Tài liệu About Java and xBaseJ- P9 docx

... #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 ... Yourassignments will require you to create new conditions in this structure.  Once we identify whichmenu option was chosen based upon the text of its action we need to either launch the associateddialog or shuffle the correct panel to the top.  We need the name each panel was added with inorder to find it with the show() method.testMegaXbase .java 1) import java. awt.*;2) import java. awt.event.*;3) import javax.swing.*;4) import javax.swing.plaf.*;5)6) import com.logikal.megazillxBaseJ.*;7)8) ...  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....

... 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...

... 102StatElms .java 106StatDBF .java 107MegaXDueElms .java 112 113DueSortCompare .java 1142.3 The Panels 115 MegaXbaseDuePanel .java 115MegaXbaseBrowsePanel .java 124MegaXbaseEntryPanel .java 1282.4 The ... rollie1 .java 39 rollie1 .java 39 48testRollie1 .java 491.6 Programming Assignment 1 49 1.7 Size Matters 49 example5 .java 491.8 Programming Assignment 2 51 1.9 Examining a DBF 51 showMe .java ... 1.11 Descending Indexes and Index Lifespan 62 doeHistory .java 63testDoeHistory .java 761.12 Programming Assignment 4 82 1.13 Deleting and Packing 83 testpackDoeHistory .java 841.14 Programming...

... HHHHHHaaaaaandlindlindlindlindlindlinnnnnng and Example 1g and Example 1g and Example 1g and Example 1g and Example 1g and Example 1I will assume you are familiar enough with Java to know that statements ... $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...

... aDB.findNext();71Chapter 1 ­ Fundamentals1.111.111.111.111.111.11      Descending Indexes and Index LifespanDescending Indexes and Index LifespanDescending Indexes and Index LifespanDescending Indexes and Index LifespanDescending Indexes and Index LifespanDescending Indexes and Index LifespanYou have already seen how indexes can be useful when it comes to keeping data in a sortedorder.  Even if the data isn't physically sorted, the index allows you to retrieve it in the order youwant.  ... testShowMeThis is one of the longer test programs I have provided you.  A big part of that is due to thefact I created a CSV (Comma Separated Value) file called fuel_prices.csv which has lines in itlooking like this:80Chapter 1 ­ Fundamentalsroland@logikaldesktop:~/fuelsurcharge2$ source ./env1 roland@logikaldesktop:~/fuelsurcharge2$ javac showMe .java jroland@logikaldesktop:~/fuelsurcharge2$ javac testShowMe .java roland@logikaldesktop:~/fuelsurcharge2$ ... 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 3 T Records 2 and...

... 03.50082Chapter 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 ...  those records, then attempt to add threerecords which have the same primary key value.What happens?If you manage to get the records added, what happens when you attempt to reIndex()?How about when you try to undelete?91Chapter 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 ...  If you do not re­index your index files or create new index files after callingpack(), then you are asking for disaster.85Chapter 2 – Mega­Zillionaire ApplicationFigure 6 Entry form with Nimrod look and feelFigure 7 FileChooser with Nimrod look and feelYou might notice that it isn't only the coloring which changes, but the layout and style ofthings.  The common Java tools like FileChooser also are dramatically different.  Not all Look and Feels are available for all versions of Java. 100Chapter 1 – FundamentalsResult...

... 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?  ...  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? ...

... /*;;;;;136Chapter 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) ...  thepreferred size so the date column would display completely without requiring a user to manuallyresize it.We actually never call the updateText() method.  That is just a method I carry around frompanel class to panel class.MegaXbaseEntryPanel .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)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”...

...  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)...

... Democracy Is . . . And Is Not,”Journal of Democracy, summer 75–88.Shleifer, Andrei and Vishny, Robert W. (1993). “Corruption,” Quarterly Journal of Economics108: 599–617.Sirowy, Larry and Inkeles, ... traditional and accepted position is that corruption hasfew virtues: it renders otherwise good government bad and bad governmentworse, it dissipates resources that could be used productively, and generates ... aDRURY/KRIECKHAUS/LUSZTIG: Corruption, Democracy, and Economic Growth 123“high government officials are likely to demand special payments” and “illegalpayments are generally expected throughout...