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What you want is the JRadioButton that is selected. The ButtonGroup the JRadioButton is in can be used to get data from the JRadioButton that is selected.

Is the variable defined in the correct...

I can't find a way to get to the JRadioButton using the ButtonGroup. Is there a path through the classes and methods to get it?

Look at the ButtonGroup class. It probably has a way to get a reference to the selected radio button.

What is the name of the local variable and the name of the field that is hidden?
Do you have variables with the same name defined in two places: one local to a method and one in the class?
The...