Free response #2

Bikes.txt

Imagine we're a bike shop. We sell bikes. Bikes have a manufacturer,
a model name, and a price. So we will represent bikes with the 
following class:

public class Bike
{
	private int price;
	private String modelName;
	private String manufacturer;

	/* Returns the model name of this bike. */
	public String getModelName() {
		/* Implementation not shown. */
	}

	/* Returns the manufacturer of this bike. */
	public String getManufacturer() {
		/* Implementation not shown. */
	}

	/* Returns the price of this bike to the closest dollar. */
	public int getPrice() {
		/* Implementation not shown. */
	}
}

So...we're a bike shop. Which means we have a large "inventory" of
bikes, which can be represented by an ArrayList. We should be able to
"sell" a bike (which means we will remove it from the ArrayList) and
earn some revenue. Furthermore, we should be able to "search" for 
bikes - for example if a customer asks us if we have a particular bike 
in stock. I want you to implement the "sell" and "search" methods in 
the following bike shop class.

public class BikeShop
{
	/* A list of all the bikes in our inventory. */
	List<Bike> bikes;
	private int revenue;

	/* Constructor and some other methods not shown. */

	/* Returns a Bike object that has the given manufacturer
	 * and the given modelName, if we have one in our inventory.
	 * If we have more than one bike that matches the given
	 * specifications, just return the first one that you find.
	 * Otherwise, returns null. 
	 *
	 * The list of bikes is NOT sorted so you can just do a
	 * linear search.  
	 */
	public Bike searchForBike(String manufacturer, String modelName) {
		// TODO
	}

	/* Sells ALL the bikes with the given manufacturer and model name, 
	 * and increases the stores revenue (by which I mean remove the 
	 * bikes from our inventory and add the prices of the sold bikes 
	 * to the revenue variable). Just to clarify, yes, I'm asking you
	 * to sell ALL the bikes that match, not just a single one.
	 *
	 * Precondition: the bike exists in our inventory. So you're 
	 *               guaranteed that you can find at least one such 
	 *				 bike in our inventory.
	 * Post condition: (1) the revenue variable is updated to reflect
	 *                 the shop's new total revenue after selling 
	 *                 the bikes.
	 *                 (2) no bikes with the given manufacturer and
	 *                 model name exist anymore in our inventory.
	 * */
	public void sellBikes(String manufacturer, String modelName) {
		// TODO
	}
}