How to underline text with a dotted line?

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I need to merge 2 paragraphs, the first is a sequence of dots, and the second is the text that I want write on dots:

Paragraph pdots1 = new Paragraph(
    "..................................................", font10);
Paragraph  pnote= new Paragraph("Some text on the dots", font10);

I tried to play with: pnote.setExtraParagraphSpace(-15); But this messes up the next paragraphs.

Posted on StackOverflow on Mar 13, 2014 by Accollativo

It's not a good idea to use a String with dots when you need a dotted line. It's better to use a dotted line created using the DottedLine class. See for instance the UnderlineWithDottedLine example:

##GITHUB:https://github.com/itext/i7js-examples/blob/develop/src/main/java/com/itextpdf/samples/sandbox/objects/UnderlineWithDottedLine.java##

In this example (see underline_dotted.pdf for the result), I add the line under the baseline of the paragraph (using the setMarginTop() method of LineSeparator with negative value) and I define a lineWidth of 1 point and gap of 2 points between the dots (using the constructor of DottedLine).

Click How to underline text with a dotted line? if you want to see how to answer this question in iText 5.