Labeled Diagram.

Classic programmed-learning exercises, refreshed for modern Java and presented in the current MrStyner.com portfolio style.

Modern Java noteThis archive has been refreshed for Java 25 LTS. Core language concepts remain useful, while outdated setup instructions and browser-era Java are labeled or replaced. Java 26 is the current feature release; Java 25 is used here as the stable teaching baseline.
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Answer:

See Below.

Labeled Diagram.

Here is the labeled diagram. If you got a few wrong, come back later and try again.

completed diagram

QUESTION 21:

Does the diagram show that the JButton has been added to the ButtonQuitter object?

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