StackOverflow2013

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copied!<p>You need to attach an <code>ItemListener</code> to your combo box. On change, you need to determine the selected item (<code>JComboBox.getSelectedItem</code> or <code>JComboBox.getSelectedIndex</code>) and update the image as required...</p> <p>You can also use you existing <code>ActionListener</code> instead</p> <p><img src="https://i.stack.imgur.com/fzFJN.png" alt="enter image description here"> <img src="https://i.stack.imgur.com/hXj3j.png" alt="enter image description here"></p> <pre><code>public class SwitchPicture { public static final String[] IMAGES = new String[]{ "path/to/your/first/image", "path/to/your/second/image" }; public static void main(String[] args) { new SwitchPicture(); } public SwitchPicture() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException ex) { } catch (InstantiationException ex) { } catch (IllegalAccessException ex) { } catch (UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(new SwitcherPane()); frame.pack(); frame.setVisible(true); } }); } protected class SwitcherPane extends JPanel { private BufferedImage[] images; private JLabel lblBackground; private JComboBox comboBox; public SwitcherPane() { try { images = new BufferedImage[2]; for (int index = 0; index < 2; index++) { images[index] = ImageIO.read(new File(IMAGES[index])); } } catch (IOException ex) { ex.printStackTrace();; } setLayout(new BorderLayout()); lblBackground = new JLabel(); lblBackground.setIcon(new ImageIcon(images[0])); add(lblBackground); comboBox = new JComboBox(); comboBox.getSelectedItem() // I did this because the images where so large // you couldn't see the combo box :P comboBox.setFont(comboBox.getFont().deriveFont(48f)); DefaultComboBoxModel<String> model = new DefaultComboBoxModel<>(); model.addElement("Happy"); model.addElement("Happier"); comboBox.setModel(model); comboBox.setSelectedIndex(0); lblBackground.setLayout(new GridBagLayout()); lblBackground.add(comboBox); comboBox.addItemListener(new ItemListener() { @Override public void itemStateChanged(ItemEvent e) { lblBackground.setIcon(new ImageIcon(images[comboBox.getSelectedIndex()])); } }); } } } </code></pre>

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