implement copy/paste/delete/redo/undo functionalities. base code will be provided

I need to implement copy/paste/delete/redo/undo functionalities. base code will be provided. here is the functionality:
Copy
– Copies the selected shape(s)
Paste
– If there is anything copied, paste it on the screen somewhere. You can
paste it at origin (0, 0), the middle of the canvas, or somewhere else
that makes sense.
Undo
– Undo the last operation. Keep in mind, some operations do not need to
be undo-able – for instance, “Copy” probably doesn’t need to be
undoable (though “paste” probably should).
Redo
– Redo the last operation. See undo.
Delete
– Deletes the selected shape(s)

Attachments:

JavaPaintAssi….rar

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