Sir, I am a beginner of Java
programming Language and I want to creat a TextEditor. I done new, open, cut,
copy,paste action, but I can not
add the undo & redo support, because, whenever I use the TextListener
an error is showing that method textValueChanged(TextEvent e) not found in the class.

So,please give a soln to this problem and,
if possible please give also the source code for the TextEditor.(Simple)