learning java AWT EventQs

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;public class EventQs {
private Frame f = new Frame("event test");
private Button ok = new Button("confired");
private TextField tf = new TextField();
public void init(){
ok.addActionListener(new OkListener());
f.add(tf);
f.add(ok, BorderLayout.SOUTH);
f.pack();
f.setVisible(true);
} class OkListener implements ActionListener{
public void actionPerformed(ActionEvent e){
System.out.println("button be pressed");
tf.setText("hello panzidong"); }
}
public static void main(String[] args) {
new EventQs().init();
}
}