How to UNDO a function in java

I need to have a UNDO function in java using the (CONTROL and Z )key pressed.
Please try to give the solution because it is quite so important to me.
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ashok3sepAsked:
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ashok3sepAuthor Commented:
But i want to undo all the previous operation not text element but also if i make any changes in my diagram.
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TimYatesCommented:
http://www.javaworld.com/javaworld/jw-06-1998/jw-06-undoredo.html

Shows how to use the UndoManager with a list...  

Basically, each operation the user performs has to be a class that extends AbstractUndoableEdit.  It is up to you to provide the implementations that say whether an operation can be undone, what happens when it is undone, and how it can be redone...

The applet doesn't work on that page, but the code is valid :-)

Tim.
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