How do I set the maximum age of a cookie?

package org.kodejava.example.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CookieExpirationExample extends HttpServlet {

    protected void doGet(HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {
    doPost(request, response);
    }

    protected void doPost(HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {
    String username = request.getParameter("username");
    if (username != null) {
        Cookie cookie = new Cookie("username", username);
       
        //
        // Set the cookie age to 600 seconds (10 minutes). Setting the age
        // to 0 will delete the cookie while giving it a negative value will
        // not store the cookie and it will be deleted when the browser is
        // closed.
        //
        cookie.setMaxAge(600);
        response.addCookie(cookie);
    }
    }
}

Source : kodejava.org