React Radio button event
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
public class RadioButtonTest extends JFrame implements ActionListener {
JLabel label = new JLabel("The quick brown fox jumps over the lazy dog.");
private JRadioButton smallButton;
private JRadioButton mediumButton;
private JRadioButton largeButton;
private JRadioButton xlargeButton;
public RadioButtonTest() {
setTitle("RadioButtonTest");
setSize(400, 200);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
JPanel buttonPanel = new JPanel();
ButtonGroup group = new ButtonGroup();
smallButton = addRadioButton(buttonPanel, group, "Small", false);
mediumButton = addRadioButton(buttonPanel, group, "Medium", true);
largeButton = addRadioButton(buttonPanel, group, "Large", false);
xlargeButton = addRadioButton(buttonPanel, group, "Extra large", false);
getContentPane().add(buttonPanel, "South");
getContentPane().add(label, "Center");
}
public JRadioButton addRadioButton(JPanel buttonPanel, ButtonGroup g,
String buttonName, boolean v) {
JRadioButton button = new JRadioButton(buttonName, v);
button.addActionListener(this);
g.add(button);
buttonPanel.add(button);
return button;
}
public void actionPerformed(ActionEvent evt) {
Object source = evt.getSource();
if (source == smallButton)
label.setFont(new Font("SansSerif", Font.PLAIN, 8));
else if (source == mediumButton)
label.setFont(new Font("SansSerif", Font.PLAIN, 12));
else if (source == largeButton)
label.setFont(new Font("SansSerif", Font.PLAIN, 14));
else if (source == xlargeButton)
label.setFont(new Font("SansSerif", Font.PLAIN, 18));
}
public static void main(String[] args) {
JFrame frame = new RadioButtonTest();
frame.show();
}
}
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