Java web servlet

@WebServlet(value = "/calculate")
public class CalculatorServlet extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
        int a = Integer.parseInt(req.getParameter("a"));
        int b = Integer.parseInt(req.getParameter("b"));

        Calculator calculator = new Calculator();
        int result = calculator.add(a, b);

        resp.getWriter().println("Result: " + result);
    }
}