Write
a java program using Applet for bouncing ball. Ball should change its color for
each bounce.
import
java.applet.*;
import
java.awt.*;
public
class BouncingBallApplet extends Applet implements Runnable {
private int x, y; // Current position of
the ball
private int xSpeed, ySpeed; // Speed of the
ball
private Color[] colors = { Color.RED,
Color.GREEN, Color.BLUE, Color.ORANGE, Color.MAGENTA };
private int colorIndex = 0;
public void init() {
x = 100;
y = 100;
xSpeed = 3;
ySpeed = 2;
}
public void start() {
Thread t = new Thread(this);
t.start();
}
public void run() {
while (true) {
if (x < 0 || x > getWidth() -
20) {
xSpeed = -xSpeed; // Reverse
direction when hitting the left or right edge
changeColor();
}
if (y < 0 || y > getHeight()
- 20) {
ySpeed = -ySpeed; // Reverse
direction when hitting the top or bottom edge
changeColor();
}
x += xSpeed;
y += ySpeed;
repaint();
try {
Thread.sleep(16); // Sleep for
a short time to control animation speed
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
private void changeColor() {
colorIndex = (colorIndex + 1) %
colors.length;
setBackground(colors[colorIndex]);
}
public void paint(Graphics g) {
g.setColor(Color.WHITE);
g.fillRect(0, 0, getWidth(),
getHeight());
g.setColor(colors[colorIndex]);
g.fillOval(x, y, 20, 20);
}
}
