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For starters I would move most of the code from your main method into the GUI class. Then you can make your Listener classes inner classes of the GUI class. This will allow them to have access to...

err no you can't. Unless you are using a different version of Java to everyone else on the planet.

You have declared ColorField inside the main method of the ColorSelectorTester class and then trying to access it from the RButtonListener class. You cannot do this. You can only access a variable...