Detect Required Fields in a PDF Document in Java

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");
            }
        }
    }
}