Java KeyListener keyPressed方法触发太快 [英] Java KeyListener keyPressed method fires too fast

问题描述

如果您使用java KeyListener 类，您知道如果按住某个键 keyPressed 将触发一个 KeyEvent ，然后大约半秒后将非常快速地多次触发相同的键。我想知道是否有办法让 KeyEvents 从射击过快。我希望他们能够以每500毫秒一次的恒定速率进行。

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.

推荐答案

你可以，但诀窍是不要减慢事件的触发速度，但要降低处理它们的速度：

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) {   }

};

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