Merge PDF documents - Apache PDFBox example

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import java.io.File; import java.io.IOException; import java.util.Random;   import org.apache.pdfbox.io.MemoryUsageSetting; import org.apache.pdfbox.multipdf.PDFMergerUtility; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDPage; import org.apache.pdfbox.pdmodel.PDPageContentStream; import org.apache.pdfbox.pdmodel.common.PDRectangle; import org.apache.pdfbox.pdmodel.font.PDType1Font;     public class MergePDFs {       public static void main(String[] args) {           try {               //Creating PDF document object             String myPDF1 = "docs/my_doc1.pdf";             PDDocument document1 = new PDDocument();               //Add Random number of Pages in your document             Random generator = new Random();             int myCount = generator.nextInt(10) + 1;             for(int i=0; i < myCount; i++){                 PDPage page = new PDPage(PDRectangle.LETTER);                 document1.addPage(page);                 addText(document1,page,i+1);             }                 document1.save(myPDF1);             document1.close();               //Creating PDF document object             String myPDF2 = "docs/my_doc2.pdf";             PDDocument document2 = new PDDocument();               //Add Random number of Pages in your document             int newCount = generator.nextInt(10) + myCount + 1;             for(int i=myCount; i < newCount; i++){                 PDPage page = new PDPage(PDRectangle.LETTER);                 document2.addPage(page);                 addText(document2,page,i+1);             }               document2.save(myPDF2);             document2.close();               //Now let's merge the 2 documents             //instantiate the merge utility class             File file1 = new File(myPDF1);             File file2 = new File(myPDF2);             PDFMergerUtility pdfMerger = new PDFMergerUtility();             pdfMerger.setDestinationFileName("docs/merged.pdf");             pdfMerger.addSource(file1);             pdfMerger.addSource(file2);             pdfMerger.mergeDocuments(MemoryUsageSetting.setupMainMemoryOnly());             file1.delete();             file2.delete();             } catch (IOException e) {             e.printStackTrace();         }       }       private static void addText(PDDocument document, PDPage page, int pageNo) {           try {               PDPageContentStream contentStream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true);             contentStream.beginText();             contentStream.setFont(PDType1Font.HELVETICA, 12);             contentStream.newLineAtOffset(25,750);             contentStream.showText("This is Page No: " + pageNo);                  contentStream.endText();             contentStream.close();           } catch (IOException e) {             e.printStackTrace();         }       }     }