1 Sample Midterm Test (Your test will have a format similar to the ...

Sample Midterm Test
(Your test will have a format similar to the sample given below)
60-322
Mock test for Fall 2012
Answer all questions
Only an unmarked copy of a textbook on Object Oriented design or on UML,
your printed class notes (unmarked) will be allowed. No computers or any
other electronic devices allowed. Answer both questions. Note that Question 2 has
2 alternatives. You are advised to answer Alternative I which carries 30 marks. If
you fail to do so, you should try answering Alternative II which carries 20 marks.
This means that, if you answer Alternative II, the maximum marks you can get will
be 40.
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Question 1) Consider the classes given below. Using UML, draw a class diagram
corresponding to these classes.
(Full marks 20)
public class Course {
private String courseNumber;
private Professor professor;
private Course preRequisiteCourses[];
private int numberOfPrerequisiteCourses = 0;
private Student studentsRegisteredInCourse[];
private int numStudentsInCourse = 0;
public Course(String courseNumber,
Professor professorOfferingCourse,
int capacityClassRoom){
this.courseNumber = courseNumber;
professor = professorOfferingCourse;
preRequisiteCourses = new Course[2];
studentsRegisteredInCourse = new Student[capacityClassRoom];
}
public void addPrerequisite(Course newPreRequisite){
preRequisiteCourses[numberOfPrerequisiteCourses] =
newPreRequisite;
numberOfPrerequisiteCourses++;
}
public void insertStudent(Student aStudent){
studentsRegisteredInCourse[numStudentsInCourse] = aStudent;
numStudentsInCourse++;
}
public double getFeesFromCourse(){
double totalFees = 0.0; //
Student aStudent;
for (int index = 0; index < numStudentsInCourse; index++){
aStudent = studentsRegisteredInCourse[index];
switch (aStudent. getStudentType())
{ case Student. CANADIANSTUDENT: totalFees += 300.00;
// Canadian students pay $300 per course
break;
case Student. CANADIANSENIOR: totalFees += 10.00;
// Canadian seniors citizens pay $10 per course;
break;
case Student. FOREIGNSTUDENT: totalFees += 1000.00;
// Foreign students pay $1000 per course;
break;
}
}
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}
return totalFees;
}
public String toString(){
String result;
result = "Course # " + courseNumber +
" is taught by " + professor. toString();
for (int index = 0; index < numStudentsInCourse; index++){
result += "\n" + studentsRegisteredInCourse[index];
}
return result;
}
public class Student {
public static final int CANADIANSTUDENT = 1;
public static final int CANADIANSENIOR = 2;
public static final int FOREIGNSTUDENT = 3;
private String studentName;
private String studentNumber;
private int studentType;
public Student(String name, String studentId, int studentType){
studentName = name;
studentNumber = studentId;
this.studentType = studentType;
}
public int getStudentType(){
return studentType;
}
public String toString(){
String result;
result = "Name is " + studentName + "; Id is " + studentNumber;
switch (studentType)
{ case CANADIANSTUDENT: return result + " - a Canadian";
case CANADIANSENIOR: return result + " - a Canadian Senior";
case FOREIGNSTUDENT: return result + " - a Foreign Student";
}
return result;
}
}
public interface Sortable {
public boolean lessThan(Sortable x);
}
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}
public abstract class Professor implements Sortable{
private String professorName;
public Professor(String professorName){
this.professorName = professorName;
}
public String getName(){
return professorName;
}
public boolean lessThan(Sortable x){
if (this instanceof PartTimeFaculty)return true;
else return false;
}
public class PartTimeFaculty extends Professor {
private String phoneNumber;
public PartTimeFaculty(String phoneNumber, String name){
super(name);
this.phoneNumber = phoneNumber;
}
public String toString(){
return super.getName() + "; Phone is " + phoneNumber;
}
}
public class FullTimeFaculty extends Professor {
private String specializationArea;
public FullTimeFaculty(String specializationArea, String name){
super(name);
this.specializationArea = specializationArea;
}
public String toString(){
return super.getName() + "; specializes in " + specializationArea;
}
}
Question 2Alternative a) Using Abstract Factory Pattern show how you can
solve the following problem. Note that you will not get any credit if you do not use
the Abstract Factory pattern in solving the problem.
