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copied!<ul> <li><p>great lesson, how the <code>LayoutManager</code> works, only <code>GridLayout</code> can do that without any issue, but this is its property</p></li> <li><p>last <code>JComponent</code> in the row or column (part of then is about) <code>can't be invisible</code>, then container is shrinked </p></li> <li><p>easiest work_around is to display container, then to call <code>setVisible(false)</code> wrapped into <code>invokeLater</code></p></li> </ul> <p><img src="https://i.stack.imgur.com/O1RJp.jpg" alt="enter image description here"> ... .... <img src="https://i.stack.imgur.com/C7V25.jpg" alt="enter image description here"></p> <pre><code>import java.awt.event.ItemEvent; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; public class Evaluator { private JFrame frame = new JFrame(); private JPanel panel = new JPanel(); private JCheckBox checkBox = new JCheckBox(); private JTextField textField = new JTextField(10); public Evaluator() { checkBox.setText("Properties"); checkBox.addItemListener(new java.awt.event.ItemListener() { @Override public void itemStateChanged(java.awt.event.ItemEvent evt) { if (evt.getStateChange() == ItemEvent.SELECTED) { textField.setVisible(true); } else { textField.setVisible(false); } } }); //panel.setLayout(new GridLayout()); //panel.setLayout(new SpringLayout()); //panel.setLayout(new BorderLayout()); //panel.setLayout(new GridBagLayout()); //panel.setLayout(new BoxLayout(panel, BoxLayout.LINE_AXIS)); panel.add(checkBox/*, BorderLayout.NORTH*/); panel.add(textField/*, BorderLayout.SOUTH*/); //panel.doLayout(); //textField.setVisible(false); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(panel); frame.pack(); frame.setVisible(true); java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { textField.setVisible(false); } }); } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { Evaluator evaluator = new Evaluator(); } }); } } </code></pre>

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