Javaâ¢ Application Development on Linux - Dator

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360Chapter 16Getting in the Swing of Things: Designing a GUI for BudgetProhas most of the Table interface implemented. You only need to implementthree methods:public int getRowCount();public int getColumnCount();public Object getValueAt(int row, int column);Together, these three methods give a pretty good definition of a table: howmany rows it has, how many columns it has, and how to access the value at any(row, column) location. Notice, too, that the getValueAt() returns anObject, so you can’t return an int or float or double. You can only returnan Integer, Double, and so on. Another option is to return a String valueof the number that you want to display.Let’s take a look at how the AbstractTableModel was implemented inthe BudgetPro application. We begin at line 135, inside the createList()method. The createList() method is going to build the central portionof our GUI, the table display. In order to do that, it creates anAbstractTableModel to give to the JTable it creates on line 193. TheAbstractTableModel is defined inline as an anonymous inner class thatimplicitly extends AbstractTableModel. This section of code is listed inExample 16.2; follow along as we discuss it further.(An aside: We could also have defined this inner class elsewhere in the classfile, as a class which explicitly extends AbstractTableModel. However, aswith the icon we used in the JButton example, we have no further need of theobject other than this single use, so we didn’t bother to create it as a standaloneentity. Both ways work, and are more a matter of preference or of how familiaryou are with the inline syntax.In our implementation of the AbstractTableModel, we are going to includecolumn headings, so we begin with a definition of Strings for our columnheadings (line 137). Then the getColumnCount() method, one of thethree methods that we need to implement in this class, is simply a matter ofreturning the size of this array (line 159). Lines 139–142 override thegetColumnName() method, which isn’t one of the three that we must implement.But if we don’t, the default behavior from AbstractTableModel willreturn nulls, so we’d get no column headings. Instead, we use the columnnumber as an index to our array of column names.The getRowCount() method is almost as simple (lines 144–155).The number of rows that this table should display for any account is the
16.7 Getting Down to Cases: Designing a GUI for BudgetPro361Example 16.2 Defining our AbstractTableModel130 private Component131 createList()132 {133 JScrollPane retval;134135 model = new AbstractTableModel()136 {137 private String [] columnNames = {"Account", "Owner", "Value"};138139 public String140 getColumnName(int col) {141 return columnNames[col];142 } // getColumnName143144 public int145 getRowCount()146 {147 int retval;148149 if (current != null) {150 retval = current.size();151 } else {152 retval = 1; // testing only153 }154155 return retval;156157 } // getRowCount158159 public int getColumnCount() { return columnNames.length; }160161 public Object162 getValueAt(int row, int col) {163 Object retval = null;164 Account aa = null;165 // return "---"; // rowData[row][col];166 int count = 0;167 for (Iterator itr=current.getAllSubs(); itr.hasNext(); )168 {169 count++;170 aa = (Account) itr.next();171 if (count > row) { break; }172 } // next
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Java Application
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Java Application
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To my mother, for her love of words
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viiiContents1.41.51.6Chapter 22.12.
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xContents5.65.75.85.95.105.115.125.
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xiiContentsChapter 99.19.29.39.49.5
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xivContentsChapter 1313.113.213.313
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xviContentsChapter 1717.117.217.317
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xviiiContents20.620.720.820.920.102
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PrefaceJAVA AND LINUXWhy another bo
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PrefacexxiiiFREE SOFTWARE AND JAVAG
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Prefacexxvand Tyrrell Albaugh, who
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xxviiiIntroductionIf you are an exp
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xxxIntroductionThe Linux Newbie Pat
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Part IGetting Started
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4Chapter 1An Embarrassment of Riche
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10Chapter 1An Embarrassment of Rich
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Chapter 2An Embarrassment of Riches
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2.2 Eye to Eye with vi35of their co
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2.2 Eye to Eye with vi37• L (“l
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2.2 Eye to Eye with vi39In both cas
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2.2 Eye to Eye with vi41• :7,.w!
