Thread: Code will not work to change speed with the up and down arrow keys

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
 
@SuppressWarnings("serial")
public class RacingCar extends JFrame {
 
public RacingCar() {
add(new CarImage());
}
 
public static void main(String[] args) {
JFrame frame = new RacingCar();
frame.setTitle("Racing Car");
frame.setSize(300, 150);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true); 
 
}
 
class CarImage extends JPanel {
protected int x = 0;
protected int y = 150;
protected int z = 300;
protected int c = 0;
protected int speed = 100;
 
public CarImage() {
Timer timer1 = new Timer(speed , new ActionListener(){
public void actionPerformed(ActionEvent e) {
x += 10;
c ++;
repaint();
}
});
timer1.start();
 
}
 
public void actionPerformed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_UP) {
    speed -= 50;
 
} else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
    speed += 50;	
}	
}
 
 
public void paintComponent(Graphics g) {
super.paintComponent(g);
 
 
// x = 0;
y = getHeight();
z = getWidth();
g.setColor(Color.WHITE);
g.fillRect(0, 0, z, y);
Polygon polygon = new Polygon();
polygon.addPoint(x + 10, y - 21);
polygon.addPoint(x + 20, y - 31);
polygon.addPoint(x + 30, y - 31);
polygon.addPoint(x + 40, y - 21);
 
 
if (x < z - 40) {
g.setColor(Color.BLACK);
g.fillOval(x + 10, y - 11, 10, 10);
g.fillOval(x + 30, y - 11, 10, 10);
g.setColor(Color.BLUE);
g.fillRect(x, y - 21, 50, 10);
g.setColor(Color.GRAY);
g.fillPolygon(polygon);
g.setColor(Color.RED);
}
else 
x = 0;
 
}
 
}
}