@Deprecated public abstract class NaturalKey extends Key
NaturalKeyrepresent 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.
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