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copied!<p>This is not an appropriate use of <code>updateUI()</code>, which "Resets the UI property to a value from the current look and feel." Using <code>revalidate()</code>, as suggested in a comment, would be helpful only if components are added to, or removed from, the enclosing <code>Container</code>. Instead, invoke <code>repaint()</code> directly on the sub-panel instance. For greater flexibility, use the observer pettern suggested <a href="https://stackoverflow.com/a/12613725/230513">here</a>.</p> <p>Addendum: This example use <a href="http://docs.oracle.com/javase/tutorial/uiswing/misc/action.html" rel="nofollow noreferrer"><code>Action</code></a> to encapsulate the button's behavior. Because the checkbox's selected state is a bound property, the component is repainted automatically, but you can invoke <code>repaint()</code> explicitly if needed.</p> <p>Addendum: Update to pass a reference as a parameter.</p> <p>Addendum: In this variation, the parameter is a reference to the exported <code>Action</code>.</p> <pre><code>import java.awt.EventQueue; import java.awt.GridLayout; import java.awt.event.ActionEvent; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.JButton; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JPanel; /** @see https://stackoverflow.com/a/14412516/230513 */ public class Example { private void display() { JFrame f = new JFrame("Example"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setLayout(new GridLayout(0, 1)); JPanel panel = new JPanel(); final JCheckBox check = new JCheckBox("Check"); Action checkAction = new AbstractAction("Update") { @Override public void actionPerformed(ActionEvent e) { check.setSelected(!check.isSelected()); } }; panel.add(check); f.add(panel); f.add(new SubPanel(checkAction)); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } private static class SubPanel extends JPanel { public SubPanel(final Action action) { this.add(new JButton(action)); } } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { new Example().display(); } }); } } </code></pre>

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