A good answer might be:

Yes. Any program that uses a formula to calculate a result based on user input could be created by "hacking" upon this one. If you need more input values, add more JTextFields and JLabels.

End of the Chapter

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Obtaining numeric data from the user.
Complete temperature conversion application.
Design of the fat calculator.
Complete fat calculator program.
Using a doIt button
Problems with picking the right frame size.

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You have reached the end of the chapter.