具有焦点的 KeyListener 无法正常工作

Question

我正在为我的代码添加一个密钥侦听器，但它没有响应。我不知道这个问题是否多余，但关于类似问题的其他问题都说我应该关注组件。但是，正如您在此处看到的那样，我已尝试这样做，但没有成功。我还有一个线程运行渲染我的（非常糟糕的）游戏，这可能是个问题，但同样，我只是不知道。

private GamePanel() {

        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); //get screen dimensions. 

        myImage = new BufferedImage((int) screenSize.getWidth(), (int) screenSize.getHeight(), BufferedImage.TYPE_INT_RGB);
        myBuffer = myImage.getGraphics();
        Player p = new Player(400, 500);
        p.draw(myBuffer);
        abc = new Player(400, 500);
        this.addKeyListener(new Key());
        setFocusable(true);
        this.requestFocus();

    }
public void init() {
    JFrame frame = new JFrame("im bad at coding");
    frame.setLocation(0, 0);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(this);
    frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
    frame.setUndecorated(false);
    frame.setVisible(true);
    //ive tried to request focus and set focusable here, but no results
    new Thread(this).start(); 

}

Answer 1

我认为这可能是由于

A) Not initializing your Game object at all when creating the JFrame
B) Not properly embedding your key listener

试试这个：

public static void main(String[] args) {
    GamePanel panel = new GamePanel(); //Call your init methods to initialize the panel only, not the jframe
    //Initialize the key listener object either implemented in the game panel itself, or initialized inside of the panel
    new Thread(panel).start(); 
    JFrame frame = new JFrame("im actually not that bad at coding");
    frame.setLocation(0, 0);
    frame.add(panel);
    frame.addKeyListener(panel.getKeyListener()); //Or addListener, i am doing this not on an IDE
    frame.setDefaultCloseOperation(JFrame.BLOW_UP_SYSTEM_ON_EXIT);
    //Optional, just click the frame: frame.setFocus(true);
    frame.pack();
    frame.setVisible(true);
}

具有焦点的 KeyListener 无法正常工作

KeyListener with focus not functioning

java

focus

keylistener