Concept explainers
Does it matter whether we write
in the outer wrapper of a class? Edit the source of the TicketMachine class to make the change, and then close the editor window. Do you notice a change in the class diagram?
What error message do you get when you now press the Compile button? Do you think this message clearly explains what is wrong?
Change the class back to how it was, and make sure that this clears the error when you compile it.
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