Review

class PdfAnnotation {
    /**
     * Adds a circle or a square that shows a tooltip when you pass over it.
     * @param writer
     * @param rect
     * @param contents The tooltip
     * @param square true if you want a square, false if you want a circle
     * @return A PdfAnnotation
     */
    public static PdfAnnotation createSquareCircle(PdfWriter writer, Rectangle rect, String contents, boolean square) {
        PdfAnnotation annot = new PdfAnnotation(writer, rect);
        if (square)
            annot.put(PdfName.SUBTYPE, PdfName.SQUARE);
        else
            annot.put(PdfName.SUBTYPE, PdfName.CIRCLE);
        annot.put(PdfName.CONTENTS, new PdfString(contents, PdfObject.TEXT_UNICODE));
        return annot;
    }

}