A simple Java program to find the inverse of a given matrix

 import java.util.Scanner;

public class MatrixInverse { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int n = 2; double[][] matrix = new double[n][n]; double[][] inverse = new double[n][n]; System.out.println("Enter elements of 2x2 matrix:"); for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) { matrix[i][j] = scanner.nextDouble(); } } double det = determinant(matrix); if (det == 0) { System.out.println("Matrix is singular, can't find its inverse."); } else { inverse(matrix, inverse, det); System.out.println("Inverse of the matrix is:"); for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) { System.out.print(inverse[i][j] + " "); } System.out.println(); } } } public static double determinant(double[][] matrix) { return (matrix[0][0] * matrix[1][1]) - (matrix[0][1] * matrix[1][0]); } public static void inverse(double[][] matrix, double[][] inverse, double det) { inverse[0][0] = matrix[1][1] / det; inverse[0][1] = -matrix[0][1] / det; inverse[1][0] = -matrix[1][0] / det; inverse[1][1] = matrix[0][0] / det; } }

A.Y. 2024-25 Data Mining (Computer Science and Engineering)

Student's Lecture Notes for University Examinations for quick reference.

Regulation: R18 

Subject: Data Mining  Syllabus

Descriptive Question Bank

Objective Question Bank

 

Unit-1 : 

Introduction to Data Mining Notes Click Here

Data Preprocessing  Hand Written Note Click Here

Data Mining Unit-1 Important Question and Answers Click Here

Unit-1 ppt Click Here

Unit-2: 

Notes Click Here

Unit-1 ppt Part-1 Click Here

 Unit-2 ppt Part-2 Click Here

FP-Growth ppt Click Here

Question and Answers Click Here

Unit-3

Notes: Click Here

Classification and Prediction ppt Click Here

Decision tree Classification ppt Click Here

Lazy Learner and Rule Based Classification ppt Click Here

Question and Answers Click Here

Unit-4 

Notes: Click Here

Clustering and its Applications- Hierarchical Clustering ppt Click Here

Density Based Clustering ppt Click Here

Partitioning Clustering ppt Click Here

Question and Answers Click Here

Unit-5

unit-5 ppts:  Click Here

Time Series Mining and Sequential Pattern Mining ppt Click Here

Spatial Data Mining ppt Click Here

Text Mining  Click Here

Multimedia Data Mining  Click Here

Question and Answers Click Here

x

Python Programming

 

JNTUH Python Programming(Common to EEE, Mechanical, Civil) Syllabus: PDF

Question bank: Download

Unit-1 Material Find Here

 

Material : Download HERE

 

Handwritten Notes: Click Here

 

PPT: Find Here

Unit-2 Material Find Here

Material : Download HERE

 

PPT: Find Here

Unit-3 Material Find Here

Material : Download HERE

 

PPT: Find Here

Unit-4 Material Find Here

Material : Download HERE

 

PPT: Find Here

Unit-5 Material Find Here

Material : Download HERE

PPT: Find  Here

Write a Java program that simulates a traffic light. The program lets the user select one of three lights: red, yellow, or green with radio buttons. On selecting a button, an appropriate message with “Stop” or “Ready” or “Go” should appear above the buttons in selected color. Initially, there is no message shown.

 import java.awt.Color;

import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.*;

class App extends JFrame implements ItemListener{
	JFrame actualWindow;
	JPanel messageContainer, lightsContainer;
	JLabel message;
	ButtonGroup btn_group;
	JRadioButton rb_red, rb_yellow, rb_green;
	
	App() {
		Font myFont = new Font("Verdana",Font.BOLD, 50);
		actualWindow = new JFrame("Traffic Lights");
		messageContainer = new JPanel();
		lightsContainer = new JPanel();
		message = new JLabel("");
		btn_group = new ButtonGroup();
		rb_red = new JRadioButton("Red");
		rb_yellow = new JRadioButton("Yellow");
		rb_green = new JRadioButton("Green");
		
		actualWindow.setLayout(new GridLayout(2, 1));
		
		message.setFont(myFont);
		rb_red.setForeground(Color.RED);
		rb_yellow.setForeground(Color.YELLOW);
		rb_green.setForeground(Color.GREEN);
		
