PROGRAMING IN JAVA 4TH SEM DIGVIJAY COLLAGE

PROGRAMMING IN JAVA 2023-24
YASHWANT KUMAR TANDEKAR (BCA 4 th
SEM) Page 1
Q.1 WAP to implement the concept of Encapsulation.
CODING :-
import java.util.*;
import java.io.*;
class Person
{
private String name ;
private int age;
public String getName()
{
return name;
}
public void setName(String name) //Setter Method
{
this.name = name;
}
public int getAge()
{
return age;
}
public void setAge(int age)
{
this.age = age;
}
}
public class Pmain
{

SEM) Page 2
public static void main(String args[]) // main function
{
Person p = new Person();
p.setName("Yash Tandekar");
p.setAge(21);
System.out.println("Name : " + p.getName() );
System.out.println("Age : " + p.getAge() );
}
}
OUTPUT :-
PTO

SEM) Page 3
Q.2 WAP for Boolean Data type and print the Prime number series upto 50.
CODING :-
import java.util.*;
import java.io.*;
public class PrimeNumber
{
public static boolean isPrime(int num)
{
if (num <= 1)
{
return false;
}
for (int i = 2; i * i <= num; i++)
{
if (num % i == 0)
{
return false;
}
}
return true;
}
public static void main(String args[])
{
System.out.println("Prime numbers up to 50:");
for (int i = 2; i <= 50; i++)
{

SEM) Page 4
if (isPrime(i))
{
System.out.print(i + " ");
}
}
}
}
OUTPUT :-
P.T.O.

SEM) Page 5
Q.3 Write a program to demonstrate Method Overloading in java.
CODING :-
import java.util.*;
import java.io.*;
public class Sum
{
public int sum(int x, int y)
{
return (x + y);
}
public int sum(int x, int y, int z)
{
return (x + y + z);
}
public double sum(double x, double y)
{
return (x + y);
}
{
Sum s = new Sum();
System.out.println(" METHOD OVERLOADING ");
System.out.println(" -: Inside First Sum Block :-");
System.out.println("t" +s.sum(10, 20));

SEM) Page 6
System.out.println(" n-: Inside Second Sum Block :-");
System.out.println("t" +s.sum(10, 20, 30));
System.out.println(" n-: Inside Third Sum Block :-");
System.out.println("t" +s.sum(10.5, 20.5));
}
}
OUTPUT :-
P.T.O.

SEM) Page 7
Q.4 WAP for Multiplication of Matrix using input/output string.
CODING :-
import java.util.Scanner;
import java.io.*;
public class UserInputMatrixMultiplication
{
public static void main(String[] args)
{
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the number of rows for the first matrix: ");
int rows1 = scanner.nextInt();
System.out.print("Enter the number of columns for the first matrix: ");
int cols1 = scanner.nextInt();
System.out.print("Enter the number of rows for the second matrix: ");
int rows2 = scanner.nextInt();
System.out.print("Enter the number of columns for the second matrix: ");
int cols2 = scanner.nextInt();
if (cols1 != rows2)
{
System.err.println("Error: Number of columns in first matrix must equal
number of rows in second matrix for multiplication.");
return;
}
int[][] matrix1 = new int[rows1][cols1];
int[][] matrix2 = new int[rows2][cols2];

SEM) Page 8
// Get elements of first matrix
System.out.println("Enter elements for the first matrix (row-wise):");
for (int i = 0; i < rows1; i++)
{
for (int j = 0; j < cols1; j++)
{
System.out.print("Enter element [" + (i + 1) + "][" + (j + 1) + "]: ");
matrix1[i][j] = scanner.nextInt();
}
}
// Get elements of second matrix
System.out.println("Enter elements for the second matrix (row-wise):");
{
{
System.out.print("Enter element [" + (i + 1) + "][" + (j + 1) + "]: ");
matrix2[i][j] = scanner.nextInt();
}
}
// Create a result matrix to store the product
int[][] result = new int[rows1][cols2];
// Perform matrix multiplication

SEM) Page 9
{
{
result[i][j] = 0;
for (int k = 0; k < cols1; k++)
{
result[i][j] += matrix1[i][k] * matrix2[k][j];
}
}
}
// Print the result matrix
System.out.println("Result Matrix:");
{
{
System.out.print(result[i][j] + " ");
}
System.out.println();
}
scanner.close();
}
}
P.T.O.

SEM) Page 10
OUTPUT :-
P.T.O.

