我这代码有什么问题吗，为什么点击按钮不能从click me变成 I LOVE YOU，求解

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");
}
}

有帮助的话，希望你能够采纳支持一下，谢谢！

public class simplegui implements ActionListener {
    JButton button = new JButton("CLICE ME");

    public static void main(String[] args) {
        simplegui gui = new simplegui();
        gui.go();
    }

    public void go() {
        JFrame Frame = new JFrame();
        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");
    }
}