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How to resize JFrame programmatically?

 
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I have a JFrame which contains a JSplitPane.
In the JSplitPane, there are 2 JPanels.
Normally second JPanel is invisible, but when the
user presses a button it will become visible.
I want the JFrame to be resized automatically.
When it shows a single panel, its size will shrink;
and when it shows both panels it will become larger.
How can I do that?
Thanks.
Ahmet Aksoy
 
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depending entirely on how you have your code structured,
possibly all you need to do is include
pack();
in the button code that makes it visible.
 
Ahmet Aksoy
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I tried pack(), validate(), invalidate() but it didn't help.
 
Michael Dunn
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works OK, doing it this way

 
Ahmet Aksoy
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Michael,
Thank you very much for the sample code.
I think the trick is setting "null".
I will try to implement it in my project.
Best regards.
Ahmet Aksoy
 
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