title: Action Listener error
body: <p>I keep getting an error when I implement the ActionListener. I dont really understand how to fix it. I did the actionPerformed (ActionEvent ev) {} and put my login button to call it with lg.addActionListener(this);</p>
  
  <pre><code>import java.awt.*;
  import javax.swing.*;
  import java.awt.Event.*;
  import java.applet.Applet;
  
  public class LoginScreen extends JApplet implements ActionListener   {
      JTextField un;
      JPasswordField pw;
      JButton lg;
      JLabel user,pass;
  
      public LoginScreen () {
          un = new JTextField ();
          pw = new JPasswordField ();
          lg = new JButton ("login");
          user = new JLabel ("username");
          pass = new JLabel ("password");
  
          lg.addActionListener(this);
  
          this.setLayout(null);
  
          user.setBounds(10, 10, 120, 20);
          pass.setBounds(10, 30, 120, 20);
          un.setBounds(140, 10, 200, 20);
          pw.setBounds(140, 30, 200, 20);
  
          lg.setBounds(140, 55, 100, 20);
  
          this.add(user);
          this.add(pass);
          this.add(un);
          this.add(pw);
          this.add(lg);
  
          this.setSize(500, 300);
          this.setVisible(true);
          }       
      public void actionPerformed(ActionEvent ev) {
  
      }
  }
  </code></pre>