问如何添加？它扩展了List中的某个类

EN

@Autowired
DBConnection connection;

public class DefinedAddress {

    public String getAddress() {

        List<? extends Address> addressList =connection.getAddresss("SELECT address FROM Address WHERE Id = 1;")

        return  addressList.get(0).location);
    }
}

public class DefinedAddressTest {

    public static void main(String[] args) {
        // Create a list 
        List<? extends Address> addressList = new ArrayList<>();
        City city = new City();
        city.setLocation("CurrentLocation");
        addressList.add(city);//Compile time issue 
        //mock Defined Addrss getAddress() method to fetch the address
        Mockit.when(connection.getAddresss("Query").return(addressList );
    }
}