import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class Test extends JFrame {
    public static void main(String[] args) {
        Test app = new Test();
        app.setVisible(true);
    }

    public Test() {
        JButton radioWindowBtn = new JButton("Show Window");
        radioWindowBtn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                displayWindow();
            }
        });
        getContentPane().add(radioWindowBtn);
    }

    protected void displayWindow() {
        JFrame frame = new JFrame();
        JRadioButton oneRadioBtn = new JRadioButton("One");
        JRadioButton twoRadioBtn = new JRadioButton("Two");

        oneRadioBtn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                JRadioButton target = (JRadioButton)e.getSource();
                if (target.isSelected()) {
                    System.out.println("One is selected");
                }
            }
        });
        twoRadioBtn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                JRadioButton target = (JRadioButton)e.getSource();
                if (target.isSelected()) {
                    System.out.println("Two is selected");
                }
            }
        });

        JPanel panel = new JPanel();
        panel.add(oneRadioBtn);
        panel.add(twoRadioBtn);

        frame.getContentPane().add(panel);
        frame.setVisible(true);
    }
}