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並前往https://www.dreamincode.net/forums/topic/249958-making-java-add-to-text-to-a-jtextarea-and-not-override-the-old-text/

making java add to text to a jtextarea and not override the old ...

Or you can invoke getText(), and pass that String to the setText() method first, then concatenate it with the new text. thank u this worked out ...

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