为什么键/鼠标侦听器检测到鼠标按下而不是按键？ （Java awt 窗口）

Question

So, my window detects mouse presses but not key presses.

Here some shortened code:

public class Frame {
    public static final int MAX_WIDTH = (int) Toolkit.getDefaultToolkit().getScreenSize().getWidth();
    public static final int MAX_HEIGHT = (int) Toolkit.getDefaultToolkit().getScreenSize().getHeight();

    private static final JWindow window = new JWindow();
    private static final DrawMain dm = new DrawMain();
    private static final GIH gih = new GIH();

    public static void init() {
        window.setSize(CVar.clientSizeX, CVar.clientSizeY);
        window.setLocationRelativeTo(null);
        window.setAutoRequestFocus(true);
        window.add(dm);
        window.addMouseListener(mh);
        window.addMouseWheelListener(mh);
        window.addMouseMotionListener(mh);
        window.setVisible(true);
    }

    public static void update() {
            window.remove(dm);
            window.removeMouseListener(mh);
            window.removeMouseMotionListener(mh);
            window.removeMouseWheelListener(mh);
            window.setSize(MAX_WIDTH, MAX_HEIGHT);
            window.setLocationRelativeTo(null);
            window.add(dm);
            window.setAutoRequestFocus(true);
            window.setAlwaysOnTop(true);
            window.addMouseListener(gih);
            window.addMouseWheelListener(gih);
            window.addMouseMotionListener(gih);
            window.addKeyListener(gih);
            window.setVisible(true);
    }
}

public class GIH implements KeyListener, MouseListener, MouseMotionListener, MouseWheelListener {
    @Override
    public void keyReleased(KeyEvent e) {
        System.out.println(e.getKeyChar());
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        switch (e.getButton()) {
            case MouseEvent.BUTTON1 -> {
                System.out.println("Mouse 1 clicked");
            }
            case MouseEvent.BUTTON3 -> {
                System.out.println("Mouse 3 clicked");
            }
        }
    }

For whatever reason, i get my Mouse 1 clicked message if i click, but neither the key char if i press a key nor the output that the game would usually give on key press. Instead i write the respective character into IntelliJ (my IDE). I tried out multiple variations of window and dm.requestFocus() and window.setAutoRequestFocus(true) but none of them works. Does anyone know why? (Notice: dm is just a class with a paintComponent method)

Answer 1

try to add window.addKeyListener(...) into init() method.