7.4.6. Free Response - CookieOrder B

The following is a free response question from 2010. It was question 1 on the exam. You can see all the free response questions from past exams at https://apstudents.collegeboard.org/courses/ap-computer-science-a/free-response-questions-by-year.

Question 1. An organization raises money by selling boxes of cookies. A cookie order specifies the variety of cookie and the number of boxes ordered. The declaration of the CookieOrder class is shown below.

public class CookieOrder
 /** Constructs a new CookieOrder object */
 public CookieOrder(String variety, int numBoxes)
 { /* implementation not shown */ }

 /** @return the variety of cookie being ordered
 public String getVariety()
 { /* implementation not shown */ }

 /** @return the number of boxes being ordered
 public int getNumBoxes()
 { /* implementation not shown */ }

 // There may be instance variables, constructors, and methods that are not shown.

The MasterOrder class maintains a list of the cookies to be purchased. The declaration of the MasterOrder class is shown below.

public class MasterOrder
 /** The list of all cookie orders */
 private List<CookieOrder> orders;

 /** Constructs a new MasterOrder object */
 public MasterOrder()
 { orders = new ArrayList<CookieOrder>(); }

 /** Adds theOrder to the master order.
 *   @param theOrder the cookie order to add to the master order
 public void addOrder(CookieOrder theOrder)
 { orders.add(theOrder); }

 /** @return the sum of the number of boxes of all of the cookie orders
 public int getTotalBoxes()
 { /* to be implemented in part (a) */ }

 // There may be instance variables, constructors, and methods that are not shown.

Part b. The removeVariety method updates the master order by removing all of the cookie orders in which the variety of cookie matches the parameter cookieVar. The master order may contain zero or more cookie orders with the same variety as cookieVar. The method returns the total number of boxes removed from the master order.

For example, consider the following code segment.

MasterOrder goodies = new MasterOrder();
goodies.addOrder(new CookieOrder("Chocolate Chip", 1));
goodies.addOrder(new CookieOrder("Shortbread", 5));
goodies.addOrder(new CookieOrder("Macaroon", 2));
goodies.addOrder(new CookieOrder("Chocolate Chip", 3));

After the code segment has executed, the contents of the master order are as shown in the following table.


The method call goodies.removeVariety("Chocolate Chip") returns 4 because there were two Chocolate Chip cookie orders totaling 4 boxes. The master order is modified as shown below.


The method call goodies.removeVariety("Brownie") returns 0 and does not change the master order. How to Solve This

Click to reveal multiple choice questions that may help you write your solution. Mixed Up Code

Click to reveal the Mixed Up Code for the solution to this problem. Solve Part B

FRQ Cookie Order B: Complete the method removeVariety below.

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