How do I use Processing to read and write data to an Arduino

Processing Electronics (Arduino, etc.)
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So the old string is destroyed automatically? (Java vs C memory management)

Any examples available for changing a text or label object based on radio button selection?
As in, select this button, text says “First”, select second bubtton text says “Second”, back to first button, text says “First”.
Looking for how to capture user action for further processing.

Thomas Stephens DeSoto, TX