Creating Undo Option in drawing application

Hi !
I am developing a drawing tool.
& I want to add undo/redo menu so that it will undo/redo any drawing made by user & I am using BufferedImage for storing the drawing.
can anybody post any example or any drawing program with undo/redo option.
Please Help me out !
Thanks in advance

If it's DPS no. There is no native search available.
You'd have to do the entire thing in HTML.
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