayList;

public class GroupShapes {
    public static void main(String[] args) throws Exception {
        //create a PowerPoint document
        Presentation ppt = new Presentation();
        //get the first slide
        ISlide slide = ppt.getSlides().get(0);

        //add a rectangle shape to the slide
        IShape rectangle = slide.getShapes().appendShape(ShapeType.RECTANGLE, new Rectangle2D.Double(20,100,200,40));
        rectangle.getFill().setFillType(FillFormatType.SOLID);
        rectangle.getFill().getSolidColor().setKnownColor(KnownColors.GOLD);
        rectangle.getLine().setWidth(0.1f);

        //add a ribbon shape to the slide
        IShape ribbon = slide.getShapes().appendShape(ShapeType.RIBBON_2, new Rectangle2D.Double(60, 75, 120, 80));
        ribbon.getFill().setFillType(FillFormatType.SOLID);
        ribbon.getFill().getSolidColor().setKnownColor(KnownColors.PURPLE);
        ribbon.getLine().setWidth(0.1f);

        //add the shapes to a list
        ArrayList list = new ArrayList();
        list.add((Shape)rectangle);
        list.add((Shape)ribbon);

        //group the shapes
        ppt.getSlides().get(0).groupShapes(list);

        //save the resultant document
        ppt.saveToFile("GroupShapes.pptx", FileFormat.PPTX_2013);
    }
}