GUI For Loop

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

import javax.swing.*;

public class mySelf2 {
    public mySelf2(){
        frame();
    }

    public void frame(){
        JFrame frame = new JFrame("Test");
        frame.setSize(500, 500);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        panel.setLayout(null);


        JButton btn = new JButton("This is a button");
        btn.setBounds(168, 150, 120, 35);
        btn.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent e){
                int i;
                for (i = 1; i < 6; i++){
                    JOptionPane.showMessageDialog(null, "Test " + i);
                }
            }
        });

        panel.add(btn);
        frame.add(panel);
    }

    public static void main(String args[]){
        new mySelf2();
    }

}