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Layers Group Demo

import java.io.FileOutputStream; import com.lowagie.text.Document; import com.lowagie.text.pdf.PdfArray; import com.lowagie.text.pdf.PdfDictionary; import com.lowagie.text.pdf.PdfLayer; import com.lowagie.text.pdf.PdfLayerMembership; import com.lowagie.text.pdf.PdfName; import com.lowagie.text.pdf.PdfOCProperties; import com.lowagie.text.pdf.PdfObject; import com.lowagie.text.pdf.PdfString; import com.lowagie.text.pdf.PdfWriter; public class LayersGroupPDF {   public static void main(String[] args) {     Document document = new Document();     try {       PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("LayersGroupPDF.pdf"));       writer.setPdfVersion(PdfWriter.VERSION_1_5);       writer.setViewerPreferences(PdfWriter.PageModeUseOC);       document.open();       PdfLayer l1 = new PdfLayer("Layer 1", writer);       PdfLayer l2 = new PdfLayer("Layer 2", writer);       PdfLayer l3 = new PdfLayer("Layer 3", writer);       PdfLayerMembership m1 = new PdfLayerMembership(writer);       m1.addMember(l1);       m1.addMember(l2);       m1.addMember(l3);            PdfOCProperties p = writer.getOCProperties();       PdfArray order = new PdfArray();       order.add(l1.getRef());       PdfArray group = new PdfArray();       group.add(new PdfString("A group of two", PdfObject.TEXT_UNICODE));       group.add(l2.getRef());       group.add(l3.getRef());       order.add(group);       PdfDictionary d = new PdfDictionary();       d.put(PdfName.ORDER, order);       p.put(PdfName.D, d);     } catch (Exception e) {       System.err.println(e.getMessage());     }     document.close();   } }                     itext.zip( 1,748 k)