Java set the viewer preference and zoom factor for PDF

import com.spire.pdf.*;
import com.spire.pdf.actions.*;
import com.spire.pdf.general.*;

import java.awt.geom.*;

public class setZoomFactor {
    public static void main(String[] args) {

        //Load the sample document
        PdfDocument doc = new PdfDocument();
        doc.loadFromFile("Sample.pdf");

        //Get the first page of PDF
        PdfPageBase page = doc.getPages().get(0);

        //Set pdf destination
        PdfDestination dest = new PdfDestination(page);
        dest.setMode(PdfDestinationMode.Location);
        dest.setLocation(new Point2D.Float(-40f, -40f));

        //Set zoom factor
        dest.setZoom(0.8f);

        //Set action
        PdfGoToAction gotoAction = new PdfGoToAction(dest);
        doc.setAfterOpenAction(gotoAction);

        //Save pdf document
        String output = "output/setZoomFactor.pdf";
        doc.saveToFile(output);
    }
}

import com.spire.pdf.*;

public class viewerPreference {
    public static void main(String[] args) {

        //Load the sample document
        PdfDocument doc = new PdfDocument();
        doc.loadFromFile("Sample.pdf");

        //Set viewer reference
        doc.getViewerPreferences().setCenterWindow(true);
        doc.getViewerPreferences().setDisplayTitle(false);
        doc.getViewerPreferences().setFitWindow(false);
        doc.getViewerPreferences().setHideMenubar(true);
        doc.getViewerPreferences().setHideToolbar(true);
        doc.getViewerPreferences().setPageLayout(PdfPageLayout.Two_Column_Left);

        //Save pdf document
        String output = "output/viewerPreference.pdf";
        doc.saveToFile(output);
    }
}