swing - Java KeyListener keyPressed method fires too fast

Question

If you use the java KeyListener class you know that if you hold down a key keyPressed will fire one KeyEvent, and then about half a second later will fire the same key many times very very fast. I would like to know if there is a way to keep the KeyEvents from firing too fast. I would like them to be at a nice constant rate of about once every 500 ms.

Answer 1

You can, but the trick is to not slow down the firing of events, but to slow down how fast you process them:

KeyListener kl = new KeyListener() {
    private long lastPressProcessed = 0;

    @Override
    public void keyPressed(KeyEvent e) {
        if(System.currentTimeMillis() - lastPressProcessed > 500) {
            //Do your work here...
            lastPressProcessed = System.currentTimeMillis();
        }           
    }

    @Override
    public void keyTyped(KeyEvent e) {}

    @Override
    public void keyReleased(KeyEvent e) {   }

};