java keylistener 导出后不工作

Question

我有一个 JFrame 来托管我的 Applet。小程序上有一个 KeyListener 来处理箭头键和 Enter/Escape 键。

当我在 Eclipse 中运行 JFrame 时，一切正常，箭头键以及 Enter 和 Escape 键都有响应。

但是，当我将项目导出到可执行 Jar 文件时...箭头键仍然有效，但 Enter 和转义键不起作用。我该如何解决这个问题？

主类中的代码:

public static void main(String[] args) throws Exception {
    new SnakeApp().snake();
}

public void snake() throws Exception {
    // Set windows look
    UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");

    // Create window
    JFrame window = new JFrame("FinalSnake");
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // Add FinalSnake applet
    FinalSnake finalSnake = new FinalSnake();
    finalSnake.init();
    finalSnake.start();
    window.add(finalSnake);

    // Set size
    window.setResizable(false);
    window.getContentPane().setPreferredSize(new Dimension(FinalSnake.GRIDSIZE * FinalSnake.GRIDX, FinalSnake.GRIDSIZE * FinalSnake.GRIDY));
    window.pack();

    // Set Icon
    window.setIconImage(new ImageIcon(this.getClass().getResource("gfx/icon.png")).getImage());

    // Center the frame
    Dimension frameSize = Toolkit.getDefaultToolkit().getScreenSize();
    window.setLocation((frameSize.width - window.getSize().width) / 2, (frameSize.height - window.getSize().height) / 2);

    // Show the window
    window.setVisible(true);

    // And focus the FinalSnake applet
    finalSnake.requestFocusInWindow();
}

来自 FinalSnake Applet 的代码:

@Override
public void keyPressed(KeyEvent e) {
    if (this.world == null) {
        if (e.getKeyCode() == KeyEvent.VK_UP || e.getKeyCode() == KeyEvent.VK_LEFT) {
            this.gameType--;

            if (this.gameType == 0) {
                this.gameType = 2;
            }
        }

        if (e.getKeyCode() == KeyEvent.VK_DOWN || e.getKeyCode() == KeyEvent.VK_RIGHT) {
            this.gameType++;

            if (this.gameType == 3) {
                this.gameType = 1;
            }
        }

        if (e.getKeyCode() == KeyEvent.VK_ENTER || e.getKeyCode() == KeyEvent.VK_SPACE) {
            this.world = new World(this.gameType);
        }
    } else {
        if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
            this.world = null;
        }
    }
}

希望有人能为我解决这个问题......谢谢

Answer 1

您可以尝试使用consume()您的 KeyEvent 变量上的方法。它说:

Consumes this event so that it will not be processed in the default manner by the source which originated it.

我猜这将覆盖默认方式。

public void keyPressed(KeyEvent e) {
//Do your actions
e.consume();
}