/**
 * @param args the command line arguments
 * @throws java.io.IOException
 */
public static void main(String[] args) throws IOException {
    PDDocument document = new PDDocument();
    PDPage page = new PDPage(PDRectangle.A4);

    document.addPage(page);

    PDPageContentStream contentStream = new PDPageContentStream(document, page);

    contentStream.beginText(); 

    contentStream.setFont(PDType1Font.TIMES_ROMAN, 12);
    contentStream.newLineAtOffset(25, 500);
    contentStream.showText("Hello World");

    contentStream.endText();

    contentStream.close();

    document.save("");
    document.close();
}

Creates a new document with a single page and adds text to it.

PDFBox: Add text to page

Java