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PROGRAM
BCA(REVISED FALL 2012)
SEMESTER
4
SUBJECT
CODE &
NAME
BCA
4020 - JAVA PROGRAMMING
Q1.
Why is security required in Java? What is the use of Digital Signature?
[6+4]
Answer:
Java's security model is one of the key architectural
features that makes it an appropriate technology for networked environments.
Security is important because networks represent a potential avenue of attack
to any computer hooked to them. This concern becomes especially strong in an
environment in which software is downloaded across the network and executed
locally, as is done, for example, with Java applets and Jini service objects.
Because the class
Q2.
Write short notes on;
a)
Single dimensional Arrays
b)
Multi-Dimensional Arrays
Answer:
One-dimensional
arrays
A one-dimensional array (or single dimension array) is
a type of linear array. Accessing its elements involves a single subscript
which can either represent a row or column index.
As an example consider the
Q3.
Differentiate between packages and Interfaces.(5+5)
Answer.
Packages and Interfaces
Packages
Java provides a
mechanism for partitioning the class name space into more manageable chunks.
This mechanism is the package. The package is both a naming and a visibility control
mechanism. You can define classes inside a package that are not
Q4.
What are Applets? What are the restrictions of Applets? Describe about applet
class.(2+3+5)
Answer.
Applets
An applet is a Java
program that can be embedded in a web page. Java applications are run by using
a Java interpreter. Applets are run on any browser that supports Java. Applets
can also be tested using the appletviewer tool included in the
Q5.
Compare JDBC and ODBC (5*2)
Answer.
JDBC and ODBC
Java Data Base
Connectivity (JDBC)
The JDBC API (Java
Data Base Connectivity Application Program Interface) can access any kind
of tabular data, especially data stored in a Relational Database. It
works on top of ODBC (Open Data Base Connectivity) which was the driver
for
Q6.
Describe about Java Beans and BeanBox. (5+5)
Answer.
Java Beans and BeanBox
Java Beans
JavaBeans is the
software component architecture for Java. It allows constructing applications
efficiently by configuring and connecting components called Beans. The Beans
need to be written and tested with a rich set of mechanisms for interaction
between objects, along with common actions that most objects will need to
support such as persistence and event
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we will revert you within 2-3 hour or immediate
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