Java applet窗格可通过箭头键移动吗？

Question

如何使Java applet不受限制或设置为一定的大小，我可以使用箭头键移动事物（而不是窗口），并且图像和内容将保留在原处？

Answer 1

You can use KeyListeners to do this task. Like this :-

class MyKeyListener extends KeyAdapter{
    public void keyPressed(KeyEvent e){
        switch (e.getKeyCode()){
            case KeyEvent.VK_LEFT:
            leftKey = true;
            break;
            case KeyEvent.VK_RIGHT:
            rightKey = true;
            break;
            case KeyEvent.VK_UP:
            upKey = true;
            break;
            case KeyEvent.VK_DOWN:
            downKey = true;
            break;
        }
    }
    public void keyReleased(KeyEvent e){
        switch (e.getKeyCode()){
            case KeyEvent.VK_LEFT:
            leftKey = false;
            break;
            case KeyEvent.VK_RIGHT:
            rightKey = false;
            break;
            case KeyEvent.VK_UP:
            upKey = false;
            break;
            case KeyEvent.VK_DOWN:
            downKey = false;
            break;
        }
    }

This is only a way how can you use the KeyListner and events. You can do it in your way.