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。
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