CMSC132 Summer 2006 Midterm 1 Grader Use Only 1 2 3 4 5 Total First Name 25 25 20 10 20 100 Last Name Student ID I pledge on my honor that I have not given or received any unauthorized assistance on this examination Your signature General Rules Read This exam is closed book and closed notes If you have a question please raise your hand Total point value is 100 points The short answer questions are not essay questions Strive to answer them in 1 or 2 sentences Longer answers are not necessary and are discouraged WRITE NEATLY If we cannot understand your answer we will not grade it i e 0 credit PUNT RULE For any question you may write PUNT and you will get of the points for the question rounded down If you feel totally lost on a question you are encouraged to punt rather than waste time writing down a bunch of vaguely related verbiage in hopes of getting some partial credit 1 Problem 1 Software Development 25 pts a 4 pts The software life cycle is a sequence of essential operations necessary for producing quality software Mention four of those essential operations 2 b 3 pts Describe the unified model of software development c 3 pts What are three principles Extreme Programming is based on d 2 pts What is encapsulation e 2 pts What is Clear box testing f 2 pts What is Beta testing g 2 pts What is Alpha testing h 2 pts What is Regression testing i 3 pts Briefly explain whether we can have a program with an infinite number of flow paths j 2 pts What are the advantages of the Model View Controller Problem 2 UML 25 pts Given the following Java code draw its complete include fields and method information UML class diagram public interface Cd public int maxmem 3 public class En public String rev public class Rw public int len public double ms public class Ve public int id public String desc public class Pl extends Ve implements Cd private String n private int max public int maxmem return max public Pl String n int max this n n this max max public void lan Rw r System out println Processing r len public String toString return n max DRAW THE DIAGRAM ON THE NEXT PAGE UML DIAGRAM GOES HERE 4 Problem 3 Java Programming 20 pts a 3 pts What is the difference between a checked and an unchecked exception 5 b 4 pts Rewrite the following for loop using the new enhanced for loop ArrayList String c new ArrayList String c add Mary c add Robert c add Raymond for int i 0 i c size i System out println c get i length c 6 pts An interface named Manager declares the following method public void distributeSchedules Using anonymous classes replace the comment in the following main with an object that implements the Manager interface The distributeSchedules method should print the message Schedules have been distributed public static void main String args Manager myManager PUT YOUR CODE HERE d 7 pts Modify the following class so we can sort Highway objects by id using the Colletions sort method public class Highway public int id public String name public Highway int id String name this id id this name name YOU CAN USE THE NEXT PAGE TO ANSWER THE ABOVE QUESTIONS 6 Problem 4 Writing Test Cases 10 pts The linearSearch method returns the array index where searchValue appears in the array or 1 if searchValue is not part of the array You can assume elements of the array are unique public static int linearSearch String array String searchValue int searchIndex 1 for int i 0 i array length i if array i equals searchValue searchIndex i return searchIndex 7 A possible JUnit test for this code is the following public class MyTests extends TestCase String data new String JL MJ PK public void testOne assertTrue Utilities linearSearch data MJ 1 a Using the data array provided above write as many assertions you understand are necessary to verify the correctness of the linearSearch method You don t need to provide JUnit test cases just assertions e g assertTrue b Are there any assertion s the above code will fail Problem 5 Design 20 pts For this problem you will provide a design for a system used to maintain information about computers The specifications for the system are Two kinds of computers are possible desktops and laptops A laptop is classified as a portable device All computers are classified as electronic devices and all have at least one USB port Only desktops have CRT displays that can be shared among different desktops About your UML class diagram Your UML class diagram should only illustrate the relationships that exist among the different classes interfaces that are part of your design You don t need to add any information regarding instance variables or methods If you use abstract classes make sure you represent them by enclosing their names in 8 YOU CAN USE THE NEXT PAGE FOR YOUR UML 9
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