Removing a JButton

How would I remove a JButton from the screen after it's clicked? I've tried:

Code:

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        stButton = null;
                remove(stButton);

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But it seems all that does is stop it listening, as the button stays in place but no longer reacts when clicked. I'd like to remove the button completely if possible.

Try removing it from it's parent container e.g

Code:

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jPanel.remove(stButton);

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Removing it that way gives:

Code:

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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

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Are you setting the JButton to null before removing it? That would explain the null pointer... Remove the JButton first, then set it to null if you like

I've tried various ways, all of which give me that exception. Each time it says it's the remove(stButton) that's causing it, but I can't see how. :/

It would help to see more of the code

Don't call it on a null JPanel.

Quote:

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Originally Posted by StormyWaters

It would help to see more of the code

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Indeed. There's no way we can help given the information provided.

What more do I need to provide?

How about the classes involved, unless they are too big.

Try creating a small example application which demonstrates your problem

Make sure the JPanel isn't null.
Make sure the button isn't null
Make sure the button exists on the panel.

I'm sure the JPanel isn't null, nor is the button, and as far as I can tell the button exists on the panel. Is there any way to check this?

Quote:

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I'm sure the JPanel isn't null, nor is the button

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The JVM isn't lying. Something is null. Period.

Quote:

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Is there any way to check this?

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Sure, just call something like:

Code:

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System.out.println("Is myJPanel null: " + (myJPanel == null));

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Better still: show us compilable code that demonstrates the problem.

Hmm, it's fixed now. Calling remove from JFrame successfully removes it.

Thanks for providing assistance with this everyone. :)

Now tell us what the problem was ;) And the solution. So other people can read it and help theirselfes. :)

The problem was I was attempting to remove the JButton from the JPanel alone. I solved it by removing it from the JFrame.

(JFrame f)

Code:

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        f.remove(stButton);

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Thanks again for your help guys. :D If you have anything to add, please do. :)