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DEPARTMENT OF INFORMATION TECHNOLOGY

IMPORTANT QUESTIONS
SUBJECT : Object Oriented Programming
SEM / YEAR: III Sem/ II Year

UNIT I INTRODUCTION TO OOP AND JAVA FUNDAMENTALS

Object Oriented Programming - Abstraction – objects and classes - Encapsulation- Inheritance -
Polymorphism- OOP in Java – Characteristics of Java – The Java Environment - Java Source File -
Structure – Compilation. Fundamental Programming Structures in Java – Defining classes in Java –
constructors, methods -access specifiers - static members -Comments, Data Types, Variables,
Operators, Control Flow, Arrays , Packages - JavaDoc comments
PART – A
BT
Q.No. Questions Competence
Level
1 Define Objects and classes in java BTL1 Remembering
2 Name the types of Array BTL1 Remembering
3 List any four java Doc comments BTL1 Remembering
4 Define access specifier? give example BTL1 Remembering
5 Define objects and object variable BTL1 Remembering
6 What is the need of overloaded constructors BTL1 Remembering
7 Describe default constructor BTL2 Understanding
8 Express what is meant by java package BTL2 Understanding
9 Enumerate two situations in which static methods are used BTL2 Understanding
10 Express what is the default access to a member in a class BTL2 Understanding
11 Illustrate with example how to import a single package? BTL3 Applying
Show how could Java classes direct program messages to the system
12 BTL3 Applying
console, but error messages, say to a file
13 Demonstrate private access specifier BTL3 Applying
14 Differentiate procedural Vs Object - oriented Programming BTL4 Analyzing
15 Explain the features of Java BTL4 Analyzing
Can an inner class declared inside of a method access local variables
16 BTL4 Analyzing
of this method?
17 Justify what is the need for javadoc multiline comments BTL5 Evaluating
Conclude what can go wrong if you replace && with & in the
18 BTL5 Evaluating
following code: String a=null; if (a!=null && a.length()>10) {...}
Consider a loan processing system in a Bank. Identify the classes and
19 BTL6 Creating
objects in system and list them
Generalize the ways by which the members of a package can be
20 BTL6 Creating
accessed by other package?

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PART – B
1 Explain the types of package with its importance BTL1 Remembering
i. What is method? How method is defined? give example(6) BTL1 Remembering
2 ii. State the purpose of finalize() method in java? With an example
explain how finalize() method can be used in java program(7)
i. What is class? how do you define a class in java(6) BTL1 Remembering
3 ii. Define Package? How does compiler locate packages? Explain
arrays in java?(7)
i. Explain the features of Java and list out the characteristics of BTL1 Remembering
4 JAVA(7)
ii. Explain the characteristics of OOPs(6)
Summarize the types of constructors supported by JAVA with BTL2 Understanding
5 example.
i. Discuss the usage of constructor with an example using java(7) BTL2 Understanding
6 ii. Explain the object constructors and calling other constructor with
example(6)
With relevant examples describe abstraction and encapsulation. Write BTL2 Understanding
7 a java program that uses an abstraction and encapsulation.
Illustrate what is polymorphism? Write a java program that implements BTL3 Applying
8 Polymorphism.
Illustrate with an example the following features of constructors: BTL3 Applying
i. Default constructors (2)
ii. Parameterized constructor (2)
9 iii. Overloaded constructors (2)
iv. A call to another constructor with this operator( 2)
v. An object initialization block(2)
vi. A static initialization block(3)
i. Illustrate OOPS and explain the features of OOPS (7) BTL3 Applying
10 ii. Demonstrate the static fields and methods used in java (6)
BTL4 Analyzing
i. Distinguish argument and parameter? Discuss with example(7)
11
ii. Differentiate constructor and method with example(6)
12 Difference between OOPS and procedural programming language BTL4 Analyzing

13 Assess the different methods in java. Util. Arrays class with example BTL5 Evaluating
Create a Java program for push and pop operations in stack using BTL6 Creating
14 arrays in classes and object
PART – C
Write a program to perform the following functions using classes, BTL5 Evaluating
objects, constructors and destructors where essential
1 i. Get as input the marks of 5 students in 5 subjects (5)
ii. Calculate the total and average (5)
iii. Print the formatted result on the screen (5)

