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KeyEvent

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import java.awt.event.KeyEvent;

import pi.Controller;
import pi.Scene;
import pi.actor.Actor;
import pi.Rectangle;
import pi.event.KeyStrokeListener;

public class KeyEventDemo extends Scene implements KeyStrokeListener
{
    Actor rectangle;

    public KeyEventDemo()
    {
        rectangle = new Rectangle(2, 2);
        add(rectangle);
    }

    @Override
    public void onKeyDown(KeyEvent keyEvent)
    {
        switch (keyEvent.getKeyCode())
        {
        case KeyEvent.VK_UP:
            rectangle.moveBy(0, 1);
            break;

        case KeyEvent.VK_RIGHT:
            rectangle.moveBy(1, 0);
            break;

        case KeyEvent.VK_DOWN:
            rectangle.moveBy(0, -1);
            break;

        case KeyEvent.VK_LEFT:
            rectangle.moveBy(-1, 0);
            break;
        }
    }

    public static void main(String[] args)
    {
        Controller.start(new KeyEventDemo(), 600, 400);
    }
}
Zum Java-Code: demos/subprojects/demos/src/main/java/demos/docs/events/key_event/KeyEventDemo.java