Android : Java syntax to obtain reviews and photos of Google places Android

I am developing an Android app related to nearby places. I need a place's photos and reviews, but I don't know the syntax to write it in Java language. I know how to obtain the URL for which the syntax is:

JSONObject jPlace;
URL = jPlace.getString("url");

But I don't know how to get the open, day, time, open_now, photo_reference fields as seen in https://developers.google.com/places/documentation/details

I just need the syntax for those fields as I have shown above.