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

public class EventTest extends JFrame implements ActionListener{
  private JButton testJButton;
  public EventTest(){
    super("Event Test");
    Container container = getContentPane();
    container.setLayout(new FlowLayout());
    testJButton = new JButton("JButton");
    testJButton.addActionListener(this);
    container.add(testJButton);
    setLocation(400, 300);
    //setVisible(true);
    setSize(200,72);
    setVisible(true);
  }

  public static void main(String[] args) {
    EventTest eventTest = new EventTest();
    eventTest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
  
  public void actionPerformed(ActionEvent event){
    JOptionPane.showMessageDialog(this, "JButton clicked");
  }  
}