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    <ul> <li><p>I can't see that <a href="http://docs.oracle.com/javase/7/docs/api/java/awt/CardLayout.html#show%28java.awt.Container,%20java.lang.String%29">Java7 show(Container parent, String name)</a> or <a href="http://docs.oracle.com/javase/6/docs/api/java/awt/CardLayout.html#show%28java.awt.Container,%20java.lang.String%29">Java6 show(Container parent, String name)</a> is depreciated</p></li> <li><p>depends if <code>currentCard</code> returns <code>String</code> from <code>cl.show(cardPanel, "" + (currentCard));</code></p></li> </ul> <p>EDIT (I tried your code example)</p> <p>1.you forgot to initialize most important variable </p> <pre><code>private CardLayout cardLayout = new CardLayout(); </code></pre> <p>2.then SSCCE could be </p> <pre><code>import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; public class CardLayoutTest extends JFrame { private static final long serialVersionUID = 1L; private JPanel cardPanel, jp1, jp2, buttonPanel; private JLabel jl1, jl2; private JButton btn1, btn2; private CardLayout cardLayout = new CardLayout(); public CardLayoutTest() { setTitle("Test med CardLayout"); setSize(400, 300); cardPanel = new JPanel(); buttonPanel = new JPanel(); cardPanel.setLayout(cardLayout); jp1 = new JPanel(); jp2 = new JPanel(); jl1 = new JLabel("Card 1"); jl2 = new JLabel("Card 2"); jp1.add(jl1); jp2.add(jl2); cardPanel.add(jp1, "1"); cardPanel.add(jp2, "2"); btn1 = new JButton("Show Card 1"); btn1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { cardLayout.show(cardPanel, "1"); } }); btn2 = new JButton("Show Card 2"); btn2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { cardLayout.show(cardPanel, "2"); } }); buttonPanel.add(btn1); buttonPanel.add(btn2); add(cardPanel, BorderLayout.NORTH); add(buttonPanel, BorderLayout.SOUTH); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { CardLayoutTest frame = new CardLayoutTest(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }); } } </code></pre>
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    1. POHow to show different cards in a CardLayout?
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    1. COThanks for the new code! It's working good! But I have some questions about some lines that you added, like this one: private static final long serialVersionUID = 1L; I can see that i removed a yellow alert triangle in Eclipse, but what is it doing? And you also replaced this line: getContentPane().add(cardPanel, BorderLayout.NORTH); whith this: add(cardPanel, BorderLayout.NORTH); whats the difference? And finally could you also be kind and explain what you have done in the main method? Thanks!
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