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So you answered a question other than the one asked. That must have been helpful!

db

The question was about clearing the selection in a ButtonGroup, not about removing components from a visible GUI.

db

Chances are you have more than one variable with the same name: the one an instance field, the other a method local variable that hides it.

To get better help sooner, post a SSCCE. <== link

db

That's just ... silly. The if statement requires a boolean condition, which isSelected() already returns.

It is NEVER required to compare a boolean with true or false.

db