HI,I need help on JFrame components. How to refresh them

I have a textfield and a textarea for users to input,
once users complete, they can then click save button,
I want to know how to let the Jframe get rid of all the contents input by users after they click save button?
now, when users click save button, all the stuff are still remained.
I tried to use repaint() but it just does not work
many thanks for ur reply

setText("");

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