Swing: Welcher LayoutManager?

[JohnDoe21]

resize:
Habe ich bisher so gemacht

//mainClass
private void setGUI()
{
   c.fill = GridBagConstraints.BOTH;
   gridBag.setConstraints(mainPanel, c);
}

mainFrame.addComponentListener(new ResizeListener);

//private class ResizeListener

public void resized() //o.ä.
{
   setGUI();
}

MFG John