DipIETE – CS (OLD SCHEME)
Code: DC12 Subject:
OBJECT-ORIENTED PROGRAMMING THROUGH JAVA
Time: 3 Hours
Max. Marks: 100
NOTE: There are 9 Questions in all.
· Question 1
is compulsory and carries 20 marks. Answer to Q.1 must be written in the space
provided for it in the answer book supplied and nowhere else.
· Out of the
remaining EIGHT Questions, answer any FIVE Questions. Each question carries 16
marks.
· Any
required data not explicitly given, may be suitably assumed and stated.
Q.1 Choose the correct or the best alternative
in the following: (2
10)
a.
What
will be the values of x, m and n after
execution of the following statements:
int x,m,n;
m=10,n=15;
x=++m + n++;
(A)
x=25,
m=10, n=15 (B) x=27,
m=10, n=15
(C)
x=26,
m=11, n=16 (D) x=27,
m=11, n=16
b.
Consider
the following statements:
int x=10, y=15;
x=((x<y)?(y+x):(y-x));
What will be the value of x after executing these statements?
(A)
10 (B)
25
(C)
15 (D)
5
c.
The
use of ‘Final’ keyword in Java are _________.
(A)
to
handle exception
(B) to prevent Overriding and Inheritance
(C)
to
implement Abstract class
(D) None of the above.
d.
In
Java objects passed to a method by use of ________________.
(A)
call
by value method (B)
call by reference method
(C) recursive method (D) None of the above.
e.
The
code in the _______ block is executed irrespective of whether an exception is
raised or not.
(A) try (B)
catch
(C) finally (D)
All of the above.
f.
All
Exception types are subclasses of the built in class ___________.
(A) Runtime Exception class (B)
Throwable class
(C) Cast Exception class (D)
Error class
g.
The
____________ is the super class for all the classes in Java.
(A)
Object
class (B)
System class
(C)
String
class (D)
All of the above
h.
When
you implement an interface, it must be declared as __________.
(A)
private (B)
public
(C) protected (D)
None of the above.
i.
A
package is a collection of ___________.
(A)
interfaces (B) classes
(C)
editing
tools (D)
classes and interfaces
j.
The
____________ method is called just before the browser is shut down.
(A)
Stop(
) method (B) Start( ) method
(C)
Destroy(
) method (D) All of the above.
Answer any
FIVE Questions out of EIGHT Questions.
Each question carries 16 marks.
Q.2 a. Discuss the features of Java. (6)
b. List the eight basic data types in Java. (5)
c. What is class? What
are the rules for naming classes? (5)
Q.3 a. What is Constructor? Explain with
example and also its characteristics. (8)
b. Write a program in Java to generate the following
output:
1 4
9 16 25 (8)
Q.4 a. Explain the use of “Super” keyword. Use “Super” in a
program to call super class constructor.
(8)
b. Explain dynamic method dispatch with example. (8)
Q.5 a. Write a program in Java for the following: (8)
1
22
333
b.
Explain
the following with example:
(i) for
loop
(ii) do-while loop (8)
Q. 6 a. What
is Java Applet? How can we execute
Applet? (7)
b. How
can we differentiate Java Applet from Java Application? (3)
c. Find the output of the following program (6)
class Rec
{
public static void main (String
args[ ])
{
int R =abc (10);
System.out.println(“Result=“+R);
}
static int abc (int m)
{
if(m<=2)
return m;
else
return m+ abc(m-2);
}
}
Q.7 a. Discuss the rules for
coding the main( ) method in Java. (6)
b. Explain the two
ways of passing arguments to a method in java with examples. (10)
Q.8 a. What is an exception?
What is the need for exception handling and discuss exception handling
mechanism with examples. (10)
b. Find the output of the following statements:
int x=10, y,z;
y=x>15;
z=((x<15)?100:200);
System.out.println(“y=“+y);
System.out.println(“z=“+z); (6)
Q.9 Writes short notes on the following: (4 4)
(i)
Interfaces.
(ii)
Packages.
(iii)
Printer Writer Class.
(iv)
The predefined streams.