Button action listener should implement abstract method

Code:

//Import packages
    import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
//main class
public class FirstGUI {
    //Declare variables
            static JFrame frame1;
            static Container pane;
            static JButton btnConnect, btnDisconnect;
            static JLabel lblServer, lblUsername, lblPassword, lblPort;
            static JTextField txtServer, txtUsername, txtPassword, txtPort;
            static Insets insets;}
    public static void main(String[] args) {
         //Create the frame
                    frame1 = new JFrame ("Sample GUI Application");
                //Set its size to 800x200 pixels
                    frame1.setSize (800,200);
                    //Prepare panel
                    pane = frame1.getContentPane();
                    insets = pane.getInsets();
                    //Apply the null layout
                    pane.setLayout (null);
    btnConnect = new JButton ("Connect");
        btnDisconnect = new JButton ("Disconnect");
        lblServer = new JLabel ("Remote host:");
        lblUsername = new JLabel ("Username:");
        lblPassword = new JLabel ("Password:");
        lblPort = new JLabel ("Port #:");
        txtServer = new JTextField (10);
        txtUsername = new JTextField  (10);
        txtPassword = new JTextField  (10);
            txtPort = new JTextField  (5);
    pane.add (lblServer); //Add component to panel
        lblServer.setBounds (insets.left + 5, insets.top + 5, lblServer.getPreferredSize().width, lblServer.getPreferredSize().height);
        //Add all components to panel
            pane.add (lblServer);
            pane.add (lblUsername);
            pane.add (lblPassword);
            pane.add (lblPort);
            pane.add (txtServer);
            pane.add (txtUsername);
            pane.add (txtPassword);
            pane.add (txtPort);
            pane.add (btnConnect);
            pane.add (btnDisconnect);
             
            //Place all components
            lblServer.setBounds (insets.left + 5, insets.top + 5, lblServer.getPreferredSize().width, lblServer.getPreferredSize().height);
            txtServer.setBounds (lblServer.getX() + lblServer.getWidth() + 5, insets.top + 5, txtServer.getPreferredSize().width, txtServer.getPreferredSize().height);
             
            lblUsername.setBounds (txtServer.getX() + txtServer.getWidth() + 5, insets.top + 5, lblUsername.getPreferredSize().width, lblUsername.getPreferredSize().height);
            txtUsername.setBounds (lblUsername.getX() + lblUsername.getWidth() + 5, insets.top + 5, txtUsername.getPreferredSize().width, txtUsername.getPreferredSize().height);
             
            lblPassword.setBounds (txtUsername.getX() + txtUsername.getWidth() + 5, insets.top + 5, lblPassword.getPreferredSize().width, lblPassword.getPreferredSize().height);
            txtPassword.setBounds (lblPassword.getX() + lblPassword.getWidth() + 5, insets.top + 5, txtPassword.getPreferredSize().width, txtPassword.getPreferredSize().height);
             
            lblPort.setBounds (txtPassword.getX() + txtPassword.getWidth() + 5, insets.top + 5, lblPort.getPreferredSize().width, lblPort.getPreferredSize().height);
            txtPort.setBounds (lblPort.getX() + lblPort.getWidth() + 5, insets.top + 5, txtPort.getPreferredSize().width, txtPort.getPreferredSize().height);
         
            btnConnect.setBounds (txtPort.getX() + txtPort.getWidth() + 5, insets.top + 5, btnConnect.getPreferredSize().width, btnConnect.getPreferredSize().height);
         
            //Place disconnect button (start a new line!)
            btnDisconnect.setBounds (insets.left + 15, lblServer.getY() + lblServer.getHeight() + 5, btnDisconnect.getPreferredSize().width, btnDisconnect.getPreferredSize().height);
            frame1.setVisible (true);
            //Set Look and Feel
            try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}
                catch (ClassNotFoundException e) {}
                catch (InstantiationException e) {}
                catch (IllegalAccessException e) {}
                catch (UnsupportedLookAndFeelException e) {}
            btnConnect.addActionListener(new btnConnectAction()); //Register action
            public static class btnConnectAction implements ActionListener{
                public static class btnConnectAction implements ActionListener{
                            public void actionPerformed (ActionEvent e){
                            System.out.println("You entered "+txtUsername.getText());
            }
    }
} 

I did not understand whats the problem with this code every time it says"The type btnConnectAction must implement the inherited abstract method ActionListener.actionPerformed(ActionEvent)"or"The nested type btnConnectAction cannot hide an enclosing type"

Author: Samyak

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