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Problem 1 Software Development & Testing (20 pts)
a. (4 pts) What is the main reason many software projects fail? a. Poorly trained programmers b. Insufficient project funding c. Complexity of projects d. Slow computers e. Insufficient computer memory
b. (4 pts) What is the software life cycle? A sequence of essential operations necessary for producing quality software.
c. (4 pts) What is the first phase of the software life cycle? a. Testing b. Coding c. Design d. Specification e. Documentation
d. (4 pts) According to the waterfall model… a. Design all algorithms before coding T or F b. Write test cases before coding T or F c. Use prototype implementation to refine design T or F
e. (4 pts) According to the unified model… a. Design all algorithms before coding T or F b. Write test cases before coding T or F c. Use prototype implementation to refine design T or F
f. (4 pts) Compared to program verification, empirical testing… a. Handles larger programs T or F b. Always catches more errors T or F c. Ensures code is correct T or F d. Can be applied without examining code T or F
g. (4 pts) Program testing a. Black box testing requires good programmers T or F b. Code coverage is a measure of code testing T or F c. Pre-conditions and post-conditions are used for empirical testing T or F
Problem 2 Object-Oriented Design (20 pts)
h. (4 pts) State and behavior are two main qualities of objects in an object-oriented system. a. What is the third quality? Identity b. What is it used for? Mechanism to distinguish between objects c. What is an example of its use in Java? Reference variables, ==, .equals(), “this”
i. (4 pts) Object oriented design… a. Produces faster programs T or F b. Produces smaller programs T or F c. Produces software without errors T or F
j. (4 pts) Abstraction and encapsulation are two principles of object-oriented design a. Define abstraction Providing a simple high-level view of an entity or activity. b. Define encapsulation Confining / hiding information so it can only be accessed through a defined interface. c. Describe how object-oriented design supports encapsulation Data is hidden inside objects and can only be accessed through its public methods.
k. (4 pts) Given the following problem description, produce an object-oriented solution. Include as many details as possible. Draw a UML class diagram (you may write code for Java classes ONLY if you don't know UML).
Design a simulation of a basketball conference. Each conference has 10 teams. Each team has 12 players. Each player has a specific height, speed, and accuracy. Players know which team they belong to. Some players are scholarship players. Scholarship players need to record their current grade-point average. Players may be transferred between teams. Teams play basketball games against other teams in the conference. The result of each game is determined using a function based on the height, strength, speed, and accuracy of the players on each team.
Team myPlayers[12] : Player playGame()
Conference myTeams[10] : Team (^) Player
myTeam : Team height speed accuracy transfer()
ScholarshipPlayer GPA
Team myPlayers[12] : Player playGame()
Conference myTeams[10] : Team (^) Player
myTeam : Team height speed accuracy transfer()
ScholarshipPlayer GPA
n. (4 pts) Consider the UML diagram on the right: a. Which class contains class D? B, F b. Which class uses class D? C c. Which class may change if class D changes? B, C, F d. How many instances of class D does class F have? 4 e. Can class A be used wherever Class C is used? No f. Can class E be used wherever Class C is used? Yes
Problem 4 Java Programming (25 pts)
o. (4 pts) Java Language Features a. Using “==” and .equals() always return the same result T or F b. Variables of type Integer and int are both references T or F c. Autoboxing creates an Integer object from an int T or F d. Exceptions are used to capture run-time errors T or F
D
E
A B
C
F
p. (4 pts) Write Java code for a Card class a. Use an enumerated type for the suits in a card deck (Spades, Hearts, Diamonds, Clubs) b. Implement the comparable interface for Card objects so that the suits are ranked in the order listed (Spades > Hearts > Diamonds > Clubs)
public class Card implements Comparable { public enum Suit {Spades, Hearts, Diamonds, Clubs} private Suit mySuit; Card (Suit s) { mySuit = s; } Card (int i) { if (i == 1) mySuit = Suit.Spades; else if (i == 2) mySuit = Suit.Hearts; else if (i == 3) mySuit = Suit.Diamonds; else mySuit = Suit.Clubs; } public Suit getSuit() { return mySuit; } public String toString(){ return mySuit.toString(); }
public int compareTo(Object o) { // return 1 if greater, 0 if equal, -1 if less than Card card = (Card) o; Suit c = card.getSuit(); if (mySuit == Suit.Spades) { if (c == Suit.Spades) return 0; else return 1; } else if (mySuit == Suit.Hearts) { if (c == Suit.Spades) return -1; else if (c == Suit.Hearts) return 0; else return 1; } else if (mySuit == Suit.Diamonds) { if ((c == Suit.Spades) || (c == Suit.Hearts)) return -1; else if (c == Suit.Diamonds) return 0; else return 1; } else // (mySuit == Suit.Clubs) { if (c == Suit.Clubs) return 0; else return -1; } public static void main(String[] args) { // prints 1 0 - Card s = new Card(Suit.Spades); Card h = new Card(Suit.Hearts); System.out.println("S vs H = "+s.compareTo(h)); System.out.println("S vs S = "+s.compareTo(s)); System.out.println("H vs S = "+h.compareTo(s)); } }
Because we cannot predict the time and occurrence of an event c. How are events handled in Java Swing? Create and register an EventListener object for each event, Java will invoke a method in the EventListener whenever the event occurs
t. (4 pts) Given Java Swing code for a GUI, understand the different roles of each part
import java.awt.Dimension; import javax.swing.*;
public class Application extends JPanel { private static final int FRAME_WIDTH = 300; private static final int FRAME_HEIGHT = 400; private static final int XCOORD = 100; private static final int YCOORD = 200; private JFrame frame; private String title = "Second Example";
public Application() { // Creates Java frame object with desired dimensions frame = new JFrame(); frame.setContentPane(this); frame.setLocation(XCOORD, YCOORD); frame.setSize(new Dimension(FRAME_WIDTH, FRAME_HEIGHT)); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); frame.setTitle(title); frame.setVisible(true);
// MouseHandler class will take care of mouse events addMouseListener(new MouseHandler()); }
public static void main(String[] args) { new Application(); } }
public class MouseHandler implements MouseListener {
public void mouseClicked(MouseEvent e){ // Handler called when event occurs
// Performs activity to handle event } … }
