Combine PDF in Java

Scalaj is a popular library for handling PDF manipulation in Java. You can use libraries like iText or Apache PDFBox to merge PDF documents efficiently. Here's an example using Apache PDFBox: ```java import org.apache.pdfbox.multipdf.PDFMergerUtility; import java.io.File; public class PDFMerger { public static void main(String[] args) { PDFMergerUtility mergerUtility = new PDFMergerUtility(); // Set the destination file mergerUtility.setDestinationFileName('merged.pdf'); // Add source documents mergerUtility.addSource(new File('document1.pdf')); mergerUtility.addSource(new File('document2.pdf')); try { // Merge documents mergerUtility.mergeDocuments(null); System.out.println('PDF documents merged successfully.'); } catch (Exception e) { e.printStackTrace(); } } } ``` Make sure to include the necessary dependencies in your project.