Two Buttons in a Frame

Let's develop a new program:

• A frame will hold two buttons, one labeled "Red" and the other "Green."
• The FlowLayout layout manager will be used so the buttons will be nicely positioned in the frame.
• When the button marked "Red" is clicked, the background will turn red.
• When the button marked "Green" is clicked, the background will turn green.
• There will be one event listener that listens to the clicks from both buttons.
• When the "close button" of the frame is clicked, the application quits.

This is very close to a previous example program. It would be sensible to copy that file and edit it for the new application. However, as a review of these somewhat confusing GUI implementation details, let us start from scratch.