In this example we are going to see how to use JRadioButton bundled with an ItemListener.
Java Code:
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import java.awt.GridLayout; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import javax.swing.AbstractButton; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; public class Main { public static void main(String args[]) { JFrame frame = new JFrame("JRadio Button Grouping Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel panel = new JPanel(new GridLayout(0, 1)); ButtonGroup group = new ButtonGroup(); JRadioButton aRadioButton = new JRadioButton("A"); JRadioButton bRadioButton = new JRadioButton("B"); ItemListener itemListener = new ItemListener() { String lastSelected; public void itemStateChanged(ItemEvent itemEvent) { AbstractButton aButton = (AbstractButton) itemEvent.getSource(); int state = itemEvent.getStateChange(); String label = aButton.getText(); String msgStart; if (state == ItemEvent.SELECTED) { if (label.equals(lastSelected)) { msgStart = "Reselected -> "; } else { msgStart = "Selected -> "; } lastSelected = label; } else { msgStart = "Deselected -> "; } System.out.println(msgStart + label); } }; panel.add(aRadioButton); group.add(aRadioButton); panel.add(bRadioButton); group.add(bRadioButton); aRadioButton.addItemListener(itemListener); bRadioButton.addItemListener(itemListener); frame.add(panel); frame.setSize(300, 200); frame.setVisible(true); } } /* ............... END ............... */ |
Output:
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Selected -> B Deselected -> B Selected -> A Deselected -> A Selected -> B |
