Main.java

public class Main {
    public static void main(String[] args) {
        new MyFrame();
    }
}

MyFrame.java

import java.io.IOException;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JButton;

public class MyFrame extends JFrame implements ActionListener {
    public MyFrame() {
        super("MyFrame");
        getContentPane().setLayout(new FlowLayout());
        getContentPane().add(new JLabel("Thread-Per-Message Sample"));
        JButton button = new JButton("Execute");
        getContentPane().add(button);
        button.addActionListener(this);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setVisible(true);
    }
    public void actionPerformed(ActionEvent e) {
        Service.service();
    }
}

Service.java

public class Service {
    public static void service() {
        System.out.print("service");
        for (int i = 0; i < 50; i++) {
            System.out.print(".");
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
            }
        }
        System.out.println("done.");
    }
}