StyledDocument doc = new StyledDocument3();
SimpleAttributeSet atts = new SimpleAttributeSet();
try
{
atts.addAttribute(StyleConstants.StrikeThrough, Boolean.TRUE);
doc.insertString(0, "bbbbb", atts);
doc.insertString(5, "aaaaa", null);
doc.insertString(5, "N", atts);
atts.addAttribute(StyleConstants.Bold, Boolean.TRUE);
doc.insertString(6, "M", atts);
}