DEPARTMENT OF COMPUTER ENGINEERING
Subject: Advance Java Programming Subject Code:22517
Semester:5 th Semester Course: Computer Engineering
Laboratory No: Name of Subject Teacher: Prof. Prasad
Koyande
Name of Student: Shivam Teli Roll Id: 22203A0008
Assignment No: 3
1. Create a Java application where clicking on a specific part of the screen
changes the background color of a JPanel. Use MouseListener to capture
mouse clicks.
Code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.BorderLayout;
public class Changer extends JFrame {
JPanel panel;
public Changer() {
setTitle("Shivam Teli 22203A0008");
setSize(400, 300);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new BorderLayout());
panel = new JPanel();
panel.setBackground(Color.WHITE);
panel.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
changeColor();
}
});
add(panel, BorderLayout.CENTER);
}
void changeColor() {
Color newColor = new Color((float) Math.random(), (float)
Math.random(), (float) Math.random());
panel.setBackground(newColor);
}
public static void main(String[] args) {
Changer app = new Changer();
app.setVisible(true);
}
}
Output:
2. Develop a Java program that listens for arrow key presses (KeyListener)
and moves a circle up, down, left, or right in a JPanel.
Code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
public class MoveCircle extends JFrame {
JPanel panel;
int x = 100;
int y = 100;
public MoveCircle() {
setTitle("Shivam Teli 22203A0008");
setSize(400, 400);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
panel = new JPanel() {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.ORANGE);
g.fillOval(x, y, 30, 30);
}
};
panel.setFocusable(true);
panel.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_UP) y -= 5;
if (e.getKeyCode() == KeyEvent.VK_DOWN) y += 5;
if (e.getKeyCode() == KeyEvent.VK_LEFT) x -= 5;
if (e.getKeyCode() == KeyEvent.VK_RIGHT) x += 5;
panel.repaint();
}
});
add(panel);
}
public static void main(String[] args) {
MoveCircle moveCircle = new MoveCircle();
moveCircle.setVisible(true);
}
}
Output:
3. Write a Java program with two buttons: "Start" and "Stop". Clicking
"Start" begins a timer that updates a counter on the screen every second,
and clicking "Stop" pauses the timer.
Code:
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Counter extends JFrame {
JButton startButton;
JButton stopButton;
JLabel counterLabel;
Timer timer;
int counter = 0;
public Counter() {
setTitle("Shivam Teli 22203A0008");
setSize(300, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
counterLabel = new JLabel("Counter: 0", SwingConstants.CENTER);
add(counterLabel, "North");
startButton = new JButton("Start");
stopButton = new JButton("Stop");
JPanel buttonPanel = new JPanel();
buttonPanel.add(startButton);
buttonPanel.add(stopButton);
add(buttonPanel, "South");
timer = new Timer(1000, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
counter++;
counterLabel.setText("Counter: " + counter);
}
});
startButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
timer.start();
}
});
stopButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
timer.stop();
}
});
}
public static void main(String[] args) {
Counter app = new Counter();
app.setVisible(true);
}
}
Output:
4. Create a Java form that contains three checkboxes: "Red", "Green",
and "Blue". Use ItemListener to change the background color of the form
based on the selected checkboxes.
Code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.BorderLayout;
public class Q4 extends JFrame {
JCheckBox orangeCheckBox;
JCheckBox blueCheckBox;
JCheckBox yellowCheckBox;
public Q4() {
orangeCheckBox = new JCheckBox("Red");
blueCheckBox = new JCheckBox("Blue");
yellowCheckBox = new JCheckBox("Green");
ItemListener checkboxListener = new ItemListener() {
public void itemStateChanged(ItemEvent e) {
updateBackgroundColor();
}
};
orangeCheckBox.addItemListener(checkboxListener);
blueCheckBox.addItemListener(checkboxListener);
yellowCheckBox.addItemListener(checkboxListener);
JPanel checkBoxPanel = new JPanel();
checkBoxPanel.add(orangeCheckBox);
checkBoxPanel.add(blueCheckBox);
checkBoxPanel.add(yellowCheckBox);
add(checkBoxPanel, BorderLayout.NORTH);
setTitle("Shivam Teli 222203A0008");
setSize(400, 400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
}
void updateBackgroundColor() {
int red = orangeCheckBox.isSelected() ? 255 : 0;
int green = yellowCheckBox.isSelected() ? 255 : 0;
int blue = blueCheckBox.isSelected() ? 255 : 0;
Color newColor = new Color(red, green, blue);
getContentPane().setBackground(newColor);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
new Q4().setVisible(true);
});
}
}
Output:
5. Create a Java form that contains three checkboxes: "Red", "Green",
and "Blue". Use ItemListener to change the background color of the form
based on the selected checkboxes.
