Set custom properties for PDF files in Java

import com.spire.pdf.*;

public class PDFCustomProperties {
    public static void main(String[] args) throws Exception {

        String inputPath = "Sample.pdf";
        PdfDocument doc = new PdfDocument(inputPath);
        doc.loadFromFile(inputPath);

        //Set the custom properties
        doc.getDocumentInformation().setCustomerDefined("Number", "123");
        doc.getDocumentInformation().setCustomerDefined("Name", "Daisy");
        doc.getDocumentInformation().setCustomerDefined("Company", "e-iceblue");
       
        //Save the document to file
        doc.saveToFile("Output/result.pdf");
        doc.close();

    }
}