QP CODE: 22100311

B.Sc DEGREE (CBCS ) REGULAR / REAPPEARANCE

EXAMINATIONS,JANUARY 2022
Fifth Semester
CORE COURSE - CS5CRT14 - JAVA PROGRAMMING USING LINUX
Part A
Answer any 10 questions.
Each question carries 2 marks.

1. Differentiate between object oriented and procedure oriented programming.

Procedural Programming:based upon the concept of calling procedure. Procedures, also known
as routines, subroutines or functions, simply consist of a series of computational steps to be
carried out. During a program’s execution, any given procedure might be called at any point,
including by other procedures or itself.
Object Oriented Programming: can be defined as a programming model which is based upon
the concept of objects. Objects contain data in the form of attributes and code in the form of
methods. In object oriented programming, computer programs are designed using the concept
of objects that interact with real world. Object oriented programming languages are various but
the most popular ones are class-based, meaning that objects are instances of classes, which also
determine their types.
2. Explain the use of continue statement.
The continue statement passes control to the next iteration of the nearest enclosing do , for ,
or while statement in which it appears, bypassing any remaining statements in the do , for ,
or while statement body.
3. Define classes and objects.
Class is a user-defined datatype that has its own data members and member functions whereas
an object is an instance of class by which we can access the data members and member
functions of the class.
4. What are constructors?
A constructor in Java is a special method that is used to initialize objects. The constructor is
called when an object of a class is created. A constructor has the same name as that of the
class and does not have any return type.
5. What is the use of protected keyword in java?
Protected keyword in Java refers to one of its access modifiers. The methods or data members
declared as protected can be accessed from:
Within the same class.
Subclasses of same packages.
Different classes of same packages.
Subclasses of different packages.
6. What is two dimensional array?
A 2D array is an array of one-dimensional arrays. In Java, a two-dimensional array is stored
in the form of rows and columns and is represented in the form of a matrix.
7. What is nested try statement?
A try-catch-finally block can reside inside another try-catch-finally block that is known as
nested try statement in Java.When you have nested try statements in your code, in case an
exception is thrown the inner most try-catch block gets the first chance to handle that
exception, if that try-catch block can not handle the exception, the exception goes up the
hierarchy (next try-catch block in the stack) and the next try statement's catch block handlers
are inspected for a match. If no catch block, with in the hierarchy, handles the thrown
exception then the Java run-time system will handle the exception.
 8. Why swing component are called lightweight components?
Swing is considered lightweight because it is fully implemented in Java, without calling the
native operating system for drawing the graphical user interface components.
9. Define Window Event Class
The object of this class represents the change in state of a window. This event is generated by
a Window object when it is opened, closed, activated, deactivated, iconified, or deiconified,
or when focus is transferred into or out of the Window.
10. Diffrentiate between swing and Jpanel.
JPanel is a lightweight container generally used to organize Graphic user interface
components. JPanels are added on top of JFrame. It inherits the JComponents class of Swing.
Swing are used to develop window-based applications in Java. The javax.swing API provides
all the component classes like JButton, JTextField, JCheckbox, JMenu, etc. The components
of Swing are platform-independent.
11. Distinguish between init() and distroy() methods in applet.
The init() method is the first method to run that initializes the applet. It can be invoked only
once at the time of initialization. The web browser creates the initialized objects, i.e., the web
browser (after checking the security settings) runs the init() method within the applet.
The destroy() method destroys the applet after its work is done. It is invoked when the applet
window is closed or when the tab containing the webpage is closed. It removes the applet
object from memory and is executed only once. We cannot start the applet once it is destroyed.
12. How parameters can be passed to applet using tag?
Parameters are passed to applets in NAME=VALUE pairs in <PARAM> tags between the
opening and closing APPLET tags. Inside the applet, we can read the values passed through
the PARAM tags with the getParameter() method of the java. applet. Applet class.
Part B
Answer any 6 questions.
Each question carries 5 marks.
13. Explain the characterset of Java Program
The character set is a set of alphabets, letters and some special characters that are valid in
Java language.The smallest unit of Java language is the characters need to write java tokens.
These character set are defined by Unicode character set.Explain each.
14. Write a Java program to find the smallest among 3 numbers
public class Smallest {