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Make a class Student. The Student class has data members such as roll BTL6 Creating
number, name, branch. Create a class called Exam that has data
2 members roll number and six subject marks. Derive the result class
from Student and Exam it has own data members such as total mark,
and result. Write a Java program to model the relationships.
Create a java program to find a smallest number in the given array by BTL6 Creating
3 creating one dimensional array and two dimensional array using new
operator.
i. Write a Java program to Evaluate the following series 1-2+3- BTL5 Evaluating
4+…+n .(8)
4 ii. Write a Java program to test the prime numbers between the given
two limits(7)
UNIT II INHERITANCE AND INTERFACES
Inheritance – Super classes- sub classes –Protected members – constructors in sub classes- the Object
class – abstract classes and methods- final methods and classes – Interfaces – defining an interface,
implementing interface, differences between classes and interfaces and extending interfaces - Object
cloning -inner classes, ArrayLists - Strings
PART – A
BT
Q.No. Question Competence
Level
1 Define inheritance hierarchy. Give an example BTL1 Remembering
2 How will you define an interface in java program BTL1 Remembering
3 What is meant by abstract classes BTL1 Remembering
4 What is object cloning BTL1 Remembering
5 Define static inner classes BTL1 Remembering
6 What is class hierarchy? Give example BTL1 Remembering
7 In java describe the use of Interfaces? BTL2 Understanding
8 Describe the purpose of the keyword “final” BTL2 Understanding
Summarize static binding (early binding) and dynamic binding (late
9 BTL2 Understanding
binding)
Describe wrapper classes? Why the wrapper classes are defined as
10 final BTL2 Understanding

11 Show how to prevent inheritance BTL3 Applying

Demonstrate the conditions to be satisfied while declaring abstract
12 BTL3 Applying
classes
13 Illustrate the usage of super keyword? BTL3 Applying
14 Differentiate shallow and deep copy in object cloning BTL4 Analyzing
15 Distinguish between copying and cloning BTL4 Analyzing
16 Assess how to reverse ArrayList in Java BTL4 Analyzing
17 Deduce the meaning for the keywords : final, finally, finalize BTL5 Evaluating
18 In how many ways you can create string objects in java BTL5 Evaluating

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19 Create a java program to remove all white spaces from a string in java BTL6 Creating
If ObjA1 is an object of a class A created using new keyword, what
20 BTL6 Creating
does the statement A ObjA2=ObjA1; mean?
PART – B

Define Inheritance? With diagrammatic illustration and java

1 programs illustrate the different types of inheritance. BTL1 Remembering
What is interface? Write a java program to illustrate the use of
2 interface. BTL1 Remembering
3 Write briefly on Abstract classes with an example BTL1 Remembering
List the type of constructors and the concept of destructor with
4 BTL1 Remembering
example
Describe the sophisticated layout management in user interface
5 BTL2 Understanding
component with example
i. Explain the function of object wrapper and auto boxing with
6 suitable example (8) BTL2 Understanding
ii. State the design hints for inheritance(5)
7 Summarize the concept of supper classes and sub classes BTL2 Understanding
8 Illustrate briefly about final methods and classes BTL3 Applying
i. Demonstrate any six methods available in the StringBuffer class(7)
9 BTL3 Applying
ii. What is meant by object cloning? Explain it with an example(6)
i. How to define an interface? Why do the members of interface are
10 static and final?(7) BTL4 Analyzing
ii. Explain about inner classes and its types with examples(6)
11 Explain the concept of object cloning and inner classes with examples BTL4 Analyzing
i. Differentiate arrays and strings (7)
12 BTL4 Analyzing
ii. Write a java program to find the given string is palindrome or not (6)
Write a Java program to create a student examination database system
that prints the mark sheet of students. Input student name, marks in 6
13 subjects. This mark should be between 0 and 50. If the marks are not BTL5 Evaluating
in specified range, exception is thrown else find the total marks and
print percentage of students
Declare an abstract class to represent a bank account with data
members name, account number, address and abstract methods
withdraw and deposit. Method display() is needed to show balance.
14 Derive a subclass Savings Account and add the following details: BTL6 Creating
return on investment and the method calcAmt() to show the amount in
the account after 1 year. Create instance of Savings Account and
show the use of withdraw and deposit abstract methods
PART – C

