المملكة العربية السعودية وزارة التعليم العالى

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1 KINGDOM OF SAUDI ARABIA MINISTRY OF HIGHER EDUCATION JAZAN UNIVERSITY COLLEGE OF COMPUTER SCIENCE & INFORMATION SYSTEMS FINAL EXAMINATION QUESTION PAPER(Answer Key) Term: ( Fall / Spring) Academic Year: 1436 / 1437 H Student Name : Student ID: Section Number: Level : 05 Course Name :Object Oriented Programming Course Code : COMP-213 Exam Date : 04/01/2016 Exam Day : Monday Exam Duration: 2 Hours. Start Time: 10:30 AM Maximum Marks: 40 المملكة العربية السعودية وزارة التعليم العالى جامعة جازان كلية الحاسب اآللى ونظم المعلومات SECTION A Qn. No. MARKS in numbers MARKS DISTRIBUTION MARKS TOTAL MARKS in Numbers in Words INTERNAL (40) B FINAL PRACTICAL (20) FINAL THEORY (40) C FINAL PRACTICAL (20) + FINAL THEORY (40) TOTAL MARKS (40) TOTAL (100) COURSE TEACHER (EVALUATOR) (Name, Signature & Date) GRADE اقرا التعليمات التالية بدقة: (1 ) إقرأ ورقة األسئلة جيدا ثم أجب في كراسة اإلجابة. (2( بعد نهاية االختبار سلم ورقة األسئلة وكراسة اإلجابة للمراقب. (3( أحضر معك مايلزم من المتعلقات الشخصية التي تحتاجها في االختبار مثل األقالم واآللة الحاسبة. (4 ) يجب إبراز بطاقتك الجامعية والهوية الوطنية. COURSE COORDINATOR TRACK LEADER DEPARTMENT HEAD /CEO (Name, Signature & Date) (Name, Signature & Date) (Name, Signature & Date)

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3 SECTION A (1 x 15 = 15 MARKS) Answer ALL Questions. Each Question carries ONE Mark. 1 (a) Choose the correct answer: (10 Marks) i. Which one of the following is a valid statement to import Java s utility package in a Java Program? a. import util.java.*; b. import java.util.*; c. util.java.* import; d. import package java.util.*; ii. iii. iv. Which one of the following is a valid Separator in Java? a.? b. // c. %% d. Which one of the following is a valid Java Keyword? a. value b. bool c. boolean d. character In the following class declaration, variable / attribute of the Employee class cannot be accessed outside Employee class. a. age b. Salary c. Designation d. public members of Employee class v. Which one of the following is used as one of the Java s Selection Statements? a. for b. switch c. While d. continue vi. vii. viii. ix. is one of the keyword used to manage Exception Handling in Java? a. abstract b. class c. Super d. throw Which one of the following is one of the Java s built-in Exceptions? a. MyException b. ArrayIndexOutOfBoundException c. PublicException d. ErrorException Consider a = 15, what will be the value of a after executing following statement in a Java program? a %= 5; a. 10 b. 1 c. 0 d. 2 Consider Item as a class, Which one of the following is the correct form of declaring an array of objects of the Item class? a. Item arr[ ] = new Item; b. Item[ ] arr = new Item[10]; c. Item[ ] arr = new Item; d. Item arr[ ] = new(10) Item x. Consider Course as a class, which one of the following is correct form of declaring an object of the Course class?

4 a. Course myobject = new Course[ ]; b. Course() myobject = new Course[ ]; c. Course myobject = new Course(); d. Course myobject() = new Course; 1 (b) Fill in the Blanks: (5 Marks) i. Java defines 8 primitive types. ii. iii. iv. Java s access specifiers are public, private and Protected. To inherit a class, we simply incorporate the definition of one class into another by using _extends keyword. A constructor initializes an object immediately upon creation. It has the same name as the class in which it resides and is syntactically similar to a method. v. Packages are containers of the classes that are used to keep the class name space. SECTION B (5 x 3 = 15 MARKS) Answer any FIVE Questions. Each Question carries THREE Marks. 2. Write down the output of the following program: Ans: Total fare is 600

