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POWhy does setSelected on JCheckBox lose effect?
 

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  1. POWhy does setSelected on JCheckBox lose effect?
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    <p>Can someone explain to me why I lost the selection (set by <code>setSelected()</code>) for <code>JCheckBox</code> when I put the <code>JOptionPane</code> into the <code>ItemListener</code>? Is this a bug ?</p> <p>It is curious, that if this process is delayed with <code>invokeLater()</code>, <code>setSelected()</code> works correctly as I expected.</p> <p><img src="https://i.stack.imgur.com/gGXHj.jpg" alt="enter image description here"> <img src="https://i.stack.imgur.com/FoFba.jpg" alt="enter image description here"></p> <p>from SSCCE</p> <pre><code>import javax.swing.*; import java.awt.*; import java.awt.event.*; public class ComponentEventDemo extends JPanel implements ComponentListener, ItemListener { private static final long serialVersionUID = 1L; private JFrame frame; private JTextArea display; private String newline = "\n"; private JTextField field1; public ComponentEventDemo() { super(new BorderLayout()); display = new JTextArea(10, 25); display.setEditable(false); JPanel panel = new JPanel(new GridLayout(0, 2)); field1 = new JTextField(); field1.setDisabledTextColor(Color.red); JCheckBox checkbox = new JCheckBox("Label visible", true); checkbox.addItemListener(this); panel.add(checkbox); panel.add(field1); panel.addComponentListener(this); JScrollPane scrollPane = new JScrollPane(display); frame = new JFrame("ComponentEventDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(scrollPane, BorderLayout.CENTER); frame.add(panel, BorderLayout.SOUTH); frame.addComponentListener(this); frame.setLocation(200, 200); frame.pack(); frame.setVisible(true); } public void itemStateChanged(ItemEvent evt) { System.out.println("STATE CHANGED!"); if (evt.getStateChange() == ItemEvent.SELECTED) { //javax.swing.SwingUtilities.invokeLater(new Runnable() { //public void run() { int returnVal = JOptionPane.showConfirmDialog(display, "Bla Bla Bla Text"); if (returnVal == JOptionPane.OK_OPTION) { field1.setText("SELECTED - OK btn"); } else if (returnVal == JOptionPane.NO_OPTION) { field1.setText("SELECTED - NO btn"); } else if (returnVal == JOptionPane.CANCEL_OPTION) { field1.setText("SELECTED - Cancel btn"); } else if (returnVal == JOptionPane.CLOSED_OPTION) { field1.setText("SELECTED - Close btn"); } //} //}); } else if (evt.getStateChange() == ItemEvent.DESELECTED) { field1.setText("DESELECTED"); } } protected void displayMessage(String message) { display.append(message + newline); display.setCaretPosition(display.getDocument().getLength()); } public void componentHidden(ComponentEvent e) { displayMessage(e.getComponent().getClass().getName() + " ---&gt; Hidden"); } public void componentMoved(ComponentEvent e) { displayMessage(e.getComponent().getClass().getName() + " ---&gt; Moved"); } public void componentResized(ComponentEvent e) { displayMessage(e.getComponent().getClass().getName() + " ---&gt; Resized "); } public void componentShown(ComponentEvent e) { displayMessage(e.getComponent().getClass().getName() + " ---&gt; Shown"); } public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { ComponentEventDemo ced = new ComponentEventDemo(); } }); } } </code></pre>
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    1. CO1+ question. I've seen this before and have solved it as you have -- by queuing the display of the JOptionPane on the EDT, but I can't explain it as I've not had time or energy to slog through the source code yet.
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    2. CO@Hovercraft Full Of Eels I debug that inside Java API methods, before I posting this question here, everything looks like correctly, notifier is done inside this method in both cases, still I can't found difference betweens (steps inside Java method) plain JCheckBox and JCheckBox with JOptionPane, thanks for your comfirmation
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