Question

I’m trying to write a resolution selection dialog that pops up when a program first starts up. To prevent boring the user, I want to implement the fairly standard feature that you can turn off that dialog with a checkbox, but get it back by holding down the alt key at startup.

Unfortunately, there is no obvious way to ask java whether a given key is currently being pressed. You can only register to be informed of new key presses via a KeyListener, but that doesn’t help if the keypress starts before the app launches.

Answer 1

public class LockingKeyDemo {     static Toolkit kit = Toolkit.getDefaultToolkit();      public static void main(String[] args) {         System.out.println('caps lock2 = '                 + kit.getLockingKeyState(KeyEvent.VK_CAPS_LOCK)); } }