How to fix the size of a multiple panels in jFrame

Hi,
In Jframe I added one rootPanel
Inside rootPanel, I added two more panels
1. userInputPanel which intern contains one textField & one jLabel
2. buttonPanel which intern consists of two buttons
So I need to view, always userInputPanel top side and buttonPanel below to the userInputPanel.
But when I click on any button, the buttonPanel goes up (on top) of userInputPanel.
any solution?
Thanks
-ms_shitole

In Jframe I added one rootPanelI don't know what a rootPanel is or why you think you need to add one.
The general code should probably be something like:
frame.add(userPanel, BorderLayout.CENTER);
frame.add(buttonPanel, BorderLayout.SOUTH);
frame.pack();Read the section from the Swing tutorial on [Using Layout Managers|http://java.sun.com/docs/books/tutorial/uiswing/TOC.html] for more information and working examples.
For more help create a [SSCCE (Short, Self Contained, Compilable and Executable, Example Program)|http://sscce.org], that demonstrates the incorrect behaviour.
Don't forget to use the Code Formatting Tags so the posted code retains its original formatting. That is done by selecting the code and then clicking on the "Code" button above the question input area.

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