KeyListener on JComponent for Ctrl key

Question

I'd like to have a KeyListener on a JComponent in Swing that reacts on press and release of the ctrl key. This a naive, but suboptimal solution (it reacts on every keypress, not only on press/release of the ctrl key:

new KeyAdapater() {
  public void keyPressed(KeyEvent e) {
    if (e.isControlDown()) {
       //do something
    }
  }
  public void keyReleased(KeyEvent e) {
    if (!e.isControlDown()) {
       //do something other
    }
  }
}

What is a better approach to only trigger, when the ctrl key itself is pressed or released?

Answer 1

Try this:

public void keyPressed(KeyEvent e) {
    if (e.getKeyCode() == KeyEvent.VK_CONTROL) {
       //do something
    }
}