SEM) Page 11
Q.5 WAP for String Buffer class which perform the all methods of that
class.
CODING :-
import java.util.*;
import java.io.*;
import java.lang.StringBuffer;
public class StringBufferAndString
{
{
String s = "Yash";
System.out.println("String = "+s);
StringBuffer sb = new StringBuffer("Yash”);
sb.append("Tandekar");
System.out.println("append() method = "+sb);
sb.insert(0,"BCA");
System.out.println("insert() method = "+sb);
sb.replace(1,3,"---");
System.out.println("replace() method = "+sb);
sb.delete(1,3);
System.out.println("delete() method = "+sb);
sb.reverse();
System.out.println("reverse() method = "+sb);
}
}
PTO

SEM) Page 12
OUTPUT :-
P.T.O.

SEM) Page 13
Q.6 WAP to perform autoboxing and unboxing in Wrapper class.
CODING :-
import java.util.*;
import java.io.*;
class AUboxing
{
{
Character gfg = 'a';
char ch = gfg;
System.out.println("-: Autoboxing of character :-n");
System.out.println("Value of ch: " + ch);
System.out.println(" -: Unboxing of Character :-n");
System.out.println(" Value of gfg: " + gfg);
}
}
OUTPUT :-
P.T.O.

SEM) Page 14
Q.7 WAP to calculate Area of various geometrical figures using the
abstract class.
CODING :-
import java.math.BigDecimal;
import java.util.*;
import java.io.*;
abstract class Shape
{
public abstract BigDecimal calculateArea();
}
class Square extends Shape
{
private final BigDecimal side;
public Square(BigDecimal side)
{
this.side = side;
}
public BigDecimal calculateArea()
{
return side.multiply(side);
}
}
class Rectangle extends Shape
{

SEM) Page 15
private final BigDecimal length;
private final BigDecimal breadth;
public Rectangle(BigDecimal length, BigDecimal breadth)
{
this.length = length;
this.breadth = breadth;
}
{
return length.multiply(breadth);
}
}
class Circle extends Shape
{
private final BigDecimal radius;
public Circle(BigDecimal radius)
{
this.radius = radius;
}
{
BigDecimal pi = new BigDecimal("3.14159");
return pi.multiply(radius.multiply(radius));

SEM) Page 16
}
}
public class AreaCalculator
{
{
Shape square = new Square(new BigDecimal(5));
Shape rectangle = new Rectangle(new BigDecimal(4), new BigDecimal(6));
Shape circle = new Circle(new BigDecimal(3));
System.out.println(" -: Abstract Method Used Here :-n");
System.out.println("Area of Square is - " + square.calculateArea());
System.out.println("nArea of Rectangle is - " + rectangle.calculateArea());
System.out.println("nArea of Circle is: " + circle.calculateArea());
}
}
OUTPUT :-

SEM) Page 17
Q.8 Write a program where single class implements the more than one
interface and with the help of interface reference variable user call the
method.
CODING :-
import java.util.*;
import java.io.*;
interface Drawable
{
void draw();
}
interface Speakable
{
void speak();
}
class Animal implements Drawable, Speakable
Drawable and Speakable interfaces
{
public void draw()
{
System.out.println("Drawing a animal...");
}
public void speak()
{
System.out.println("Animal sound (as they Speak)");
}
}

SEM) Page 18
public class InterfaceUsage //Main Class
{
public static void main(String args[]) //Main Method
{
Animal a = new Animal();
Drawable dA = a;// Use interface reference variables to call specific methods
dA.draw();
Speakable spA = a;
spA.speak(); }
}
OUTPUT :-

SEM) Page 19
Q.9 WAP to create a package using command and one package will
import the another package.
CODING :-
 Package 1 yash :
package yash;
public class Sum
{
public static int add(int a, int b)
{
return a + b;
}
}
 Package 2 : another
import java.util.*;
import java.io.*;
package another;
import yash.Sum; // Import the Sum class of yash package
public class Add
{
{
int sum = Sum.add(5, 3);
System.out.println("Sum of 5 and 3 is: " + sum);
}
}
OUTPUT :-
P.T.O.

SEM) Page 20
Q.10 WAP that use multiple catch statements within the try-catch
mechanism.
CODING :-
import java.util.*;
import java.io.*;
public class MultipleCatchExp
{
{
int num = 10;
String str = null;
System.out.println("Num = " +num);
try
{
int result = num / 0;
int strLength = str.length();
}
catch (ArithmeticException e)
{
System.out.println("Caught ArithmeticException: Division by zero");
}
catch (NullPointerException e)
{
System.out.println("Caught NullPointerException: Accessing null
object");
}
finally

SEM) Page 21
{
System.out.println("Catch block always executes");
}
System.out.println("Program continues after try-catch block");
}
}
OUTPUT :-
P.T.O.

