// Returns price of cars at this location
public int queryCarsPrice(int id, String location) throws RemoteException {
return queryPrice(id, Car.getKey(location));
}
// Adds car reservation to this customer.
public boolean reserveCar(int id, int customerID, String location) throws RemoteException {
return reserveItem(id, customerID, Car.getKey(location), location);
}
// Delete cars from a location
public boolean deleteCars(int id, String location) throws RemoteException {
return deleteItem(id, Car.getKey(location));
}