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Create a static Inner class called Pair which has MinMax method for
1 BTL6 Creating
finding min and max values from the array
Develop an Employee class which implements the Comparable and
Cloneable interfaces. Implement the sorting of persons (based on
2 name in alphabetical). Also implement the shallow copy (for name BTL5 Evaluating
and age) and deep copy (for DateOfJoining)
Develop an Interest interface which contains simpleInterest and
3 compInterest methods and static finalfield of Rate 25%. Write a class BTL5 Evaluating
to implement those methods
Create a abstract Reservation class which has Reserve abstract
4 method. Implement the sub-classes like ReserveTrain and ReserveBus BTL6 Creating
classes and implement the same
UNIT III EXCEPTION HANDLING AND I/O
Exceptions - exception hierarchy - throwing and catching exceptions – built-in exceptions, creating own
exceptions, Stack Trace Elements. Input / Output Basics – Streams – Byte streams and Character
streams – Reading and Writing Console – Reading and Writing Files
PART – A
BT
Q.No. Question Competence
Level
1 List the different ways to handle exceptions BTL1 Remembering
Examine the purpose of the finally clause of a try-catch-finally
2 BTL1 Remembering
statement
3 Tell the use of assert keyword BTL1 Remembering
4 Define a file? Why do we require files to store data BTL1 Remembering
What is the basic difference between the 2 approaches to exception
5 BTL1 Remembering
handling
What if there is a break or return statement in try block followed by
6 finally block BTL1 Remembering

7 Summarize output streams and input streams in Java BTL2 Understanding

8 Describe runtime exceptions BTL2 Understanding
9 Interpret Checked and UnChecked Exception BTL2 Understanding
10 Give any two methods available in stack tree element BTL2 Understanding
11 Is it necessary that each try block must be followed by a catch block BTL3 Applying
12 How are the stream classes classified BTL3 Applying
13 Show how Java handle integer overflows and underflows BTL3 Applying
14 State the difference between an exception and error BTL4 Analyzing
15 Compare Input stream and Reader classes BTL4 Analyzing
Classify the basic difference between the two approaches to exception
16 BTL4 Analyzing
handling.
Does it matter in what order catch statements for
17 BTL5 Evaluating
FileNotFoundException and IOException are written?

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Decide What type of exception must be explicitly declared in a throws

18 BTL5 Evaluating
clause of a method?
19 Write a java program to read the file contents BTL6 Creating
Create a Random Access file stream for the file “student.dat” for
20 uploading the student information in the file BTL6 Creating

PART – B
Define exception. Why it is needed? Explain the different types of
1 exceptions and the exception hierarchy with appropriate examples BTL1 Remembering
using Java
2 What is mean by filter stream? Explain with examples BTL1 Remembering
Explain briefly about user defined exceptions and the concept of BTL1 Remembering
3 throwing and catching exception in java with examples

4 What are input and output streams? Explain them with illustrations BTL1 Remembering
5 Describe the stack trace elements with an example BTL2 Understanding
Summarize the concept of streams and stream classes and their
6 classification BTL2 Understanding

Express the most commonly used classes for handling i/o related
7 BTL2 Understanding
exceptions
How exceptions are handled in Java? Explain the important methods
8 BTL3 Applying
used to handle exception
While reading a file how would you check whether you have reached
9 BTL3 Applying
the end of the file
Explain how to handle arithmetic exception by giving a suitable
10 BTL4 Analyzing
example
Differentiate byte stream and character stream with necessary
11 BTL4 Analyzing
examples
12 Explain the importance of try - catch block with example BTL4 Analyzing
Evaluate a try block that is likely to generate three types of exception
13 and then incorporate necessary catch blocks and handle them BTL5 Evaluating
appropriately
14 Create a new directory by using File object? BTL6 Creating
PART – C
Why only read() methods in ByteArrayInputStream does not throw
1 IOException? BTL6 Creating
How does InputStream.read() method work? Can you give me some
2 sample code? BTL6 Creating

There are three statements in a try block – statement1, statement2 and

statement3. After that there is a catch block to catch the exceptions
3 occurred in the try block. Assume that exception has occurred in BTL5 Evaluating
statement2. Does statement3 get executed or not?

