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    <p>Here is the <a href="http://sscce.org/" rel="nofollow">SSCCE</a>.</p> <p>1) For continuous increase/decrease of size, you should look for some animation API.</p> <p>or</p> <p>2) If isn't there any background task with output to the GUI, you can to pause while sizing the <code>JFrame</code>. In that case, you would delay the increase/decrease by using <code>Thread#sleep(int)</code> wrapped into <code>Runnable</code> thread.</p> <p>3) Notice (not for OP) using <code>Thread#sleep(int)</code> directly during EDT would be freeze GUI until the delay ended.</p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.border.Border; //based on HFOE http://stackoverflow.com/questions/5414177/change-size-of-jpanel-using-cardlayout/5414770#5414770 public class MultiSizedPanels { private static void createAndShowUI() { final CardLayout cardLayout = new CardLayout(); final JPanel cardHolder = new JPanel(cardLayout); final JFrame frame = new JFrame("MultiSizedPanels"); JLabel[] labels = { new JLabel("Small Label", SwingConstants.CENTER), new JLabel("Medium Label", SwingConstants.CENTER), new JLabel("Large Label", SwingConstants.CENTER)}; for (int i = 0; i &lt; labels.length; i++) { int padding = 50; Dimension size = labels[i].getPreferredSize(); size = new Dimension(size.width + 2 * (i + 1) * padding, size.height + 2 * (i + 1) * padding); labels[i].setPreferredSize(size); Border lineBorder = BorderFactory.createLineBorder(Color.blue); labels[i].setBorder(lineBorder); JPanel containerPanel = new JPanel(); if (i == 1) { containerPanel.setPreferredSize(new Dimension(300, 200)); containerPanel.add(labels[i], BorderLayout.CENTER); cardHolder.add(containerPanel, String.valueOf(i)); } else if (i == 2) { containerPanel.setPreferredSize(new Dimension(600, 400)); containerPanel.add(labels[i], BorderLayout.CENTER); cardHolder.add(containerPanel, String.valueOf(i)); } else { containerPanel.setPreferredSize(new Dimension(800, 600)); containerPanel.add(labels[i], BorderLayout.CENTER); cardHolder.add(containerPanel, String.valueOf(i)); } } JButton nextButton = new JButton("Next"); nextButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { cardLayout.next(cardHolder); Dimension dim = new Dimension(); for (Component comp : cardHolder.getComponents()) { if (comp.isVisible() == true) { dim = comp.getPreferredSize(); } } frame.setPreferredSize(dim); java.awt.EventQueue.invokeLater(new Runnable() { public void run() { frame.pack(); } }); } }); JPanel btnHolder = new JPanel(); btnHolder.add(nextButton); frame.add(cardHolder, BorderLayout.CENTER); frame.add(btnHolder, BorderLayout.SOUTH); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setLocation(150, 150); frame.setVisible(true); } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { createAndShowUI(); } }); } } </code></pre>
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    1. POHow to set a JFrame size to fit the CardLayout displayed JPanel?
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    1. CO-1 for excessive use of setPrefSize: the general rule is (as you well know :-) to solver sizing problems by using an appropriate LayoutManager. If you don't find one that's doing what you want, write/adjust a LayoutManager that does ...
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