关于Cookies的问题有大神来看看吗？

Question

public class HttpUtil {

private static OkHttpClient singleton;

//非常有必要，要不此类还是可以被new，但是无法避免反射
private HttpUtil() {

}

public static OkHttpClient getInstance() {
    if (singleton == null) {
        synchronized (HttpUtil.class) {
            if (singleton == null) {

                singleton = new OkHttpClient.Builder()
                        .connectTimeout(10, TimeUnit.SECONDS)
                        .readTimeout(20, TimeUnit.SECONDS)
                        .cookieJar(new CookieJar() {
                            private final HashMap<String, List<Cookie>> cookieStore = new HashMap<>();

                            @Override
                            public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
                                cookieStore.put(url.host(), cookies);
                            }

                            @Override
                            public List<Cookie> loadForRequest(HttpUrl url) {
                                List<Cookie> cookies = cookieStore.get(url.host());
                                return cookies != null ? cookies : new ArrayList<Cookie>();
                            }
                        }).build();
            }
        }
    }
    return singleton;
}

}
这样写如果切换用户登录会造成cookies丢失 吗