MCA (Revised)

Term-End F,xamination

June, 2OO7

MCS -ff.l : OBJECT ORIENTEDTECHNOLOGIES AND JAVA

PROGRAMMING

Time : 3 hours Maximum Marks : 700

Nofe r Question number 1 is compulsory. Attempt any

three questions from the rest.

l. (a) What is java virtual machine ? Explain. 4

(b) What is the difference between rnethod overloading

and method overriding ? Explain with the help of

examples. 3+3

(c) What is data abstraction ? Why are classes known as

abstract data types ? 3+2

(d) When is private specifier used in a java program ?

5Explain with suitable example.

(e) What is the difference between an applet and java

application program ? 5

MCS-024 P.T.O.

(f) what happens if we apply final keyword to S

(i) a class

(ii) a function

(iii) a variable

(g) Write the output of the following :

( i ) x : - 1 0 , y : 1

X

X

(ii) String 51 : "Hello,,;String 52 : "Hello";String 53 : "HELLO";System.out.println (S1 + t'equalstt + 52 + rf )f l

+ 51 equals (Sz)h

System.out.println (S1 + "equals" + 53 + f f >f t

+ 51 . equals (S3)); 2

( i i i ) i n t i - 1 5 0 ;

byte b : byte (i.21; 2

(h) Write a program in java to print all the arguments inreverse order given at comrnand line. 6

2. (a) What are the differences in abstract classes andinterfaces in java ? Explain. 6

(b) what is finalize( ) method in java ? Explain. 4

(c) What is a package ? How do you create a package

in java ? Explain with example. s

MCS-024

(d) can you have two variables with the same name intwo interfaces which you are using to derive a newinterface ?

3' (a) ilfT:'[;T'ffi;: ]:ililothrows

? Exp'Iain6

(b) What are the rnethods of creating threads in java ?

6Explain.

(c) What is the use of super keyword in java ? Explain. s

(d) why do we need static data in a class ? s

4- (a) Write an Applet in java to print the directory in whichan HTML file containing that applet is stored . s

'|(b) Explain the three different methods used to create an

object of InetAddress class. S

(c) What are the various colour constructors ? 4

(d) Write a program in java to copy one file to anotherfile using command line arguments. g

e . g . i n t i X Y i n t i

\ /Z

Explain your answer.

MCS-024 P.T.O.

5. (a)

(b)

(c)

(d)

Write a program in java to accept an integer number

from the user. An exception is thrown if number

entered is

What are the JAR and Manifest files in java ?

Static functions can only access static data. Explain.

Differentiate between TCP client and TCP server

socket with the help of an example.

8

4

4

4

MCS-024 1 1,000