package swing;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
public class RadioButtonTest {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
RadioButtonFrame frame = new RadioButtonFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
class RadioButtonFrame extends JFrame {
public RadioButtonFrame() {
this.setTitle("RadioButton Test");
this.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
label = new JLabel("The quick brown fox jumps over the lazy dog.");
label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));
this.add(label, BorderLayout.CENTER);
buttonPanel = new JPanel();
group = new ButtonGroup();
addRadioButton("Small", 8);
addRadioButton("Medium", 12);
addRadioButton("Large", 18);
addRadioButton("Extra large", 36);
this.add(buttonPanel, BorderLayout.SOUTH);
}
private void addRadioButton(String name, final int size) {
boolean selected = size == DEFAULT_SIZE;
JRadioButton button = new JRadioButton(name, selected);
group.add(button);
buttonPanel.add(button);
ActionListener listener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent event) {
label.setFont(new Font("Serif", Font.PLAIN, size));
}
};
button.addActionListener(listener);
}
public static final int DEFAULT_WIDTH = 400;
public static final int DEFAULT_HEIGHT = 200;
private JPanel buttonPanel;
private ButtonGroup group;
private JLabel label;
private static final int DEFAULT_SIZE = 12;
}