Duvida com eventos de teclas

public class Board extends JPanel {
	private Image ball;
	private int x = 250;
	private int y = 200;
	public boolean down;
	public boolean up;
	public boolean right;
	public boolean left;

	Board() {
		addKeyListener(new TAdapter());
		ImageIcon b = new ImageIcon(this.getClass().getResource("lixo.png"));
		ball = b.getImage();
	}

	public void paint(Graphics g) {
		super.paint(g);

		g.drawImage(ball, x, y, this);

	}

	public void move() {
		if (left) {
			x -= 5;
		}

		if (right) {
			x += 5;
		}

		if (up) {
			y -= 5;
		}

		if (down) {
			y += 5;
		}
	}

	public static void start() {
		JFrame f = new JFrame();
		f.add(new Board());
		f.setVisible(true);
		f.setSize(500, 500);

	}

	public void actionPerformed(ActionEvent e) {
		move();
		repaint();
	}

	private class TAdapter extends KeyAdapter {

		public void keyPressed(KeyEvent e) {

			int key = e.getKeyCode();
			if (key == KeyEvent.VK_LEFT) {
				left = true;
				up = false;
				down = false;

			}

			if (key == KeyEvent.VK_RIGHT) {
				right = true;
				up = false;
				down = false;
			}

			if (key == KeyEvent.VK_UP) {
				up = true;
				right = false;
				left = false;
			}

			if (key == KeyEvent.VK_DOWN) {
				down = true;
				right = false;
				left = false;
			}
		}
	}

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

}