Rewrite the program in Listing 13.9 so that the panel with the buttons changes to pink when the larger panel turns red. Similarly, when the larger panel turns green, the panel with the buttons changes to blue. Also add a label to the larger panel that says Watch this panel!, and add a button to the button panel that is labeled Change. When the Change button is clicked, the colors change (from pink and red to blue and green, respectively, or vice versa). The Change button has no effect on the initial configuration, in which the big panel is blue and the button panel is gray.
This program can be written by making a few changes to PanelDemo, Listing 13.9. One little extra detail is that buttonPanel must be visible in the actionPerformed method, so it is declared outside the constructor block. A character flag is used to keep track of the background color settings so the click-on-Change event can determine the new background colors (and not change them if they are the initial colors).
See the code in PanelDemo2.java. Uses WindowDestroyer.java.
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