java图片移动（键盘控制）

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import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class Sample extends Frame {

private Image img = null;
private Image img2 = null;
private Image img3 = null;
int by = 30;

public static void main(String[] args) {
new Sample();
}

public Sample() {
this.setSize(803, 603);
this.setLocation(100,100);

img = Toolkit.getDefaultToolkit().createImage("img/11.jpg");
img3 = Toolkit.getDefaultToolkit().createImage("img/11.jpg");
img2 = Toolkit.getDefaultToolkit().createImage("img/11.jpg");

this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});

this.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_RIGHT)
by = by + 5;
else if(e.getKeyCode() == KeyEvent.VK_LEFT)
by = by -5;
repaint();
}
});
this.setVisible(true);
}

public void paint(Graphics g) {
g.drawImage(img2, 100, 100,100,100, this);
g.drawImage(img3, by, 490,100,100, this);
g.drawImage(img, 580, 260,100,100,this);
}
}