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Listening to All Key Events Before Delivery to Focused Component

import java.awt.KeyEventDispatcher; import java.awt.KeyboardFocusManager; import java.awt.event.KeyEvent; public class Main {   public static void main(String[] argv) throws Exception {     KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(         new KeyEventDispatcher() {           public boolean dispatchKeyEvent(KeyEvent e) {             if (e.getID() == KeyEvent.KEY_TYPED) {               e.setKeyChar('a');             }             boolean discardEvent = false;             return discardEvent;           }         });   } }