@KT:Listing 1: SwingGui.java
@LI:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SwingGui {

  private final int WINDOW_WIDTH=300, WINDOW_HEIGHT=200;
  private JFrame      iMainWindow;
  private JPanel      iInputPanel;
  private JLabel      iLabel;
  private JTextArea   iTextArea;
  private JTextField  iTextField;
  private JButton     iButton;

   public SwingGui() {
     iMainWindow = new JFrame("Swing-Example");
     iMainWindow.addWindowListener(
       new WindowAdapter() {
         public void windowClosing(WindowEvent e) {
           exit();
         }
     });
   }

  private void createGUI() {
     iMainWindow.getContentPane().setLayout
	(new GridLayout(2,1,0,5));
     iTextArea = new JTextArea();
     createPanel();
     iMainWindow.getContentPane().add(iTextArea);
     iMainWindow.getContentPane().add(iInputPanel);
     iMainWindow.setJMenuBar(createMenuBar());
  }

  private void createPanel() {
    iInputPanel = new JPanel();
    iInputPanel.setLayout(new FlowLayout());
    iLabel     = new JLabel("Text: ");
    iTextField = new JTextField(10);
    iButton    = new JButton("Add");
    iInputPanel.add(iLabel);
    iInputPanel.add(iTextField);
    iInputPanel.add(iButton);

    iButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
         iTextArea.append(iTextField.getText());
         iTextArea.append("\n");
        }
      }
    );
  }

   private JMenuBar createMenuBar() {
     JMenuBar  mb   = new JMenuBar();
     JMenu     fileMenu = new JMenu("File");
     JMenu     helpMenu = new JMenu("Help");
     JMenuItem exitItem = new JMenuItem("Exit");
     JMenuItem aboutItem = new JMenuItem("About...");

     mb.add(fileMenu);
     mb.add(helpMenu);
     fileMenu.add(exitItem);
     helpMenu.add(aboutItem);

     exitItem.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
           exit();
         }
       }
     );
     aboutItem.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
           about();
         }
       }
     );
     return mb;
   }

   private void show() {
     iMainWindow.setSize(WINDOW_WIDTH,WINDOW_HEIGHT);
     Dimension screenSize = 
       Toolkit.getDefaultToolkit().getScreenSize();
     iMainWindow.setLocation  
        ((screenSize.width - WINDOW_WIDTH)/2,
        (screenSize.height - WINDOW_HEIGHT)/2);
     iMainWindow.setVisible(true);
     iMainWindow.show();
     iTextField.requestFocus();
   }

   void exit() {
     iMainWindow.setVisible(false);
     iMainWindow.dispose();
     System.exit(0);
   }

   void about() {
     JOptionPane.showMessageDialog(iMainWindow,
        "Swing-Example class: " + 
	 SwingGui.class.getName(),
        "About Swing-Example", 
	JOptionPane.INFORMATION_MESSAGE);
   }

   public static void main(String argv[]) {
     SwingGui main = new SwingGui();
     main.createGUI();
     main.show();
   }
 }