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    <p>You haven't posted how you call your constructor, so maybe there is something there. I slightly modified your code, added a <code>main</code> method and it seems to work ok. Take a look at it:</p> <pre><code>import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Vector; import javax.swing.BoxLayout; import javax.swing.ButtonGroup; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.SwingUtilities; public class RadioDemo implements ActionListener { String buttonName; JPanel radioPanel = new JPanel(); ButtonGroup group = new ButtonGroup(); int result; JRadioButton birdButton[]; Vector&lt;String&gt; listName; private JRadioButton selectedButton; public RadioDemo(Vector&lt;String&gt; listName) { birdButton = new JRadioButton[listName.size()]; this.listName = listName; int i = 0; for (String buttonName : listName) { birdButton[i] = new JRadioButton(buttonName); if (i == 0) { birdButton[i].setSelected(true); selectedButton = birdButton[i]; } birdButton[i].setActionCommand(buttonName); group.add(birdButton[i]); birdButton[i].addActionListener(this); radioPanel.add(birdButton[i]); i++; } radioPanel.setLayout(new BoxLayout(radioPanel, BoxLayout.Y_AXIS)); // birdButton.setBorder(BorderFactory.createEmptyBorder(5,5,5,5)); result = JOptionPane.showConfirmDialog(null, radioPanel, "Please choose", JOptionPane.OK_CANCEL_OPTION); show(); } /** Listens to the radio buttons. */ @Override public void actionPerformed(ActionEvent e) { JRadioButton rb = (JRadioButton) e.getSource(); System.err.println(rb.getText() + " is selected"); selectedButton = rb; } public void show() { if (result == JOptionPane.OK_OPTION) { System.err.println(selectedButton.getText() + " is selected and approved"); } } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { Vector&lt;String&gt; buttonNames = new Vector&lt;String&gt;(); buttonNames.add("Show"); buttonNames.add("Something"); buttonNames.add("Else"); buttonNames.add("Beep"); new RadioDemo(buttonNames); } }); } } </code></pre>
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    1. POwhy JRadioButton is not selected even by using setSelected(true)
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    1. USGuillaume Polet
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    1. POwhy JRadioButton is not selected even by using setSelected(true)
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    1. COthank you very much for this actually i was calling constructor by anonymous way thats why it was not working. then i store it into reference variable it works
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