@Nullable
    public static PsiComment addOrReplaceJavadoc(PsiMethod method, String javadoc, boolean replace) {
        final Project project = method.getProject();
        PsiElementFactory factory = JavaPsiFacade.getElementFactory(project);
        PsiComment comment = factory.createCommentFromText(javadoc, null);

        // does a method already exists?
        PsiDocComment doc = method.getDocComment();
        if (doc != null) {
            if (replace) {
                // javadoc already exists, so replace
                doc.replace(comment);
                final CodeStyleManager codeStyleManager = CodeStyleManager.getInstance(project);
                codeStyleManager.reformat(method); // to reformat javadoc
                return comment;
            } else {
                // do not replace existing javadoc
                return null;
            }
        } else {
            // add new javadoc
            method.addBefore(comment, method.getFirstChild());
            final CodeStyleManager codeStyleManager = CodeStyleManager.getInstance(project);
            codeStyleManager.reformat(method); // to reformat javadoc
            return comment;
        }
    }
@Nullable
    public static PsiComment addOrReplaceJavadoc(PsiMethod method, String javadoc, boolean replace)