这篇博客介绍了如何在Java中检测用户是否按下了箭头键。通过使用KeyEvent类，你可以监听键盘输入并根据不同的键码进行响应。例如，使用`keyPressed(KeyEvent e)`方法，通过`e.getKeyCode()`获取按键码，然后用switch语句判断VK_UP、VK_DOWN、VK_LEFT和VK_RIGHT来处理上下左右方向键。你需要将这个方法添加到组件的事件监听器中，以便在事件发生时触发相应操作。
I am a beginner in Java an I have been looking on how to detect if the user pressed a key (such a the arrow keys). Apparently there are a lot of ways to do such a thing, and I found that this method should work for me:
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
switch( keyCode ) {
case KeyEvent.VK_UP:
// handle up
break;
case KeyEvent.VK_DOWN:
// handle down
break;
case KeyEvent.VK_LEFT:
// handle left
break;
case KeyEvent.VK_RIGHT :
// handle right
break;
}
}
The problem is that I have no idea what a KeyEvent is.
Can anyone tell me what to put in the parentheses when I call the method and show me an example please?
PS: don't send me to an other site, I probably have already looked at it and they just confuse me more...
解决方案
public class KeyEvent
extends InputEvent
An event which indicates that a keystroke occurred in a component.
This event is generated by a component object (such as a text field) when a key is
pressed, released, or typed. The event is passed to every KeyListener or KeyAdapter object
which registered to receive such events using the component's addKeyListener method.
(KeyAdapter objects implement the KeyListener interface.) Each such listener object gets this KeyEvent when the event occurs.
and using that event object, you can get the event details like what key has been pressed using e.getKeyCode() some more methods like that.
扫一扫
8557
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
