小编use*_*733的帖子

我正在尝试使用我的JPanel类中的KeyListener按下其中一个箭头键时执行某些操作.这是我的代码:

public class TestPanel extends JPanel implements KeyListener{

    public TestPanel(){
        this.addKeyListener(this);
        this.setFocusable(true);
        this.requestFocusInWindow();
    }

    public void keyPressed(KeyEvent e) {
        if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
            System.out.println("Right");

        }

        if (e.getKeyCode() == KeyEvent.VK_LEFT) {
            System.out.println("Left");
        }

    }

    public void keyTyped(KeyEvent e) {}
    public void keyReleased(KeyEvent e) {}
}

我的main方法将一个新面板实例添加到一个框架并显示它.我需要将keylistener添加到JFrame吗？在我的情况下,这将是困难和低效的,所以如果可能的话,我想让它与这个JPanel一起工作.谁知道我做错了什么？

编辑:键绑定代码不起作用:

public class GamePanel extends JPanel implements ActionListener{

//Constructor
public GamePanel(){

    setupKeyBinding();
    this.setFocusable(true);
    this.requestFocusInWindow();


}

private void setupKeyBinding() {
    int condition = JComponent.WHEN_IN_FOCUSED_WINDOW;
    InputMap inMap = getInputMap(condition);
    ActionMap actMap = getActionMap();

    inMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0), "Left"); …