程序在jbuilder的欢迎工程界面的基础上改进的，代码看起来有点费劲，
其中DiaryApp是程序的主类，日记本的主要操作在类DiaryFrame中实现。

文件DiaryApp.java：
/**
* Copyright (c) 1996-2002 Borland Software Corporation. All Rights Reserved.
*
* This SOURCE CODE FILE, which has been provided by Borland Software as part
* of a Borland Software product for use ONLY by licensed users of the product,
* includes CONFIDENTIAL and PROPRIETARY information of Borland Software.  
*
* USE OF THIS SOFTWARE IS GOVERNED BY THE TERMS AND CONDITIONS
* OF THE LICENSE STATEMENT AND LIMITED WARRANTY FURNISHED WITH
* THE PRODUCT.
*
* IN PARTICULAR, YOU WILL INDEMNIFY AND HOLD BORLAND SOFTWARE, ITS
* RELATED COMPANIES AND ITS SUPPLIERS, HARMLESS FROM AND AGAINST ANY
* CLAIMS OR LIABILITIES ARISING OUT OF THE USE, REPRODUCTION, OR
* DISTRIBUTION OF YOUR PROGRAMS, INCLUDING ANY CLAIMS OR LIABILITIES
* ARISING OUT OF OR RESULTING FROM THE USE, MODIFICATION, OR
* DISTRIBUTION OF PROGRAMS OR FILES CREATED FROM, BASED ON, AND/OR
* DERIVED FROM THIS SOURCE CODE FILE.
*/
//------------------------------------------------------------------------------
// Copyright (c) 1996-2002 Borland Software Corporation.  All Rights Reserved.
//------------------------------------------------------------------------------

//package com.borland.samples.welcome;

import java.awt.*;
import javax.swing.UIManager;

public class DiaryApp {
  boolean packFrame = false;

  // Construct the application
  public DiaryApp() {
    DiaryFrame frame = new DiaryFrame();

    //Pack frames that have useful preferred size info, e.g. from their layout
    //Validate frames that have preset sizes
    if (packFrame)
      frame.pack();
    else
      frame.validate();

    // Center the frame
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    if (frameSize.height > screenSize.height)
      frameSize.height = screenSize.height;
    if (frameSize.width > screenSize.width)
      frameSize.width = screenSize.width;
    frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);

    frame.setVisible(true);
  }

  // Main method
  static public void main(String[] args) {
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new DiaryApp();
  }
}

/**
* Copyright (c) 1996-2002 Borland Software Corporation. All Rights Reserved.
*
* This SOURCE CODE FILE, which has been provided by Borland Software as part
* of a Borland Software product for use ONLY by licensed users of the product,
* includes CONFIDENTIAL and PROPRIETARY information of Borland Software.  
*
* USE OF THIS SOFTWARE IS GOVERNED BY THE TERMS AND CONDITIONS
* OF THE LICENSE STATEMENT AND LIMITED WARRANTY FURNISHED WITH
* THE PRODUCT.
*
* IN PARTICULAR, YOU WILL INDEMNIFY AND HOLD BORLAND SOFTWARE, ITS
* RELATED COMPANIES AND ITS SUPPLIERS, HARMLESS FROM AND AGAINST ANY
* CLAIMS OR LIABILITIES ARISING OUT OF THE USE, REPRODUCTION, OR
* DISTRIBUTION OF YOUR PROGRAMS, INCLUDING ANY CLAIMS OR LIABILITIES
* ARISING OUT OF OR RESULTING FROM THE USE, MODIFICATION, OR
* DISTRIBUTION OF PROGRAMS OR FILES CREATED FROM, BASED ON, AND/OR
* DERIVED FROM THIS SOURCE CODE FILE.
*/
//------------------------------------------------------------------------------
// Copyright (c) 1996-2002 Borland Software Corporation.  All Rights Reserved.
//------------------------------------------------------------------------------

//package com.borland.samples.welcome;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class DiaryFrame extends JFrame
{
    JPanel contentPane;
    BorderLayout borderLayout1 = new BorderLayout();
    JMenuBar jMenuBar1 = new JMenuBar();

    JMenu jMenuFile = new JMenu();
    JMenuItem jMenuFileNew  = new JMenuItem();
    JMenuItem jMenuFileOpen = new JMenuItem();
    JMenuItem jMenuFileSave = new JMenuItem();
    JMenuItem jMenuFileExit = new JMenuItem();

    JMenu jMenuSearch = new JMenu();
    JMenuItem jMenuSearchUser = new JMenuItem();

    JMenu jMenuHelp = new JMenu();
    JMenuItem jMenuHelpAbout = new JMenuItem();

    // Construct the frame
    public DiaryFrame()
    {
        enableEvents(AWTEvent.WINDOW_EVENT_MASK);
        try
        {
            jbInit();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    // Component initialization
    private void jbInit() throws Exception
    {
        contentPane = (JPanel) this.getContentPane();
        contentPane.setLayout(borderLayout1);
        this.setTitle("Mini Diarybook");
        this.setJMenuBar(jMenuBar1);
        this.setSize(new Dimension(400, 300));

        jMenuFile.setText("File");
        jMenuFileNew.setText("New");
        jMenuFileNew.addActionListener(new java.awt.event.ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                jMenuFileNew_actionPerformed(e);
            }
        });
        jMenuFileOpen.setText("Open");
        jMenuFileOpen.addActionListener(new java.awt.event.ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                jMenuFileOpen_actionPerformed(e);
            }
        });
        jMenuFileSave.setText("Save");
        jMenuFileSave.addActionListener(new java.awt.event.ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                jMenuFileSave_actionPerformed(e);
            }
        });
        jMenuFileExit.setText("Exit");
        jMenuFileExit.addActionListener(new java.awt.event.ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                jMenuFileExit_actionPerformed(e);
            }
        });
        jMenuFile.add(jMenuFileNew);
        jMenuFile.add(jMenuFileOpen);
        jMenuFile.add(jMenuFileSave);
        jMenuFile.add(jMenuFileExit);

        jMenuSearch.setText("Search");
        jMenuSearchUser.setText("User");
        jMenuSearchUser.addActionListener(new java.awt.event.ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                jMenuSearchUser_actionPerformed(e);
            }
        });
        jMenuSearch.add(jMenuSearchUser);

        jMenuHelp.setText("Help");
        jMenuHelpAbout.setText("About");
        jMenuHelpAbout.addActionListener(new java.awt.event.ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                jMenuHelpAbout_actionPerformed(e);
            }
        });
        jMenuHelp.add(jMenuHelpAbout);

        jMenuBar1.add(jMenuFile);
        jMenuBar1.add(jMenuSearch);
        jMenuBar1.add(jMenuHelp);
    }

    //Overridden so we can exit when window is closed
    protected void processWindowEvent(WindowEvent e)
    {
        super.processWindowEvent(e);
        if (e.getID() == WindowEvent.WINDOW_CLOSING)
        {
            System.exit(0);
        }
    }

    public void jMenuFileNew_actionPerformed(ActionEvent e)
    {
    }

    public void jMenuFileOpen_actionPerformed(ActionEvent e)
    {
    }

    public void jMenuFileSave_actionPerformed(ActionEvent e)
    {
    }

    //File | Exit action performed
    public void jMenuFileExit_actionPerformed(ActionEvent e)
    {
        System.exit(0);
    }

    public void jMenuSearchUser_actionPerformed(ActionEvent e)
    {
    }

    //Help | About action performed
    public void jMenuHelpAbout_actionPerformed(ActionEvent e)
    {
    }
}