import com.spire.doc.*;
import com.spire.doc.documents.*;

public class CreateMutiColumnWordDocument {
    public static void main(String[] args){
        //create a Document object
        Document document = new Document();
        //add a section 
        Section section = document.addSection();

        //add 3 columns to the section
        section.addColumn(100, 20);
        section.addColumn(100, 20);
        section.addColumn(100, 20);

        //add a paragraph to the section
        Paragraph paragraph = section.addParagraph();
        //add a paragraph to the section
        paragraph = section.addParagraph();
        String text = "Spire.Doc for Java is a professional Java Word API that enables Java applications "
        +"to create, convert, manipulate and print Word documents without using Microsoft Office.";
        //add text to the paragraph
        paragraph.appendText(text);
        //add column break to the paragraph
        paragraph.appendBreak(BreakType.Column_Break);

        //add a paragraph to the section
        paragraph = section.addParagraph();
        //add text to the paragraph
        paragraph.appendText(text);
        //add column break to the paragraph
        paragraph.appendBreak(BreakType.Column_Break);

        //add a paragraph to the section
        paragraph = section.addParagraph();
        //add text to the paragraph
        paragraph.appendText(text);

        //add line between columns
        section.getPageSetup().setColumnsLineBetween(true);

        //save the resultant document
        document.saveToFile("Muti-Column Document.docx", FileFormat.Docx_2013);

    }
}

import com.spire.pdf.*;


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

        String inputPath = "Sample.pdf";

        PdfDocument doc = new PdfDocument();
        doc.loadFromFile(inputPath);
        PdfPageBase page = doc.getPages().get(0);

        float width = (float) page.getSize().getWidth()*2;
        float height = (float) page.getSize().getHeight();

        doc.createBooklet(inputPath, width, height,true);

        doc.saveToFile("Output/Booklet.pdf");

    }
}

import com.spire.pdf.fields.PdfField;
import com.spire.pdf.widget.PdfFormWidget;

public class DetectRequiredFields {

    public static void main(String[] args) {

        //load a PDF file
        PdfDocument doc = new PdfDocument();
        doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\Fields.pdf");

        //get form widget from the PDF document.
        PdfFormWidget formWidget = (PdfFormWidget)doc.getForm();

        //loop through the fields widget
        for (int i = 0; i < formWidget.getFieldsWidget().getList().getCapacity(); i++) {

            //get the specific field
            PdfField field = (PdfField) formWidget.getFieldsWidget().getList().get_Item(i);

            //get the field name
            String fieldName = field.getName();

            //determine if the field is required
            boolean isRequired = field.getRequired();
            if (isRequired){

                //print the required field
                System.out.println(fieldName + " is required");
            }
        }
    }
}