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CUSTOMER_CODE
SMUDE
DIVISION_CODE
SMUDE
EVENT_CODE
JAN2016
ASSESSMENT_CODE MC0078_JAN2016
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
4903
QUESTION_TEXT
Explain all the java buzzword
*Simple (1 mark)
*Secure (1 mark)
*Portable (1 mark)
*Object oriented (1 mark)
*Robust (1 mark)
SCHEME OF EVALUATION
*Multi- threaded (1 mark)
*Architecture- neutral (1 mark)
*Interpreted (1 mark)
*High performance (1 mark)
*Distributed (1 mark)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
4907
QUESTION_TEXT
What is the use of Servlet Development Kit? Explain life cycle of a
Servlet.
SCHEME OF
EVALUATION
The Java Servlet Development Kit(JSDK) contains the class libraries
that you will need to create Servlets. A utility known as the
servletrunner is also included, which enables you to test some of the
Servlets that you create.
Servlet Life Cycle
i.Server loads the Servlet when it is first requested by the client or if
configured to do so, at server start – up.
ii.The server create one or more instances of the Servlet class.
iii.The server constructs a ServerConfig object that provides
initialization information to the Servlet.
iv.Server calls the init() method of each Servlet instance.
v.The server constructs aServletRequest or HttpservletRequest object
from the data included in the client’s request.
vi.The server calls the servlet’s service() method passing the objects
constructed
vii.Servlet’s service() method processes the request and returns output
to client
viii.Servlet waits until next request is received.
ix.Server unloads the Servlet after calling it’s destroy() method.
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
72815
QUESTION_TEXT
Explain the “String Buffer” class in Java with all its supporting
methods.
SCHEME OF
EVALUATION
String Buffer is a peer class of string that provides much of the
functionality of strings.
Strings Buffer defines three constructors. They are
String Buffer()
Sting Buffer (int size)
String Buffer (string str)
The default constructor reserves room for 16 characters without
reallocation.
1. The current length of a string buffer can be found via the length ()
method while the total allocated capacity can be found through the
capacity () method.
2. If you want to preallocate room for a certain number of characters
after a string buffer has been constructed you use ensure capacity () to
set the size of the buffer,.
3. To set the length of the buffer within a string buffer object use set
length ()
4. The of a single character can be obtained from a string buffer via
the char A+() method.
5. To copy a substring of a string buffer into an array use the get
chars () method.
6.The append() method concatenates the string representation of any
other type of data to the end of the invoking string buffer object.
7. The insert() method
8. Java 2 adds to string buffer the ability to delete character using the
methods delete() & delete char A+().
9. Replace () method
10. Java 2 also adds the substring() method, which returns a portion
of a string buffer.
String substring (int start Index)
String substring (int start Index, int end Index)
(Each method 1 mark)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
72816
QUESTION_TEXT
Explain the package and CLASSPATH variable in java.
SCHEME OF
EVALUATION
Package (2 marks)
To create a package is simply include a package command as the first
statement in a java source file. (2 marks)
Java users file system directories to store packages. (2 marks)
CLASSPATH (2 marks)
Consider as the root of any package hierarchy is controlled by
CLASSPATH. (2 marks).
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
72819
QUESTION_TEXT
What do you mean by CORBA? Explain its architecture?
SCHEME OF
EVALUATION
The Common Object Request Broker Architecture is a standard
architecture for distributed object systems.
The services that an object provides are given by its interface. Interfaces
are defined in OMG’s interface definition language (IDL).
The figure graphically depicts a request. A client holds an object
reference to a distributed object. The object reference is typed by an
interface. In the figure, the object reference is typed by the Rabbit
interface. The Object Request Broker, or ORB, delivers the request to
the object and returns any results to the client. In the figure, a jump
request returns an object reference typed by the AnotherObject Interface.
The ORB is the distributed service that implements the request to the
remote object.
The ORB implements location transparency.
The ORB implements programming language independence for the
request. The client using the request can be written in a different
programming language from the implementation of the CORBA object.
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
109003
QUESTION_TEXT
Explain the different access specifiers in Java.
–
Public
–
Private
–
Protected
–
Default
SCHEME OF EVALUATION