getPreferredSize() only called twice after pack()

Why does `getPreferredSize()` get called only twice when `pack()` is called on a `JFrame`, like in the following example: public class PackTest { static JFrame f = new JFrame(); @SuppressWarnings("serial") public static void main(String[] args) { f.add(new JPanel() { int i = 0; @Override public Dimension getPreferredSize() { System.out.println("getPreferredSize() called"); if(i++ >= 2) return new Dimension(200, 200); // This is never returned else return new Dimension(100, 100); } }); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.pack(); f.setVisible(true); for(int i = 0; i

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