ACTIONLISTENER IN APPLETS

implements ActionListener
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class MainClass extends JPanel implements ActionListener
{
JTextField jtf = new JTextField(15);
public MainClass()
{
add(jtf);
jtf.addActionListener(this);
} // Show text when user presses ENTER.
public void actionPerformed(ActionEvent ae)
{
System.out.println(jtf.getText());
}
public static void main(String[] args)
{
JFrame frame = new JFrame();
frame.getContentPane().add(new MainClass());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(200, 200);
frame.setVisible(true);
}
}