import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JOptionPane;
public class Main {
public static void main(final String args[]) {
JButton button = new JButton("Test");
button.addActionListener(new ClickListener());
JOptionPane.showMessageDialog(null, button);
button.doClick();
}
}
class ClickListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.out.println("test");
}
}