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That will be a good idea. You need to understand how a program works and what all the classes and methods do if you want to write a program and have it work correctly.
If you are just copying...

Did you try adding the println methods as I suggested?
Were the methods being called that do the drawing?
What will cause the methods to be called so they will do the drawing?

Are the methods being called that do the drawing? Try debugging the code by adding some calls to the println method that print out messages when the various methods are called so you can see when or...

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