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Why it is always recommended that clean up operations like closing

4 the DB resources to keep inside a finally block? BTL5 Evaluating

UNIT IV MULTITHREADING AND GENERIC PROGRAMMING

Differences between multi-threading and multitasking, thread life cycle, creating threads, synchronizing
threads, Inter-thread communication, daemon threads, thread groups. Generic Programming – Generic
classes – generic methods – Bounded Types – Restrictions and Limitations
PART – A
BT
Q.No. Question Competence
Level
1 Identify the different states in thread BTL1 Remembering
2 What do you mean by threads in Java BTL1 Remembering
3 Define multithreading BTL1 Remembering
4 List out the motivation needed in generic programming BTL1 Remembering
5 Tell the methods of executors BTL1 Remembering
6 What is meant by notify methods in multithreading BTL1 Remembering
7 Describe synchronization in respect to multithreading BTL2 Understanding
8 Summarize generic classes with example BTL2 Understanding
9 Express the need for generic code? BTL2 Understanding
10 Describe life cycle of thread BTL2 Understanding
11 Demonstrate how do we set priorities for threads BTL3 Applying
12 How to start a thread BTL3 Applying
13 Show how the inter thread communication is done BTL3 Applying
14 Who wants to be generic programmer BTL4 Analyzing
15 Assess how will interrupt threads in multiple windows BTL4 Analyzing
16 Thread is a light weight process. Comment on this statement. BTL4 Analyzing
Assess why do we need run() and start() method both? Can we
17 BTL5 Evaluating
achieve it with only run method?
18 Why separate wait and sleep methods used in java programming? BTL5 Evaluating
19 Develop java interface must be implemented by all threads BTL6 Creating
Generalize some real life situations that illustrate the use of
20 BTL6 Creating
multithreading
PART – B
1 List the two ways of implementing threads with example BTL1 Remembering
2 Label the different states of a thread and explain it BTL1 Remembering
3 Define the concept of Generic Type Information in virtual machine BTL1 Remembering
4 Tell briefly about reflection and generics. Give an example BTL1 Remembering
What is a thread? Describe the lifecycle and states of thread with
5 BTL2 Understanding
examples.

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6 Discuss about translating generic expressions and calling legacy code BTL2 Understanding
7 Summarize briefly about thread synchronization with an example BTL2 Understanding
Demonstrate Inter thread Communication and suspending, resuming
8 BTL3 Applying
and stopping threads
Show how to extend thread class and how to implement runnable
9 interface for creating and starting threads? BTL3 Applying

10 Classify the generics in java with example BTL4 Analyzing

Explain the task for running a task in a separate thread and running
11 BTL4 Analyzing
multiple threads
i. Mention the motivations of generic programming. (7)
12 ii. Explain briefly about generic classes and methods in Java BTL4 Analyzing
programming(6)
13 Evaluate how generic methods and generic expressions are translated BTL5 Evaluating
Design two threads to display odd numbered element in an array of
14 size 50 and even numbered element in another array of size 50. Create BTL6 Creating
instances of the above thread and run them
PART – C
Create a simple real life application program to illustrate the use of
1 multithreads BTL6 Creating
To avoid deadlock in Java where N threads are accessing N shared
2 resources : Conclude. BTL5 Evaluating

