This article demonstrates how to add various types of lists to PDF using the PdfListApi interface provided by Spire.Cloud.PDF.

import spire.cloud.pdf.sdk.ApiException;
import spire.cloud.pdf.sdk.Configuration;
import spire.cloud.pdf.sdk.api.PdfListApi;
import spire.cloud.pdf.sdk.model.Font;
import spire.cloud.pdf.sdk.model.List;
import java.util.ArrayList;

public class AddList {
    static String appId = "APP ID";
    static String appKey = "APP Key";
    static String baseUrl= "https://api.cloudxdocs.com";
    //Create a Configuration instance based on your AppID and AppKey
    static Configuration configuration = new Configuration(appId, appKey, baseUrl);
    //Create a PdfListApi instance
    static PdfListApi pdfListApi = new PdfListApi(configuration);

    public static void main(String[]args) throws ApiException {
        //Specify the input PDF document
        String name = "AddList.pdf";
        //Specify the file path of the output document
        String outPath = "/PdfList/AddList.pdf";
        //Specify the number of the page that you want to add lists to
        int pageNumber = 1;
        //Specify the password used to open the document, and it's "null" if nothing
        String password = null;
        //Specify the folder storing the input document, and it's "null" if nothing
        String folder = "input";
        //Use the 2G storage provided by E-iceblue, and it's "null" by default
        String storage = null;

        //Create an ArrayList of list type to add the lists created below
        ArrayList<List> lists = new  ArrayList<List>();

        //Create a Font
        Font font = new Font();
        font.setFontType(Font.FontTypeEnum.STANDARD);
        font.setFontFamily("Helvetica");
        font.setFontSize(12f);
        font.setFontStyle(Font.FontStyleEnum.BOLD);

        //Create an ArrayList of String type for the text value of lists created below
        ArrayList<String> strList1 = new ArrayList<String>();
        strList1.add("123");
        strList1.add("456");
        strList1.add("789");
        strList1.add("000");

        //Create a sorted list with UPPERROMAN number style
        spire.cloud.pdf.sdk.model.List list1 = new  spire.cloud.pdf.sdk.model.List();
        list1.setX(50f);
        list1.setY(50f);
        list1.setWidth(null);
        list1.setHeight(null);
        list1.setType(List.TypeEnum.SORTED);
        list1.setText(strList1);
        list1.setIndent(0f);
        list1.setTextIndent(0f);
        list1.setFont(font);
        list1.setNumberStyle(List.NumberStyleEnum.UPPERROMAN);
        list1.setStartNumber(null);

        //Create a sorted list with UPPERLATIN number style
        spire.cloud.pdf.sdk.model.List list2 = new  spire.cloud.pdf.sdk.model.List();
        list2.setX(50f);
        list2.setY(200f);
        list2.setWidth(100f);
        list2.setHeight(100f);
        list2.setType(List.TypeEnum.SORTED);
        list2.setText(strList1);
        list2.setIndent(5f);
        list2.setTextIndent(5f);
        list2.setFont(font);
        list2.setNumberStyle(List.NumberStyleEnum.UPPERLATIN);
        list2.setStartNumber(3);

        //Create a sorted list with LOWERROMAN number style
        spire.cloud.pdf.sdk.model.List list3 = new  spire.cloud.pdf.sdk.model.List();
        list3.setX(50f);
        list3.setY(300f);
        list3.setWidth(100f);
        list3.setHeight(100f);
        list3.setType(List.TypeEnum.SORTED);
        list3.setText(strList1);
        list3.setIndent(5f);
        list3.setTextIndent(5f);
        list3.setFont(font);
        list3.setNumberStyle(List.NumberStyleEnum.LOWERROMAN);
        list3.setStartNumber(3);

        //Create a sorted list with NUMERIC number style
        spire.cloud.pdf.sdk.model.List list4 = new  spire.cloud.pdf.sdk.model.List();
        list4.setX(50f);
        list4.setY(400f);
        list4.setWidth(100f);
        list4.setHeight(100f);
        list4.setType(List.TypeEnum.SORTED);
        list4.setText(strList1);
        list4.setIndent(5f);
        list4.setTextIndent(5f);
        list4.setFont(font);
        list4.setNumberStyle(List.NumberStyleEnum.NUMERIC);
        list4.setStartNumber(3);

        //Create a sorted list with no number style
        spire.cloud.pdf.sdk.model.List list5 = new  spire.cloud.pdf.sdk.model.List();
        list5.setX(50f);
        list5.setY(520f);
        list5.setWidth(100f);
        list5.setHeight(100f);
        list5.setType(List.TypeEnum.SORTED);
        list5.setText(strList1);
        list5.setIndent(5f);
        list5.setTextIndent(5f);
        list5.setFont(font);
        list5.setNumberStyle(List.NumberStyleEnum.NONE);
        list5.setStartNumber(3);

        //Create an ArrayList of String type for the text value of lists created below
        ArrayList<String> strList2 = new ArrayList<String>();
        strList2.add("147");
        strList2.add("258");
        strList2.add("369");
        strList2.add("000");

        //Create an unsorted list with no number style
        spire.cloud.pdf.sdk.model.List list6 = new  spire.cloud.pdf.sdk.model.List();
        list6.setX(350f);
        list6.setY(50f);
        list6.setWidth(null);
        list6.setHeight(null);
        list6.setType(List.TypeEnum.UNSORTED);
        list6.setText(strList2);
        list6.setIndent(0f);
        list6.setTextIndent(0f);
        list6.setFont(font);
        list6.setNumberStyle(null);
        list6.setStartNumber(null);

        //Create an unsorted list with  LOWERLATIN number style
        spire.cloud.pdf.sdk.model.List list7 = new  spire.cloud.pdf.sdk.model.List();
        list7.setX(350f);
        list7.setY(200f);
        list7.setWidth(100f);
        list7.setHeight(100f);
        list7.setType(List.TypeEnum.UNSORTED);
        list7.setText(strList2);
        list7.setIndent(5f);
        list7.setTextIndent(5f);
        list7.setFont(font);
        list7.setNumberStyle(List.NumberStyleEnum.LOWERLATIN);
        list7.setStartNumber(3);

        //Add the lists to the ArrayList
        lists.add(list1);
        lists.add(list2);
        lists.add(list3);
        lists.add(list4);
        lists.add(list5);
        lists.add(list6);
        lists.add(list7);

        //Call addList method to add the ArrayList to PDF and save to a speicified path
        pdfListApi.addList(name, outPath, pageNumber, lists, folder, storage, password);
    }
}

Output: