JRadioButton Events With ItemListener In Java Example

Chapter: Swing Last Updated: 08-07-2016 11:43:15 UTC

Program:

            /* ............... START ............... */
                
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 JavaJRadioButtonItemListener {

	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

Selected -> A
Deselected -> A
Selected -> B
Deselected -> B
Selected -> A
..........
JRadioButton Events With ItemListener In Java Example

Tags

JRadioButton Events With ItemListener, Swing, Java

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