Evaluate which one is better to implement thread in Java ? extending

3 Thread class or implementing Runnable? BTL5 Evaluating
Define an exception called “NoMatchException” that is thrown when
4 a string is not equal to “India”. Create a program that uses this BTL6 Creating
exception
UNIT V EVENT DRIVEN PROGRAMMING
Graphics programming - Frame – Components - working with 2D shapes - Using color, fonts, and
images - Basics of event handling - event handlers - adapter classes - actions - mouse events - AWT
event hierarchy - Introduction to Swing – layout management - Swing Components – Text Fields , Text
Areas – Buttons- Check Boxes – Radio Buttons – Lists- choices- Scrollbars – Windows –Menus – Dialog
Boxes.
PART – A
BT
Q.No. Question Competence
Level
List the situation in which an action event and item event is
1 BTL1 Remembering
generated?
Name the Listener methods that must be implemented for the
2 BTL1 Remembering
KeyListener interface
3 What are the steps needed to show a Frame BTL1 Remembering
4 Define JPanel object BTL1 Remembering
5 Mention any four event names of a button component BTL1 Remembering
6 What is meant by window adapter classes BTL1 Remembering

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7 Write syntax of drawimage() and copyArea() methods BTL2 Understanding

8 Write syntax to handle two mouse events BTL2 Understanding
9 Describe AWT in Java BTL2 Understanding
10 Summarize the function of (a) Set Layout and (b) Flow Layout BTL2 Understanding
11 How are frames created in Java BTL3 Applying
12 How do you manage the color and font of a graphics in applet BTL3 Applying
Show the value for the following predefined actions.
13 a.SMALL-ICON BTL3 Applying
b.MNEMONIC-KEY
14 Distinguish swing and AWT BTL4 Analyzing
15 Explain four swing components with proper syntax BTL4 Analyzing
16 Differentiate GridBagLayout from GridLayout BTL4 Analyzing
17 Evaluate the relationship between event sources and listeners BTL5 Evaluating
18 Assess the methods under WindowListener Interface BTL5 Evaluating
19 Create the simple program that displays an empty frame on the screen BTL6 Creating
Code the Graphics method in java to draw the String “ Hello World”
20 BTL6 Creating
from the coordinates(100,200)
PART – B
i. What is layout management? What is the function of Layout
1 manager? (7) BTL1 Remembering
ii. What is the process of setting the layout manager(6)
2 Write a program to include the Internal Frame in Swing BTL1 Remembering

3 List the methods available to draw shapes and COLOR BTL1 Remembering
4 State and Explain the basic of AWT Event handling in detail BTL1 Remembering
Describe in detail about the different layout in Java GUI. Which
5 BTL2 Understanding
layout is the default one?
Summarize the following in detail: Model, view and controller design
6 pattern with respect to Swing in Java. How MVC design pattern is BTL2 Understanding
achieved?
Discuss mouse listener and mouse motion listener. Give an example
7 BTL2 Understanding
program
Demonstrate the Characteristics of model view Controller design
8 BTL3 Applying
patterns and its advantages
9 Illustrate the usage of special fonts for text in graphics programming BTL3 Applying
i. Clasify the classes under 2D shapes (7)
10 BTL4 Analyzing
ii. Explain the Swing components in detail(6)
i. Infer JList and JComboBox with an example(7)
11 BTL4 Analyzing
ii. Compare check boxes and radio buttons with an example(6)

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i. Describe the AWT event hierarchy(6)

12 BTL4 Analyzing
ii. Discuss the adapter classes using example(7)
i. Recommend when should we use an event adapter class (7)
13 ii. Assess what are the different components that are used to show a BTL5 Evaluating
container (6)
14 Write a program for a simple calculator using swing BTL6 Creating
PART – C
i. Write a program to use setBounds() method.(8)
1 ii. Create a program use of BorderLayout (7) BTL6 Creating
Which method do you use to enable and disable components such as
2 JButtons? What class is it defined in? BTL5 Evaluating
i. Which Swing components use ListSelectionModel? [Hint: The
“Use” link at the top of the specification for each interface and
class takes you to a page showing where in the API that interface
3 or class is referenced.] (8) BTL5 Evaluating
ii. Do those components use any other models to handle other aspects
of the components’ state? If so, list the other models’ types (6)
Code a java program to implement the following: Create four check
boxes. The initial stateof the first box should be in checked state.The
4 status of each check box should be displayed. when we change the BTL6 Creating
state of acheck box, the status should be display is updated

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