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    <p>Here's an example using the <a href="http://en.wikipedia.org/wiki/Observer_pattern" rel="nofollow noreferrer"><em>observer pattern</em></a>, also seen <a href="https://stackoverflow.com/a/3072979/230513">here</a>, <a href="https://stackoverflow.com/a/9346946/230513">here</a> and <a href="https://stackoverflow.com/a/11832979/230513">here</a>. Note that it would also be possible to listen to the combo's model.</p> <p><img src="https://i.stack.imgur.com/sgH2U.png" alt="enter image description here"></p> <pre><code>import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import javax.swing.*; /** * @see http://en.wikipedia.org/wiki/Observer_pattern * @see https://stackoverflow.com/a/10523401/230513 */ public class PropertyChangeDemo { public PropertyChangeDemo() { JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setResizable(false); f.add(new ObserverPanel()); f.pack(); f.setLocationByPlatform(true); f.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { PropertyChangeDemo example = new PropertyChangeDemo(); } }); } } class ObserverPanel extends JPanel { private JLabel title = new JLabel("Value received: "); private JLabel label = new JLabel("null", JLabel.CENTER); public ObserverPanel() { this.setBorder(BorderFactory.createTitledBorder("ObserverPanel")); JPanel panel = new JPanel(new GridLayout(0, 1)); panel.add(title); panel.add(label); this.add(panel); ObservedPanel observed = new ObservedPanel(); observed.addPropertyChangeListener(new PropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent e) { if (e.getPropertyName().equals(ObservedPanel.PHYSICIST)) { String value = e.getNewValue().toString(); label.setText(value); } } }); this.add(observed); } } class ObservedPanel extends JPanel { public static final String PHYSICIST = "Physicist"; private static final String[] items = new String[]{ "Alpher", "Bethe", "Gamow", "Dirac", "Einstein" }; private JComboBox combo = new JComboBox(items); private String oldValue; public ObservedPanel() { this.setBorder(BorderFactory.createTitledBorder("ObservedPanel")); combo.addActionListener(new ComboBoxListener()); this.add(combo); } private class ComboBoxListener implements ActionListener { @Override public void actionPerformed(ActionEvent ae) { String newValue = (String) combo.getSelectedItem(); firePropertyChange(PHYSICIST, oldValue, newValue); oldValue = newValue; } } } </code></pre>
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    1. COI better understand how firePropertyChange propogates, thank you. Not quite sure how you passed actual values around, need to read again, but this was the missing piece for me.
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    2. COHere's a related [example](http://stackoverflow.com/a/11832979/230513) that uses a modeless dialog.
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