I want to be able to undo changes made in JTextArea

I want to be able to undo changes made in JTextArea. Any 开发者_如何学Gohints?

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Have a look at

• ExampleDepot: Adding Undo and Redo to a Text Component
• The Java Tutorials: Implementing Undo and Redo
• JavaForums.org: Undo/Redo JTextArea

For common tasks like these, I suggest you google before asking.