KeyListeners无法正常工作

Question

我正在使用eclipse创建一个飞扬的鸟类游戏，我的键绑定向上或向下移动都没有任何效果，鸟只会跳到JFrame的底部。我可能需要帮助，如果语法是否正确，我甚至把addKeyListener（this）;在JFrame中，椭圆形显示出来，但就是它，它只是沉到底部

    public FlappyBird() {
        // Creating the parameters of the size of the frame with a set size
        Dimension d = new Dimension(FlappyBird.WIDTH, FlappyBird.HEIGHT);
        setSize(d);

    // The initial positions for the setting and birdie
        setting = new Setting(100); 
        birdie = new Bird(20,FlappyBird.HEIGHT/2,setting.pipes);
        addKeyListener(this);
        requestFocus();
    }


    private void updateGame() {
        // TODO Auto-generated method stub
        setting.updateGame();
        birdie.updateGame();
    }

    @Override
    public void keyPressed(KeyEvent e) {
        // TODO Auto-generated method stub
        if(e.getKeyCode() == KeyEvent.VK_SPACE) {
            birdie.isPressed = true;
        }
    }

    @Override
    public void keyReleased(KeyEvent e) {
        // TODO Auto-generated method stub
        if(e.getKeyCode() == KeyEvent.VK_SPACE          ) {
            birdie.isPressed = false;
        }
    }

    @Override
    public void keyTyped(KeyEvent arg0) {
        // TODO Auto-generated method stub

    }
}
 The second class is



public class Bird extends Rectangle {


    /**
     * 
     */
    // No idea what this does
    private static final long serialVersionUID = 1L;
    // Speed of the birdie
    private int speed = 4;
    // Checking if a certain key is pressed or not
    public boolean isPressed = false;
    private ArrayList <Rectangle> pipes;
    public Bird(int x, int y, ArrayList <Rectangle> pipes) {
        setBounds(x,y,32,32);
        this.pipes = pipes;
    }

    public void updateGame() {
        if(isPressed) {
            y-=speed;
        }
        else {
            y+=speed;
        }
        // If the birdie touches the pipes the window will close
        for (int k = 0; k < pipes.size(); k++) {
            if(this.intersects(pipes.get(k))) {
            System.exit(1);
        }
        }
    }
    public void renderGame(Graphics g) {
        g.setColor(Color.RED);
        g.fillOval(x, y, width, height);

    }

}