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Disable JButton

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I want to disable JButton until all the text fields are filled with text. . . Thats OK. But then I need to disable the JButton if any of the filled text box is empty (probably,if the user remove all the text from the Text Field).
I tried the method "removeUpdate()" in DocumentListener Interface. But its not working. Please give me a solution
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> But its not working.

post what you've tried
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