import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;


public class SimpleWindow extends JFrame {

    public SimpleWindow() {
        super ("A window");
        JButton b = new JButton("Click");
        b.addActionListener( new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e) {
                new SimpleWindow();

            }

        });
        setLayout(new FlowLayout());
        getContentPane().add(b);
        setSize(200, 200);
        setVisible(true);
    }

    public static void main(String[] args) {
        new SimpleWindow();

    }

}