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

public class Recursion extends JFrame {

    public static void main(String[] args) {
        JFrame frame = new Recursion();
        frame.show();
    }

    public Recursion() {
        setTitle("Recursion");
        setLocation(150, 150);
        setSize(410, 200);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        Container pane = getContentPane();
        Rec r = new Rec();
        pane.add(r);
    }
}