uk22

mport java.util.Scanner;
abstract class Shape {
int length, width;
// Copy code
public Shape(int length, int width) {
this.length = length;
this.width = width;
}
abstract void printArea();
}
class Rectangle extends Shape {
public Rectangle(int length, int width) {
super(length, width);
}
// Copy code
@Override
void printArea() {
int area = length * width;
System.out.println("The area of the rectangle is: " + area);
}
}
class Triangle extends Shape {
public Triangle(int length, int width) {
super(length, width);
}
// Copy code
@Override
void printArea() {
int area = (length * width) / 2;
System.out.println("The area of the triangle is: " + area);
}
}
class Circle extends Shape {
public Circle(int radius) {
super(radius, 0);
}
// Copy code
@Override
void printArea() {
double area = Math.PI * Math.pow(length, 2);
System.out.println("The area of the circle is: " + area);
}
}
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter shape (rectangle, triangle, circle): ");
String shape = sc.nextLine();
if (shape.equalsIgnoreCase("rectangle")) {
System.out.println("Enter length and width: ");
int length = sc.nextInt();
int width = sc.nextInt();
Rectangle rectangle = new Rectangle(length, width);
rectangle.printArea();
} else if (shape.equalsIgnoreCase("triangle")) {
System.out.println("Enter base and height: ");
int base = sc.nextInt();
int height = sc.nextInt();
Triangle triangle = new Triangle(base, height);
triangle.printArea();
} else if (shape.equalsIgnoreCase("circle")) {
System.out.println("Enter radius: ");
int radius = sc.nextInt();
Circle circle = new Circle(radius);
circle.printArea();
} else {
System.out.println("Invalid shape!");
}
}
}
Q2) Write a program that handles all mouse events and shows the event name
at the center of the Window, red in color when a mouse event is fired. (Use
adapter classes).
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Main extends JPanel {
String event = "";
// Copy code
public Main() {
addMouseListener(new MouseHandler());
addMouseMotionListener(new MouseHandler());
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.RED);
g.drawString(event, getWidth() / 2, getHeight() / 2);
}
class MouseHandler extends MouseAdapter {
public void mouseClicked(MouseEvent e) {
event = "Mouse clicked";
repaint();
}
public void mouseEntered(MouseEvent e) {
event = "Mouse entered";
repaint();
}
public void mouseExited(MouseEvent e) {
event = "Mouse exited";
repaint();
}
public void mousePressed(MouseEvent e) {
event = "Mouse pressed";
repaint();
}
public void mouseReleased(MouseEvent e) {
event = "Mouse released";
repaint();
}
public void mouseDragged(MouseEvent e) {
event = "Mouse dragged";
repaint();
}
public void mouseMoved(MouseEvent e) {
event = "Mouse moved";
repaint();
}
}
public static void main(String[] args) {
JFrame frame = new JFrame("Mouse Events");
frame.add(new Main());
frame.setSize(300, 300);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
}