N A L A N D A O P E N U N I V E R S I T Y
Master of Computer Application Part-II
PAPER-XIX
(Object Oriented Technologies and Java Programming)
Annual Examination, 2016
Time 3 Hours. Full Marks 80
Answer any Five Questions.
All questions carry equal marks.
1. Discuss the important features of Java. Bring out the difference between the string and
stringbuffer classes in Java.
2. Explain the concept of inheritance. Give a suitable example by declaring a class and showing
two levels of inherited classes with the methods of each.
3. There are some classes that reside in a public package called myPackage. Give three ways in
which these can be accessed in the default unnamed package. If one of the classes in
myPackage has the same name as a class in the default package, how can it be referred to in
the default package
4. What are the steps involved in creating a distributed application using Remote Method
Invocation? What is polymorphism? Write a program to illustrate late binding in Java.
5. Explain the concept of nested classes in Java with examples? Write a Java program that finds
the area of a circle.
6. What are the conditions necessary for a class to be serializable? Explain with examples. When
is the "this" keyword used and why?
7. Explain the concept of abstract classes and differentiate it with interface. Define
StreamTokenizer with an example.
8. Explain constructor overloading with example. Write a Java program to read a text file and
output the number of occurrences of the sequence of letters "the" in it.
9. What are Java controls and containers? Write an applet that displays three labels and four
non-exclusive checkboxes on the screen.
10. Construct a programming problem where the switch statement cannot be used for taking
decisions. Now write a Java program to solve the problem. Explain how to compile and run a
Java Servlet.