keyPressed方法java

Question

public class Board extends JPanel implements Runnable, KeyListener{
 public static final int HEIGHT = 950;
 public static final int WIDTH = 1000;
private JFrame jf;
 private Enemy enemy;
 private boolean board[][];
 public Board( int r, int col) {
        this.rows = r;
        this.columns = col;
        enemy = new Enemy(rows, columns, this, extraEnemy);

        board = new boolean[rows + extraEnemy][columns + extraEnemy];

        setSize(WIDTH , HEIGHT);
        jf = new JFrame();
        jf.setSize(WIDTH , HEIGHT);

        (new Thread(this)).start();

        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
        jf.setLocation((d.width - 950) / 2, (d.height - 1000) / 2);

        jf.add(this);
        jf.addKeyListener(this);
        jf.getContentPane().add(this);
        jf.getContentPane().add(player);
        jf.setLayout(null);
        jf.setVisible(true);
        }
          @Override
    public void run() {
        while (true) {
            long d = System.currentTimeMillis();
            while (d + 100 > System.currentTimeMillis());
            this.repaint();
        }
    }
@Override
    public void keyPressed(KeyEvent e) {
        System.out.println(" hereeee");
        if(e.getKeyCode() == VK_SPACE){
  //          bullet = new Bullet(player.getX(), player.getY());
    //        bulletVec.addElement(bullet);
      //      clickedOn =true;
        }
    }

我正在Java Swing中编写一个程序，其中我有一个JPanel，在里面，我定义了一个JFrame，可以帮助我将keyListener添加到我的面板中。但是，虽然我编写了addKeyListener方法，但该程序并未输入keyPressed方法。