5 3. Write a simple code in Java to create a class named Book having attributes BookName, BookISSN and BookPrice: Ans: class Book String BookName; int BookISSN; double BookPrice; 4. Change for statement in the following program by while statement to produce the same output: Ans: int a; while(a<20) System.out.println( a = + a); a++;

6 5. Write a simple code in Java to create a class that overloads a method. Ans: // Demonstrate method overloading. class OverloadDemo void test() System.out.println("No parameters"); // Overload test for one integer parameter. void test(int a) System.out.println("a: " + a); // Overload test for two integer parameters. void test(int a, int b) System.out.println("a and b: " + a + " " + b); // overload test for a double parameter double test(double a) System.out.println("double a: " + a); return a*a; class Overload public static void main(string args[]) OverloadDemo ob = new OverloadDemo(); double result; // call all versions of test() ob.test(); ob.test(10); ob.test(10, 20); result = ob.test(123.25); System.out.println("Result of ob.test(123.25): " + result);

7 6. How do we create an interface in Java? Write a simple code. Ans: interface Callback void callback(int param); class Client implements Callback // Implement Callback's interface public void callback(int p) System.out.println("callback called with " + p); 7. Find out the error in the following program and rewrite the same program after correction. Ans: class Test int a; // default access public int b; // public access private int c; // private access // methods to access c

8 void setc(int i) // set c's value c = i; int getc() // get c's value return c; class AccessTest public static void main(string args[]) Test ob = new Test(); // These are OK, a and b may be accessed directly ob.a = 10; ob.b = 20; // You must access c through its methods ob.setc(100); // OK System.out.println("a, b, and c: " + ob.a + " " + ob.b + " " + ob.getc()); SECTION C (2 x 5 = 10 MARKS) Answer any TWO Questions. Each Question carries FIVE Marks. 8. Write a program in Java that performs following tasks: i. Creates a class called Company having attributes CompName,CompLocation and a method display() that displays Company Name and Company Location. ii. Creates a subclass called PrivateCompany of the Company class having attributes CompManager, NOofEmployees. iii. Override the display() method in the subclass PrivateCompany that displays CompName,CompLocation,CompManager and NOofEmployees. iv. Creates two objects of PrivateCompany class and assign the values using constructor. 9. Write a program in Java that manages Arithmetic Exception using try and catch block. 10. Write a program in Java that creates and imports the same package.

9 Ans[ 8 ]: class Company String String CmpName; CmpLocation; void display() System.out.println( Company Name is + CmpName); System.out.println( Company Location is + Cmp Location); class PrivateCompany extends Company String CmpManager; int NOofEmployees; PrivateCompany(String cn,string cl,string cmn,int cnoe) CmpName = cn; CmpLocatoin = cl; CmpManager = cmn; NOofEmployees = cnoe; void display() System.out.println( Company Name is + CmpName); System.out.println( Company Location is + Cmp Location); System.out.println( Company Manager is + CmpManager); System.out.println( Company has + NOofEmployees + Employees. ); class Test public static void main(string args[]) PrivateCompany obj1 = new PrivateCompany( Toyota, Jeddah, Abdullah,1500); PrivateCompany obj2 = new PrivateCompany( Nissan, Riyadh, Tamir,1000);

10 Ans[ 9 ]: class Exc public static void main(string args[]) int d, a; try // monitor a block of code. d = 0; a = 42 / d; System.out.println("This will not be printed."); catch (ArithmeticException e) // catch divide-by-zero error System.out.println("Division by zero."); System.out.println("After catch statement.");

11 Ans[ 10 ]: package MyPack; public class Balance String name; double bal; public Balance(String n, double b) name = n; bal = b; public void show() if(bal<0) System.out.print("-->> "); System.out.println(name + ": $" + bal); import MyPack.*; class TestBalance public static void main(string args[]) Balance test = new Balance("J. J. Jaspers", 99.88); test.show(); // you may also call show()