Answer 1

Ok when you work with eclipse and if you make some mistake in your code then you want undo last action it find in toolbar of eclipse undesrtood?
But now i'm coding my JFrame and my toolbar so i make some contenpane like(Jtextefile,Jboutton or ...) now i would make the undo action on my JBoutton clik =new JBoutton ("undo") how add this action with Actionlistener?