Solution to getKeyCode() returns 0 in Java
Summary
When handling keyboard input in Java, `getKeyChar()` is specifically designed for `KEY_TYPED` events, reliably returning a valid Unicode character. Conversely, `getKeyCode()` is intended for `KEY_PRESSED` and `KEY_RELEASED` events, providing the event's specific keyCode. It's crucial to understand that `KEY_PRESSED` and `KEY_RELEASED` events are not directly tied to character input. Therefore, attempting to use `getKeyCode()` with `KEY_TYPED` events will consistently return `VK_UNDEFINED`, indicating that the method is not applicable for that event type.
CHAR_UNDEFINED. Character input is reported by KEY_TYPED events:
KEY_PRESSED and KEY_RELEASED events are not necessarily associated with
character input. Therefore, the result of the getKeyChar method is
guaranteed to be meaningful only for KEY_TYPED events.
For key pressed and key released events, the getKeyCode method returns
the event's keyCode. For key typed events, the getKeyCode method always
returns VK_UNDEFINED.
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