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FileWriterfstream=newFileWriter("");BufferedWriterout=newBufferedWriter(fstream);for(Byteb:bArray){(b);();Followthesestepstomergemultiple PDFdocuments:FirstwehavetoinstantiatethePDFMergerUtilityclass.mergetwopdfbytearraysjava:PDFBoxMergingMultiplePDF DocumentsTutorialspointmergemultiplepdffilesintooneusingjava:ApachePDFBoxMergeMultiplePDFDocumentsinJavamergemultiplepdffilesintoone usingjava:Flatten&MergePDFsintowithJava–KnowledgeBaseWecancombinetwoormorebytearraysusingtheabovemethod:byte[]combined=(first, second,third);assertArrayEquals(expectedArray,combined);Aswecansee,theresultantcombinedarraycontainselementsfromallthearrayspassedtothe concat()methodUsingiText(existingPDFinbytes)publicstaticbyte[]mergePDF(Listbyte[]>pdfFilesAsByteArray)throwsDocumentException,IOException{ ByteArrayOutputStreamoutStream=newByteArrayOutputStream();Documentdocument=null;PdfCopywriter=null;for(byte[]pdfByteArray: pdfFilesAsByteArray){try{PdfReaderreader=newPdfReaderIneedtotakethebytearrayandcreateaPDFoutofit.Ifyouaremergingtwobytearrays whichcontainPDF,thislogicwillnotwork.hereistruggledtogetthebyte[].javamergepdfbytearray:iTextMergePDFExampleExamplesJavaCode Geeksmergemultiplepdffilesintooneusingjava:Mergetwoarrayofbytesinonepdfmergetwopdfbytearraysjava:PDFBoxMergingMultiplePDF DocumentsTutorialspointmergemultiplepdffilesintooneusingjava:ApachePDFBoxMergeMergingtwoPDF'sasbytearraysPlanetPDFThisisthecodeI'm usingtomergetwobytearrays,eachrepresentingasinglepdf:importMergingtwoPDF'sasbytearraysPlanetPDFpdfreaderThisisthecodeI'musingtomerge twobytearrays,eachrepresentingasinglepdf:importjavamergepdfbytearray:MergeMultiplePDFDocumentsusingiTextandJavajavapdfmerge:Howto mergetwoPDFfilesintooneinJava?StackOverflowjavamergepdfbytearray:iTextHowtomergePDFsfromByteArrayOutputStreams?pleaseletmeknow howtogetthebyte[].ThisiswhatIhave:try{.//Createfile.NowwehavetosetthesourcefilesusingtheaddSource()methodSecondwehavetosetthe destinationfileusingthesetDestinationFileName()methodWeneedtouseathird-partytoollikePDFboxfromApachemergetwopdfbytearraysjava:Java: MergingmultiplePDFsintoasinglePDFusingiTexthowtomergetwopdffilesusingjava:howtocombinetwodifferentPDF'sandreturnonlybyte[](Openhow tomergetwopdffilesusingjava:HowtomergetwoPDFfilesintooneinJava?StackOverflowjavamergepdfbytearray:JavaExamplesjavamergepdfbyte array:iTextMergePDFExampleExamplesJavaCodeGeeksmergemultiplepdffilesintooneusingjava:MergetwoarrayofbytesinonepdffileCodeProject howtomergetwopdffilesusingjava:Howtomergetwopdffilesusingitextinjava?thisbytearrayneedtoopeninapdffileasshownabovejavamergepdfbyte array:JavaExamplesMergeTwoPDFsTutorialspointmergetwopdfbytearraysjava:EasywaytoconcatenatetwobytearraysStackOverflowmergemultiple pdffilesintooneusingjava:Java:MergingmultiplePDFsintoaMergetwoPDFbytearrays.javamergepdfbytearray:HowtomergetwoPDFfilesintoonein Java?Stackicombinedtwopdf'sintoonepdfusingnewPdfCopyFields()addDocument(reader1);newPdfCopyFields()addDocument(reader2);aftterthatiwant togetbyte[]fromPdfCopyFields()