public class Driver
{
    private String name; // For debugging purposes

    private Car car;

    public Driver(String aName)
    {
        name = aName;
    }

    public Car getCar()
    {
        return car;
    }

    public String getName()
    {
        return name;
    }

    public void setCar(Car aCar)
    {
        Car oldCar = car;

        car = aCar;
        if (oldCar != null && oldCar.getDriver() == this)
        {
            oldCar.setDriver(null);
        }

        if (aCar != null && aCar.getDriver() != this)
        {
            aCar.setDriver(this);
        }
    }

    // For debugging purposes
    public void print()
    {
        System.out.print("Driver's name is " + name);
        if (car == null)
        {
            System.out.println(" and has no car");
        }
        else
        {
            System.out.println(" and has car " + car.getName());
        }
    }
}