Problem to be solved
All animals move in a certain way at a specified speed and eat certain food. For
instance fishes swim at 8 km/hour, dogs run at 10 km/hour, horses gallop at 20
km/hour and birds fly at 10 km/hour. Dogs eat meat, horses eat grass and birds eat
worms.
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Our client wants to write his application which will work on objects of classes such
as Fish, Dog, Horse, Bird. His applications will create a factory to generate the
animal s/he wants. Then his/her application will call methods with the following
method headers:
i) public String travel(String fromPlace, String toPlace, double distance)
ii) public String eats()
Draw a class diagram showing all the abstract classes (including the methods in
these abstract classes) you need for a factory to create horses and the relevant
classes related to the product (an object of class Horse). Even though you don’t
show it on the class diagram, it should be possible to create a factory for dogs or for
birds, using the same abstract classes.
Give the Java class definitions of
‣ all the abstract classes you need,
‣ the factory to create objects of the Horse class
‣ the Horse class itself
‣ The application that the client will use to handle the following requirements.
Requirements for Application
Consider the case of client wanting to ride a horse to travel from the University to
Devonshire Mall (a distance of 10 km). The client wishes to know how the horse
will travel (“gallop”), the time needed (0.5 hours) and what the horse will eat
(“grass”).
(Full marks 30)
Question 2 alternative II) Show how you can use JUnit test to ensure that the
following methods of class Course are working as expected:
‣ the constructor,
‣ the insertStudent method
‣ the getFeesFromCourse method
Assume that all the other class definitions have no errors. When testing the method
insertStudent, you must also make sure that the method throws an exception of an
ArrayIndexOutOfBoundsException class when you attempt to insert too many
objects of class Student into the array studentsRegisteredInCourse.
(Full marks 20)
Hints: To help you, I am giving you some fragments of code I wrote to test some of
the classes. All these tests were successful.
a) When testing Professor, I used the following lines of code:
Professor p = new FullTimeFaculty("Data Structures",
"Dr Smith");
assertEquals("Dr Smith; specializes in Data Structures",
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p.toString());
b) When testing Student, I used the following lines of code:
Student s1, s2, s3;
s1 = new Student("John", "123", 1);
assertEquals("Name is John; Id is 123 - a Canadian",
s1.toString());
s2 = new Student("Sally", "456", 2);
assertEquals("Name is Sally; Id is 456 - a Canadian Senior",
s2.toString());
s3 = new Student("Amar", "234", 3);
assertEquals("Name is Amar; Id is 234 - a Foreign Student",
s3.toString());
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1) You must sit at the desk allotted to you.
Rules and regulations
2) You must not remove the staple at the bottom right corner before you are authorized to
remove it and start writing the test.
3) Normally you will not be allowed to leave the exam hall temporarily. If you have to leave
the exam hall temporarily, you must
a) request permission from a proctor
b) have an escort with you while you are out
c) not communicate with anyone, in any way, when you are outside the Hall.
4) You must not attempt to communicate with any proctor except Dr Subir, the instructor of
the course.
5) If you need to communicate with Dr Subir, please raise your hand and some proctor will
request the person in charge to answer your question.
6) You will not be permitted to leave before 4:30 PM.
7) No student will be allowed into the exam Hall after 4:30 PM.
8) During the test the proctors will check your ID. Please have your Student card on the desk.
9) If you are caught cheating during the test in any way (e.g., communicating with any one
other than the person in charge of the exam, using a computer, using any material not
specified in this question paper), we will refer you to the Dean of Student Affairs for
disciplinary proceedings.
10) The person in charge of the exam has the authority to ask you to move to another seat
without assigning any reason.
11) You must sign the exam roster before handing in your test.
12) If you finish before 6:45 PM, you will be allowed to leave the Hall after signing the exam
roster.
13) If you do not finish by 6:25 PM, you must not attempt to leave the Hall before the exam is
finished at 6:50 PM.
14) When the exam is over, please sit quietly at your desk until the person in charge of the
hall gives you permission to leave the Hall.
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