- All Implemented Interfaces:
NaturalKey represent all keys on the keyboard not
known by convention as 'modifier keys'. These can either be keys that belong
to a natural language of some kind(e.g., "A", "1"), any Unicode character
(e.g., "backspace"), or they can be special controls keys used by computers
(e.g., "F10", "PageUp").
NaturalKey objects are immutable. Clients are not permitted to
extend this class.
- This class is not intended to be subclassed by clients.