C Sc 335 Spring 2007 ___
Practice Quiz 1 Section Leader ____________ Name _______________________ 50 pts max
1. Interfaces (10pts)
In the box, write class MyInteger so its objects can be stored inorder into a TreeSet or sorted with
java.util.Collections.sort. Each compareTo message must return the difference in value with a
negative value indicating the object is less than the argument. Complete the unit test by filling in the ____'s.
public interface Comparable<T> {
public int compareTo(T other);
}
import static org.junit.Assert.*;
import org.junit.Test;
public class MyIntegerTest {
@Test
public void testMyInteger() {
MyInteger a = new MyInteger(2);
MyInteger b = new MyInteger(5);
assertEquals(____, a.compareTo(b));
assertEquals(____, b.compareTo(a));
assertEquals(____, a.compareTo(a));
}
}
2. Find the Objects (15pts)
The University of Arizona Bookstore has decided that there is just too much traffic in the bookstore at the
beginning of each semester. In an effort to reduce in-house traffic, the bookstore has decided to implement an
online storefront where students can purchase all of their books online and just pick them up sometime after
they’ve been purchased. You are to do some analysis and come up with a model for the bookstore’s new online
front. Here are the specifications
oA student may remove one to many items from the shelf and place them into a shopping basket
oA student should be able to remove items from a shopping basket and place them back on the shelf
oA student should be able to purchase the items in their shopping basket
oTo check out, a student must give their shopping basket to the cashier (there is only one cashier)
oThe cashier creates an order that consists of a item, quantity, and a price based on the item’s ISBN
oIf the CatCard has enough money then the total amount will be deducted and the items will be removed
from inventory, a claim check confirmation for the order will be sent to the student’s email address
oIf the CatCard funds are insufficient, place all back on the shelf
Create a list of the five most important objects to model this system along with the major responsibility:
Candidate Object Major Responsibility
