About Java and xBaseJ- P4

... ----------- JAVA5 01 JAVA And Abstract Algebra 120120120 NNYNYNN 0930 6 F JAVA1 0200 Intermediate JAVA 300020000 NYNYNYN 0930 3 T JAVA1 0100 Introduction to JAVA 120120120 NYNYNYN 0800 3 T Records 2 and ... Descending Indexes and Index Lifespan Descending Indexes and Index LifespanDescending Indexes and Index Lifespan Descending Indexes and Index LifespanDescending Indexes and Index Lifespan Descending Indexes and Index Lifespan ... roland@logikaldesktop:~/fuelsurcharge2$ javac showMe .java jroland@logikaldesktop:~/fuelsurcharge2$ javac testShowMe .java roland@logikaldesktop:~/fuelsurcharge2$ java testShowMe class.dbf has: 3 records 7...

...  Icheated here and directly created a database object because I had not added a pack_database()method to the doeHistory class.87Chapter 1 ­ FundamentalsYou will notice at listing lines 53 through 57 that I chose to add some more records.  I justwanted to make things painfully obvious during the rest of the test.  There is nothing really magic about the values in those records, other than the fact they are easy to spot.Pay special attention to listing line 82.  Do you remember what I said earlier?  I deliberatelyleft this line where it was to prove that statement.  Now, let's take a look at the output.roland@logikaldesktop:~/fuelsurcharge2$ javac doeHistory .java roland@logikaldesktop:~/fuelsurcharge2$ javac testpackDoeHistory .java roland@logikaldesktop:~/fuelsurcharge2$ java testpackDoeHistory ...  uses thereadPrev() method of the DBF class to read the previous record.  Clone the dump_first_10_k1()method you just moved to testDoeHistory .java to a method named dump_last_10_k0().  Withoutusing the alternate index, get the same 10 records to display.84Chapter 1 – Fundamentals1.131.131.131.131.131.13      Deleting and PackingDeleting and PackingDeleting and PackingDeleting and PackingDeleting and PackingDeleting and PackingI mentioned much of this information earlier but we are going to go over it again in detailbecause it tends to catch most newbies off­guard even after they have been told a hundred times.Deleting a record in an xBASE file does not physically delete the record (in most versions), nordoes ... incredibly ugly   MetalLook and Feel which is the default Java Look and Feel.  In case you are wondering, this is the FileChooser   displayed   when   a   Motif­based   Look   and   Feel   has   been...

...  I have notprovided a screen shot of this report, but we will discuss its logic anyway.2.32.32.32.32.32.3The PanelsThe PanelsThe PanelsThe PanelsThe PanelsThe PanelsMegaXbaseDuePanel .java 1) package com.logikal.megazillxBaseJ;2)3)4) import java. awt.*;5) import java. awt.event.*;6) import javax.swing.*;7) import java. util.*;8) import java. text.*;9) import java. lang.Integer;10)11) ... classYou didn't really think I was going to let you off with only one rant about the shortcomings ofOOP, did you?  I must admit that in Java 1.6 things got a bit better, but you can't simply code in Java 1.6 since Java 1.4 is still the most widely used in the field.  Because of that, I had to extendthe ...  Inc. really needs to get into thispersonal file server market.  There are probably still a lot of tools out there which support Btrieve and let end users create things by picking and pointing.Memory and bandwidth issues simply cannot be overlooked when designing an application.  Iprovided only a few hundred records for our test database and I'm creating the files locally.  Whathappens when you modify this application to open a DBF and NDX which are on a Web site orremote file server?  Unless you are on dial­up, you probably have enough bandwidth to transferfewer than 400 records.  How about when the file is approaching 2GB and the end user is on asatellite connection with a 120MB per day bandwidth restriction? ...