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2.2 Eye to Eye with vi431,$s/Tryout
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2.3 Editors Galore45affected by thi
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2.3 Editors Galore47has a huge lear
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2.6 Resources49• fte is an editor
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52Chapter 3An Experienced Programme
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100Chapter 4Where Am I? Execution C
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116Chapter 5The Sun Microsystems Ja
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168Chapter 6The IBM Developer Kit f
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Chapter 7The GNU Compiler for Java(
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7.4 Compiling Our Simple Ap
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7.4 Compiling Our Simple Ap
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7.5 Options and Switches1857.5OPTIO
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7.9 What You Still Don’t Know187o
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Chapter 8Know What You Have:CVSSour
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8.2 Source Control: Whys and Hows19
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8.3 A GUI: jCVS211and the differenc
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8.4 Review213Figure 8.7 jCVS checko
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Chapter 9Ant:An IntroductionAnt 1 i
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9.3 Obtaining and Installing Ant217
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9.3 Obtaining and Installing Ant219
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9.4 A Sample Ant Buildfile221standa
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9.4 A Sample Ant Buildfile2239.4.2.
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9.4 A Sample Ant Buildfile225$ antB
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9.4 A Sample Ant Buildfile227debugI
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9.4 A Sample Ant Buildfile229Exampl
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9.4 A Sample Ant Buildfile231Runnin
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9.7 Resources233• O’Reilly has
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236Chapter 10Integrated Dev
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Chapter 11Balancing Acts:An Imagina
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11.3 How to Develop Software265soft
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11.4 What Makes a Good Requirement2
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11.6 Requirements for the Budget <s
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11.6 Requirements for the Budget <s
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11.7 Documenting, Prototyping, and
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11.7 Documenting, Prototyping, and
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11.11 Exercises277• http://www.pr
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Chapter 12Analysis and Design:Seeki
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12.4 Finding the Objects281Accounta
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12.5 Finding the Methods and Attrib
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12.6 Essential and Nonessential285
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12.7 Analysis Paralysis287• Class
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12.12 Resources28912.9CORE CLASSESS
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12.12 Resources291if (dbConn != nul
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12.13 Exercises293Example 12.2 The
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296Chapter 13JUnit: Automating Unit
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Page 351 and 352: 14.7 Beyond the Basics319files, and
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Page 363 and 364: 15.3 Making Connections331Example 1
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410Chapter 18Servlets: Java Pressed
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Chapter 19JSP:Servlets Turned Insid
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19.2 Servlets Turned Inside Out: JS
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19.3 How to Write a JSP App
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19.5 Review439into JSP files. The m
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19.8 Exercises441To get it straight
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444Chapter 20Open Source Web <stron
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Part VDevelopingEnterprise Scale So
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474Chapter 21Introduction to Enterp
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494Chapter 22Building an EJBclasses
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496Chapter 22Building an EJBwhich,
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498Chapter 22Building an EJBExample
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500Chapter 22Building an EJBExample
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502Chapter 22Building an EJBIf you
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Chapter 23Deploying EJBsIn this cha
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23.2 Lend Me Your EAR: Enterprise P
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23.3 Deploying the EAR515automatic
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23.4 Maintaining a Distributed <str
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23.8 Resources519Ant and CVS and ho
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522Chapter 24Parting ShotsThe three
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524Chapter 24Parting ShotsPrentice
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526Appendix AASCII ChartInt Oct Hex
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528Appendix BA Java Swing GUI for B
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Appendix CGNUGeneral Public License
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C.2 Terms and Conditions for Copyin
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C.2 Terms and Conditions for Copyin
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C.3 NO WARRANTY545of this License,
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C.5 How to Apply These Terms to You
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550Index$ (dollar)in format fields,
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552Indexbreak statement, 67, 74-75b
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554IndexCVS_RSH environment variabl
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556IndexFfail(), 307false constant,
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558IndexIBM, 236, 377, 518Common Pu
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560IndexJNDI (Java Naming and Direc
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562IndexNetBeans (continued)running
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564IndexScrollBar class, 385search
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566IndexTable class, 386, 394-395ta
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