setDriverDataFetcher.java

public DataFetcher setDriverDataFetcher() {
        return dataFetchingEnvironment -> {
            String carId = dataFetchingEnvironment.getArgument("id");
            String firstName = dataFetchingEnvironment.getArgument("firstName");
            String lastName = dataFetchingEnvironment.getArgument("lastName");
            Map<String, String> driverDetails = new HashMap<>();
            driverDetails.put("firstName", firstName);
            driverDetails.put("lastName", lastName);
            driverDetails.put("id", carId);
            drivers.add(driverDetails);
            return driverDetails;
        };
    }