g Your task is to provide the three classes: AppendUndoModel1, AppendUndoView1, and AppendUndoController1 so that they implement the corresponding interfaces. The easiest way to get started is to copy the DemoModel1.java, DemoView1.java, and DemoController1.java files from the DemoGUI3 project into the src directory of the AppendUndoGUI project, rename them appropriately, and then edit them until all compiler errors are gone and their behavior matches the corresponding interfaces. Note: if you cannot get everything compiling and/or working it is OK. You will get a chance to complete this task in lab with help from the instructors. However, you should try to get as far as you can on your own.
