String dataDir = Utils.getSharedDataDir(CreateNumberedList.class) + "text/";

// create an object of the Document class
Document doc = new Document();

// initialize Page class object
Page page = new Page(doc);

// initialize Outline class object
Outline outline = new Outline(doc);

// initialize TextStyle class object and set formatting properties
ParagraphStyle defaultStyle = new ParagraphStyle();
defaultStyle.setFontColor(Color.black);
defaultStyle.setFontName("Arial");
defaultStyle.setFontSize(10);

// initialize OutlineElement class objects and apply numbering
// numbers in the same outline are automatically incremented.
OutlineElement outlineElem1 = new OutlineElement(doc);

outlineElem1.setNumberList(new NumberList("{0})", NumberFormat.DecimalNumbers, "Arial", 10));

RichText text1 = new RichText(doc);
text1.setText("First");
text1.setParagraphStyle(defaultStyle);
outlineElem1.appendChildLast(text1);

OutlineElement outlineElem2 = new OutlineElement(doc);
outlineElem2.setNumberList(new NumberList("{0})", NumberFormat.DecimalNumbers, "Arial", 10));
RichText text2 = new RichText(doc);
text2.setText("Second");
text2.setParagraphStyle(defaultStyle);
outlineElem2.appendChildLast(text2);

OutlineElement outlineElem3 = new OutlineElement(doc);
outlineElem3.setNumberList(new NumberList("{0})", NumberFormat.DecimalNumbers, "Arial", 10));
RichText text3 = new RichText(doc);
text3.setText("Third");
text3.setParagraphStyle(defaultStyle);
outlineElem3.appendChildLast(text3);

// add outline elements
outline.appendChildLast(outlineElem1);
outline.appendChildLast(outlineElem2);
outline.appendChildLast(outlineElem3);

// add Outline node
page.appendChildLast(outline);

// add Page node
doc.appendChildLast(page);

// save the document
doc.save(dataDir + "CreateNumberedList_out.pdf");