public static void main(String[] args) {
int a = 20;
int b = 10;
int c = 30;
int smallest;
if(a<b) {
if(c<a) { smallest = c; }
else { smallest = a; }
}
else { if(b<c) { smallest = b; }
else { smallest = c; }
}
System.out.println(smallest + " is the smallest.");
}
}
15. Explain method overloading with example
Overloading allows different methods to have the same name, but different signatures where
the signature can differ by the number of input parameters or type of input parameters or both..
(Explanation with its syntax and a suitable example )
 16. How will you implement hierarchical inheritance in Java?
In Hierarchical Inheritance, the multiple child classes inherit the single class or the single class
is inherited by multiple child class. Syntax of Hierarchical Inheritance in Java:
class Subclassname1 extends Superclassname
{
// variables and methods
}
class Subclassname2 extends Superclassname
{
// variables and methods
}
Explanation with an example program.
17. Explain about user defined packages.
User-defined packages are those packages that are designed or created by the developer to
categorize classes and packages. It can be imported into other classes and used the same as
we use built-in packages. Give a simple example with explanation.
18. Write a Java program to demonstrate thread priorities.
public class A implements Runnable
{
public void run()
{
System.out.println(Thread.currentThread());
}
public static void main(String[] args)
{
A a = new A();
Thread t = new Thread(a, "NewThread");
System.out.println("Priority of Thread: " +t.getPriority());
System.out.println("Name of Thread: " +t.getName());
t.start();
}
}
(Any program which demonstrate thread priorities)
19. Develop a simple program to implement KeyEvent class.
import java.awt.*;
import java.awt.event.*;
public class KeyListenerExample extends Frame implements KeyListener {
Label l;
TextArea area;
KeyListenerExample() {
l = new Label();
l.setBounds (20, 50, 100, 20);
area = new TextArea();
area.setBounds (20, 80, 300, 300);
area.addKeyListener(this);
add(l);
add(area);
setSize (400, 400);
setLayout (null);
setVisible (true);
}
public void keyPressed (KeyEvent e) {
 l.setText ("Key Pressed");
}
public void keyReleased (KeyEvent e) {
l.setText ("Key Released");
}
public void keyTyped (KeyEvent e) {
l.setText ("Key Typed");
}
public static void main(String[] args) {
new KeyListenerExample();
}
}
(Any program which implement KeyEvent class.)
20. Write an applet that receives three numeric values as input from the user and display the
largest.
importjava.applet.*;
importjava.awt.*;
importjava.awt.event.*;
public class largenumber extends Applet implements ActionListener
{
TextField t1,t2,t3,t4;
Button b1;
public void init()
{
setLayout(null);
t1 = new TextField(15);
t1.setBounds(100,25,50,20);
t2 = new TextField(15);
t2.setBounds(100,50,50,20);
t3 = new TextField(15);
t3.setBounds(100,75,50,20);
t4 = new TextField("Ans");
t4.setBounds(175,40,50,20);
b1 = new Button("Find");
b1.setBounds(175,65,50,30);
add(t1);
add(t2);
add(t3);
add(t4);
add(b1);
b1.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
inti,j,k;
i = Integer.parseInt(t1.getText());
j=Integer.parseInt(t2.getText());
k=Integer.parseInt(t3.getText());
if(i<j)
{
if(j<k)
t4.setText(""+k);
 else
t4.setText(""+j);
}
else
t4.setText(""+i);
}
}
21. What are JDBC statements?
Statement : Used to implement simple SQL statements with no parameters.
PreparedStatement : (Extends Statement .) Used for precompiling SQL statements that might
contain input parameters. ...
CallableStatement: (Extends PreparedStatement .)
Explain with a suitable example.
Part C
Answer any two questions.
Each question carries 15 marks.
22. Illustrate the use of different operators in Java.
Unary Operator, Arithmetic Operator, Shift Operator, Relational Operator, Bitwise operator,
Logical Operator, Ternary Operator and Assignment Operator. Explain each and give an
example program to illustrate all the operators.
23. Differentiate final methods and final classes with examples.
If a class its final, it can't be subclassed. If a method its final it can't be overriden by any
subclass. Explain each with suitable examples.
24. a)Differentiate between one-dimensional , two-dimensional arrays with appropriate syntax
& examples b)Write a Java program to sort numbers & sort names in 2 different arrays.
A 1D array is a simple data structure that stores a collection of similar type data in a
contiguous block of memory while the 2D array is a type of array that stores multiple data
elements of the same type in matrix or table like format with a number of rows and columns.
Thus, this is the main difference between 1D and 2D array. The syntax for 1D array is, data-
type[] name = new data-type[size]; while the syntax for 2D array is, data-type[][] name = new
data-type[rows][columns]; Give suitable examples.(8)
A Java program to sort numbers & sort names in 2 different arrays.(7)
25. What is Layout manager? Explain any three layout managers in which method is used to set the
layout manager.
The Layout Managers are used to arrange components in a particular manner. The Java Layout
Managers facilitates us to control the positioning and size of the components in GUI forms.
Flow Layout, Grid Layout, Card Layout, Border Layout, Box Layout, Null Layout
Explain any of the three with example.