How can a KeyListener detect key combinations (e.g., ALT + 1 + 1)

Question

How can I let my custom KeyListener listen for combinations of ALT (or CTRL for that matter) + more than one other key?

Assume

Answer 1

I would suggest that instead of using key combinations, consider some input field when the window isVisible() and is focused. The field can be hidden, like Windows' File explorer hidden filename search (enter a directory, type the filename and the correspondence is focused), or is visible, like in Ubuntu.

Key combinations are not designed for including more than one key other than modifiers, although you may be able to achieve this.