...  at, the Due report isn't all thatcomplex.  I've already shown you how to create similar reports to the screen using xBaseJ and DBF files.  All you had to learn here was how to create a panel with a text area.  Once you knewthat, you could simply walk down the databases, sort the data, and print the report.124Chapter 2 – Mega­Zillionaire ApplicationMegaXbaseBrowsePanel .java 1) package com.logikal.megazillxBaseJ;2)3) import java. io.*;4) import java. awt.*;5) import java. awt.event.*;6) import javax.swing.*;7) import java. util.*;8) import java. text.*;9)10) ... library   and   many   Java developers have begun migrating away from Swing.    When it comes to the subject of layoutmanagers and Java,  it looks like the subject was “tabled until later” and later still hasn't come.You position objects in a GridBagLayout via a GridBagConstraints object.  Ordinarily youwill fill in only the anchor and gridwidth values, leaving the rest of the GridBagConstraints fieldsat their default values.  Normally gridwidth is a numeric constant such as 1 or 2, but it can be acouple of “special” ...  thesystem is idle to update the display, or finds itself forced to update the display.  The lines of codein updateText() force the display manager to consolidate all of the updates and display them.  Thisstep does slow down processing, so you should do it only at points in time when you feel the usermust see the progress which has been made.I need to point out one tiny little thing at listing line 103.  You may not grasp why I calledtrim() after calling get().  The parseInt() static method throws exceptions if the numeric string youhand it contains spaces.  I don't know why it doesn't call trim() on its own, but it doesn't.  As youcan see by listing line 111, parseDouble() managed to handle things just fine.Listing lines 123 through 131 contain something I truly hate about Java 1.4 and earlier.  TheNumberFormat object is very primitive.  It does provide methods to set the minimum number offractional digits, and minimum number of integer digits, but it has no concept of justification, fillcharacter, or display width.  If you try to set both the integer and fraction digits for a column, itwill zero fill on the front and force the display to look something like the following....

...  We have used the Field put() method and the DBF write() method many times over inprevious source listings.MegaXbase .java 1) import java. awt.*;2) import java. awt.event.*;3) import javax.swing.*;4) import javax.swing.plaf.*;5)6) import com.sun .java. swing.plaf.windows.WindowsLookAndFeel;7) import ...  I started writing the rest of the application.There was actually a method to the madness.  If the Import function was simply another panel, itwould be possible for a user to choose a file name, then leave the screen by selecting anothermenu option.  He or she would not have actually performed the import, but might believe it wascomplete.  Making this a dialog stopped that from happening.MegaXImport .java 1) package com.logikal.megazillxBaseJ;2)3) import java. awt.*;4) import java. awt.event.*;5) import javax.swing.*;6) import javax.swing.filechooser.*;7) import java. text.*;8) ... com.sun .java. swing.plaf.windows.WindowsLookAndFeel;7) import com.sun .java. swing.plaf.gtk.GTKLookAndFeel;8) import com.sun .java. swing.plaf.motif.MotifLookAndFeel;9)10) import com.logikal.megazillxBaseJ.MegaXImport;11)...

... #15) javac -source 1.4 -target 1.4 -d . MegaXImport .java 16) javac -source 1.4 -target 1.4 -d . MegaXbaseBrowsePanel .java 17) javac -source 1.4 -target 1.4 -d . MegaXbaseEntryPanel .java 18) javac ...  In general, a VMdesigned to run on multiple platforms cannot make use of a distributed lock manager which wasintegrated into the OS kernel of one platform because the lesser platforms the VM runs on don'thave a prayer of ever having such a tool.  If you store 100% of all data in a relational databasewhich is native to the platform providing the distributed lock manager and integrated with saidmanager, and you have a message queueing system which is integrated with the distributed lockmanager, and a message dispatching system which is not only integrated with the distributed lockmanager, but will rollback and re­dispatch the message when the process handling it hangs ordies, then and only then, can you think about using a VM­based language for development.  Yes,there were a lot of ands in that sentence, and for good reason.Before you can go out working in the real world, you need to know two things:1. ... tocompile it.  The safe thing for me to do was scan through the list of Look and Feels which Java “thought”   were   installed.     Until   the   advent   of   Java   1.6   and   the   creation   of   a   file   calledswing.properties, Java had no real way of finding out about any look and feel Sun didn't provide.Traditionally, applications will include an extra JAR file containing a...

... Classes 102 MegaDBF .java 102StatElms .java 106StatDBF .java 107MegaXDueElms .java 112 113DueSortCompare .java 1142.3 The Panels 115 MegaXbaseDuePanel .java 115MegaXbaseBrowsePanel .java 124MegaXbaseEntryPanel .java ... 115MegaXbaseBrowsePanel .java 124MegaXbaseEntryPanel .java 1282.4 The Import Dialog 153 MegaXImport .java 153 157 157 157MegaXbase .java 157testMegaXbase .java 1632.5 Programming Assignment 1 164 2.6 ... ANSI/X3J19 was formed and began working on xBASEstandards. In 1994 Borland ended up selling the dBASE name and product line to dBASE Inc.The standards committee accomplished little, despite all...

