Exercise 1 — Toggle Color Button

Modify the ButtonDemo program so that
it changes the color of the frame for every click
of the button.
Change the color back and forth from red and blue.
Start the frame out with a blue background.

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Exercise 2 — Click Counter

Modify the ButtonDemo program so that
the text on the button shows how many times the button
has been clicked.
Use the method setText(String text)
to change the button’s text.

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