SEM) Page 22
Q.11 WAP where user will create a self-Exception using the “throw”
keyword.
CODING :-
import java.util.*;
import java.io.*;
public class SelfException
{
public static void validateAge(int age) throws AgeException
{
if (age < 18)
{
throw new AgeException(".......Age must be 18 or older.......");
}
System.out.println("Age is valid: " + age);
}
{
System.out.print("Enter your age: ");
int userAge = scanner.nextInt();
try
{
validateAge(userAge);
}
catch (AgeException e)
{

SEM) Page 23
System.out.println("Caught AgeException : " + e.getMessage());
}
}
}
class AgeException extends Exception
{
public AgeException(String message)
{
super(message);
}
}
OUTPUT :-
P.T.O.

SEM) Page 24
Q.12 WAP to demonstrate Multilevel Inheritance in java.
CODING :-
import java.util.*;
import java.io.*;
class Vehicle
{
public void move()
{
System.out.println("Vehicle is moving.");
}
}
class Car extends Vehicle
{
public void openDoors()
{
System.out.println("Car doors are open.");
}
}
class SportsCar extends Car
{
public void accelerate()
{
System.out.println("Sports car is accelerating!");
}
}

SEM) Page 25
public class MultilevelExp //main Class
{
{
SportsCar SC = new SportsCar();
System.out.println(" .....-: Multi Level inheritance Used Here :-.....n");
SC.move(); // Inherited from Vehicle
SC.openDoors(); // Inherited from Car
SC.accelerate(); // Specific to SportsCar
}
}
OUTPUT :-
P.T.O.

SEM) Page 26
Q.13 WAP for Vector class which perform the all methods of that
class.
CODING :-
import java.io.*;
import java.util.Vector;
public class VectorExp
{
{
Vector<String> fruits = new Vector<>(5);
System.out.println("......Using add() Method......n");
fruits.add("Apple");
fruits.add("Banana");
fruits.add("Orange");
System.out.println(" Vector after adding elements - " + fruits);
fruits.add(1, "Mango");
System.out.println(" Vector after adding element at index 1 - " + fruits);
System.out.println("n......Using remove() Method......n");
fruits.remove(0);
System.out.println(" Vector after removing element at index 0 - " + fruits);
fruits.removeElement("Orange");
System.out.println("Vector after removing element 'Orange': " + fruits);

SEM) Page 27
System.out.println("n......Using size() Method......n");
int vectorSize = fruits.size();
System.out.println("Vector size: " + vectorSize);
System.out.println("n......Using clear() Method......n");
fruits.clear();
System.out.println("Vector after clearing all elements: " + fruits);
}
}
OUTPUT :-

SEM) Page 28
Q.14 WAP to create a simple class to find out the area and perimeter
of rectangle using super and this keyword.
CODING :-
import java.util.*;
import java.io.*;
public class Rectangle
{
private double length;
private double width;
public Rectangle(double length, double width)
{
this.length = length;
this.width = width;
}
public double calculateArea()
{
return length * width;
}
public double calculatePerimeter()
{
return 2 * (length + width);
}
public static void main(String[] args) // Main method
{
Rectangle rectangle = new Rectangle(5.0, 3.0);

SEM) Page 29
double area = rectangle.calculateArea();
double perimeter = rectangle.calculatePerimeter();
System.out.println("Area of rectangle: " + area);
System.out.println("Perimeter of rectangle: " + perimeter);
}
}
OUTPUT :-
P.T.O

SEM) Page 30
Q.15 WAP for Applet that handle the keyboard Events.
CODING :-
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
/* <APPLET CODE ="AppletKeyboard.class" WIDTH=300 HEIGHT=200>
</APPLET> */
public class AppletKeyboard extends Applet implements KeyListener
{
TextField t,tt,tp,tr;
public void init()
{
t=new TextField(20);
t.addKeyListener(this);
tt=new TextField(70);
tp=new TextField(70);
tr=new TextField(70);
add(t);
add(tt);
add(tr);
add(tp);
}
public void keyTyped(KeyEvent e)
{
tt.setText("key Released"+e.getKeyChar());
}
public void keyReleased(KeyEvent e)
{

SEM) Page 31
tr.setText("key Released"+e.getKeyChar());
}
public void keyPressed(KeyEvent e)
{
int kc;
String s;
kc=e.getKeyCode();
s=e.getKeyText(kc);
tp.setText("Key Pressed"+s);
}
}
OUTPUT :-
P.T.O.

