Button action listener should implement abstract method

Wed May 30, 2012 7:43 am

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"