Class Main

import javax.swing.*;
import java.awt.event.*;
public class Main implements ActionListener {

 private static void createAndShowGUI() {
 // make frame..
 JFrame frame = new JFrame("I am a JFrame");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setBounds(20,30,300,100);
 frame.getContentPane().setLayout(null);
 // make a button
 JButton butt=new JButton("Click me");
 frame.getContentPane().add(butt);
 butt.setBounds(20, 20, 200,20);
//instantiate an application object
Main app = new Main();
// make the label
app.label = new JLabel("0 clicks");
app.label.setBounds(20,40, 200,20);

frame.getContentPane().add(app.label);

// set the application object to be the thing which
// listens to the button
butt.addActionListener(app);
frame.setVisible(true);
}
 public void actionPerformed(ActionEvent e)
 {
  // Ini akan dieksekusi ketika button diklik
  clickCount++;
  label.setText("Clicks = "+clickCount);
 }
  public static void main(String[] args) {
  // Memulai Swing GUI
  SwingUtilities.invokeLater(new Runnable() {
  public void run() {
  createAndShowGUI();
  }
  });
  }

 // application object fields
 int clickCount=0;
 JLabel label;
 }