Allows developers to provide support for undo/redo in applications such as text editors.

Note: Most of the Swing API is not thread safe. For details, see Threads and Swing, a section in The Java Tutorial.

## Related Documentation

For overviews, tutorials, examples, guides, and tool documentation, please see:

- Implementing Undo and Redo, a section in The Java Tutorial

@since 1.2 @serial exclude