(1) This document provides instructions for a midterm exam on Programming II taken by students at Al Imam Mohammad Ibn Saud Islamic University. The exam contains 4 questions to be completed in 90 minutes. (2) Question 1 contains 8 multiple choice questions about object-oriented programming concepts like interfaces, inheritance, and polymorphism. (3) Question 2 asks students to identify 3 errors in a code sample and provide corrections. (4) Question 3 asks students to provide the output of 3 code segments. (5) Question 4 asks students to design classes to model a medical staff management system, including abstract and concrete classes, and to write a test class demonstrating polymorphism.

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Al Imam Mohammad Ibn Saud Islamic University
College of Computer and Information Sciences
Computer Science Department
Course Title: Programming II
Course Code: CS141
Course
Instructor:
Dr Abdulrahman Albarrak Dr. Qaisar Abbas,
Dr Ashraf Shahin
Exam: Midterm
Semester: Fall 2016
Date: 22th Nov 2016
Duration: 90 Minutes
Marks: 20
Privileges: ☐ Open Book
☐ Calculator
Permitted
☐ Open Notes
☐ Laptop Permitted
Student Name (in
English):
Student ID:
Section No.:
Instructions:
1.Answer all questions; there are 4 questions in 7 pages.
2.Write your name on each page of the exam paper.
3.Write your answers directly on the question sheets. Use the ends of the question
pages for rough work or if you need extra space for your answer.
4.If information appears to be missing from a question, make a reasonable
assumption, state your assumption, and proceed.
5.No questions will be answered by the invigilator(s) during the exam period.
Official Use Only
Question Student Marks Question Marks
1 4
2 3
3 3
4 10

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Total
Student Name (in
English):
__________________________________________ Student
ID:
_____________________________
Question 1: To be answered in ( ___ ) Minutes [ ] / 4 Marks
Select one or more appropriate options from multiple choice questions and try fill in
the following box with your choice for each point.
Note that if you did not find an appropriate answer then you can write your own
answer with some reasons.
Question 1 2 3 4 5 6 7 8
Answer
1. Which of the following is not true?
(a) An interface can extend another interface.
(b) A class which is implementing an interface must implement all the methods of
the interface.
(c) An interface can implement another interface.
(d) An interface is a solution for multiple inheritance in java.
(e) None of the above.
2. The fields in an interface are implicitly specified as,
(a) static only
(b) protected
(c) private
(d) both static and final
(e) none of the above.
3. To prevent any method from overriding, we declare the method as,
(a) static (b) const (c) final (d) abstract (e) none of the
above.
4. Which one of the following is not true?
(a) A class containing abstract methods is called an abstract class.
(b) Abstract methods should be implemented in the derived class.
(c) An abstract class cannot have non-abstract methods.
(d) A class must be qualified as ‘abstract’ class, if it contains one abstract method.
(e) None of the above.
5. Which statement is not true in java language?

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(a) A public member of a class can be accessed in all the packages.
(b) A private member of a class cannot be accessed by the methods of the same
class.
(c) A private member of a class cannot be accessed from its derived class.
(d) A protected member of a class can be accessed from its derived class.
(e) None of the above.
6. Which of the following concepts means wrapping up of data and functions
together?
(a) Abstraction
(b) Encapsulation
(c) Inheritance
(d) Polymorphism
7. Which of the following is correct about function overloading?
(a) The types of arguments are different.
(b) The order of argument is different.
(c) The number of argument is same.
(d) Both A and B.
8. How many instances of an abstract class can be created?
(a) 1 (b) 5 (c) 13 (d) 0

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Student Name (in
English):
__________________________________________ Student
ID:
_____________________________
Question 2: To be answered in ( ___ ) Minutes [ ] / 3 Marks
Let be the following code:
There are three mistakes in this code. Please find those mistakes and make the code
error free. Write the line number and clearly specify the problem.
Line No Error Correction
1. abstractclassEx {
2. static intx=2;
4. public abstractvoid set(inta);
5. public abstractvoid print();
6. public static intgetX()
7. {return this.x;}
8. }
9. class Ex1 extends Ex {
10. privateint y;
11. public Ex1()
12. { y=3; }
13. public void print()
14. { System.out.println(y); }
15. }
16. classEx2 extends Ex1 {
17. privateint z;
18. public Ex2()
19. { z=5; }
20. @Override
21. public void set(int a)
22. {z=a; }
23. public int get()
24. {return z; }
25. public void print()
26. {
27. super.print();
28. System.out.println(z);
29. }
30. }
31. classExRun {
32. public static void main (String[] args){
33. Ex a=new Ex1();
34. Ex b=new Ex2();
35. if( b instanceof Ex2)
36. { System.out.println( ((Ex2)b).get()); }
37. }
38. }

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Student Name (in
English):
__________________________________________ Student
ID:
_____________________________
Question 3: To be answered in ( ___ ) Minutes [ ] / 3 Marks
Provide the output(s) of the following code segments and fill in the following box
with outputs for each point.
Question 1 2 3
outputs
(1)
class Test1 {
public inta;
public Test1()
{ a=5;
print();
}
public void print()
{System.out.println(a);}
}
class Testextends Test1{
public intb;
public Test()
{
b=3;
}
@Override
public void print()
{System.out.println( b);}
}
class RunTest{
public static void main (String[] args){
Test1 e=new Test() ;
}
}
(2)
class Test1 {
public static intcount=2;
int x=5;
public Test1()
{ x++;

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count+=x;
}
public intgetCount()
{ return this.count; }
}
public classTest{
public static void main(String[] args) {
Test1 a;
Test1 b=new Test1();
Test1 c=new Test1();
System.out.println(b.getCount());
}
}
(3)
class Ex {
privateint x;
public Ex()
{ x=2;}
public void print()
{ System.out.println( x);}
}
class Ex1 extends Ex{
privateint y;
public Ex1()
{ y=5; }
@Override
public void print()
{ System.out.println( y);}
}
class ExRun {
public static void main (String[] args){
Ex a=new Ex1();
a.print();
}
}

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Student Name (in
English):
__________________________________________ Student
ID:
_____________________________
Question 4: To be answered in ( ___ ) Minutes [ ] / 10 Marks
A new medical staff management system is created for a small hospital. In this system, the
medical staff are of three types: (i) doctor, (ii) nurse and (iii) therapist. Each medical staff has
the following attributes: a name (type String), joined Date (type Date), a social security
number (type int) and education (type String). These attributes are fixed once they added to
the system. For each doctor we need to consider the specialty (String), rank (String),
department(String). For each nurse, a ward number (type int), type(String), Skills (String),
role(String) are taken into consideration. For a therapist, treatment Type (String),
skills(String), function(String) are stored. We need to know the number of staff in the hospital
and we need to know the number of staff for each type.
(a) Write the needed abstract and concrete classes to represent the system. For each class
provide a toString method that returns a String representation of an object of the class with
its attributes and the attributes of its superclass (5 points).
(b) Declare the Test class that contains public static void main(String[] args). In the main take
the number of staff to be added to the system and for each staff allow the user to select the
type of staff (Doctor, Nurse, Therapist) to be add to the system (use switch). The program
should be implemented using polymorphism (demonstrating polymorphic behavior when
dealing with staff). Once you have added all the staff print the number of all staff and the
number of staff in each type. Write a loop to print all the staff information (call to String (5
points).
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