SEM) Page 32
Q.16 WAP to illustrate the use of all methods of URL class.
CODING :-
import java.util.*;
import java.net.*;
public class URLDemo
{
{
try{
URL url=new
URL("https://www.google.com/search?q=javatpoint&oq=javatpoint&sourceid=chro
me&ie=UTF-8");
System.out.println("Protocol: "+url.getProtocol());
System.out.println("Host Name: "+url.getHost());
System.out.println("Port Number: "+url.getPort());
System.out.println("Default Port Number: "+url.getDefaultPort());
System.out.println("Path: "+url.getPath());
System.out.println("File: "+url.getFile());
}catch(Exception e){System.out.println(e);}
}
}
OUTPUT :-

SEM) Page 33
Q.17 WAP for AWT to create Menu and Popup Menu for Frame.
CODING :-
import java.awt.*;
import java.util.*;
import java.io.*;
public class MenuAndPopupMenuExample extends Frame implements
ActionListener
{
private MenuBar menuBar;
private Menu fileMenu, editMenu;
private PopupMenu popupMenu;
public MenuAndPopupMenuExample()
{
super("Menu and Popup Menu Example");
menuBar = new MenuBar(); // Create MenuBar and Menus
fileMenu = new Menu("File");
editMenu = new Menu("Edit");
menuBar.add(fileMenu);
menuBar.add(editMenu);
// Add Menu Items to File Menu
MenuItem newMenuItem = new MenuItem("New");
newMenuItem.addActionListener(this);
fileMenu.add(newMenuItem);
MenuItem openMenuItem = new MenuItem("Open");
openMenuItem.addActionListener(this);
fileMenu.add(openMenuItem);

SEM) Page 34
fileMenu.addSeparator(); // Add separator line
MenuItem exitMenuItem = new MenuItem("Exit");
exitMenuItem.addActionListener(this);
fileMenu.add(exitMenuItem);
popupMenu = new PopupMenu(); // Create Popup Menu
MenuItem copyMenuItem = new MenuItem("Copy");
copyMenuItem.addActionListener(this);
popupMenu.add(copyMenuItem);
MenuItem pasteMenuItem = new MenuItem("Paste");
pasteMenuItem.addActionListener(this);
popupMenu.add(pasteMenuItem);
setMenuBar(menuBar);
setSize(400, 300);
setLayout(null);
setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
String action = e.getActionCommand();
System.out.println("Menu Item Selected: " + action);
}
{

SEM) Page 35
new MenuAndPopupMenuExample();
}
}
OUTPUT :-
P.T.O.

SEM) Page 36
Q.18 WAP to demonstrate the Border Layout using applet.
CODING :-
import javax.swing.*; //Importing packages
import java.awt.*;
import java.util.*;
import java.io.*;
public class BorderLayoutDemo extends JFrame
{
public BorderLayoutDemo()
{
super("Border Layout Demo");
// Create components for each region
JButton northButton = new JButton("North");
JButton southButton = new JButton("South");
JButton eastButton = new JButton("East");
JButton westButton = new JButton("West");
JPanel centerPanel = new JPanel();
centerPanel.setBackground(Color.LIGHT_GRAY);
JLabel centerLabel = new JLabel("Center");
centerPanel.add(centerLabel);
setLayout(new BorderLayout()); // Set the layout manager
add(northButton, BorderLayout.NORTH);
add(southButton, BorderLayout.SOUTH);

SEM) Page 37
add(eastButton, BorderLayout.EAST);
add(westButton, BorderLayout.WEST);
add(centerPanel, BorderLayout.CENTER);
setSize(400, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String[] args) //Main Function
{
new BorderLayoutDemo();
}
}
OUTPUT :-
P.T.O.

SEM) Page 38
Q.19 WAP to check the given string is Palindrome or not?
CODING :-
import java.util.*;
import java.io.*;
public class PalindromeC
{
public static boolean isPalindrome(String str)
{
if (str == null || str.length() <= 1)
{
return true;
}
str = str.toLowerCase();
int left = 0;
int right = str.length() - 1;
while (left < right)
{
if (str.charAt(left) != str.charAt(right))
{
return false;
}
left++;
right--;
}
return true;
}

SEM) Page 39
{
System.out.print("Enter your name: ");
String name = scanner.nextLine();
boolean isPalindrome = isPalindrome(name);
if (isPalindrome)
{
System.out.println(name + " is a palindrome.");
}
else
{
System.out.println(name + " is not a palindrome.");
}
}
}
OUTPUT :-
P.T.O.

SEM) Page 40
Q.20 WAP for applet who generate the mousemotionlistener event
Code.
CODING :-
import java.util.*; //Importing packages
import java.io.*;
import java.awt.*;
public class MouseMotionEg extends Frame implements MouseMotionListener
{
MouseMotionEg() //Constructor Used here
{
addMouseMotionListener(this); //Method
setSize(200,200);
setLayout(null);
setVisible(true);
}
public void mouseDragged(MouseEvent e)
{
Graphics g=getGraphics();
g.setColor(Color.BLACK);
g.fillOval(e.getX(),e.getY(),20,20);
}
public void mouseMoved(MouseEvent e)
{
}
public static void main(String args[]) //Main Function

SEM) Page 41
{
new MouseMotionEg();
}
}
OUTPUT :-

PROGRAMING IN JAVA 4TH SEM DIGVIJAY COLLAGE

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