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    <p>Normally the <code>add</code> call is sufficient. </p> <p>Note: a <code>BorderLayout</code> can only contain one component in each location. So if you add another component in the <code>NORTH</code> location, your button will not be visible.</p> <p>Second note: by default a <code>JPanel</code> does not have a <code>BorderLayout</code> but a <code>FlowLayout</code>. Have you set a <code>BorderLayout</code> on that specific panel ? Otherwise the <code>BorderLayout#NORTH</code> constraint is incorrect</p> <p>All the <code>validate</code>,<code>revalidate</code>,<code>repaint</code> calls can be removed</p> <p><strong>Edit</strong></p> <p>It seems some sort of validation is needed after all. I was under the impression that Swing should be smart enough to listen for the event when something is added to a <code>Container</code>, and update whatever is necessary (a bit similar to updating a <code>TableModel</code> updates the <code>JTable</code> based on events, without the need to call <code>repaint</code> or the likes on the <code>JTable</code>).</p> <p>However, when trying this in an SSCCE, I came to the following code (different versions, only post the most elaborate version)</p> <ul> <li>without the scroll-pane, the <code>validate</code> calls seem to have no effect. I actually need to call <code>pack</code> again to make the new labels visible (not included in the SSCCE, but removing the scrollpane from the code is trivial)</li> <li><p>with the scroll-pane, the <code>validate</code> call has an effect</p> <pre><code>import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; import java.awt.BorderLayout; import java.awt.Container; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class AddLabelsAtRuntime { private int fLabelCounter = 0; private JPanel fLabelPanel; private final JFrame fTestFrame; public AddLabelsAtRuntime() { fLabelPanel = new JPanel( ); BoxLayout boxLayout = new BoxLayout( fLabelPanel, BoxLayout.PAGE_AXIS ); fLabelPanel.setLayout( boxLayout ); fTestFrame = new JFrame( "Dynamically add labels" ); } private JFrame createUI(){ Container contentPane = fTestFrame.getContentPane(); contentPane.setLayout( new BorderLayout() ); JScrollPane scrollPane = new JScrollPane( fLabelPanel ); scrollPane.setPreferredSize( new Dimension( 200, 200 ) ); contentPane.add( scrollPane, BorderLayout.CENTER ); contentPane.add( createButtonPanel(), BorderLayout.SOUTH ); fTestFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); fTestFrame.pack(); return fTestFrame; } private void addLabel(){ fLabelPanel.add( new JLabel( "Label " + ++fLabelCounter ) ); } private JPanel createButtonPanel(){ JPanel buttonPanel = new JPanel( ); BoxLayout boxLayout = new BoxLayout( buttonPanel, BoxLayout.LINE_AXIS ); buttonPanel.setLayout( boxLayout ); JButton validateButton = new JButton( "Add + validate" ); validateButton.addActionListener( new ActionListener() { @Override public void actionPerformed( ActionEvent e ) { addLabel(); fLabelPanel.validate(); fTestFrame.validate(); } } ); buttonPanel.add( validateButton ); JButton noValidateButton = new JButton( "Add" ); noValidateButton.addActionListener( new ActionListener() { @Override public void actionPerformed( ActionEvent e ) { addLabel(); } } ); buttonPanel.add( noValidateButton ); JButton packButton = new JButton( "Add + pack" ); packButton.addActionListener( new ActionListener() { @Override public void actionPerformed( ActionEvent e ) { addLabel(); fTestFrame.pack(); } } ); buttonPanel.add( packButton ); return buttonPanel; } public static void main( String[] args ) { EventQueue.invokeLater( new Runnable() { @Override public void run() { AddLabelsAtRuntime addLabelsAtRuntime = new AddLabelsAtRuntime(); addLabelsAtRuntime.createUI().setVisible( true ); } } ); } } </code></pre></li> </ul>
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    1. POHow to Dynamically Add JButton to JPanel?
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    1. COI generally find it necessary to call `validate()` - as when adding labels in the example linked above. Can you provide an SSCCE that adds components dynamically and does not require it?
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    2. COI will give it a try tonight, but I do not remember ever needing it
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    3. COLook forward to seeing the code. +1 for the comment on `BorderLayout.NORTH`
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