Java如何检查用户是否按下了按键?
在Java中,我有一个程序需要连续检查用户是否按下了键。所以在伪代码中,像
if (isPressing("w")){
//do somthing
}
提前致谢!
回答:
在Java中,你不检查是否有键被按下,而不是你听到KeyEvent
秒。实现目标的正确方法是注册一个KeyEventDispatcher
,并实现它以维持所需密钥的状态:
import java.awt.KeyEventDispatcher;import java.awt.KeyboardFocusManager;
import java.awt.event.KeyEvent;
public class IsKeyPressed {
private static volatile boolean wPressed = false;
public static boolean isWPressed() {
synchronized (IsKeyPressed.class) {
return wPressed;
}
}
public static void main(String[] args) {
KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(new KeyEventDispatcher() {
@Override
public boolean dispatchKeyEvent(KeyEvent ke) {
synchronized (IsKeyPressed.class) {
switch (ke.getID()) {
case KeyEvent.KEY_PRESSED:
if (ke.getKeyCode() == KeyEvent.VK_W) {
wPressed = true;
}
break;
case KeyEvent.KEY_RELEASED:
if (ke.getKeyCode() == KeyEvent.VK_W) {
wPressed = false;
}
break;
}
return false;
}
}
});
}
}
然后,您可以随时使用:
if (IsKeyPressed.isWPressed()) { // do your thing.
}
当然,您可以使用相同的方法来实现isPressing("<some key>")
键映射及其包裹在状态中的状态IsKeyPressed
。
以上是 Java如何检查用户是否按下了按键? 的全部内容, 来源链接: utcz.com/qa/433790.html