... $CLASSPATH.:commons-logging-1.1.1.jar:junit.jar:xBaseJ.jar:xercesImpl.jar:/usr/lib/jvm/ java- 6-sun/*.jar:/usr/share /java/ hsqldb-1.8.0.10.jar:/usr/share /java/ hsqldb.jar:/usr/share /java/ hsqldbutil-1.8.0.10.jar:/usr/share /java/ hsqldbutil.jar:/usr/share/ java/ ItzamJava-2.1.1.jar:/usr/share /java/ jsp-api-2.0.jar:/usr/share /java/ jsp-api.jar:/usr/share /java/ LatestVersion.jar:/usr/share /java/ libintl.jar:/usr/share/ java/ mysql-5.1.6.jar:/usr/share /java/ mysql-connector -java- 5.1.6.jar:/usr/share/ java/ mysql-connector -java. jar:/usr/share /java/ mysql.jar:/usr/share /java/ QuickNotepad.jar:/usr/share /java/ servlet-api-2.4.jar:/usr/share /java/ servlet-api.jar:/usr/local/share /java/ *.jar:Chapter ... $CLASSPATH.:commons-logging-1.1.1.jar:junit.jar:xBaseJ.jar:xercesImpl.jar:/usr/lib/jvm/ java- 6-sun/*.jar:/usr/share /java/ hsqldb-1.8.0.10.jar:/usr/share /java/ hsqldb.jar:/usr/share /java/ hsqldbutil-1.8.0.10.jar:/usr/share /java/ hsqldbutil.jar:/usr/share/ java/ ItzamJava-2.1.1.jar:/usr/share /java/ jsp-api-2.0.jar:/usr/share /java/ jsp-api.jar:/usr/share /java/ LatestVersion.jar:/usr/share /java/ libintl.jar:/usr/share/ java/ mysql-5.1.6.jar:/usr/share /java/ mysql-connector -java- 5.1.6.jar:/usr/share/ java/ mysql-connector -java. jar:/usr/share /java/ mysql.jar:/usr/share /java/ QuickNotepad.jar:/usr/share /java/ servlet-api-2.4.jar:/usr/share /java/ servlet-api.jar:/usr/local/share /java/ *.jar:Chapter ... $CLASSPATH.:commons-logging-1.1.1.jar:junit.jar:xBaseJ.jar:xercesImpl.jar:/usr/lib/jvm/ java- 6-sun/*.jar:/usr/share /java/ hsqldb-1.8.0.10.jar:/usr/share /java/ hsqldb.jar:/usr/share /java/ hsqldbutil-1.8.0.10.jar:/usr/share /java/ hsqldbutil.jar:/usr/share/ java/ ItzamJava-2.1.1.jar:/usr/share /java/ jsp-api-2.0.jar:/usr/share /java/ jsp-api.jar:/usr/share /java/ LatestVersion.jar:/usr/share /java/ libintl.jar:/usr/share/ java/ mysql-5.1.6.jar:/usr/share /java/ mysql-connector -java- 5.1.6.jar:/usr/share/ java/ mysql-connector -java. jar:/usr/share /java/ mysql.jar:/usr/share /java/ QuickNotepad.jar:/usr/share /java/ servlet-api-2.4.jar:/usr/share /java/ servlet-api.jar:/usr/local/share /java/ *.jar:Chapter...

... daysMeet time cr UnderGrad JAVA5 01 JAVA And Abstract Algebra 120120120 NNYNYNN 0930 6 F JAVA1 0200 Intermediate JAVA 300020000 NYNYNYN 0930 3 T JAVA1 0100 Introduction to JAVA 120120120 NYNYNYN 0800 ... teacherId daysMeet time cr UnderGrad JAVA1 0100 Introduction to JAVA 120120120 NYNYNYN 0800 3 T JAVA1 0200 Intermediate JAVA 300020000 NYNYNYN 0930 3 T JAVA5 01 JAVA And Abstract Algebra 120120120 NNYNYNN ... daysMeet time cr UnderGrad JAVA1 0100 Introduction to JAVA 120120120 NYNYNYN 0800 3 T JAVA5 01 JAVA And Abstract Algebra 120120120 NNYNYNN 0930 6 F JAVA1 0200 Intermediate JAVA 300020000 NYNYNYN 0930...

... provided in Section 3.7, Java Servlets and JSP,” in Chapter 3, Java Servlets and JavaServer Pages: Jakarta Tomcat.”We also find Marty Hall’s book, Core Servlets and JavaServer Pages, published by Prentice ... fewexamples of host commands and guest commands.This is an obvious place to growthis application in terms of both utility and user interest. Here are just a few of themany possible candidates for addition ... understandall of them and how they relate to the other components of bonForum.If you need to learn more about JSP technology, refer to the suggestions and resources provided in Section 3.7, “Java...