		btn_group.add(rb_red);
		btn_group.add(rb_yellow);
		btn_group.add(rb_green);
		
		rb_red.addItemListener(this);
		rb_yellow.addItemListener(this);
		rb_green.addItemListener(this);
		
		messageContainer.add(message);
		lightsContainer.add(rb_red);
		lightsContainer.add(rb_yellow);
		lightsContainer.add(rb_green);
		
		actualWindow.add(messageContainer);
		actualWindow.add(lightsContainer);
				
		actualWindow.setSize(300, 200);
		actualWindow.setVisible(true);
	}

	@Override
	public void itemStateChanged(ItemEvent ie) {
		JRadioButton selected = (JRadioButton) ie.getSource();
		String textOnButton = selected.getText();
		if(textOnButton.equals("Red")) {
			message.setForeground(Color.RED);
			message.setText("STOP");
		} else if(textOnButton.equals("Yellow")) {
			message.setForeground(Color.YELLOW);
			message.setText("READY");
		} else {
			message.setForeground(Color.GREEN);
			message.setText("GO");
		}
	}
}
public class TrafficLight {
	public static void main(String[] args) {
		new App();
	}
}

Write a Java program that handles all mouse events and shows the event name at the center of the window when a mouse event is fired .

Program Code:

import javax.swing.event.*;

import java.awt.event.*;

import java.awt.*;

import javax.swing.JApplet;

public class mouseevnts extends JApplet implements MouseListener

{

private int x,y;

private String event;

public void init()

{

setLayout(new FlowLayout());

x=-1;

addMouseListener(this);

}

public void paint(Graphics g)

{

super.paint(g);

g.drawRect(0,0,getWidth(),getHeight());

if(x!=1)

{

g.drawString("Mouseevent is"+event+"("+x+","+y+")", 10,50);

}

}

public void mousePressed(MouseEvent e)

{

x=e.getX();

y=e.getY();

event="pressed";

repaint();

}

public void mouseClicked(MouseEvent e)

{

x=e.getX();

y=e.getY();

event="clicked";

repaint();

}

public void mouseReleased(MouseEvent e)

{

x=e.getX();

y=e.getY();

event="Reeleased";

repaint();

}

public void mouseExited(MouseEvent e)

{

x=e.getX();

y=e.getY();

event="Exited";

repaint();

}

public void mouseEntered(MouseEvent e)

{

x=e.getX();

y=e.getY();

event="Entered";

repaint();

}

}

3. a) Develop an applet in Java that displays a simple message. b) Develop an applet in Java that receives an integer in one text field, and computes its factorial Value and returns it in another text field, when the button named “Compute” is clicked.

 a)      Develop an applet in Java that displays a simple message.

Program:

import java.awt.*;

import java.applet.Applet;

/* <applet code="SimpleApplet" width=300 height=50> </applet> */

public class SimpleApplet extends Applet

{

 public void paint(Graphics g)

 {

 g.drawString ("A Simple Applet",100, 100);

 }

}

 

Execution:

C:\Users\vits\Desktop\java> javac  SimpleApplet.java

 

C:\Users\vits\Desktop\java>appletviewer  SimpleApplet.java

 

Output:

 

 

b)      Develop an applet in Java that receives an integer in one text field, and computes its factorial Value and returns it in another text field, when the button named “Compute” is clicked.

Program:

import java.awt.*;

import java.awt.event.*;

import java.applet.Applet;

/* <applet code="Fact" width=300 height=50> </applet> */

public class Fact extends Applet implements ActionListener

{

Label l1,l2; TextField t1,t2; Button b1;

public void init(){

l1=new Label("enter the value"); add(l1);

t1=new TextField(10); add(t1);

b1=new Button("Factorial"); add(b1); b1.addActionListener(this);

l2=new Label("Factorial of given no is"); add(l2);

t2=new TextField(10); add(t2);

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==b1)

{

int fact=fact(Integer.parseInt(t1.getText())); t2.setText(String.valueOf(fact));

}

}

int  fact(int f)

{

int  s=0;

if(f==0)

 return 1;

else

return  f*fact(f-1);

}

}

 

Execution:

C:\Users\vits\Desktop\java>javac   Fact.java

 

C:\Users\vits\Desktop\java>appletviewer   Fact.java

 

Output: