Gujarat University 2003 B.C.A Computer Application Internet Technologies - Question Paper

Time : three Hours Total Marks : 50

1 Attempt any ten : 10

(1) What is the use of Javah ?
(2) What is Method Overloading ?
(3) What is the use of finalizer ?
(4) discuss 'Super' Keyword.
(5) elaborate Wrapper Classes ?
(6) discuss the Java.Util.Date class.
(7) The name of a Java program file must match the name
of class with the extension. Java. (True / False).
(8) The break statement is needed in the default case of
Switch Selection Structure (True / False)
(9) When Present, package must be the 1st non-comment
statement in the file. (True / False).
(10) A method declared as stalic can not access non-static
class members. (True / False)
(11) Throwing an exception always causes program
termination. (True / False).
(12) Any method in a super class can be overridden in its
subclass.

2 ans the subsequent : (any five) 10
(1) Why Java is known as platform independent ?
(2) Differenciate ranging from Java and C.
(3) discuss kind conversion and kind casting.
(4) When do we declare a method or class as final ?
(5) How can we set priority of a thread ?
(6) Differenciate ranging from string and stringbuffer class.
(7) What is Stream ? discuss Filtered stream.

3 (a) ans the subsequent : (any two) 6
(1) explain Java Environment (API & JDK)
(2) discuss life cycle of thread with diagram.
(3) What is package ? discuss how do we add a class
or an interface in a package.
(b) Differentiate the subsequent : (any two) 4
(1) Interface and abstract class.
(2) Instance variable and class variable.
(3) Applet and Application.

4 (a) List any 4 inbuilt exceptions. Also discuss how 5
can you throw your own exception.
OR
(a) discuss Life cycle of an Applet. 5
(with diagrams)
4 (b) What is E - Commerce ? discuss B2B, B2C and 5
C2C business Models.
OR
(b) List out any 6 ASP objects. discuss any 2 5
objects of them.
5 Attempt any 2 : 10
(1) Write a program that counts number of words, and lines
in the file. Take the file name as a command line
arguments.
(2) Write a code for an applet that let the user enter two
numbers from the 2 text fields. When user press a
button, with the caption "Multiply" it displays
Multiplication in 3rd text field.
(3) Write a program that accepts 5 numbers from the
commandline arguments and store them in a vector.
Also write methods for :
(1) To delete an element
(2) To add an element at a Specified Location
(3) To add an element at the end.
(4) To Print the contents of the vector.

Earning:   Approval pending.