Java IText: Superscript + Subscript
You can write text as superscript or subscript using the 
Chunk class, and it's setTextRise()method. You use a positive text rise value for superscript, and a negative text rise value for subscript.
Here is a simple code example:
import com.itextpdf.text.Chunk;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfWriter;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
public class SuperSubScriptExample {
  public static void main(String[] args) {
    Document document = new Document();
    try {
      PdfWriter.getInstance(document,
            new FileOutputStream("SuperSubScript.pdf"));
      document.open();
      Chunk normalText =
            new Chunk("Normal text at normal y-location. ");
      document.add(normalText);
      Chunk superScript = new Chunk("Superscript");
      superScript.setTextRise(5f);
      document.add(superScript);
      Chunk moreNormalText =
            new Chunk(". More normal y-location text. ");
      document.add(moreNormalText);
      Chunk subScript = new Chunk("Subscript");
      subScript.setTextRise(-5f);
      document.add(subScript);
      document.close();
    } catch (DocumentException e) {
      e.printStackTrace();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
  }
}
Here is what the generated document looks like:
![]()  | 
| IText Chunk's with superscript and subscript | 


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