operator != cannot be applied to double, null

Question

I am getting an error on this code below:

  HashMap map = new HashMap();
  map.put("driver", userId);
  map.put("customer", customerId);
  map.put("rating", 0);
  map.put("timestamp", getCurrentTimestamp());
  map.put("destination", destination);
  map.put("location/from/lat", pickupLatLng.latitude);
  map.put("location/from/lng", pickupLatLng.longitude);
  map.put("location/to/lat", destinationLatLng.latitude);
  map.put("location/to/lng", destinationLatLng.longitude);
  map.put("distance", rideDistance);
  historyRef.child(requestId).updateChildren(map);

They said to add:

do if( pickupLatLng.latitude != null && pickupLatLng.longitude != null && destinationLatLng.latitude != null && destinationLatLng.longitude != null) before creating the hashMap, or for each latitude and longitude.

But when i try this i am getting the following error: operator != cannot be applied to double, null

Can someone help me please ?

Answer 1

double is a primitive type, it cannot be null, instead you can use Double and then compare it to null