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Yes, presuming you do not wish to redesign as I recommended above.

I would recommend expanding your resources beyond just your book. In fact, the java API should be at the top of your list to become familiar with. The JFrame class has a method named validate (it is...

You are attempting to add components to a container after it has been realized (in this case, after the JFrame is visible). Either add it before, or call revalidate on the JPanel or validate on the...