import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.WindowConstants;
public class Main extends JFrame {
private JRadioButton small, medium, large;
private JButton button;
public Main(String title) {
super(title);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
Container contentPane = this.getContentPane();
ButtonGroup group = new ButtonGroup();
small = new JRadioButton("small");
medium = new JRadioButton("medium");
large = new JRadioButton("large");
group.add(small);
group.add(medium);
group.add(large);
button = new JButton("Click here.");
button.setBounds(100, 50, 100, 50);
JPanel center = new JPanel();
center.setLayout(null);
center.add(button);
contentPane.add(center, BorderLayout.CENTER);
JPanel north = new JPanel();
north.add(small);
north.add(medium);
north.add(large);
contentPane.add(north, BorderLayout.NORTH);
ChangeSize listener = new ChangeSize(button);
small.addItemListener(listener);
medium.addItemListener(listener);
large.addItemListener(listener);
}
public static void main(String[] args) {
JFrame f = new Main("JRadioButtonDemo");
f.setSize(300, 200);
f.setVisible(true);
}
}
class ChangeSize implements ItemListener {
private Component component;
public ChangeSize(Component c) {
component = c;
}
public void itemStateChanged(ItemEvent e) {
String size = (String) e.getItem();
if (size.equals("small")) {
component.setSize(75, 20);
} else if (size.equals("medium")) {
component.setSize(100, 50);
} else if (size.equals("large")) {
component.setSize(150, 75);
}
}
}