Code:
import javax.swing.*;
import javax.swing.border.Border;
import java.awt.*;
import java.awt.event.*;
import java.awt.BorderLayout;
public class Focus extends JFrame {
JTextField nameField;
JTextField departmentField;
JTextField rollNoField;
Border defaultBorder;
Border focusedBorder;
public Focus() {
setTitle("Shivam Teli 22203A0008");
setSize(400, 150);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new BorderLayout());
defaultBorder = BorderFactory.createLineBorder(Color.GRAY);
focusedBorder = BorderFactory.createLineBorder(Color.ORANGE, 5);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(3, 2));
JLabel nameLabel = new JLabel("Name:");
nameField = createTextField();
panel.add(nameLabel);
panel.add(nameField);
JLabel departmentLabel = new JLabel("Department:");
departmentField = createTextField();
panel.add(departmentLabel);
panel.add(departmentField);
JLabel rollNoLabel = new JLabel("Roll No:");
rollNoField = createTextField();
panel.add(rollNoLabel);
panel.add(rollNoField);
add(panel, BorderLayout.CENTER);
}
private JTextField createTextField() {
JTextField textField = new JTextField();
textField.setBorder(defaultBorder);
textField.addFocusListener(new FocusListener() {
public void focusGained(FocusEvent e) {
textField.setBorder(focusedBorder);
}
public void focusLost(FocusEvent e) {
textField.setBorder(defaultBorder);
}
});
return textField;
}
public static void main(String[] args) {
Focus example = new Focus();
example.setVisible(true);
}
}
Output:
6. Create a Java application that logs messages in the console when a
window is minimized, maximized, closed, or opened. Use WindowListener
to handle these events.
Code:
import java.awt.*;
import java.awt.event.*;
public class WindowExample extends Frame implements WindowListener {
WindowExample() {
addWindowListener(this);
setSize (400, 400);
setLayout (null);
setVisible (true);
}
public static void main(String[] args) {
new WindowExample();
}
public void windowActivated (WindowEvent arg0) {
System.out.println("activated");
}
public void windowClosed (WindowEvent arg0) {
System.out.println("closed");
}
public void windowClosing (WindowEvent arg0) {
System.out.println("closing");
dispose();
}
public void windowDeactivated (WindowEvent arg0) {
System.out.println("deactivated");
}
public void windowDeiconified (WindowEvent arg0) {
System.out.println("deiconified");
}
public void windowIconified(WindowEvent arg0) {
System.out.println("iconified");
}
public void windowOpened(WindowEvent arg0) {
System.out.println("opened");
}
}
Output:
7. Write a program where the user can drag and drop a rectangle inside a
JFrame. Use MouseListener and MouseMotionListener to handle the
dragging.
Code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class DragRectangle extends JFrame {
int rectX = 50;
int rectY = 50;
int rectWidth = 100;
int rectHeight = 50;
boolean dragging = false;
int mouseX;
int mouseY;
public DragRectangle() {
setTitle("Shivam Teli 22203A0008");
setSize(400, 300);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
if (e.getX() >= rectX && e.getX() <= rectX + rectWidth &&
e.getY() >= rectY && e.getY() <= rectY + rectHeight) {
dragging = true;
mouseX = e.getX() - rectX;
mouseY = e.getY() - rectY;
}
}
public void mouseReleased(MouseEvent e) {
dragging = false;
}
});
addMouseMotionListener(new MouseAdapter() {
public void mouseDragged(MouseEvent e) {
if (dragging) {
rectX = e.getX() - mouseX;
rectY = e.getY() - mouseY;
repaint();
}
}
});
}
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.BLUE);
g.fillRect(rectX, rectY, rectWidth, rectHeight);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
DragRectangle dragRectangle = new DragRectangle();
dragRectangle.setVisible(true);
});
}
}
Output:
