Hi Alain, I am using json agoogle map service to retrieve the data. Thanks.

class1:
-----------

public class googleAddress {

    public class Address_components {
        public String long_name;
        public String short_name;
        public List<String> types;
    }

    public class Geometry {
        public Location location;
        public String location_type;
        public Viewport viewport;
    }

    public List<Results> results;
    public String status;
    public Location firstLoc;

    public class Results {
        public List<Address_components> address_components;
        public String formatted_address;
        public Geometry geometry;
        public Boolean partial_match;
        public String place_id;
        public List<String> types;
    }

    public class Viewport {
        public Location northeast;
        public Location southwest;
    }

    public class Location {
        public Double lat;
        public Double lng;
    }

    
    public static googleAddress parse(String json) {
        
        googleAddress returnAddr;
        
        returnAddr = (googleAddress) System.JSON.deserialize(json, googleAddress.class);
        if (!returnAddr.results.isEmpty()){
            returnAddr.firstLoc = returnAddr.results[0].geometry.location;
        }
        return returnAddr; 
        
        
    }
}

class2:
-----------

public class JSONpokus1 {
    
    @future(callout=true)
      public static void parseJSONResponse() {
          Http httpProtocol = new Http();
          HttpRequest request = new HttpRequest();
          String endpoint = 'http://maps.googleapis.com/maps/api/geocode/json?address=Nuselská 23, 140 00, Praha 4';
          request.setEndPoint(endpoint);
          request.setMethod('GET');
          HttpResponse response = httpProtocol.send(request);
          String jsonString = response.getBody();
          System.debug(jsonString);
          googleAddress addr = googleAddress.parse(jsonString);
          
googleAddress.Location loc = addr.firstLoc;
double lng = loc.lng;
double lat = loc.lat;
          
          system.debug(lng);
          system.debug(lat);
      }
    

    

                       
}