Response to ACM TIP application question

Dealership.java

import java.util.ArrayList;
import java.util.List;

class Car{
    public Car(){}
}
public class Dealership {
    List<Car> inventory;
    public Dealership(){
        inventory = new ArrayList<Car>();
    }
    public void buyCar(Car car){
        inventory.add(car);
    }
    public void sellCar(Car car){
        inventory.remove(car);
    }
}