import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.event.*;
public class simplegui implements ActionListener{
JButton button;
public static void main(String[] args) {
simplegui gui=new simplegui();
gui.go(); }
public void go(){
JFrame Frame =new JFrame();
JButton button=new JButton("CLICE ME");
button.addActionListener(this);
Frame.getContentPane().add(button);
Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Frame.setSize(300,300);
Frame.setVisible(true);}
public void actionPerformed(ActionEvent event){
button.setText("I LOVE YOU");
}
}